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Fukushima’s nuclear waste problems piling up

waste acres FukushimaProblems Keep Piling Up in Fukushima Steve Herman  VOA News 17 Feb 16 TOKYO—

Experts say Japan’s nuclear energy problems are worsening, five years after a massive earthquake unleashed a tsunami that melted down the island nation’s nuclear reactors.

Nine million cubic meters of radioactive waste, much of it soil, are stored unsheltered in black bags throughout Fukushima prefecture, preventing tens of thousands of residents from returning home.

And the problem is going to worsen before it improves.

An estimated 13 million cubic meters of toxic soil is yet to be collected and technicians have yet to solve the contamination issue inside the Fukushima-1 Nuclear Power Plant. Government and industry officials acknowledge cleaning everything up — including decommissioning the crippled reactors — will take at least another 40 years and cost as much as $250 billion.

And that timeline and the costs – considered overly optimistic by some industry experts – are based on nothing major going wrong. If another major earthquake hits and results in a tsunami, there will be major setbacks, admits the nuclear plant’s manager, Akira Ono.

Thousands of workers are dedicated to keeping under control the plant’s six reactors, four of which either melted down or were severely damaged.

Japan has never decommissioned a nuclear reactor, much less reactors as damaged as those at Fukushima.

It has resisted offers from foreign companies to help formulate an adequate cleanup plan.

“Unfortunately the cleanup effort continues to suffer from an inability to face the long-term decisions that have to be made in order to develop and implement an efficient plan,” said former U.S. diplomat Kevin Maher, who was running the State Department’s Japan desk when the earthquake struck.

The cleanup plan, he argues, should be driven by where to ultimately dispose the contaminated debris, fuel and water.

“Instead, Tokyo Electric Power Company (TEPCO) continues to delay those decision, so we see the continual buildup of more stored water, because TEPCO can’t decide what to do with it. An experienced program management company could make those decisions,” said Maher, a senior advisor at NMV Consulting in Washington.

Even if Fukushima residents with homes inside the exclusion zone are allowed to return, the thousands of bags of radioactive soil in the prefecture may give them pause……..

The question of whether Fukushima can ever be adequately decontaminated is also an open one.

Japan’s environment minister has had to walk back remarks she made about the government’s decontamination target.

Tamayo Marukawa last Friday apologized for saying the government aimed to reduce the radiation level near the Fukushima-1 plant to an annual dose of one millisievert or less, a goal that has no scientific basis. (The average yearly human dose globally from naturally occurring sources is about three times that amount, according to scientists.)……..http://www.voanews.com/content/problems-keep-piling-up-in-fukushima/3194401.html

February 19, 2016 Posted by | Fukushima 2016 | Leave a comment

Something is wrong here

By Fonzy (6th testimony)

I hesitated longtime to mention the following anecdote, because I do not want to talk about the false informations or hoaxes that often are told just to scare people. Also I am lacking there statistics or precise data. However, I now tell myself it’s time to talk, especially to make known to those who live far away and do not know what happens here every day. In short, it is the increasing number of the so-called “urgent sick” on public transports.

What is an “urgent sick”? It is someone who had a pretty severe discomfort or fainted on the train.
Indeed, for at least a year or two. transportation is often disturbed in Tokyo because of “an urgent sick” rescue,
Japanese trains have long had a reputation for being punctual. Alas, it was the Japan of yesteryear.
Now, there are daily trains that are late because of unplanned stops to take care of the sick.I quote the tweets of @ Charley charleycharley7 that counts the number of people who tweet “urgent sick” in the Kanto, Chubu and Tohoku regions (Eastern Japan).

The total number of tweets “urgent sick ” | daily average
2015
mi-February                            209                             13,9
March                                    497                             16,0
April                                     671                             22,3
May                                      668                             21,5
June                                      725                             24,1
July                                   724                             23,3
August                                     664                             21,4
September                            730                             24,3
October                                855                             27,5
November                            843                             28,1
December                            921                             29,7
2016
January                                872                             28,1

These are not official data. Finally, these are just tweets. Everyone does not tweet soon as he finds an urgent sick on the train. It is therefore possible that the same patient was tweeted by several people. Still, it’s serious to me. Now there are some who think that eight hundred is not a significant figure given the total population of the regions. However, I say this is significant because I had never heard of “urgent sick” in my life. It’s been thirty years that I travel by train to Tokyo, but only since last year or the year before that I hear on the train often enough as an announcement
‘We are sorry that our train is delayed because of an urgent sick’ .I also add that there are many people who share my opinion.

ob_e64dcf_annonce

I recently saw a man of about sixty years who was lying on the dock. He was not unconscious, but required aid to an employee of the station, the hand on the chest.
It was the Shin-Osaka station, about 800 km from the Fukushima Daiichi plant.
Yes, there are also cases in Western Japan. According Charley @ charleycharley7 on 1 February 2016, there were twenty to five tweets of the urgent sick in the East, against only eight in the West. It’s very little, but it exists.
Otherwise, as we see from time to time there are those who sleep like a log on a bench, on a platform or on the ground. I hear the siren of the ambulance every day, even every three or four hours .We have had since the beginning of the year four or five bus drivers who lost consciousness (one causing a serious accident that killed 15 people). This is not normal, but now the abnormal becomes almost normal here, although no evidence is linking this to radiation …

Update 16 February 2016

Adding a screenshot of tweet

Translation: “Around me there are more and more people who die or are ailing But it seems that on the train also now there are many.” Urgent sick “, here is the graph of the number of people had discomfort on trains in 2015. “

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Comment

Reading this new testimony of Fanny, I remembered that I had written on the subject of health in late 2011 an item, “The effects of the Fukushima disaster on health.” At that time, I was surprised by statistical data on the evolution of three infectious diseases, pneumonia (Mycoplasma Pneumonia), acute hemorrhagic conjunctivitis and the diseases of hand-foot-mouth.

So I looked again the graphics provided by the Infectious Disease Surveillance Center (Infectious Desease suveillance Center (IDSC), dependent on the National Institute of Infectious Diseases (National Institute of Infectious Diseases (NIID)), based in Tokyo .
http://idsc.nih.go.jp/idwr/kanja/weeklygraph/index-e.html
The site still exists, I will again distribute these graphs, updated in 2012, only to realize that, of the three infectious diseases which had increased in 2011, two remained of concern because of the increase in 2012. Another pneumonia, Chlamydia pneumonia was also up in 2012.

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Hemorrhagic acute conjunctivitis in red: back to normal in 2012

4

Hand, foot and mouth diseases in 2012 in red: the value exceeds before 2011

5

Pneumoniae (Chlamydia Pneumonia): increase in 2012

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Pneumoniae (Mycoplasma Pneumonia): strong increase in 2012

Finally, I noticed another infectious disease that had not progressed in the right direction in 2012, is infection with respiratory syncytial virus (RSV).

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Infections by respiratory syncytial virus: increase in 2012

Data for 2013, 2014 and 2015 are also available on another page of the site, harder to find, and this time only in Japanese. From the Infectious disease whose evolution was worrying in 2011 or 2012, remain today only of concern the hand-foot-mouth diseases with higher rates in 2013 and 2015 than in 2011, and the infections caused by respiratory syncytial virus

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Hand, foot and mouth diseases: a new significant increase in 2015

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Infections by respiratory syncytial virus: increase in 2014 and 2015

.

