Prof. Aoyama from Institute of Environmental Radioactivity of Fukushima University reported that the radioactive material discharged from Fukushima plant circulated in the Pacific to come back to Japan offshore.
He implemented seawater analysis at 71 points from 11. 2015 to 2. 2016. The analysis is partially completed to show radioactive material has spread to the South West offshore of Japan. 2 Bq/m3 of Cs-137 was detected in seawater from South West offshore of Kyushu. 1.83 Bq/m3 was detected even offshore of the west coast of Japan.
0.38 Bq/m3 of Cs-134 was also measured to prove this is from Fukushima accident.
It is assumed that the discharged Cs-134/137 travelled to the east in the Northern Pacific. It was carried to the South and West to come back to Japan by taking 2 ~ 3 years.
He comments it is possible that the density of radioactive material increases from now.
”The operator says it expects to burn up to 14 tons of waste per day. But the resulting ash will have a higher concentration of radioactive materials than the waste has before it is burned.”
Fukushima plant begins testing waste incinerators
The operator of Fukushima Daiichi has begun testing an incinerator facility at the damaged nuclear power plant. The facility will be used for burning used protective gear and other waste produced during the decommissioning of the plant’s reactors.
Tokyo Electric Power Company initially planned to start testing the two incinerators at the facility on February 10th. But a water leak forced a delay.
Workers on Thursday began testing one of the incinerators, which had been repaired.
At the end of last year, there were about 66,000 cubic meters of waste being stored at the plant after nearly five years of decommissioning work following the March 2011 accident. That is enough to fill more than 100 swimming pools 25 meters in length.
The incinerators are expected to reduce the volume of waste by about 90 percent. The waste includes used disposable protective gear, clothing, sheets, cardboard and timber.
The operator says it expects to burn up to 14 tons of waste per day. But the resulting ash will have a higher concentration of radioactive materials than the waste has before it is burned.
TEPCO says filters installed in the smokestack will prevent the release of radioactive substances. The ash will be stored in drums inside a secure building.
Tokyo Electric Power said it will dispose of some four tons of waste in Thursday’s test. It said it will start testing the other incinerator on Sunday.
TEPCO begins burning radiation-tainted work clothes at Fukushima plant
OKUMA, Fukushima Prefecture–Tokyo Electric Power Co. has started to incinerate the thousands of boxes of lightly contaminated waste, including clothing used by workers, at the Fukushima No. 1 nuclear power plant to reduce the amount of tainted waste on the site.
TEPCO, the plant operator, fired up a special on-site incinerator on Feb. 25 to burn protective suits, gloves, socks and other work clothes worn by plant workers that became contaminated with low-level radiation.
The operation will reduce the amount of tainted work clothing accumulating at the plant during decommissioning operations since the nuclear disaster unfurled in March 2011. The garments cannot be processed outside the plant due to the radiation.
The clothing being incinerated are items with the lowest levels of contamination that have been stored in tens of thousands of 1 cubic-meter special boxes. The number of containers reached 66,000 at the end of last year.
The incinerator is equipped with two types of filters that can reduce the radioactive levels of the exhaust air to less than one-millionth, while reducing the capacity of the waste to about 2 percent.
The incinerator can burn a maximum of 14 tons of items per day when it is operated to capacity for 24 hours. The ash residue will be stored in metallic barrels on the plant compound.
The incineration project was authorized by the Nuclear Regulation Authority in July 2014. TEPCO began operational tests of the incinerator using untainted waste last fall.
An incinerator in Fukushima Daiichi means more incineration, which add more radioaticle nanoparticles dispersed into the air and into the environment.
The operator of the damaged Fukushima nuclear power plant has shown media outlets the site where work has been completed for an underground ice wall. The wall is designed to stop underground water from flowing into the plant’s reactor buildings.
Tokyo Electric Power Company, or TEPCO, began construction of the wall in 2014. Its work was completed earlier this month.
The wall is designed to freeze the soil around the Number 1 to Number 4 reactor buildings in order to keep groundwater from seeping into the structures.
TEPCO has driven about 1,500 pipes carrying refrigerant liquid into the ground around the buildings. The pipes and cooling devices were shown to the media on Tuesday.
But workers have not yet injected a freezing agent into the pipes. This is due to concerns that a sudden drop in groundwater levels may result in the release of radioactive water. TEPCO officials are examining the situation with the Nuclear Regulation Authority, or NRA.
Masato Kino of the Agency for Natural Resources and Energy is in charge of dealing with the contaminated water. He says now that the ice wall is completed, his agency is consulting with the NRA to reduce the volume of radioactive water at the plant.
TEPCO officials also showed the media an incinerator that will burn contaminated waste such as used protective suits.
Officials plan to start testing the incinerator on Thursday.
They hope it will help reduce about 66,000 cubic meters of waste that has accumulated at the plant.
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