Appendix D, Graphite Decommissioning: Options for Graphite Treatment, Recycling, or Disposal, including a discussion of Safety-Related Issues, EPRI, Palo Alto, CA, 1013091 (March 2006) ISF-2 is the world’s largest dry used fuel storage facility, accommodating 21,217 RBMK fuel assemblies in dry storage for at least a 100-year service life. The decision by the Belarus Council of Ministers resulted in a new national program over 2011-15 and up to 2020 to alleviate the Chernobyl impact and return the areas to normal use with minimal restrictions. Industrial Complex for Radwaste Management (ICSRM): In April 2009, Nukem handed over this turnkey waste treatment centre for solid radioactive waste. The New Safe Confinement (NSC) structure was completed in 2017, having been built adjacent and then moved into place on rails. The automatic emergency shutdown system and other safety features are subsequently turned off. The accident caused the largest uncontrolled radioactive release into the environment ever recorded for any civilian operation, and large quantities of radioactive substances were released into the air for about 10 days. Thirdly, €15 million for social projects. Compared with the list of contaminated areas in 2005, some 211 villages and hamlets had been reclassified with fewer restrictions on resettlement. Saved by Dark Side Of Me. Overall, some 21,484 dwellings are slated for connection to gas networks in the period 2011-2015, while about 5600 contaminated or broken down buildings are demolished. May 6, 1986: Radioactive emissions drop sharply, possibly because the fire in the core has burned itself out. Then, to 2046, further equipment will be removed, and by 2064 they will be demolished. Police officers assisting with the roadblock likewise have no knowledge of the radiation and wear no protective clothing. Later, the number of liquidators swelled to over 600,000, but most of these received only low radiation doses. The Chernobyl Shelter Fund, set up in 1997, had received €864 million from international donors by early 2011 towards this project and previous work. April 26, 1986, 2:15 a.m.: Local Soviet officials convene an emergency meeting at which they decide to block cars from exiting or entering Pripyat, a nearby city that was built to house Chernobyl’s workers. The report states that a quarter of the cases 2001-2008 were "probably" due to high doses of radiation, and that this fraction was likely to have been higher in earlier years, and lower in later years. (based on the proceedings of the IAEA/WHO/EC International Conference, Vienna, April 1996), International Atomic Energy Agency. This area of Ukraine is described as Belarussian-type woodland with a low population density. The extensions of the fuel channels penetrate the lower plate and the cover plate of the core and are welded to each. The report concluded: "In summary, the effects of the Chernobyl accident are many and varied. (Both are fission products dispersed from the reactor core, with half lives of 8 days and 30 years, respectively. The total cost of the new shelter was in 2011 estimated to be €1.5 billion. However, images obtained from inside the Pile several decades after the accident showed that the graphite was relatively undamaged. Graphic Violence ; Graphic Sexual Content ; texts. The Chernobyl Power Complex, lying about 130 km north of Kiev, Ukraine, and about 20 km south of the border with Belarus, consisted of four nuclear reactors of the RBMK-1000 design (see information page on RBMK Reactors). It could therefore be argued that the actions of the operators were more a symptom of the prevailing safety culture of the Soviet era rather than the result of recklessness or a lack of competence on the part of the operators. [Back], g. The International Chernobyl Project, 1990-91 - Assessment of Radiological Consequences and Evaluation of Protective Measures, Summary Brochure, published by the International Atomic Energy Agency, reports that, in June 1989, the World Health Organization (WHO) sent a team of experts to help address the health impacts of radioactive contamination resulting from the accident. In 2015 the published results of a major scientific study showed that the mammal population of the exclusion zone (including the 2162 sq km Polessian State Radiation-Ecological Reserve – PSRER in Belarus) was thriving, despite land contamination. Much has been made of the role of the operators in the Chernobyl accident. An extended version of this paper was published as Radiation folly, Chapter 4 of Environment & Health: Myths & Realities, Edited by Kendra Okonski and Julian Morris, International Policy Press (a division of International Policy Network), June 2004 (ISBN 1905041004). There is some dispute among experts about the character of this second explosion, but it is likely to have been caused by the production of hydrogen from zirconium-steam reactions. Chernobyl: 7 People Who Played a Crucial Role in the World's Worst Nuclear Disaster. The 1986 