With the return to the normal average of hemorrhagic acute conjunctivitis and pneumonia, we would have liked to see a general improvement but two other infectious diseases now have a worrying development, exceeding the rate of the last 10 years: streptococcal pharyngitis and the fifth disease (the Erythema Infectiosum.).

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Strep throat infections ( streptococcal pharyngitis),

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Fifth disease (Erythema Infectiosum Infections),

Is there a link between the actual contamination, even at low doses, and the weakening of the immune system of the Japanese, especially children? These graphics alone can not prove it. However, they do not reflect a healthier population since 2011. This is also what led a doctor from Tokyo to relocate and encourage patients to live in western Japan.
http://www.save-children-from-radiation.org/2014/07/16/a-tokyo-doctor-who-has-moved-to-western-japan-urges-fellow-doctors-to-promote-radiation-protection-a-message-from-dr-mita-to-his-colleagues-in-kodaira-city-t/
Furthermore, in Fukushima Prefecture was detected an increase of about 30 times the number of thyroid cancer among young people aged 18 and under in 2011. This increase is not normal, as confirmed the Japanese epidemiologist, Professor Toshihide TSUDA University of Okayama.

Pierre Fetet

Source: Fukushima Blog
http://www.fukushima-blog.com/2016/02/ici-ca-ne-va-plus.html

Translation Hervé Courtois (D’un Renard)

February 16, 2016 Posted by | Fukushima 2016 | , | Leave a comment

NRA AFTER 5 DAYS CHANGES ITS DECISION

feb 15 2016

On the February 11th the NRA for safety reasons said no to Tepco starting the freezing of its Fukushima Daiichi ice wall, now 4 days later on February 15th the NRA says yes.
How could Japan Nuclear Regulation Authority change its mind that way so rapidly about a matter regarding safety…..

NRA to allow part of frozen soil wall at Fukushima plant
The nation’s nuclear watchdog decided that Tokyo Electric Power Co. can start freezing soil in a limited area around crippled reactor buildings at the Fukushima No. 1 nuclear power plant to prevent radioactive water accumulating in the buildings from leaking into the ground.
The conditional permission by the Nuclear Regulation Authority on Feb. 15 means TEPCO will get the go-ahead for a section of frozen soil wall in the area of the complex facing the sea.
Initial plans called for TEPCO to surround the four reactor buildings with a 1,500-meter-long circular frozen soil wall by inserting 1,568 pipes to a depth of 30 meters at 1-meter intervals. Each pipe would then freeze the soil around it once liquid of minus 30 degrees circulated inside the cylinder.
Building the wall was intended to prevent the flow of groundwater into the reactor buildings, where melted nuclear fuel has accumulated in the basements, thereby reducing the volume of water contaminated with radioactive substances.
TEPCO completed the installation of the pipes on Feb. 9.
However, the NRA was worried that the level of groundwater inside the frozen soil wall could drop drastically once the frozen soil wall surrounds the reactor buildings, causing levels of highly contaminated water in the reactor buildings to become higher than the groundwater level. That, NRA officials feared, would cause the highly contaminated water to leak into the ground.
With caution the buzzword of the day, the NRA had called on TEPCO to change plans and operate only a part of the frozen soil wall.
In a meeting held Feb. 15, the utility said it would freeze only the soil on the side of the stricken facility facing the sea.
Once the NRA grants official approval, TEPCO will move quickly to freeze the soil.
TEPCO also said that it wants to freeze the remaining portions in a step-by-step manner. The NRA supported the proposal, saying it would make it possible to “collect data on water levels.”
However, the two sides did not reach any agreement on this other than to continue their discussions.

February 15, 2016 Posted by | Fukushima 2016 | , | 1 Comment

NRA decided to reduce 70 percent of radiation monitoring posts in Fukushima

NRA-decided-to-reduce-70-percent-of-radiation-monitoring-posts-in-Fukushima-800x500_c.png

THEY REALLY THINK THAT WE’RE STUPID, EVEN IF IT IS AT THE EXPENSE OF THE JAPANESE PEOPLE
On February 10, 2016 The NRA (Nuclear Regulation Authority) declared that from April 2017 it will discontinue 2500 of its 3600 radioactivity monitoring terminals in the Fukushima Prefecture.
The NRA says it’s due to lack of budget and resources.
The 2500 to be removed terminals are located in public institutions including schools.
The NRA states that there has been no significant change in radioactivity recently detected.
While all radioactivity measurements have been increasing in the Fukushima Daiichi Nuclear plant, how can someone responsible says that there is no significant change?

On 2/10/2016, NRA (Nuclear Regulation Authority) announced they are going to abandon 2,500 of 3,600 radiation monitoring posts in Fukushima prefecture from April of 2017.
NRA states this is due to the limited resource such as budget and equipment.
2,500 posts to be removed are situated in public facility including schools.
NRA comments no significant change has been detected recently. However, the monitoring posts were also observed to become “under maintenance” occasionally.

Sources

https://www.nsr.go.jp/disclosure/committee/kisei/00000110.html

NRA decided to reduce 70 percent of radiation monitoring posts in Fukushima

February 14, 2016 Posted by | Fukushima 2016 | , | 1 Comment

Little progress made in securing land for interim storage facilities for radioactive soil

hlkllmm.jpgWith thousands of bags of radioactive soil piling up, less than 1 percent of the land needed for interim storage facilities in Fukushima Prefecture has been acquired even a year after the project started.
The mountain of paperwork in finalizing the real estate transactions and insufficient manpower are the main factors behind the slow progress.
That, in turn, could affect plans to have Fukushima residents return to their homes after evacuation orders are lifted.
Because the interim storage facilities have not yet been completed, thousands of bags of contaminated soil are stacked up in the open in parts of Fukushima. Until those bags are moved to the interim storage facilities, local residents may not be willing to return because of the high radiation levels being emitted from the contaminated soil.
The Environment Ministry and local governments in Fukushima Prefecture are continuing with work to remove soil contaminated with radioactive materials. As of the end of September 2015, a total of about 9 million cubic meters of such contaminated waste were being temporarily stored in about 115,000 locations around Fukushima. Government officials estimate that a total of 22 million cubic meters of contaminated soil will eventually be collected.
That soil will all be moved to the interim storage facilities to be constructed in the Fukushima towns of Okuma and Futaba where the Fukushima No. 1 nuclear power plant is located. Total land of about 16 square kilometers will be acquired for the interim storage facilities.
Plans call for leaving the contaminated soil at the interim facilities for a maximum of 30 years before processing it somewhere outside of Fukushima Prefecture.
Land registration records contain the names of 2,365 individuals as owners of the land and buildings where the interim storage facilities will be constructed. However, as of the end of January, Environment Ministry officials have signed contracts with 44 landowners, or just 2 percent of the total. In terms of land, those contracts only covered about 0.15 square kilometer, which does not even total 1 percent of the total land that needs to be acquired.
Environment Ministry officials are trying to push ahead with appraising the land, but they face a mountain of problems as well as other issues unique to the Fukushima situation. In terms of land, about 10 percent is owned by individuals whom ministry officials have been unable to contact.
But in terms of the names on the land records, ministry officials have been unable to contact about 990 individuals, or about 40 percent of the total. Some of the people on the land records may be deceased, meaning that those with inheritance claims could run into the thousands.
Moreover, the lack of land appraisers with background about the Fukushima situation has meant that negotiations often have taken longer than expected. Some landowners also are hesitant about selling off land that has been in the family for generations, even if there are no prospects of returning to the family plot anytime soon because of the high radiation levels in the community.
In March 2015, the Environment Ministry began a trial project by leasing some of the projected land for the interim storage facilities and transporting in contaminated soil. Over 11 months, about 36,000 cubic meters of soil were hauled there, but that only represents about 0.2 percent of the expected total.
Environment Ministry officials are unable to put together a specific plan for full-scale transporting of the contaminated soil to the interim storage facilities because in fiscal 2016 only about 1 percent of the total land needed for the interim storage facilities will likely be acquired.
http://ajw.asahi.com/article/0311disaster/fukushima/AJ201602140022

