A Tiny Hole at Sweden’s Oldest Atomic Plant Upends Nuclear Revival
Industry and lawmakers in Sweden want Vattenfall to reverse a decision to close two aging reactors. Bloomberg, By Jesper Starn, May 20, 2019
A hole just a few millimeters deep at Sweden’s oldest nuclear plant is upending the debate about whether to revive the technology to ensure that the Nordic region’s biggest economy has enough power.
Regulators assume such a small gap exists at the Ringhals-2 plant on the nation’s west coast because repairs to similar cavities were made earlier in the decade on about half of an area covering 700 square meters (7,535 square feet). The owner Vattenfall AB won’t carry out more costly repairs and its permit expires at the end of the year.
While the state-controlled power company doubts that further faults exist, it would rather scrap the plant than uproot the meter-thick slab of concrete surrounding the massive steel plates that make up the reactor containment……..
For the moment, Vattenfall isn’t budging on the decision it made in 2015 to wind down operations at the plant, which includes two reactors that began operations in 1975 and 1976. Those reactors lack the independent core cooling systems required by the regulator for all nuclear plants to operate after 2020. Vattenfall invested 900 million kronor ($93 million) to upgrade two younger reactors at the site.
“I regard it as completely ruled out, both technically and financially,” to reverse the decision to close the Ringhals reactors, Torbjorn Wahlborg, the company’s head of generation, said in an interview. “It would require such a big investment and long halts.”
At its peak, nuclear energy accounted for about half of the nation’s power. Hydroelectric plants covered the rest. Now it’s 40% and wind parks being built in the north of the country are seen as a major future source. The problem is that the growth of wind has not been able to match the decline in capacity at reactors and fossil-fuel plants and Sweden is already depending on imports to meet demand on cold winter days.
A Sifo poll from March show that two thirds of Swedes want to keep or build more reactors.
In 2016, five political parties formed a long-term energy agreement that lowered nuclear taxes enough to allow life-span extensions of six reactors built in the 1980s until the 2040s, while four older reactors would be shut. But the largest opposition party, the Moderates, is now threatening to abandon that agreement unless it’s renegotiated to be more supportive of nuclear power. It has the support of the Christian Democrats, which is also part of the accord.
The Liberals, which were not part of the deal, has also proposed to extend the lifespan of Ringhals 1 and 2, and may get support from the nationalist Sweden Democrats, which also wants to invest in nuclear. The Moderates and the Christian Democrats have called for a review to be made into the possibility to stop the closure of the two reactors.
Still, it would be an uphill battle to garner enough support for any new energy plan, as the remaining parties in the agreement together with the Left Party have a majority in parliament. It all hinges on the governing Social Democrats. It wants nuclear power to be gradually phased out, but is under pressure from Swedish industry to change its stance.
As Vattenfall is fully state-owned, the government could adjust its directive to extend the life-span of the reactors. Lobby groups for the forest, metals, chemical and mining industry are calling for an investigation to see if this is possible. This would however be against the spirit of the original agreement, where market-based decisions was a key-part to get parties with opposing views to compromise on energy, according to the Swedish government. …… https://www.bloomberg.com/news/articles/2019-05-20/swedish-nuclear-plant-s-tiny-hole-nobody-has-seen-halts-revival
MKG 4th April 2019 [Machine Translation] SKB speaks to the government on copper corrosion:
“Still no problem” The power industry’s nuclear waste company On April 4,
SKB expressed its opinion to the government with a supplement to, in the
first place, certain that the copper canister will function as intended in
the planned final repository for spent nuclear fuel in Forsmark.
Not surprisingly, the company will claim that there are no problems. This is
the same claim that the court rejected in its opinion to the government on
January 23, 2018. In a first analysis, the environmental organizations’
nuclear waste review has concluded that the compilation is very weak and
does not show that the court’s concerns are unfounded. It is now important
that the Swedish Radiation Safety Authority performs a renewed thorough and
unconditional review of both the old and the new data.