Summary Report on the Post-Accident Review Meeting on the Chernobyl Accident (INSAG-1) of the International Atomic Energy Agency's (IAEA's) International Nuclear Safety Advisory Group accepted the view of the Soviet experts that "the accident was caused by a remarkable range of human errors and violations of operating rules in combination with specific reactor features which compounded and amplified the effects of the errors and led to the reactivity excursion." EXPLOSIONS reportedly halted electricity generation at Belarusâs first nuclear power plant â a day after it was opened in a ceremony by embattled President Alexander Lukashenko. The first half, weighing 12,800 tonnes, was moved 112 metres to a holding area in front of unit 4 in April 2014. As steam production in the fuel channels increases, the neutrons that would have been absorbed by the denser water now produce increased fission in the fuel. Used fuel from units 1-3 was stored in each unit's cooling pond, and in an interim spent fuel storage facility pond (ISF-1). 4 is still intact. Experts believe it likewise caused thousands of premature cancer deaths, though the exact number is disputed. In February 2003, the IAEA established the Chernobyl Forum, in cooperation with seven other UN organisations as well as the competent authorities of Belarus, the Russian Federation, and Ukraine. Shrouded in secrecy, the incident was a watershed moment in both the Cold War and the history of nuclear power. et al., Long-term census data reveal abundant wildlife populations at Chernobyl, Current Biology, Volume 25, Issue 19, pR824–R826, Elsevier (5 October 2015) [Back] On April 26, 1986, the Chernobyl Nuclear Power Plant in the Soviet Union suffered a massive explosion that released radioactive material across Belarus, Russia and Ukraine, and as far as Scandinavia and western Europe. Almost 6000 people worked at the plant every day, and their radiation dose has been within internationally accepted limits. The design characteristics of the reactor were such that substantial damage to even three or four fuel assemblies would – and did – result in the destruction of the reactor. In the next step, these wastes, as well as those from decommissioning reactor blocks 1-3, are processed into a form suitable for permanent safe disposal. How can it happened, and what consequences the explosion caused. Thyroid cancer is usually not fatal if diagnosed and treated early; the report states that of the diagnoses made between 1991 and 2005 (6,848 cases), 15 proved to be fatal9. 1.8 EBq of I-131 and 0.085 EBq of Cs-137 were released.) flag. Chernobyl - A Continuing Catastrophe, United Nations Office for the Coordination of Humanitarian Affairs (OCHA), 2000 [Back] At 01:23:40 on 26 April 1986 a failed test led to the explosion of reactor 4 at the Chernobyl Nuclear Power Plant in Ukraine, then part of the Soviet Union, and the release into the atmosphere of parts of the radioactive core.. There are 187 communities that remain abandoned. The 2006 report of the UN Chernobyl Forum Expert Group "Health", Health Effects of the Chernobyl Accident and Special Health Care Programmes, states: "The Chernobyl accident caused the deaths of 30 power plant employees and firemen within a few days or weeks (including 28 deaths that were due to radiation exposure)." Of these, 28 people died as a result of ARS within a few weeks of the accident. On Chernobyl, the same source stated: "Graphite played little or no role in the progression or consequences of the accident. Mikhail Balonov, Malcolm Crick and Didier Louvat, Update of Impacts of the Chernobyl Accident: Assessments of the Chernobyl Forum (2003-2005) and UNSCEAR (2005-2008), Proceedings of the Third European IRPA (International Radiation Protection Association) Congress held in Helsinki, Finland (14-18 June 2010) [Back] Common ARS symptoms include gastrointestinal problems (e.g. They received high doses of radiation, averaging around 100 millisieverts (mSv). This entry was posted on October 4, 2009 at 12:14 pm, and is filed under Chernobyl Nuclear Accident, Nuclear Power Plants Accidents. About five million people lived in areas of Belarus, Russia and Ukraine contaminated (above 37 kBq/m2 Cs-137 in soil) and about 400,000 lived in more contaminated areas of strict control by authorities (above 555 kBq/m2 Cs-137). Various safety systems, such as an emergency core cooling system, were incorporated into the reactor design. The explosion occurred on April 26, 1986, during a routine maintenance check, according to U.N. Scientific Committee on the Effects of Atomic Radiation (UNSCEAR). HISTORY reviews and updates its content regularly to ensure it is complete and accurate. Furthermore, large areas of Belarus, Ukraine, Russia, and beyond were contaminated in varying degrees. Construction started in April 2012. Flag this item for. But the report goes on to say that the International Nuclear Safety Advisory Group "remains of the opinion that critical actions of the operators