Question: Cumbrians Opposed to a Radioactive Environment has campaigned against all aspects of the operation of Sellafield, formally known as which worst nuclear accident in Great Britain's history, ranked in severity at level 5 out of a possible 7 on the International Nuclear Event Scale? 

full_context: Document 1: Anti-nuclear movement in California: The 1970s proved to be a pivotal period for the anti-nuclear movement in California. Opposition to nuclear power in California coincided with the growth of the country's environmental movement. Opposition to nuclear power increased when President Richard Nixon called for the construction of 1000 nuclear plants by the year 2000.
Document 2: Hanford Site: The Hanford Site is a mostly decommissioned nuclear production complex operated by the United States federal government on the Columbia River in the U.S. state of Washington. The site has been known by many names, including: Hanford Project, Hanford Works, Hanford Engineer Works and Hanford Nuclear Reservation. Established in 1943 as part of the Manhattan Project in Hanford, south-central Washington, the site was home to the B Reactor, the first full-scale plutonium production reactor in the world. Plutonium manufactured at the site was used in the first nuclear bomb, tested at the Trinity site, and in Fat Man, the bomb detonated over Nagasaki, Japan.
Document 3: Koppers Co., Inc. (KCI) Superfund Site: The Koppers Co., Inc. (KCI) Superfund Site is one of three Superfund sites in Oroville, California, along with Louisiana Pacific Sawmill and Western Pacific Railyard. The KCI Superfund Site is a 200-acre site which served as a wood treatment plant for 50 years. Wood was treated with many chemicals to prevent wood deterioration. The accumulation of these chemicals from spills, fires, and uses has caused this site to be contaminated with hazardous waste material. Due to soil and groundwater contamination, the site was placed on the National Priorities List in 1984 for remedial action plans to clean up the site to protect surrounding residential areas concerning environmental and human health risks.
Document 4: Exide lead contamination: The Exide lead contamination, in southeast Los Angeles County, California, United States, came from a battery recycling plant that emitted lead, arsenic and other dangerous pollutants over decades that contaminated as many as 10,000 homes in half a dozen working-class, Latino communities near the plant. Exide Technologies, owner of the lead-acid battery smelter located in Vernon, agreed in 2015 to close the facility while the massive cleanup of the contaminated soil will take years and cost hundreds of millions of dollars. The residents have expressed outrage over the failure of state regulators to act as the plant was allowed to operate without a full permit while documented violations were occurring. The Department of Toxic Substances Control, which allowed the plant to operate, is in charge of the cleanup and is finding that the many residents do not trust them. The residents must give them permission to test the soil around their home yet many feel betrayed by this government agency.
Document 5: Windscale fire: The Windscale fire of 10 October 1957 was the worst nuclear accident in Great Britain's history, ranked in severity at level 5 out of a possible 7 on the International Nuclear Event Scale. The fire took place in Unit 1 of the two-pile Windscale facility on the northwest coast of England in Cumberland (now Sellafield, Cumbria). The two graphite-moderated reactors, referred to at the time as "piles", had been built as part of the British atomic bomb project. Windscale Pile No. 1 was operational in October 1950 followed by Pile No. 2 in June 1951.
Document 6: Nuclear Accident Magnitude Scale: The Nuclear Accident Magnitude Scale (NAMS) is a scale to measure the severity of a nuclear accident. It was proposed by the British nuclear safety expert David Smythe in 2011 as a response to the Fukushima Daiichi nuclear disaster, where the conventional International Nuclear Event Scale was used in a confusing manner. Furthermore, it wants to bridge the various shortcomings of INES.
Document 7: Three Mile Island accident: The Three Mile Island accident occurred on March 28, 1979, in reactor number 2 of Three Mile Island Nuclear Generating Station (TMI-2) in Dauphin County, Pennsylvania, United States, near Harrisburg. It was the most significant accident in U.S. commercial nuclear power plant history. The incident was rated a five on the seven-point International Nuclear Event Scale: Accident with wider consequences.
Document 8: B Reactor: The B Reactor at the Hanford Site, near Richland, Washington, was the first large-scale nuclear reactor ever built. The project was commissioned to produce plutonium-239 by neutron activation as part of the Manhattan Project, the United States nuclear weapons development program during World War II. The B reactor was fueled with metallic natural uranium, graphite moderated, and water-cooled. It has been designated a U.S. National Historic Landmark since August 19, 2008 and in July 2011 the National Park Service recommended that the B Reactor be included in the Manhattan Project National Historical Park commemorating the Manhattan Project. Visitors can take a tour of the reactor by advance reservation.
