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dev-5026-94 | At the time there was still fear that the reactor could re-enter a self-sustaining nuclear chain-reaction and explode again, and a new containment structure was planned to prevent rain entering and triggering such an explosion, and to prevent further release of radioactive material. This was the largest civil engineeri... | dev-5026 | Chernobyl disaster | 94 | 52,673 | 53,299 |
dev-5026-95 | Many of the vehicles used by the liquidators remain parked in a field in the Chernobyl area.[113] | dev-5026 | Chernobyl disaster | 95 | 53,300 | 53,397 |
dev-5026-96 | During the construction of the sarcophagus, a scientific team re-entered the reactor as part of an investigation dubbed "Complex Expedition", to locate and contain nuclear fuel in a way that could not lead to another explosion. These scientists manually collected cold fuel rods, but great heat was still emanating from ... | dev-5026 | Chernobyl disaster | 96 | 53,398 | 53,954 |
dev-5026-97 | After six months of investigation, in December 1986, they discovered with the help of a remote camera an intensely radioactive mass in the basement of Unit Four, more than two metres wide and weighing hundreds of tons, which they called "the elephant's foot" for its wrinkled appearance.[114] The mass was composed of sa... | dev-5026 | Chernobyl disaster | 97 | 53,955 | 54,570 |
dev-5026-98 | Liquidators worked under deplorable conditions, poorly informed and with poor protection. Many, if not most of them, exceeded radiation safety limits.[88]:177–183[115]:2 Some exceeded limits by over 100 times—leading to rapid death.[88]:187 | dev-5026 | Chernobyl disaster | 98 | 54,571 | 54,811 |
dev-5026-99 | The official contaminated zones became stage to a massive clean-up effort lasting seven months.[88]:177–183 The official reason for such early (and dangerous) decontamination efforts, rather than allowing time for natural decay, was that the land must be re-peopled and brought back into cultivation. Indeed, within fift... | dev-5026 | Chernobyl disaster | 99 | 54,812 | 55,573 |
dev-5026-100 | There were two official explanations of the accident. | dev-5026 | Chernobyl disaster | 100 | 55,574 | 55,627 |
dev-5026-101 | The first official explanation of the accident, later acknowledged to be erroneous, was published in August 1986. It effectively placed the blame on the power plant operators. To investigate the causes of the accident the IAEA created a group known as the International Nuclear Safety Advisory Group (INSAG), which in it... | dev-5026 | Chernobyl disaster | 101 | 55,628 | 56,489 |
dev-5026-102 | The operator error was probably due to their lack of knowledge of nuclear reactor physics and engineering, as well as lack of experience and training. According to these allegations, at the time of the accident the reactor was being operated with many key safety systems turned off, most notably the Emergency Core Cooli... | dev-5026 | Chernobyl disaster | 102 | 56,490 | 57,087 |
dev-5026-103 | The developers of the reactor plant considered this combination of events to be impossible and therefore did not allow for the creation of emergency protection systems capable of preventing the combination of events that led to the crisis, namely the intentional disabling of emergency protection equipment plus the viol... | dev-5026 | Chernobyl disaster | 103 | 57,088 | 57,613 |
dev-5026-104 | In this analysis of the causes of the accident, deficiencies in the reactor design and in the operating regulations that made the accident possible were set aside and mentioned only casually. Serious critical observations covered only general questions and did not address the specific reasons for the accident. The foll... | dev-5026 | Chernobyl disaster | 104 | 57,614 | 58,194 |
dev-5026-105 | The reactor operators disabled safety systems down to the generators, which the test was really about. The main process computer, SKALA, was running in such a way that the main control computer could not shut down the reactor or even reduce power. Normally the reactor would have started to insert all of the control rod... | dev-5026 | Chernobyl disaster | 105 | 58,195 | 58,783 |
dev-5026-106 | On the subject of the disconnection of safety systems, Valery Legasov said, in 1987, that "[i]t was like airplane pilots experimenting with the engines in flight".[82] | dev-5026 | Chernobyl disaster | 106 | 58,784 | 58,951 |