were most ill judged. Follow any responses to this post through RSS . April 27, 1986, 10 a.m.: Helicopters begin dumping sand, clay, boron, lead and dolomite into the burning core in an attempt to slow radioactive emissions. Evaluation of data on thyroid cancer in regions affected by the Chernobyl accident, UNSCEAR (2018) [Back], INSAG-7, The Chernobyl Accident: Updating of INSAG-1, A report by the International Nuclear Safety Advisory Group, International Atomic Energy Agency, Safety Series No. After the last Chernobyl reactor shut down in December 2000, in mid-2001 a new enterprise, SSE ChNPP was set up to take over management of the site and decommissioning from Energoatom. One person was killed immediately and a second died in hospital soon after as a result of injuries received. By now, the less-experienced night shift is on the job, which purportedly never received proper instructions on how to perform the test. destroyed reactor Unit 4 at the Chernobyl nuclear power station The destroyed reactor Unit 4 at the Chernobyl nuclear power station, Ukraine, U.S.S.R., April 26, 1986. Another contract has been let for a Liquid Radioactive Waste Treatment Plant (LRTP), to handle some 35,000 cubic metres of low- and intermediate-level liquid wastes at the site. A UN Development Program report in 2002 said that much of the aid and effort applied to mitigate the effects of the Chernobyl accident did more harm than good, and it seems that this, along with the Chernobyl Forum report, finally persuaded the Belarus authorities. There are also several referrals to a graphite fire occurring during the October 1957 accident at Windscale Pile No. Alternative generating capacity was needed, either gas-fired, which has ongoing fuel cost and supply implications, or nuclear, by completing Khmelnitski unit 2 and Rovno unit 4 ('K2R4') in Ukraine. During peak construction of the NSC some 1200 workers were onsite. They will then be transported to concrete dry storage vaults in which the fuel containers will be enclosed for up to 100 years. When one considers the chain of events leading up to the Chernobyl accident, why one person behaved in such a way and why another person behaved in another etc, it is impossible to find a single culprit, a single initiator of events, because it was like a closed circle." 4’s emergency core cooling system is disabled to keep it from interfering with the test. Ukraine depends upon, and is deeply in debt to, Russia for energy supplies, particularly oil and gas, but also nuclear fuel. Meanwhile, Soviet officials finally close schools in Kiev and advise residents to stay inside and to not eat leafy vegetables. The vertical pressure tubes contain the zirconium alloy clad uranium dioxide fuel around which the cooling water flows. In July 2010, the Belarus government announced that it had decided to settle back thousands of people in the 'contaminated areas' covered by the Chernobyl fallout, from which 24 years ago they and their forbears were hastily relocated. These initiatives are backed by funding arrangements. To the southeast of the plant, an artificial lake of some 22 square kilometres, situated beside the river Pripyat, a tributary of the Dniepr, was constructed to provide cooling water for the reactors. But if you see something that doesn't look right, click here to contact us! The main priority is agriculture and forestry, together with attracting qualified people and housing them. Recently the main resettlement project has been in Belarus. The number of deaths resulting from the accident are covered most fully in the account of health effects provided by an annex to the UNSCEAR 2008 report, released in 2011. EMBED. April 28, 1986: Swedish air monitors detect a large amount of radiation in the atmosphere, which is traced back to the USSR. About 200 tonnes of highly radioactive material remains deep within it, and this poses an environmental hazard until it is better contained. Remedying this presents daunting political problems however. Two more RBMK reactors were under construction at the site at the time of the accident. Below is a blow-by-blow account of how this catastrophic meltdown occurred. Here, an employee stands in front of a radiation sign at the sarcophagus a few years after its construction. In 2011 Chernobyl was officially declared a tourist attraction, with many visitors. A 55-page summary version the revised report, Chernobyl’s Legacy: Health, Environmental and Socio-Economic Impacts and Recommendations to the Governments of Belarus, the Russian Federation and Ukraine, The Chernobyl Forum: 2003–2005, Second revised version, as well as the Report of the UN Chernobyl Forum Expert Group “Environment” and the Report of the UN Chernobyl Forum Expert Group “Health” are available from the IAEA's webpage for the Chernobyl Forum (http://www-ns.iaea.org/meetings/rw-summaries/chernobyl_forum.htm) [Back], j. This task represents the most important step in eliminating nuclear hazard at the site – and the real