February 14, 2016 Posted by | Fukushima 2016 | | Leave a comment

Radioactive Cs in the estuary sediments near Fukushima Daiichi Nuclear Power Plant

Cs-137 of estuary sediment impacted by the FDNPP was measured.
Physical and chemical properties were measured also.
Increasing radioactivity was observed from surface to bottom.
90% of the Cs-137 was strongly bound to clay minerals in the estuary sediments.
Cesium-137 is being transported from contaminated paddy fields to the estuary.
The migration and dispersion of radioactive Cs (mainly 134Cs and 137Cs) are of critical concern in the area surrounding the Fukushima Daiichi Nuclear Power Plant (FDNPP). Considerable uncertainty remains in understanding the properties and dynamics of radioactive Cs transport by surface water, particularly during rainfall-induced flood events to the ocean. Physical and chemical properties of unique estuary sediments, collected from the Kuma River, 4.0 km south of the FDNPP, were quantified in this study. These were deposited after storm events and now occur as dried platy sediments on beach sand. The platy sediments exhibit median particle sizes ranging from 28 to 32 μm. There is increasing radioactivity towards the bottom of the layers deposited; approximately 28 and 38 Bq g− 1 in the upper and lower layers, respectively. The difference in the radioactivity is attributed to a larger number of particles associated with radioactive Cs in the lower part of the section, suggesting that radioactive Cs in the suspended soils transported by surface water has decreased over time.
Sequential chemical extractions showed that ~ 90% of 137Cs was strongly bound to the residual fraction in the estuary samples, whereas 60 ~ 80% of 137Cs was bound to clays in the six paddy soils. This high concentration in the residual fraction facilitates ease of transport of clay and silt size particles through the river system. Estuary sediments consist of particles < 100 μm. Radioactive Cs desorption experiments using the estuary samples in artificial seawater revealed that 3.4 ± 0.6% of 137Cs was desorbed within 8 h. More than 96% of 137Cs remained strongly bound to clays. Hence, particle size is a key factor that determines the travel time and distance during the dispersion of 137Cs in the ocean.
http://www.sciencedirect.com/science/article/pii/S0048969716301541

February 13, 2016 Posted by | Fukushima 2016 | | Leave a comment

Arnie Gundersen Speaking Tour in Japan N°1

On The Road Again…Japan Speaking Tour Series No. 1

Fairewinds’ Chief Engineer Arnie Gundersen is hitting the road yet again for his third speaking tour of Japan! It will be five years in March since the triple meltdown at Fukushima Daiichi began and the Japanese public continues to search for the truth about nuclear risk and honest answers to their energy future as they face their current government’s push to restart Japan’s atomic reactors. By invitation from various organizations and public interest groups, Arnie will be presenting to communities throughout Japan including those who live in the shadow of atomic reactors, plutonium reprocessing plants, and proposed atomic waste dumps. Join the Fairewinds Crew as we explore some of the key issues that will be discussed during the tour.

http://www.fairewinds.org/podcast//on-the-road-againjapan-speaking-tour-series-no-1

February 13, 2016 Posted by | Fukushima 2016 | , | Leave a comment

More than 1,100 water storage tanks at Fukushima plant … and counting

feb 2016

OKUMA, Fukushima Prefecture–From the air, the rows of different colored water storage tanks at the crippled Fukushima No. 1 nuclear power plant resemble a giant integrated circuit board.
As the fifth anniversary approaches of the earthquake and tsunami disaster that unleashed the nuclear catastrophe, the stricken facility is fast running out of space to position the tanks holding highly contaminated radioactive water.
As of Feb. 12, there were 1,106 massive water tanks on the premises.
Tokyo Electric Power Co., operator of the plant, constructed the tanks to store radiation-contaminated water that has been accumulating at the plant since the disaster unfolded in March 2011.
The utility plans to construct 20 more water storage tanks to accommodate 30,000 tons of water that is expected to be generated in the remaining months of 2016.
As the tanks occupy much of the parking lots, green spaces and vacant areas, TEPCO has no choice but to build new tanks in the narrow alleys between the huge containers.
The accumulation of contaminated water has been a persistent problem at the plant, which is only in the very early stages of decommissioning, a process that will take 30 to 40 years.
http://ajw.asahi.com/article/0311disaster/fukushima/AJ201602130025

February 13, 2016 Posted by | Fukushima 2016 | , | 5 Comments

Environment minister withdraws radiation remark, apologizes to Fukushima residents

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Environment Minister Tamayo Marukawa retracted her remark about the government having “no scientific grounds” for its radiation decontamination target in the Fukushima nuclear disaster, saying she wanted to rebuild trust with local residents.
As the minister in charge of overseeing the decontamination efforts in Fukushima Prefecture, Marukawa, 45, said Feb. 12 she wants to “sincerely apologize to residents in Fukushima.”
During a speech in Matsumoto, Nagano Prefecture, on Feb. 7, she labeled the government’s long-term goal of reducing radiation levels near the crippled Fukushima No. 1 nuclear plant to an annual dose of 1 millisievert or less as having “absolutely no scientific grounds.”
A local newspaper, The Shinano Mainichi Shimbun, picked up the story and reported her comments on Feb. 8, which she promptly denied having made.
At Diet sessions on Feb. 9 and 10, Marukawa stated that she had “no recollection of using such wording” in the speech.
Nevertheless, she told the news conference on the evening of Feb. 12 that she had decided of her own volition to “retract the remark in order to maintain a relationship of trust with residents in Fukushima.”
Marukawa went on to say that the government’s decontamination target is “indeed scientific in the sense that it was set as a result of thorough discussions by scientists.”
Her acknowledgment of making the faux pas will likely prompt the opposition camp to go on the offensive during Diet sessions in the coming week. For the time being, at least, Marukawa is standing firm. She said she has no intention of stepping down and wants to continue fulfilling her duties.
The decontamination goal was set by the Democratic Party of Japan-led government of the time on the basis of recommendations by the International Commission on Radiological Protection in the aftermath of the triple meltdown at the Fukushima plant triggered by the 2011 earthquake and tsunami disaster.
After the newspaper covered her remarks, Marukawa told reporters on Feb. 8 that she did not remember using such wording as “scientifically ungrounded.” She repeated the plea at Lower House Budget Committee sessions on Feb. 9 and 10.
During a regular news conference after the Feb. 12 morning Cabinet meeting, the minister finally acknowledged the possibility of making the remark.
She eventually retracted the comment later the day after obtaining a memorandum of her speech and confirming the content with attendants.
http://ajw.asahi.com/article/behind_news/politics/AJ201602130023