GDF Watch 4th Nov 2018 , The company responsible for delivering Sweden’s deep geological repository, SKB, is planning to subject their research into copper
corrosion to international peer review in the new year. SKB believe this is
the most transparent and open way in which to address concerns about the
contentious issue, which has held up final decision-making on the Swedish
national repository for higher activity radioactive waste.
Earlier this year the Swedish Environmental Court largely approved SKB’s plans for a
geological disposal facility in Osthammar. However, the Court had concerns
about the speed at which copper canisters corrode and the potential
consequential environmental impact. Conflicting scientific evidence was
presented to the Court. The Court decided that this was something the
Swedish Government needed to consider further before any approval was given
to the planned radioactive waste disposal facility. The Swedish Government
asked SKB to provide additional information by 31 March 2019. http://www.gdfwatch.org.uk/2018/11/04/sweden-copper-corrosion-update/
Sweden calls for nuclear reactors to be shielded from hot weather, Business Times, AUG 21, 2018
[OSLO]Sweden’s nuclear energy regulator SSM has asked plant operators to produce plans in the coming months to shield their reactors from harmful hot weather, its director told Reuters on Monday.
A number of Swedish reactors had to shut down or reduce output as the summer heatwave sent temperatures to record highs in July, with the sea water that is used to cool them becoming much warmer than normal, exceeding safety levels. The last time that SSM, the Swedish radiation safety authority, asked operators to produce plans to modify their reactors was after Japan’s Fukushima disaster in 2011. The cost of those changes, which are due by 2020, was in the hundreds of millions of euros.
“We really have to take into consideration what happened this summer … We have asked them orally to come with suggestions. Of course there will be a cost. I do not know how much at this stage,” said SSM chief Mats Persson said.
Populists May Rip Up Sweden’s Nuclear Code of Conduct, Bloomberg, By Jesper Starn,
Five party bi-partisan agreement from 2016 under threat
Energy system will be tested this winter after atomic closures
Sweden’s biggest ever cross-party energy deal was designed to provide stability for utilities for almost three decades, but the 2016 accord is now at risk of being ripped up after next month’s general election.
The Sweden Democrats, which some polls show could emerge as the biggest party, would revoke nuclear-plant closures central to the agreement if they came to power. The Christian Democrats, one of the accord’s co-signers, on Tuesday echoed that view and pressed for key parts of the deal to be renegotiated.
The agreement ended more than 30 years of bickering over nuclear power, extended support for renewable energy and stated that there should be zero emissions impacting the climate by 2045. It effectively boosted the lives of the nation’s six newest reactors until at least 2040, but didn’t address how the capacity of four older Vattenfall AB and EON SE units will be replaced. …….https://www.bloomberg.com/news/articles/2018-08-16/nuclear-revival-talk-could-upend-historic-swedish-energy-accord
Water from the Baltic Sea is used to cool several nuclear reactors along Sweden’s coastline, but temperatures are unusually warm following a prolonged period of hot weather.
Vattenfall on Monday posted plans to take Ringhals 2 out of operation after water reached that reactor’s 25 degree Celsius limit
However Vattenfall spokesman Peter Stedt said on Tuesday it had opted to keep capacity at 49 percent after the sea water cooled to 24 degrees, while closely monitoring water temperatures as the warm weather continued.
The 865-megawatt (MW) pressurized water Ringhals 2 reactor is one of four reactors, which produce around 20 percent of Sweden’s electricity. While Ringhals 3 and 4 are still online, Ringhals 1 is shut for annual planned maintenance. (Reporting by Anna Ringstrom Editing by Alexander Smith)
At least 11 wildfires are raging inside the Arctic Circle as the hot, dry summer turns an abnormally wide area of Europe into a tinderbox.
The worst affected country, Sweden, has called for emergency assistance from its partners in the European Union to help fight the blazes, which have broken out across a wide range of its territory and prompted the evacuations of four communities.