start of dismantling. Some exaggerated figures have been published regarding the death toll attributable to the Chernobyl disaster, including a publication by the UN Office for the Coordination of Humanitarian Affairs (OCHA)6. The plant operators' town of Pripyat was evacuated on 27 April (45,000 residents). Construction of the plant has been completed and the start of operations was due late in 2015. There is however no question that extremely hot graphite was ejected from the core and at a temperature sufficient to ignite adjacent combustible materials. The International Chernobyl Project, 1990-91 - Assessment of Radiological Consequences and Evaluation of Protective Measures, Summary Brochure, International Atomic Energy Agency, IAEA/PI/A32E, 1991; The International Chernobyl Project, An Overview, Assessment of Radiological Consequences and Evaluation of Protective Measures, Report by an International Advisory Committee, IAEA, 1991 (ISBN: 9201290918); The International Chernobyl Project Technical Report, Assessment of Radiological Consequences and Evaluation of Protective Measures, Report by an International Advisory Committee, IAEA, 1991 (ISBN: 9201291914) [Back] It was a direct consequence of Cold War isolation and the resulting lack of any safety culture. Chernobyl Nuclear Plant â¢ Decommissioned nuclear power station near the city of Pripyat â¢ Four reactors of type RBMK-1000, each capable of producing 1.000MW â¢ It is known because of a explosion of a reactor due to different design failures and human errors It is estimated that all of the xenon gas, about half of the iodine and caesium, and at least 5% of the remaining radioactive material in the Chernobyl 4 reactor core (which had 192 tonnes of fuel) was released in the accident. The Belarus government decision was an important political landmark in an ongoing process. He later dies of radiation poisoning. The old town of Chornobyl, which had a population of 12,500, is about 15 km to the southeast of the complex. Despite all evidence to the contrary, the nuclear engineer in charge of the test insists that reactor No. Acute radiation syndrome (ARS) was originally diagnosed in 237 people onsite and involved with the clean-up and it was later confirmed in 134 cases. 42. Over 50 twinning arrangements between East and West nuclear plants have been put in place. Chernobyl New Safe Confinement under construction and before being moved into place (Image: EBRD). Most importantly, the physical characteristics of the reactor made possible its unstable behaviour." â¦ A safety test, which took place on April 26, 1986, at the Chernobyl nuclear power station, was deemed so routine that the plantâs director didnât even bother showing up. One of the most important characteristics of the RBMK reactor is that it can possess a 'positive void coefficient', where an increase in steam bubbles ('voids') is accompanied by an increase in core reactivity (see information page on RBMK Reactors). 1 in the UK. The disaster at Chernobyl Nuclear Power Plant remains the worst nuclear accident in global history in terms of lives lost and overall cost, with effects being felt even in recent times. It quickly spiraled out of control, however, as an unexpected power surge and steam buildup led to a series of explosions that blew apart the reactor. Chernobyl explosion: pictures of an exploded nuclear power plant Detailed authentic pictures of the explosion in Chernobyl. December 15, 2000: Unit 3, the last working reactor at Chernobyl, is shut down. The international Shelter Implementation Plan in the 1990s involved raising money for remedial work including removal of the fuel-containing materials. More information abot the details of disaster: investigation about the causes of the tragedy From the second to tenth day after the accident, some 5000 tonnes of boron, dolomite, sand, clay, and lead were dropped on to the burning core by helicopter in an effort to extinguish the blaze and limit the release of radioactive particles. Over 1300 kilometres of road will be laid, and ten new sewerage works and 15 pumping stations are planned. Two people were killed during the explosion and twenty-eight died from exposure shortly after. The Elephants Foot of the Chernobyl disaster in the immediate aftermath of the meltdown. ", However, the IAEA's 1992 INSAG-7 report, The Chernobyl Accident: Updating of INSAG-1, was less critical of the operators, with the emphasis shifted towards "the contributions of particular design features, including the design of the control rods and safety systems, and arrangements for presenting important safety information to the operators. Units 1 and 2 had been shut down in 1996 and 1991, respectively. See also Chernobyl Accident Appendix 2: Health Impacts, The chernobyl.info website www.chernobyl.info – out of date but some useful information, Chernobyl Forum information on IAEA website, Mikhail Balonov, The Chernobyl Forum: Major Findings and Recommendations, presented at the Public Information