Document 9: Kyshtym disaster: The Kyshtym disaster was a radioactive contamination accident that occurred on 29 September 1957 at Mayak, a plutonium production site in Russia for nuclear weapons and nuclear fuel reprocessing plant of the Soviet Union. It measured as a Level 6 disaster on the International Nuclear Event Scale (INES), making it the third-most serious nuclear accident ever recorded, behind the Fukushima Daiichi nuclear disaster and the Chernobyl disaster (both Level 7 on the INES). The event occurred in Ozyorsk, Chelyabinsk Oblast, a closed city built around the Mayak plant, and spread hot particles over more than 20,000 sqmi , where at least 270,000 people lived, with 300 immediate deaths among the villagers nearby. Since Ozyorsk/Mayak (named Chelyabinsk-40, then Chelyabinsk-65, until 1994) was not marked on maps, the disaster was named after Kyshtym, the nearest known town.
Document 10: Nuclear power debate: The nuclear power debate is a long-running controversy about the risks and benefits of using nuclear reactors to generate electricity for civilian purposes. The debate about nuclear power peaked during the 1970s and 1980s, as more and more reactors were built and came online, and "reached an intensity unprecedented in the history of technology controversies" in some countries. Thereafter, the nuclear industry created jobs, focused on safety and public concerns mostly waned. In the last decade, however, with growing public awareness about climate change and the critical role that carbon dioxide and methane emissions play in causing the heating of the earth's atmosphere, there's been a resurgence in the intensity nuclear power debate once again. Nuclear power advocates and those who are most concerned about climate change point to nuclear power's reliable, emission-free, high-density energy and a generation of young physicists and engineers working to bring a new generation of nuclear technology into existence to replace fossil fuels. On the other hand, skeptics can point to two frightening nuclear accidents, the Chernobyl disaster in 1986 and subsequently the Fukushima Daiichi nuclear disaster, combined with escalating acts of global terrorism, to argue against continuing use of the technology. The debate continues today between those who fear the power of nuclear and those who fear what will happen to the earth if we don't use nuclear power. At the 1963 ground-breaking for what would become the world's largest nuclear power plant, President John F. Kennedy declared that nuclear power was a "step on the long road to peace," and that by using "science and technology to achieve significant breakthroughs" that we could "conserve the resources" to leave the world in better shape. Yet he also acknowledged that the Atomic Age was a "dreadful age" and "when we broke the atom apart, we changed the history of the world."
Document 11: Central Barrow: Central Barrow refers to the town centre of Barrow-in-Furness, Cumbria, England. Central Barrow is also the name of the electoral ward that covers roughly the eastern part of Barrow town centre. In 2001 5,584 (ranking 5th out of 13) lived in the Central ward. The population density was 55.96 per hectare, which was well above the local average of 9.24, and England average, 3.77. The population of Central ward had reduced to 4,583 at the 2011 Census. Central Barrow is amongst the 3% most deprived areas in the country and households have an average weekly income around £100 lower than the region's average, however the area being the central business district of the town is also home to many of Barrow's retail outlets, as well as a large amount of offices, restaurants and governmental buildings. Part of the multimillion-pound Waterfront Barrow-in-Furness is being constructed in the southern part of Central Barrow (including the new Marina Village).
Document 12: Jean McSorley: Jean McSorley is long-standing anti-nuclear campaigner, who formed the group "Cumbrians Against a Radioactive Environment" (Core) from her home town of Barrow-in-Furness, England in protest at the local Sellafield plant. As well as fighting compensation cases for Sellafield workers, Core took part in direct action campaigns. It has been incorrectly reported that they earned a string of injunctions.[1] Neither CORE as a group, nor the individuals involved, have received injunctions; but Greenpeace – who Jean McSorley subsequently worked for - has been served with a number due to its actions against nuclear operations.
Document 13: Institut für Nukleare Entsorgung: Nuclear Waste Institute is a large German research center at Karlsruhe Institute of Technology where R&D in the field of safe disposal of nuclear waste is being provided. Located 1 kilometer East from Linkenheim-Hochstetten.
Document 14: Battersea Power Station: Battersea Power Station is a decommissioned coal-fired power station located on the south bank of the River Thames, in Nine Elms, Battersea, an inner-city district of South West London. It comprises two individual power stations, built in two stages in the form of a single building. Battersea A Power Station was built in the 1930s, with Battersea B Power Station to the east in the 1950s. The two stations were built to a nearly identical design, providing the long-recognized four-chimney layout. The station ceased generating electricity in 1983, but over the past 50 years it has become one of the best known landmarks in London and is Grade II* listed. The station's celebrity owes much to numerous popular culture references, which include the cover art of Pink Floyd's 1977 album "Animals" and its appearance in the 1965 Beatles' film "Help!"
Document 15: Cumbrians Opposed to a Radioactive Environment: Cumbrians Opposed to a Radioactive Environment (CORE) is a non-political, non-profit organisation, located in Barrow-in-Furness, which since 1980 has campaigned against all aspects of the operation of Sellafield, formally Windscale and the site of the 1957 reactor fire. Issues of current interest are radioactive air and sea discharges, resultant environmental contamination, and the health detriment to local communities and wildlife. As well as preparing compensation cases for Sellafield workers, CORE has taken part in many direct action campaigns which have resulted in a string of injunctions.
ground_truth: Windscale