Tens of thousands of people have been warned to remain inside and close windows and vents to avoid smoke inhalation. Rail services have been disrupted.
The Copernicus Earth observation programme, which gives daily updates of fires in Europe, shows more than 60 fires burning across Sweden, with sites also ablaze in Norway, Finland and Russia, including in the Arctic Circle.
Norway has sent six fire-fighting helicopters in response to its neighbour’s request for assistance. Italy is sending two Canadair CL-415s – which can dump 6,000 litres of water on each run – to Örebro in central southern Sweden.
In western Sweden, fire-fighting operations were temporarily halted near an artillery training range near Älvdalen forest due to concernsthat unexploded ordnance might be detonated by the extreme heat.
Residents in Uppsala said they could see the plumes of smoke and have been banned from barbecuing in national parks, after 18 consecutive days without rain.
“This is definitely the worst year in recent times for forest fires. Whilst we get them every year, 2018 is shaping up to be excessive,” said Mike Peacock, a university researcher and local resident.
There have been huge fires in the past in Sweden, but not over such a wide area. This appears to be a trend as more and bigger blazes are reported in other far northern regions like Greenland, Alaska, Siberia and Canada.
The sparks come from a variety of sources: BBQs, cigarettes and increasingly lightning, which is becoming more frequent as the planet warms.
Swedish authorities say the risk of more fires in the days ahead is “extremely high” due to temperatures forecast in excess of 30C. Much of the northern hemisphere has sweltered in unusually hot weather in recent weeks, breaking records from Algeria to California and causing fires from Siberia to Yorkshire. Ukraine has been hit especially hard by wildfires.
The European Forest Fire Information System warned fire danger conditions were likely to be extreme across much of central and northern Europe in the coming weeks.
EU officials said many of this year’s fires are outside the traditional European fire zone of the Mediterranean, and are increasingly taking place at unexpected times of year. 2017 was the worst fire year in Europe’s history, causing destruction to thousands of hectares of forest and cropland in Portugal, Spain and Italy, as late as November. “There are clear trends of longer fire seasons and frequent critical periods in Europe that are leading to dangerous fire situations,” said a European commission official.
Climate scientists said the Arctic and other areas that were once relatively fire-free are likely to become more vulnerable.
“What we’re seeing with this global heatwave is that these areas of fire susceptibility are now broadening, with the moors in north-west England and now these Swedish fires a consequence of that,” said Vincent Gauci, professor of global change ecology at the Open University.
“Both these areas are typically mild and wet which allows forests and peatlands to develop quite large carbon stores,” he added. “When such carbon-dense ecosystems experience aridity and heat and there is a source of ignition – lightning or people – fires will happen.”
Reuters 18th July 2018 , China General Nuclear Power Corporation (CGN) has acquired a 75 percent
stake in a Swedish wind power project from Australia’s Macquarie Group
and GE Energy Financial Services, state news agency Xinhua reported on
Wednesday. The North Pole wind power project, located in Pitea, Sweden, is
expected to be operational by the end of 2019 with a capacity of 650,000
kilowatts, making it the single largest onshore wind power park in Europe,
Xinhua said. https://uk.reuters.com/article/us-cgn-sweden/chinas-cgn-acquires-75-percent-of-swedish-wind-farm-xinhua-idUSKBN1K81IC?rpc=401&
Wild boars in Europe, parts of the former Soviet Union and Japan are too radioactive to be safe for human consumption. That sounds like good news for the boars. But only partly so.
The boars are radioactively contaminated due to fallout from the April 26, 1986 Chernobyl, Ukraine nuclear power plant explosion. They were vulnerable because they love mushrooms and truffles. These fungi absorbed the cesium-137 fallout released by the Chernobyl nuclear explosion.
Because they lack stems and roots, mushrooms and other fungi use absorption to obtain nutrition from the atmosphere through their surface cells. As a result, they are prone to absorbing radioactive substances such as cesium-137 and other radionuclides.