Materials Exchange meeting held in Vienna, Austria on 12-16 February 2006, GreenFacts webpage on Scientific Facts on the Chernobyl Nuclear Accident (www.greenfacts.org/en/chernobyl), European Centre of Technological Safety's Chernobyl website (www.tesec-int.org/Chernobyl) and its webpage on Sarcophagus and Decommissioning of the Chernobyl NPP, Chernobyl Legacy website (www.chernobyllegacy.com), David Mosey, Looking Beyond the Operator, Nuclear Engineering International, 26 Nov 2014, Chernobyl 25th anniversary, Frequently Asked Questions, World Health Organization (23 April 2011), © 2016-2020 World Nuclear Association, registered in England and Wales, number 01215741. (The US Three Mile Island accident in 1979 had a significant effect on Western reactor design and operating procedures. II, Ten Years after Chernobyl: what do we really know? Automated inspection equipment has also been installed. Following this, the Government of the USSR requested the International Atomic Energy Agency (IAEA) to coordinate an international experts' assessment of accident's radiological, environmental and health consequences in selected towns of the most heavily contaminated areas in Belarus, Russia, and Ukraine. In addition, highly radioactive and long-lived solid waste is sorted out for temporary separate storage. ISF-1 now holds most of the spent fuel from units 1-3, allowing those reactors to be decommissioned under less restrictive licence conditions. Two radionuclides, the short-lived iodine-131 and the long-lived caesium-137, were particularly significant for the radiation dose they delivered to members of the public. In 1986, an accident occurred at the Chernobyl nuclear power plant - the fourth power unit exploded. Land found to have too high a concentration of radionuclides will be reforested and managed. The storage area is designed to hold 55,000 m3 of treated waste which will be subject to radiological monitoring for 300 years, by when the radioactivity will have decayed to such an extent that monitoring is no longer required. The New York Times reported on the accident in its April 29 edition. "There is indeed no electricity generation at the nuclear power plant. This resettlement was due to application of a criterion of 350 mSv projected lifetime radiation dose, though in fact radiation in most of the affected area (apart from half a square kilometre close to the reactor) fell rapidly so that average doses were less than 50% above normal background of 2.5 mSv/yr. Radiation-induced leukemia has a latency period of 5-7 years, so any potential leukemia cases due to the accident would already have developed. [Back], l. A reinforced concrete casing was built around the ruined reactor building over the seven months following the accident. All of the RBMK reactors have now been modified by changes in the control rods, adding neutron absorbers and consequently increasing the fuel enrichment from 1.8 to 2.4% U-235, making them very much more stable at low power (see Post accident changes to the RBMK section in the information page on RBMK Reactors). The damaged Chernobyl unit 4 reactor building. FACT CHECK: We strive for accuracy and fairness. The “long-term empirical data showed no evidence of a negative influence of radiation on mammal abundance.” The data “represent unique evidence of wildlife's resilience in the face of chronic radiation stress.” (Current Biology, Elsevier8) . 5. The Chernobyl Forum report said that some seven million people are now receiving or eligible for benefits as 'Chernobyl victims', which means that resources are not targeting those most in need. April 26, 1986, 6:35 a.m.: By now, all fires have been extinguished except for a blaze in the reactor core, which will burn for days. Some "took on the role of invalids." Protective measures will be put in place for 498 settlements in the contaminated areas where average radiation dose may exceed 1 mSv per year. [Back], e. There have been fatalities in military and research reactor contexts, e.g. The casualties included firefighters who attended the initial fires on the roof of the turbine building. It was this effect which led to the uncontrolled power surge that led to the destruction of Chernobyl 4 (see Positive void coefficient section in the information page on RBMK Reactors). By the time that the operator moved to shut down the reactor, the reactor was in an extremely unstable condition. Printable Version Chernobyl History (Video) On this page: Background; Health Effects from the Accident; U.S. Reactors and NRC's Response; Discussion ; Sarcophagus; Information Resources; Background. August 25-29, 1986: The International Atomic Energy Agency hosts a conference at which scientists blame the accident not just on human error and a subpar safety culture, but also on Soviet reactor design flaws. However, at the time of the accident at Chernobyl 4, the reactor's fuel burn-up, control rod configuration, and power level led to a positive void coefficient large enough to