February 13, 2016 Posted by | Fukushima 2016 | | Leave a comment

Fukushima nuclear station area has drastic mass death of species

insect-Fukushima-13“Mass death” of species found around Fukushima nuclear plant — Gov’t: They “seem to have disappeared… Little or no reproductive success… It is evident biota around the power plant has been affected since the nuclear accident”http://enenews.com/mass-death-species-found-around-fukushima-nuclear-plant-govt-disappeared-little-reproductive-success-evident-biota-around-power-plant-affected-nuclear-accident?utm_source=feedburner&utm_medium=email&utm_campaign=Feed%3A+ENENews+%28Energy+News%29

Yomiuri Shimbun, Feb 7, 2016 (emphasis added): The National Institute for Environmental Studies (NIES) revealed that the total number of sessile species, such as barnacles and snails, has been decreasing significantly along the coast within 10 kilometers south of the Fukushima No. 1 nuclear power plant… [T]here is the possibility that the mass death of sessile specieswas influenced by radioactive materials released into the sea…

National Institute for Environmental Studies, Feb 2016 (underlining by NIES): NIES has conducted field surveys in the intertidal zones of eastern Japan to investigate the ecological effects of the serious accident at the Fukushima Daiichi Nuclear Power Plant… The number of intertidal species decreased significantly with decreasing distance from the power plant… no rock shell (Thais clavigera) specimens were collected near the plant, from Hirono to Futaba Beach (a distance of approximately 30 km) in 2012. The collection of rock shell specimens at many other sites hit by the tsunami suggests that the absence of rock shells around the plant in 2012 might have been caused by the nuclear accident in 2011.  Quantitative surveys in 2013 showed that the number of species and population densities in the intertidal zones were much lower at sites near, or within several kilometers south of, the plant than at other sites… especially in the case of Arthropoda (e.g., barnacles). There is no clear explanation for these findings, butit is evident that the intertidal biota around the power plant has been affected since the nuclear accident…

Study funded by the Government of Japan, Feb 2016: Surveys in 2012… The number of intertidal species decreased significantly with decreasing distance from the power plant… The three animal species… 1 km south of FDNPP, were a barnacle… and two herbivorous snails… The sizes… were very small [and] densities were very low… No rock shell (Thais clavigera) specimens were found at 8 of the 10 sites in Fukushima Prefecture within a radius of 20 km of FDNPP… the area without rock shells extended… approximately 30 km… Surveys in 2013… Population densities of sessile organisms at Tomioka fishing port and Okuma were less than one-tenth to about one-fourth those at other sites… The total wet-weights in each intertidal zone at Okuma were much lower than those at other sites… it is unlikely that the absence of rock shells around FDNPP was caused only by the tsunami. The absence of rock shells at sites close to FDNPP… suggests that reproduction and recruitment did not occur there, or were less successful… [I]t is still unknown why adult rock shells living there disappeared or why rock shells had little or no reproductive success there… [I]t is also notable that barnacles seem to have disappeared from Kuboyaji, north of FDNPP…

See also: UPI: ‘Shellfish gone near damaged nuke plant’ — Researcher: Likely extinct because of Fukushima nuclear crisis

February 12, 2016 Posted by | environment, Fukushima 2016, Japan | 1 Comment

What is to be done with all Fukushima’s radioactive trash?

Fukushima-Daiichi-Contaminated-Water-Tanks-July-2015Five years after nuclear meltdown, no one knows what to do with Fukushima, SMH, Anna Fifield February 11, 2016  Futaba:  Seen from the road below, the Fukushima Dai-ichi nuclear power station looks much as it may have right after the catastrophic earthquake and tsunami that caused a triple meltdown here almost five years ago.

The No. 3 reactor building, which exploded in a hydrogen fireball during the disaster, remains a tangle of broken concrete and twisted metal. A smashed crane sits exactly where it was on March 11, 2011. To the side of the reactor units, a building that once housed boilers stands open to the shore, its rusted, warped tanks exposed.

The scene is a testament to the chaos that was unleashed when the tsunami engulfed these buildings, triggering the world’s worst nuclear disaster since the one in Chernobyl, in Ukraine, in 1986. Almost 16,000 people were killed along Japan’s northeastern coast in the tsunami, and 160,000 more lost their homes and livelihoods……..

What is to be done with all the radioactive material?

There’s the groundwater that is flowing into the reactor buildings, where it becomes contaminated. It has been treated – Tepco says it can remove 62 nuclides from the water, including strontium, which can burrow into bones and irradiate tissue. It cannot filter out tritium, a radioactive isotope of hydrogen that can be used to make nuclear bombs but is not considered especially harmful to humans.

The water initially was stored in huge bolted tanks in the aftermath of the disaster, but the tanks have leaked highly contaminated radioactive water into the sea on an alarming number of occasions.

Now Tepco is building more secure welded tanks to hold the water, theoretically for up to 20 years. There are now about 1000 tanks holding 750,000 tons of contaminated water, with space for 100,000 tons more. The company says it hopes to increase capacity to 950,000 tons within a year or two, as well as halve the amount of water that needs to be stored from the current 300 tons per day.

As part of those efforts, Tepco has built a 1500-metre-long “ice wall” around the four reactor buildings to freeze the soil and keep groundwater from getting in and becoming radioactive. Company officials hoped to have the just-completed wall working next month; on Wednesday, though, Japan’s nuclear watchdog blocked the plan, saying the risk of leakage was still too high.

The options for getting rid of the contaminated water include trying to remove the tritium from it before letting it run into the sea; evaporating it, as was done at Three Mile Island, the Pennsylvania plant that melted down in 1979; and injecting it deep into the ground, using technology similar to that used to extract shale gas. A government task force is considering which option to choose.

“These all have different advantages and disadvantages; they have different costs and different social acceptance,” said Seiichi Suzuki, manager of tank construction at the plant.

Then there’s the radioactive soil that has been collected from areas around the Fukushima Dai-ichi plant during clean-up efforts. Nearly 20 million cubic metres of soil — enough to fill 8000 Olympic-size swimming pools — has been packed into large black plastic bags and is being stored, row upon row, in local fields.

More than 700 of the bags, which contain radioactive cesium isotopes, were swept away during floods last year, some ending up in rivers 160 kilometres away. The government has said that 99.8 percent of the soil can be recycled.

Finally, and most problematically, there’s the nuclear fuel from the plant itself.

The fuel that melted down remains in containment vessels in its reactors, and this part of the plant is so dangerous to humans that robots are used to work there. Getting to this fuel and removing it safely is a task that will take decades.

Asked about the decommissioning process, Ono of Tepco said the work was about 10 per cent done.

“The biggest challenge is going to be the removal of the nuclear fuel debris,” he said. “We don’t even know what state the debris is in at the moment.”

Japan does not have a nuclear waste dump, and there is vehement resistance to disposing of contaminated material on land.

As a result, one of the options the government is considering is building a nuclear waste dump under the seabed, about 13 kilometres off the Fukushima coast. It would be connected to the land by a tunnel so it would not contravene international regulations on disposing of nuclear waste into the sea. A government study group is set to report on that proposal by the end of the summer.