When the boars eat the mushrooms and truffles, that radioactive contamination moves up the food chain. The mushrooms are also too radioactive for human consumption.
Consequently, hunters in Saxony, Germany, 700 miles from Chernobyl, still have to have any boar they kill tested first for radioactivity.
Hunters in Sweden are equally wary of killing and eating wild boar, which have been found to be 10 times more radioactive than the “acceptable” (but, as always, not “safe”) limits for consumption.
Wild boars have of course been affected in Japan as well, since the 2011 Fukushima disaster. Apart from roaming at will through the deserted prefecture — where they have even been observed entering and occupying abandoned houses — these animals also carry cesium contamination. However, one study at least has shown that their cesium levels are significantly lower than those of boars affected by Chernobyl fallout.
The unsuitability of wild boars for human consumption resulting from Chernobyl may sound like a win for boars and the vegetarian cause. But this radioactive contamination may come at a price. To date, studies of wildlife in the Chernobyl and Fukushima zones have shown that even if numbers of animals appear to have increased due to the absence of human predators, the health of these species contaminated with radiation has been seriously compromised.
Birds, mice and insects have demonstrated low to zero sperm counts, a tendency to tumors and cataracts, smaller brains, and shorter lifespans. Examination of muscle tissue and bone marrow in Macaque monkeys living in the contaminated areas of Fukushima yielded ominous signs. The monkeys had significantly low white and red blood cell counts as well as a reduced growth rate for body weight and smaller head sizes. The bone marrows of these monkeys were found to be producing almost no blood cells. Instead, the bone marrow has turned almost entirely into white-looking fat.
So far, Europe’s wild boar seem to have been evaluated only in relation to their contribution as a food source. Missing from the studies is what might be happening to the health of the boars themselves, and the implications for future generations of these animals.
“Gleaning the contamination levels of boars once they are killed is not enough,” says Cindy Folkers, radiation and health specialist at Beyond Nuclear, who looked at published studies on boars and radioactivity. “There is no history of their contamination level or any comparison to any damage they may have suffered. The genes could tell us that, but it appears no one is looking.”
Such changes, especially to DNA, can take many years and several generations to manifest as disease. But if negative outcomes do occur, this could signal a decline in the species, with repercussions for other animals along the food chain as well.
“Wild boars are one of the biomagnifiers of radioactivity in the environment,” added Folkers. “They dig in soil that might be slightly contaminated with cesium, inhaling and ingesting it, and foraging for mushrooms, which they then ingest. They are part of the ecosystem that keeps the cesium circulating.”
The court said no to the application because it considered that there were problems with the copper canister that had to be resolved now and not later.
the UK’s National Nuclear Laboratory (NNL) is to carry out an expert peer review of a Canadian research programme on microbiologically influenced corrosion of canisters that will be used to dispose of used nuclear fuel.
The Swedish Environmental Court has rejected the Nuclear Waste Company SKB’s license application for a final repository for spent nuclear fuel in Forsmark, Sweden. This is a huge triumph for safety and environment – and for the Swedish NGO Office for Nuclear Waste Review (MKG), the Swedish Society for Nature Conservation (SSNC), and critical scientists. Now it is up to the Swedish government to make a final decision.
The Environmental Court took into consideration viewpoints from all parties in the case, including scientists who have raised concerns about disposing spent nuclear fuel in copper canisters. During the legal proceedings, the Swedish NGO Office for Nuclear Waste Review (MKG) and the Swedish Society for Nature Conservation (SSNC) presented the shortcomings of this method of disposal. For many years, the environmental organisations have been arguing that the Nuclear Waste Company SKB need to listen to critical scientists, and investigate alternative disposal methods, especially the possibility of developing a very deep boreholes disposal system. (1) Johan Swahn, Director at MKG said:
“Several independent researchers have criticized both the applied method and the selected site. There is a solid documentation base for the Environmental Court’s decision. It is hard to believe the Swedish Government’s conclusions will be any different from the Court’s.”