overwhelm all other influences on the power coefficient. See also ASE keeps the lid on Chernobyl, World Nuclear News (19 August 2008). One further victim, due to coronary thrombosis, is widely reported, but does not appear on official lists of the initial deaths. The conclusions from Annex J of the UNSCEAR 2000 report are in Chernobyl Accident Appendix: Health Impacts [Back], k. The quoted comment comes from a 6 June 2000 letter from Lars-Erik Holm, Chairman of UNSCEAR and Director-General of the Swedish Radiation Protection Institute, to Kofi Annan, Secretary-General of the United Nations. Apart from the initial 116,000, relocations of people were very traumatic and did little to reduce radiation exposure, which was low anyway. The April 1986 disaster at the Chernobyla nuclear power plant in Ukraine was the product of a flawed Soviet reactor design coupled with serious mistakes made by the plant operatorsb. 7. Initial radiation exposure in contaminated areas was due to short-lived iodine-131; later caesium-137 was the main hazard. A suite of protective measures was set up to allow a new forestry industry whose products would meet national and international safety standards. [Back], m. The UNSCEAR committee in 20189 estimated that the fraction of the incidence of thyroid cancer attributable to radiation exposure among non-evacuated residents of Belarus, Ukraine and the four most contaminated oblasts of the Russian Federation, who were under 18 at the time of the accident, is in the order of 0.25. Oleg Sobolev, a consultant at the Belarus Emergency Ministry's department of nuclear and radiation safety, said: "The turbine is stopped. Leaving aside the verdict of history on its role in melting the Soviet 'Iron Curtain', some very tangible practical benefits have resulted from the Chernobyl accident. © 2020 A&E Television Networks, LLC. Residents are informed it will be temporary and that they should pack only vital documents and belongings, plus some food. Soviet officials admit that there’s been an accident, but they falsely state the situation is under control. Chernobyl Disaster: Causes and Solutions David Cabielles Hernández 2. In January 2008, the Ukraine government announced a four-stage decommissioning plan which incorporated the above waste activities and progresses towards a cleared site. Former President Gorbachev said that the Chernobyl accident was a more important factor in the fall of the Soviet Union than Perestroika – his program of liberal reform. It is a boiling light water reactor, with two loops feeding steam directly to the turbines, without an intervening heat exchanger. Chernobyl Disaster - Causes and Solutions 1. Universal History Archive/UIG/Getty Images. [Back], 1. Many other international programmes were initiated following Chernobyl. The Nuclear Safety Assistance Coordination Centre database lists Western aid totalling almost US$1 billion for more than 700 safety-related projects in former Eastern Bloc countries. (Unit 2 was shut down after a turbine hall fire in 1991, and unit 1 at the end of 1997.) In April 2005, the reports prepared by two expert groups – "Environment", coordinated by the IAEA, and "Health", coordinated by WHO – were intensively discussed by the Forum and eventually approved by consensus. April 2006: Gorbachev writes that the Chernobyl disaster, “even more than my launch of perestroika, was perhaps the real cause of the collapse of the Soviet Union.”. The overpressure caused the 1000 t cover plate of the reactor to become partially detached, rupturing the fuel channels and jamming all the control rods, which by that time were only halfway down. While no-one in the West was under any illusion about the safety of early Soviet reactor designs, some lessons learned have also been applicable to Western plants. Certainly the safety of all Soviet-designed reactors has improved vastly. In February 2014 a new stage of this was approved for units 1-3, involving dismantling some equipment and putting them into safstor condition by 2028. It was cooled by an engineered pond, which is fed by the Pripyat River about 5 kilometers northwest from its juncture with the Dnieper. The conclusions of this 2005 Chernobyl Forum study (revised version published 2006i) are in line with earlier expert studies, notably the UNSCEAR 2000 reportj which said that "apart from this [thyroid cancer] increase, there is no evidence of a major public health impact attributable to radiation exposure 14 years after the accident. READ MORE: The Chernobyl Coverup: How Officials Botched Evacuating an Irradiated City. Officials stressed there was no safety risk, but admitted power generation stopped at the Astravyets plant. Nobody offsite suffered from acute radiation effects although a significant, but uncertain, fraction of the thyroid cancers diagnosed since the accident in patients who were children at the time are likely to be due to intake of radioactive iodine falloutm,9. 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