Many groups, from fishermen to anti-nuclear activists, staunchly oppose the idea of burying the radioactive material at sea in such a seismically active area.

“At some point it would leak and affect the environment,” said Hideyuki Ban, co-director of the Citizens’ Nuclear Information Centre. “Some say it’ll be fine, as it will be diluted in the ocean, but it’s unclear whether it will be diluted well. If it gets into fish, it could end up on someone’s table.”

Aileen Mioko Smith, executive director of Green Action, a Kyoto-based anti-nuclear group, agreed.

“The seabed is just like land. It’s not flat, but has mountains and valleys,” she said. “Japan sits on multiple tectonic plates and is earthquake-prone. It’s too easy to think, ‘If not on land, how about the seabed?’ “http://www.smh.com.au/world/five-years-after-nuclear-meltdown-no-one-knows-what-to-do-with-fukushima-20160211-gmr5sv.html#ixzz3ztnYcrCY

February 12, 2016 Posted by | Fukushima 2016, Japan, wastes | Leave a comment

Japan Nuclear Regulation Authority Halts Fukushima Daiichi’s Ice Wall

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Japanese Nuclear Regulation Authority, the NRA, has put the kibosh on plans by Tokyo Electric Power Co. to start freezing underground soil at the crippled Fukushima No. 1 nuclear power plant–a stunningly expensive project intended to solve the crisis of accumulating radioactive groundwater at the site.
The installation of the equipment required for forming a wall of frozen soil at the Fukushima Daiichi nuclear power plant to prevent groundwater entering the reactor buildings has been completed. Approval from the Japanese regulator must be sought before the creation of the wall itself can begin.
Ice wall technology is already widely used in civil engineering projects, such as the construction of tunnels near waterways. Small-scale tests using the technology have already been completed at the Fukushima Daiichi site. However, the full-scale use of the technology at Fukushima will see the largest ground freezing operation in the world.
Installation of the equipment for forming the ice wall began in June 2014 and a test that has circulated the chilling liquid to specific parts of the wall has been under way since April 2015. The north, south and west sides of the facility were completed last September, while the remaining pipes on the east side facing the sea were placed within the ground in November.
Tokyo Electric Power Company (Tepco) announced yesterday that all the necessary equipment is now in place for the creation of the ice wall. However, the company noted that it must get approval from the Nuclear Regulation Authority before the equipment can be put into operation. The regulator’s approval, Tepco said, would partly depend on the company “showing a method to ensure that the wall (and other groundwater pumping operations) do not invert the water level difference in any way that would cause contaminated water to flow out of the building’s basements”.
Kajima Corporation, the main contractor for the facility, has drilled holes some 30-35 metres into the ground and inserted pipes through which refrigerant will be then be pumped. This cooling will freeze the soil surrounding the pumps creating an impenetrable barrier around the reactor buildings. In total, some 1550 pipes have been placed in the ground to create a 1.5km-long ice wall around units 1 to 4. The wall is designed to remain effective for up to two months in the event of a loss of power. The Japanese government agreed to pay for construction of the ice wall, estimated to cost some JPY32 billion ($278 million).
Reducing the amount of contaminated water that it must deal with is a priority for Tepco. Groundwater naturally seeps from land to sea, but at the Fukushima Daiichi site it must negotiate the basements of reactors buildings. It is thought that more than 400 tonnes of groundwater enters the basements each day through cable and pipe penetrations as well as small cracks, mixing with the heavily contaminated water previously used to cool the damaged reactor cores.
The ice wall is only one part of a multi-layered strategy being employed to manage the flow of groundwater and rainwater at Fukushima Daiichi, Tepco said. Tepco is saying that its strategy to prevent water becoming contaminated has reduced the daily inflow of groundwater into the buildings to 150 tonnes per day. “Successful implementation of the frozen soil water is designed to reduce that inflow further, by keeping water out of the reactor buildings,” the company contends.
TEPCO has maintained that once the soil is frozen, it will form a circular barrier and reduce the flow of groundwater into the reactor buildings; and that, in turn, will prevent water contaminated with radioactive substances from accumulating.
But the Nuclear Regulation Authority contends that contaminated water accumulated in the reactor buildings could leak into the groundwater if the level inside the frozen soil wall drops too much.
TEPCO planned to construct a 1,500-meter-long frozen soil wall around the four reactor buildings by inserting 1,568 pipes to a depth of 30 meters at 1-meter intervals. Each pipe will freeze the soil around it once liquid of minus 30 degrees circulates inside the cylinder.
On Feb. 9, TEPCO completed the last part of the project to install temperature indicators, allowing it to start freezing the soil at a moment’s notice.
Groundwater is continuing to flow into basements of reactor buildings with melted nuclear fuel, adding to the amount of highly contaminated water being produced.
In May 2013, a committee of the Ministry of Economy, Trade and Industry drew up a report on the merits of constructing a frozen soil wall to reduce the volume of contaminated water.
Based on the report, TEPCO started the construction work in June 2014. The government has already spent about 34.5 billion yen ($300 million) on the project.
TEPCO maintained that once the frozen soil wall is completed, it should reduce the flow of groundwater into the reactor buildings from about 400 tons a day to 100 tons in tandem with other measures, including work to pump out groundwater from wells dug around the reactor buildings.
From the outset, the NRA cast doubt on the effectiveness of the frozen soil wall, saying that highly contaminated water accumulated in reactor buildings could leak into the ground if the groundwater level inside the wall drops too much.
The NRA repeatedly asked TEPCO whether the frozen soil wall would prove truly effective in reducing the amount of contaminated water.
“TEPCO is scattering a strange illusion that the problem of contaminated water can be solved completely if a frozen soil wall is constructed,” NRA chairman Shunichi Tanaka said in spring 2015.
In a test operation which started that spring, the reduction of groundwater levels was larger than expected in some places. The speed and direction of the groundwater flow could not be clarified in some locations.
Because it takes two months or so for the soil to thaw out, countermeasures cannot be taken immediately if problems crop up.
TEPCO acknowledges that there are limits to its crystal ball-gazing with regard to the problem of groundwater. However, it contends that it can prevent contaminated water from leaking into the ground by pouring water into the ground through wells if the level drops too much.
In December, the NRA took the rare move of proposing to TEPCO in a written document that the utility operate the frozen soil wall only in places where contaminated water is unlikely to leak into the ground.
However, TEPCO dug in its heels and said it intended to operate the frozen soil wall as a whole. But it also plans to consider the NRA’s proposal.
On Feb. 9, TEPCO President Naomi Hirose visited the NRA office and told Tanaka, “We will consider your proposal and get back to you in a most sincere manner.”