MKG has made an unofficial translation into English of the Environmental Court opinion. (2)
The court said no to the application because it considered that there were problems with the copper canister that had to be resolved now and not later. The translation shows the courts judicial argumentation and why it decided not to accept the regulator – the Swedish Radiation Safety Authority’s (SSM’s) opinion that the problems with the integrity of the copper canister were not serious and could likely be solved at a later stage in the decision-making process. The court is quite clear in its statement and argumentation:
“The Land and Environmental Court finds that the environmental impact assessment meets the requirements of the Environmental Code and can therefore be approved. All in all, the investigation meets the high standards set out in the Environmental Code, except in one respect, the safety of the canister.” (Emphasis added)
“The investigation shows that there are uncertainties, or risks, regarding how much certain forms of corrosion and other processes can impair the ability of the canister to contain the nuclear waste in the long term. Overall, these uncertainties about the canister are significant and have not been fully taken into account in the conclusions of SKB’s safety analysis. The Land and Environmental Court considers that there is some leeway for accepting further uncertainties. The uncertainties surrounding certain forms of corrosion and other processes are, however, of such gravity that the Court cannot, based on SKB’s safety analysis, conclude that the risk criterion in the Radiation Safety Authority’s regulations has been met. In the context of the comprehensive risk assessment required by the Environmental Code, the documentation presented to date does not provide sufficient support for concluding that the final repository will be safe in the long term.” (Emphasis added)
The court says that the application is only permissible if the nuclear waste company SKB:
“…produces evidence that the repository in the long term will meet the requirements of the Environmental Code, despite remaining uncertainties regarding how the protective capability of the canister may be affected by: a. corrosion due to reactions in oxygen-free water; b. pit corrosion due to reaction with sulphide, including the contribution of the sauna effect to pit corrosion; c. stress corrosion due to reaction with sulphide, including the contribution of the sauna effect to stress corrosion; d. hydrogen embrittlement; e. radioactive radiation impact on pit corrosion, stress corrosion and hydrogen embrittlement.”
The main difference between the court’s and the regulator’s decision-making was that the court decided to rely on a multitude of scientific sources and information and not only on the material provided by SKB. It had also been uncovered that the main corrosion expert at SSM did not want to say yes to the application at this time that may have influenced the court’s decision-making. In fact there appear to have been many dissenting voices in the regulator despite the regulator’s claim in the court that a united SSM stood behind its opinion.
The court underlines in its opinion that the Environmental Code requires that the repository should be shown to be safe at this stage in the decision-making process, i.e. before the government has its say. The court says that some uncertainties will always remain but it sees the possible copper canister problems as so serious that it is not clear that the regulator’s limits for release of radioactivity can be met. This is a reason to say no to the project unless it can be shown that the copper canister will work as intended. The copper canister has to provide isolation from the radioactivity in the spent nuclear fuel to humans and the environment for very long time-scales.
It is still unclear how the process will proceed. The community of Östhammar has cancelled the referendum on the repository, as there will be no question from the government in the near future. The government has set up a working group of civil servants to manage the government’s handling of the opinions delivered by the court and SSM. SKB has said that it is preparing documentation for the government to show that there are no problems with the canister. Whether the government thinks this will be enough remains to be seen. This is likely not what the court had in mind. The government would be wise to make a much broader review of the issue. There is a need for a thorough judicial review on the governmental level in order to override the court’s opinion. Otherwise the government’ decision may not survive an appeal to the Supreme Administrative Court.
There are eminent corrosion experts who believe that copper is a bad choice as a canister material. There is also increasing experimental evidence that this is the case. The court’s decision shows the importance of democratic and open governance in environmental decisionmaking. It is important that the continued decision-making regarding the Swedish repository for spent nuclear is transparent and multi-faceted. (3)
Copper Canisters The canister has to enclose the nuclear waste for a very long; it is the final repository’s primary safety function. The canister has a 50 mm thick copper shell with an insert of cast iron. The canister must withstand corrosion and mechanical stress.
The investigation on the capability of the canister is extensive and involves complex technical and scientific issues. These include groundwater chemistry, corrosion processes, as well as creep and hydrogen embrittlement (this latter affects the mechanical strength of the canister). However, the parties taking part in the court proceedings disagreed on several issues crucial to the final repository’s long-term security.
The Land and Environmental Court considered the following uncertainties regarding the canister to be most important in the continued risk assessment:
1. General corrosion due to reaction in oxygen-free water. The parties have different views on scientific issues surrounding this kind of corrosion. The Court found that there is considerable uncertainty on this topic that has not been taken account of in SKB’s safety analysis
.· 2. Local corrosion in the form of pit corrosion due to reaction with sulphide. The Court found that there is significant uncertainty regarding pit-corrosion due to reaction with sulphide. This uncertainty has not been included in the safety analysis. In addition, there is uncertainty about the sauna effect, which may have an amplifying effect on pit corrosion.
· 3. Local corrosion in the form of stress corrosion due to reaction with sulphide. The Court found that there is significant uncertainty regarding stress corrosion due to reaction with sulphide. This uncertainty has not been included in the safety analysis. In addition, there is uncertainty about the sauna effect, which may have an amplifying effect on stress corrosion.
· 4. Hydrogen embrittlement is a process that affects the mechanical strength of the canister. The Court found that significant uncertainty regarding hydrogen embrittlement remains. This uncertainty has not been taken account of in the safety analysis.
· 5. The effect of ionizing radiation on pit corrosion, stress corrosion and hydrogen embrittlement. There is significant uncertainty regarding ionizing radiation impact on pit corrosion, stress corrosion and hydrogen sprays. This uncertainty has been included to a limited extent in the safety assessment.
Meanwhile, the UK’s National Nuclear Laboratory (NNL) is to carry out an expert peer review of a Canadian research programme on microbiologically influenced corrosion of canisters that will be used to dispose of used nuclear fuel. The NNL has been contracted by Canada’s National Waste Management Organisation (NWMO) to review its work on the potential for corrosion of the copper-clad canisters. The NWMO is responsible for designing and implementing the safe, long-term management of Canada’s used nuclear fuel under a plan known as Adaptive Phased Management. This requires used fuel to be contained and isolated in a deep geological repository, with a comprehensive process to select an informed and willing host for the project.
The used fuel will be isolated from the environment using a series of engineered barriers. Fuel elements comprise ceramic fuel pellets, which are themselves highly durable, contained inside corrosion-resistant zircaloy tubes to make fuel elements. Bundles of fuel elements are placed into large, durable copper-coated steel containers which are designed to contain and isolate used nuclear fuel in a deep geological repository, essentially indefinitely. The canisters will be placed in so-called “buffer boxes” containing by bentonite clay, providing a fourth barrier.
World Nuclear News reports that although copper is highly resistant to corrosion, under anoxic conditions – that is, where no oxygen is present – sulphate-reducing bacteria have the potential to produce sulphide, which can lead to microbiologically induced corrosion (MIC) of copper. Waste management organisations and regulators therefore need to understand the levels of sulphide that will be present in a geological disposal facility, to understand its potential to migrate to the canister surface and the potential for it to cause copper corrosion, the NNL said.
The NWMO has been actively developing computer models that will be used to evaluate the potential for MIC once a disposal site has been selected, and has selected the NNL to carry out a peer review of its work because of the UK laboratory’s expertise in the biogeochemical processes that could affect repository performance and in developing computer modelling techniques that simulate the effects of sulphate-reducing bacteria. The work is linked closely with NNL’s participation in the European Commission Horizon-2020 MIND (Microbiology in Nuclear waste Disposal) project. (4
MKG, the Swedish NGO Office for Nuclear Waste Review has made an unofficial translation into English of the Swedish Environmental Court opinion on the power industry’s Nuclear Waste Company SKB’s license application for a final repository for spent nuclear fuel in Forsmark, Sweden.