 

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Sources :
http://www.tepco.co.jp/en/press/corp-com/release/2016/1267045_7763.html
http://www.world-nuclear-news.org/RS-Fukushima-Daiichi-ice-wall-equipment-in-place-1002165.html
http://www.japantimes.co.jp/news/2016/02/10/national/tepco-finishes-installing-fukushima-ice-shield-equipment/#.VrvH1lLzN_k
http://ajw.asahi.com/article/0311disaster/fukushima/AJ201602100079

 

February 11, 2016 Posted by | Fukushima 2016 | , | 1 Comment

Over 0.5 μSv/h detected from mud in Shibuya ward Tokyo

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On 2/4/2016, a Japanese citizen posted on Twitter that 0.51 μSv/h was detected on accumulated mud in Shibuya ward of Tokyo.
The location is 2-17-5 Jingu-mae, Shibuya ward. The area is used as a coin-parking lot. The area is not blockaded.
Source : http://fukushima-diary.com/2016/02/photo-over-0-5-%CE%BCsvh-detected-from-mud-in-shibuya-ward-tokyo/

February 6, 2016 Posted by | Fukushima 2016 | , , | Leave a comment

How Officials and Popular Academics Have Responded to Disaster Victims

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On Fukushima Prefecture and Hiroshi Kainuma: How Officials and Popular Academics Have Responded to Disaster Victims in the Wake of Tokyo Electric Power Company’s Fukushima Nuclear Accident
By Toshinori Shishido
日本語の原文『東京電力福島原子力発電所事故発生前後から現在までの、福島県庁と開沼博氏達による被災者への対応』
1. About the author
I worked as a full-time teacher at a public high school in Fukushima for about twenty-five-and-a-half years, until July 31, 2011. During the first four years of my career, I taught at Futaba High School in Futaba-machi, home to the Fukushima Daiichi Nuclear Power Plant. Naturally, I have heard stories about the harsh working conditions of nuclear workers. For example, in a certain area of the power plant, working for 10 minutes would exceed the legal maximum daily radiation exposure limit. So each shift was officially recorded as 10 minutes even though their actual worked shift was 8 hours. The workers would primarily wipe water leaking from the piping surrounding the nuclear reactor. When workers died of illnesses like cancer, their families received unusually high amounts of cash as lump-sum payments, while actual workmen’s compensation insurance was not provided.
At the time of the 2011 nuclear accident, I was living in a city 53 kilometers (33 miles) away from the power plant with my wife and two children. I was working at a public school 60 kilometers (37 miles) from the plant.
After the accident, on the evening of March 15, 2011, the maximum airborne radioactive levels of 23 microsievert/hour was detected in Fukushima City, where I worked. Outside the school the following day, however, the annual school acceptance announcements were held as scheduled. Several faculty, including myself, met with the principal to insist that usual outdoor announcement be cancelled as to avoid having young students exposed to radiation–but the announcement event was forced outdoors.  The principal cited  reasons such as, “the Fukushima Prefecture office strongly supports the outdoor plan” and he “had no choice as the school principal.”
From April 2011 on, aside from the prohibition of outdoor gym classes, neither my school nor the Fukushima Board of Education took any measures to prevent further radiation exposure for students. The school had students practice club activities outdoors as usual. Indoor club athletes were made to run outdoors as well, without any protective measure against radiation exposure. Despite the standard practice, measures such as gargling, washing hands, changing clothes, and showering weren’t deemed necessary for students when returning from outdoor activities. Since I had some knowledge about radiation exposure, I advised the students to take caution to remove potential contamination whenever possible. However, in response to my giving the students advice to prevent radioactive materials from entering the building, I had been cautioned by the Fukushima Prefectural Board of Education, in the form of official “guidance” which forbids me to even talk about radiation and nuclear power plants to the students. Given that I was officially barred from protecting students from radiation exposure, I decided to make my move: along with my family, I evacuated my hometown and relocated to Sapporo city in Hokkaido. We were supported by staff and Toru Konno at the Hokkaido Prefectural government who led the way through the interference by Fukushima Prefecture, and Sapporo City, as well as by the support of the people at the NPO Musubiba. Once we evacuated, we found out about a financial system by Fukushima Prefecture which supports voluntary evacuees from the areas outside of the officially restricted zone (though it only approved applications from evacuees pre-December 2012; those who evacuated thereafter would not be financially supported).
I have been teaching part-time in Hokkaido. Since finding out that within the public school system the Fukushima Prefecture Board of Education can intervene to oversee public high school relocation anywhere, I have been teaching at private schools only. Aside from my part-time job, I have been involved in a nuclear power plant damages lawsuit as a plaintiff as well as a member of the refugee organization.

1. Fukushima Prefectural Government and the Tokyo Electric Power Company (TEPCO)’s Fukushima Nuclear Accident
The reactors at the TEPCO Fukushima Daiichi Nuclear Power Plant, especially Unit 1 and Unit 2, were delivered and installed from the US after the US manufacturer finished all of their construction. As for Units 3, 4, 5, and 6 the Japanese manufacturer added their own “improvements” to the original structure.
I will try to avoid a lengthy explanation. TEPCO’s Fukushima Daiichi Nuclear Power Plant frequently had accidents immediately after beginning operation and the nuclear workers’ exposure levels amounted to twice to ten times the average exposure dose at other nuclear plants. Furthermore, TEPCO kept a lot of serious accidents hidden from Fukushima Prefecture and the Japanese government. TEPCO proposed using Unit 3 for so-called pluthermal power generation, utilizing fuel which can contain weapons-grade plutonium in order to reduce the plutonium surplus in Japan. Eisaku Sato, then-governor of Fukushima, strongly objected to the proposal.The Japanese government arrested and convicted Governor Sato on bribery charges with the amount of the bribe recognized as “zero yen.” They drove him to resign, then elected Yuhei Sato as the new governor. As described above, neither the Fukushima governor nor the organization called the Fukushima Prefectural Government had power over TEPCO.