The court said no to the application because it considered that there were problems with the copper canister that had to be resolved now and not later. The translation shows the courts judicial argumentation and why it decided not to accept the regulator SSM’s opinion that the problems with the integrity of the copper canister were not serious and could likely be solved at a later stage in the decision-making process.
The main difference between the court’s and the regulator’s decision-making was that the court decided to rely on a multitude of scientific sources and information and not only on the material provided by SKB. It had also been uncovered that the main corrosion expert at SSM did not want to say yes to the application at this time that may have influenced the court’s decision-making. In fact there appear to have been many dissenting voices in the regulator despite the regulator’s claim in the court that a united SSM stood behind its opinion.
The court underlines in its opinion that the Environmental Code requires that the repository should be shown to be safe at this stage in the decision-making process, i.e. before the government has its say. The court says that some uncertainties will always remain but it sees the possible copper canister problems as so serious that it is not clear that the regulator’s limits for release of radioactivity can be met. This is a reason to say no to the project unless it can be shown that the copper canister will work as intended. The copper canister has to provide isolation from the radioactivity in the spent nuclear fuel to humans and the environment for very long time-scales.
It is still unclear how the process will proceed. The community of Östhammar has cancelled the referendum on the repository, as there will be no question from the government in the near future. The government has set up a working group of civil servants to manage the government’s handling of the opinions delivered by the court and SSM. SSM has told the government that it is ok to say yes to the license application.
The court has stated that there are copper canister issues that need to be considered further. The nuclear waste company SKB has said that it is preparing documentation for the government to show that there are no problems with the canister. Whether the government thinks that this will be enough remains to be seen. This is likely not what the court had in mind. The government would be wise to make a much broader review of the issue. There is a need for a thorough judicial review on the governmental level in order to override the court’s opinion. Otherwise the government’ decision may not survive an appeal to the Supreme Administrative Court.
There are eminent corrosion experts that are of the opinion that copper is a bad choice as a canister material. There is also increasing experimental evidence that this is the case. One problem for the court was likely that SKB has hesitant to do the required corrosion studies that show that copper does not corrode in an anoxic repository environment. The 18-year FEBEX field test shows that copper corrodes relatively rapidly with pitting corrosion. SKB says that all corrosion is due to in-leaking oxygen but it is now clear that experimental systems containing copper and clay become anoxic within weeks or months so this explanation is not valid.
MKG has for long wanted SKB to retrieve the next experimental package in the LOT field test in the Äspö Hard Rock Laboratory. SKB had refused. The remaining packages have now been heated for 18 years. When a 5-year package was retrieved in 2006 it was discovered that there was “unexpectedly high corrosion”. There is clearly a need for more lab and field test results to decide whether copper is a good and safe choice for a canister material.
The court’s decision-making shows the importance of a democratic and open governance in environmental decision-making. It is important that the continued decision-making regarding the Swedish repository for spent nuclear is transparent and multi-faceted.
MKG 20th Feb 2018,Translation into English of the Swedish Environmental Court’s opinion on
the final repository for spent nuclear fuel – as well as some comments onthe decision and the further process. The court said no to the application because it considered that there were problems with the copper canister that had to be resolved now and not later.
The translation shows the court’s judicial argumentation and why it decided not to accept the regulator
SSM’s opinion that the problems with the integrity of the copper canister were not serious and could likely be solved at a later stage in the decision-making process.
The main difference between the court’s and the regulator’s decision-making was that the court decided to rely on a multitude of scientific sources and information and not only on the material provided by SKB.
Last month Cumbria Trust reported that the Swedish Environmental Court had blocked a licence application to construct a GDF for spent nuclear fuel after serious concerns were raised over the corrosion of the copper canisters used in the KBS-3 method. The same containment method is intended to be used in the UK. This court ruling was a success for MKG, the Swedish environmental organisation which receives government funding to act as a critical friend, scrutinising Sweden’s plan to bury nuclear waste.