2. Nuclear accident and the Fukushima Prefectural Government
March 11, 2011, when a massive earthquake hit a wide area including Fukushima Prefecture, the building of the Fukushima prefectural office (which had been planned to function as a Disaster Response Headquarters) was damaged in the earthquake. The headquarters were set up in a small building next to the main office building to serve temporary functions. The prefectural government has never publicized records of proceedings and documents from over 20 meetings in the beginning. From the 25th meeting, they finally began keeping records of proceedings.
At the time, the temporary disaster response headquarters was believed to have had little to no communication lines, and had reportedly only two satellite mobile phones. Although the communication infrastructure began to be rebuilt gradually, what was happening then still remains largely unknown. There has been no official investigation into the correspondence between the local governments, the central government and TEPCO, and no evacuation orders to the local communities.
As far as public record goes, the only time Fukushima Governor issued an announcement in the first week was on the evening of March 14th. “Follow the instructions and  do not panic,””High school entrance announcements will be held as planned on March 16th,”— these two lines were broadcast repeatedly throughout local media.
From another angle, the recordings of the TEPCO video conference shows that Fukushima Prefecture requested TEPCO make a public announcement saying “the explosion in the Unit 3 at Fukushima Daiichi will not cause health damage.” Appalled by the request, thinking they “couldn’t say such an irresponsible thing,” TEPCO decided to “ask the central government to suppress Fukushima Prefecture,”—as evidently recorded during the video conference.
However Fukushima Prefecture repeatedly expressed that in the “Nakadōri” region—which includes the prefectural capitol, Fukushima City, and the commercially and industrially flourishing Koriyama City—there would be zero risk of health damage from radiation.
There has been a use of protective measures like wearing long-sleeves and masks for school children, which may have been a globally familiar sight through media reports. However this was not a recommendation or an order issued by Fukushima Prefecture, but rather a result of demands from local PTAs to boards of education in individual school districts.
Towards the end of March 2011, right before the school year resumed, the Fukushima governor was seen out in local grocery stores saying “Fukushima today is business as usual,” in which he began a campaign to “dispel harmful rumors” about local agricultural produce being contaminated by radiation. The governor also opposed widening the evacuation zone beyond the 20km radius of the nuclear power plant, and has repeatedly made remarks to avoid increasing the number of evacuees from outside the official evacuation zone.
As a result, aside from two local Fukushima newspapers, NHK, and four private television networks in addition to NHK Radio and Radio Fukushima, there was little to no mention of messages from outside Fukushima offering free housings and support networks for voluntary evacuees. Fukushima Prefecture also prohibited the use of not only public conference centers, but private facilities for hosting “counseling room” for evacuation as well. People around me practically had no knowledge of local autonomous support groups offering evacuation support. I have heard numerous times that “there is no evacuation order from outside the prefecture, meaning we have been abandoned.” In fact, it was Fukushima Prefecture who had been interfering with such efforts to reach our community.
Hiroshi Kainuma, “the Sociologist”
In 2011, an author from Fukushima became renowned after publishing the book “Fukushima’ theory–the birth of a nuclear village,” based on a thesis he wrote as a sociology student at the University of Tokyo Graduate School of Interdisciplinary Information Sciences. His name is Hiroshi Kaiuma, born in Iwaki City, Fukushima, and graduated from the University of Tokyo Literature department at the age of 25 and advanced to the graduate program. I must note that this is difficult to grasp if you are not well-connected within Fukushima. But in short, Iwaki City, where Mr. Kainuma was born and raised, has very little connection to the Futaba district which hosts TEPCO’s power plant. In terms of large-scale trading areas, while the Futaba district is part of the Sendai, Miyagi Prefecture trade area, Iwaki City would be part of Mito City in Ibaraki Prefecture. In any case, Mr. Kainuma did not have strong connections to the Fukushima Prefectural government prior to March 11th, 2011.
Since the meltdown, however, he has somehow become “the Fukushima spokesperson who speaks about Fukushima on TV and radio.”
Additionally, I have written several critiques of his writings, one of which can be found on the following link (in Japanese): “Personal note on “‘Fukushima’ theory–the birth of a nuclear village’” http://togetter.com/li/815862

4. Hiroshi Kainuma and the Fukushima Prefectural Government
After 3.11, his master’s thesis was published in books and he began to be featured in various media, including an appearance as a commentator on the popular evening program “Hodo Station (News Station).” We must note that the content of his remarks have been consistent—such as, “The acceptance of nuclear power plant by local communities was necessary for the regions’ survival”; “Those outside of Fukushima protesting against nuclear energy do not understand the reality of nuclear-hosting communities.” His views and comments on the anti-nuclear movement have been antagonistic from the beginning, for example, “People who oppose nuclear energy are rubbing local communities the wrong way.”
Mr. Kainuma currently holds the title of Junior Researcher of the Fukushima Future Center for Regional Revitalization, but at the same time he is a PhD student at the University of Tokyo. While it would be appropriate to call him a sociology researcher, I feel it’s an overestimation to refer to him as a sociologist.
Currently the gist of Mr. Kainuma’s speech is towards the “recovery of Fukushima in visible forms” and its target audience is outside Fukushima Prefecture. While many others have in fact been referring to “bags” jammed with contaminated waste—seen everywhere and impossible to be ignored upon entering Fukushima—Mr. Kainuma continues to emphasize the “ordinary Fukushima” without mentioning the bags.
I see the previous governor of Fukushima, Yuhei Sato, in Mr. Kainuma in many ways, like in his seeming lack of experience interacting with people in temporary housings immediately following the meltdowns, or with shelter residents still living with much confusion and inconveniences as a result of the disaster.
Even the current Fukushima governor does not seem to have made too many visits to temporary shelters during or after elections.
To those who evacuated Fukushima to outer prefectures like myself, the Prefecture kept even more distance. By principle, they never made any official inspection visits to meet the evacuees. There is a notable lack of inspection visits not only in remote areas such as Hokkaido, but also in places like Yamagata and Niigata which are adjacent to Fukushima Prefecture.
In the wake of the disaster, though there was housing support for those who evacuated the areas outside of Fukushima as well, such efforts have gradually died down—as of March 2016, state subsidies for housing would be available only for evacuees who are from Fukushima. In addition, the housing subsidy program for those who evacuated the non-restricted zone will end in March 2017. However, there is no housing program for returning residents to Fukushima even if they decide to move back there.
Starting March 2017, voluntary evacuees still living in outer prefectures need to choose one of the three following choices:
1) Return home to Fukushima while paying out-of-pocket for most of the expenses associated with the move and your life thereafter. 2) Continue living outside Fukushima while relinquishing your rights to access resources as a disaster victim 3) Upon proving your need for financial assistance, receive housing subsidies for up to 2 years to live in privately-owned housing.
The reason for this policy change was credited to correspondence between the Minister of Environment and the Nuclear Regulatory Authority, a non-governmental agency to provide scientific grounds for nuclear policy. The Minister of Envirnoment asked the NRA if “it is considered desirable to evacuate the areas that don’t have restrictions” to which the NRA answered, ”these areas are no longer fit to be evacuated.” It should be noted that there was no legal ground for this correspondence to be treated as official; how this exchange was reviewed and by whom is unknown.
Based on this document issued by the NRA, the Japanese government made a Cabinet decision to largely reduce support for evacuees through the Nuclear Accident Child Victim’s Support Law.
Following this decision, Fukushima Prefecture also determined its policy would end support for the voluntary evacuees from non-restricted areas.
Hiroshi Kainuma is working from an assumed role to justify such policy of Fukushima Prefecture, utilizing his position as a so-called sociologist. Even if he has ideas and views that differ from Fukushima Prefecture’s policy, he does not speak about them on media or at talk events.
For instance, when Mr. Kainuma was relatively unknown before 3.11, he had reportedly interviewed local anti-nuclear activists. Another instance tells us that although he had met and interviewed several people who have moved voluntarily out of the non-restricted areas, he proceeds to ignore the voices and opinions of them as though they had never existed.
Last year, nuclear reactors in Japan started resuming operation. Mr. Kainuma has not been seen or heard expressing opposition to it. Neither Fukushima Prefecture nor the Prefectural Assembly expresses any intentions to oppose nuclear restorations.
5. The current presence of “Hiroshi Kainuma”
Through the circumstances described above, Hiroshi Kainuma is working so as to be portrayed by the media as a Fukushima Prefecture spokesperson, intent on selling “business-as-usual” appeal and depicting a Fukushima that “overcame a nuclear disaster.”
Meanwhile, and quite unfortunately, many Fukushima residents agree with his words and actions. Just as there are many people hoping to forget the scars from the 1995 Great Hanshin Earthquake, there are many who explicitly “do not evacuate,” comprising an overwhelming majority of the Fukushima population and wishing to forget and move past the disaster and nuclear crisis.
Here we have an academic scholar who speaks for us and to those who are outside Fukushima as well, saying to leave the nuclear disaster in the past.
Thus, this concludes the significance of Hiroshi Kainuma’s existence today.