MKG have now released some further details which show that the corrosion concerns are shared by experts within the Swedish regulator, SSM. While the nuclear industry, including the UK’s Radioactive Waste Management (RWM) seem keen to minimise the significance of this court ruling, by describing it as a delay and a request for more information, it appears the problem may be more fundamental, and could lead to this method of KBS-3 copper encapsulation being abandoned. This would damage the UK’s search process.
A key assumption with the KBS-3 method is that copper does not corrode in anoxic conditions, that is without the presence of oxygen. While there will be oxygen present at first, once the canisters are placed within the bentonite clay, bacteria and chemical processes consume the oxygen, creating the desired anoxic environment. However, it is becoming increasingly clear that even without oxygen, the copper begins to corrode by pitting. The heat generated by the spent fuel appears to be a significant factor in accelerating this pitting process. These capsules were intended to remain intact for a million years, but tests have suggested that they may well fail much sooner.
The significance of the problem goes well beyond this encapsulation method. There are lessons that should be learned, but the question is whether the nuclear industry will be open enough to do so. One key lesson is that funding a critical friend NGO such as MKG, can help to identify problems and reduce the impact of groupthink which leads to irrational decision-making. Another appears to be that we are prone to over-confidence in engineering. Isolating nuclear waste from the surface for a million years, particularly waste types which produce a great deal of heat, is complex. While we can test potential containment methods for around a generation, we need to be confident that these methods will continue to work for 30,000 generations.
“There is only one form of containment for liquids and gases which has been demonstrated to work for millions of years, even under great pressure, and that is geological formations. We have a vast quantity of evidence from the oil and gas industry of rock formations which have isolated hydrocarbons from the surface for many millions of years. So while Cumbria Trust continues to support the principle of geological disposal, as potentially the least bad solution to an existing problem, the key to its success must be the geology in which it is constructed.”
Any search process for a GDF site must begin with suitable geology and the failed attempts in Cumbria have concluded that the search should move to an area of simple geology and low groundwater flow. Cumbria Trust fears that the selective blindness which has led to the previous failures of the search process, will result in another attempt to target Cumbria despite its complex geology.
WNN 17 Feb 18 US-based GE Hitachi Nuclear Energy (GEH) has been awarded a three-year contract to dismantle the reactor internals of units 1 and 2 at the Oskarshamn nuclear power plant in Sweden
Under a contract signed with plant operator OKG AB on 19 December, Wilmington, North Carolina-based GEH will segment the reactor pressure vessel internals of both units. The work includes dismantling, cutting and packing the reactor internals for final disposal.
Segmentation of the reactor internals of Oskarshamn 2 is scheduled to begin in January 2018, with that of unit 1 set for 2019. The segmentation project is expected to be completed by the beginning of 2020.
Lance Hall, executive vice president of GEH’s nuclear services business, said today: “This is a breakthrough project for us in the decommissioning space in Europe and we look forward to drawing upon the many resources of the ‘GE Store’, including the depth of the global supply chain of GE and the former Alstom power businesses to deliver superior safety and cost efficient performance for our customer.”…….http://www.world-nuclear-news.org/WR-GE-Hitachi-to-dismantle-Oskarshamn-units-0301174.html
Radiation Free Lakeland 10th Feb 2018, On the 23rd January 2018 the Swedish Environment Court gave the thumbs down
to the Swedish equivalent (SKB) of the UK’s quango Radioactive Waste Management (RWM previously Managing Radioactive Wastes Safely previously
NIREX) tasked with implementing Geological Dumping of nuclear wastes.
The Swedish court said it could not recommend that their Government agree the application for a Geological Disposal Facility (Nuclear Underground Dump) unless and until the industry can prove that the copper capsules that would contain the spent nuclear fuels would not leak.