(Translation by Sloths Against Nuclear State)
Source : https://jfissures.wordpress.com/2016/02/04/on-fukushima-prefecture-and-hiroshi-kainuma/

February 6, 2016 Posted by | Fukushima 2016 | , | Leave a comment

Fukushima Meltdown Highly Radioactive Glass Nanoparticles

Researchers in Japan found new materials they described as tiny spherical glass particle that was highly radioactive. Researchers found that the radioactivity was highest in the center of the particle, indicating the cesium was incorporated into the glass particle during the molten phase of the meltdown. The glass particle also contains materials that indicate it includes either concrete from the containment vessel or seawater that was injected.
Microparticles containing substantial amounts of radiocesium collected from the ground in Fukushima were investigated mainly by transmission electron microscopy (TEM) and X-ray microanalysis with scanning TEM (STEM). Particles of around 2 μm in diameter are basically silicate glass containing Fe and Zn as transition metals, Cs, Rb and K as alkali ions, and Sn as substantial elements. Nano-sized crystallites such as copper- zinc- and molybdenum sulfide, and silver telluride were found inside the microparticles, which probably resulted from the segregation of the silicate and sulfide (telluride) during molten-stage. 0.2 μm thick exists at the outer side of the particle collected from cedar leaves 8 months after the nuclear accident, suggesting gradual leaching of radiocesium from the microparticles in the natural environment.

 

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Photo of the glass sphere from Nihonmatsu, from the Yamaguchi et al study.

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Cross section of the NWC-1 glass sphere from Nihonmatsu, photo credit Yamaguchi et al.

Although almost five years have passed since the accident of Fukushima Daiichi Nuclear Power Plant (FDNPP), radioactive contamination in the surrounding area is still a serious problem in Japan. Wet deposition was a major source of radiocesium contamination of terrestrial environment1, while contribution of dry deposition was larger near the FDNPP2. Deposition of radiocesium as insoluble particles has also been pointed out. On the aerosol filter collected from March 14–15, 2011 in Tsukuba, 170 km south-southwest of FDNPP, Adachi et al.7 discovered spherical particulate radiocesium of 2.0–2.6 μm in diameter, with particles insoluble in water having a glass-like structure8. These microparticles contain several fission products of U-235 other than radiocesium, and Fe and Zn which are also used in nuclear reactors8. Hence, they were considered to be released directly from nuclear reactors.
Kaneyasu et al.9 suggested that vaporized radiocesium was transported with sulfate aerosol in the air, dissolved to cloud droplets and fell as rain. On the aerosol filter collected on March 20–21, 2011, rainy days in Tsukuba, the majority of radiocesium was in water-soluble form7. Such water-soluble radiocesium that reached the ground surface as a solute was fixed to soils, especially to clay minerals10. In the terrestrial environment, the majority of radiocesium is present in solid form regardless of the initial form of deposition. However, compared to clay minerals originally contaminated by soluble radiocesium in soil, the solid radiocesium, which was initially deposited as radioactive microparticles, had stronger radioactivity. Although the contribution or percentage of such radioactive microparticles in the contamination level of Fukushima has not been evaluated, its influence on human health may be serious in terms of its intense radioactivity. Moreover, the structural detail of the microparticles may give insights into the state of the broken reactor and fuel debris.
In the present study, we investigated radioactive microparticles, similar to those reported by Adachi et al.7, but collected from the ground, by observing their internal structure with transmission electron microscopic (TEM) techniques.
Structure and composition of Cesium-bearing radioactive microparticles
Cesium-bearing radioactive microparticles that had been deposited on non-woven fabric cloth (NWC-1) and on a needle of Japanese cedar (Cryptomeria japonica) (CB-8) were investigated. Scanning electron microscope (SEM) images of NWC-1 of the whole microparticle before preparing thin sections for TEM analyses; and elemental composition of the whole particle determined by synchrotron radiation microbeam X-ray fluorescence (SXRF) are shown in Supplementary Figs S1 and S2 online, respectively. The activities of 137Cs for the NWC-1 and CB-8 were 5.04 ± 0.472 and 3.14 ± 0.178 Bq, respectively.

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Photo credit Yamaguchi et al.

Our most significant finding is that the matrix of the Cs-bearing microparticles is silicate glass, based on the TEM-EDS analysis with FIB sample preparation. Previous studies suggested that Fe, Mo, Sn and Zn in the Cs-bearing microparticles had a similar X-ray absorption near-edge structure to those composed of glass8, however the presence of Si in the microparticles has not been verified7,8. It is probable that the high-temperature melt-down fuel from the reactor came into contact with and melted the concrete, and then splashed microparticles of silicate melt, which were solidified by cooling to form silicate glass in the atmosphere. For instance, Ca which is one of the major elements in concrete, was almost absent in the microparticles of NWC-1. Since TEM observed only a small portion of the microparticles, by making them thin using FIB, there may have been other elements in the microparticles, for instance, as a form of chalcogenide nanoparticle.

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Photo credit Yamaguchi et al.

The next important finding is the alkali-depleted crust in CB-8 microparticle. This is probably the result of elution of alkali ions by contact with acidic solution in the field, commonly observed in silicate glass13. This may be attributed to the different environments of the two microparticles after release from the nuclear plant. It is well-known that silicate glass elutes alkali components from their surface by ion-exchange with proton or hydronium ions to form an alkali-leaching layer on the surface if pH of reacting solution is low, whereas the silicate framework of the glass itself is dissolved with high-pH solution13,14. The finding of the alkali-depleting crust on the surface of the Cs-bearing radioactive microparticle indicates that radiocesium in the particles can be released by “weathering” of the glass in natural environments, and considering its small size, duration for the total release of the radioactive cesium from the particles is probably not long, from several years to a few decades, though it will strongly depends on the environment.
In order to investigate the dissolution rate and detailed Cs-leaching properties of the Cs-bearing radioactive microparticles, a leaching experiment should be conducted as a function of temperature and pH. However, collecting and isolating the Cs-bearing microparticles is time-consuming and it is difficult to obtain a large enough number of Cs-bearing microparticles to investigate dissolution properties. Alternatively, synthesized silicate glass with the same composition as the microparticles presented in this study may help to obtain information on the fate of Cs-bearing radioactive microparticles. that fixed to clay minerals in the soil via wet deposition and that contained in the microparticles of silicate glass flown directly from the nuclear reactors. On the other hand, contribution of the microparticles to the air radiation is most likely not significant, but their radiation density is very high, which is particularly problematic for organisms including humans if the microparticles are inhaled or ingested. The plant availability of radiocesium in the microparticles should depend on its solubility.

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Photo credit Yamaguchi et al.

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Photo of black sand substances found in Namie, from research paper by Marco Kaltofan. Photo credit Marco Kaltofan.

 

Cesium-MEXT-Sept-12-2011.pngSources :
1.
Yamaguchi, N. et al. : Internal structure of cesium-bearing radioactive microparticles released from Fukushima nuclear power plant. Sci. Rep. 6, 20548; doi: 10.1038/srep20548 (2016).
http://www.nature.com/articles/srep20548
2.
Marco Kaltofen, MS, PE : Radiological analysis of Namie street dust
http://fr.scribd.com/doc/152720091/Radiological-Analysis-of-Namie-Street-Dust
3.
Japan’s Black Dust, with Marco Kaltofen
http://www.fairewinds.org/nuclear-energy-education/japans-black-dust-with-marco-kaltofen

 

February 6, 2016 Posted by | Fukushima 2016 | | Leave a comment