dev-5026-107 | This view is reflected in numerous publications and also artistic works on the theme of the Chernobyl accident that appeared immediately after the accident,[43] and for a long time remained dominant in the public consciousness and in popular publications. | dev-5026 | Chernobyl disaster | 107 | 58,952 | 59,207 |
dev-5026-108 | Ukraine has declassified a number of KGB documents from the period between 1971 and 1988 related to the Chernobyl plant, mentioning for example previous reports of structural damages caused by negligence during construction of the plant (such as splitting of concrete layers) that were never acted upon. They document ov... | dev-5026 | Chernobyl disaster | 108 | 59,208 | 59,674 |
dev-5026-109 | In 1991 a Commission of the USSR State Committee for the Supervision of Safety in Industry and Nuclear Power reassessed the causes and circumstances of the Chernobyl accident and came to new insights and conclusions. Based on it, in 1992 the IAEA Nuclear Safety Advisory Group (INSAG) published an additional report, INS... | dev-5026 | Chernobyl disaster | 109 | 59,675 | 60,191 |
dev-5026-110 | In this INSAG report, most of the earlier accusations against staff for breach of regulations were acknowledged to be either erroneous, based on incorrect information obtained in August 1986, or less relevant. This report reflected another view of the main reasons for the accident, presented in Appendix I. According to... | dev-5026 | Chernobyl disaster | 110 | 60,192 | 60,979 |
dev-5026-111 | Human factors contributed to the conditions that led to the disaster. These included operating the reactor at a low power level—less than 700 MW—a level documented in the run-down test programme, and operating with a small operational reactivity margin (ORM). The 1986 assertions of Soviet experts notwithstanding, regul... | dev-5026 | Chernobyl disaster | 111 | 60,980 | 61,377 |
dev-5026-112 | However, regulations did forbid operating the reactor with a small margin of reactivity. Yet "post-accident studies have shown that the way in which the real role of the ORM is reflected in the Operating Procedures and design documentation for the RBMK-1000 is extremely contradictory", and furthermore, "ORM was not tre... | dev-5026 | Chernobyl disaster | 112 | 61,378 | 61,793 |
dev-5026-113 | According to the INSAG-7 Report, the chief reasons for the accident lie in the peculiarities of physics and in the construction of the reactor. There are two such reasons:[48]:18 | dev-5026 | Chernobyl disaster | 113 | 61,794 | 61,972 |
dev-5026-114 | While INSAG-1 and INSAG-7 reports both identified operator error as an issue of concern, the INSAG-7 identified that there numerous other issues that were contributing factors that lead to the incident. These contributing factors include:[121] | dev-5026 | Chernobyl disaster | 114 | 61,973 | 62,216 |
dev-5026-115 | Both views were heavily lobbied by different groups, including the reactor's designers, power plant personnel, and the Soviet and Ukrainian governments. According to the IAEA's 1986 analysis, the main cause of the accident was the operators' actions. But according to the IAEA's 1993 revised analysis the main cause was ... | dev-5026 | Chernobyl disaster | 115 | 62,217 | 62,827 |
dev-5026-116 | Once again, the human factor had to be considered as a major element in causing the accident. INSAG notes that both the operating regulations and staff handled the disabling of the reactor protection easily enough: witness the length of time for which the ECCS was out of service while the reactor was operated at half p... | dev-5026 | Chernobyl disaster | 116 | 62,828 | 63,466 |
dev-5026-117 | As in the previously released report INSAG-1, close attention is paid in report INSAG-7 to the inadequate (at the moment of the accident) "culture of safety" at all levels. Deficiency in the safety culture was inherent not only at the operational stage but also, and to no lesser extent, during activities at other stage... | dev-5026 | Chernobyl disaster | 117 | 63,467 | 64,301 |
dev-5026-118 | Although no informing comparisons can be made between the accident and a strictly air burst-fuzed nuclear detonation, it has still been approximated that about four hundred times more radioactive material was released from Chernobyl than by the atomic bombing of Hiroshima and Nagasaki. By contrast the Chernobyl acciden... | dev-5026 | Chernobyl disaster | 118 | 64,302 | 65,186 |
dev-5026-119 | The initial evidence that a major release of radioactive material was affecting other countries came not from Soviet sources, but from Sweden. On the morning of 28 April[127] workers at the Forsmark Nuclear Power Plant (approximately 1,100 km (680 mi) from the Chernobyl site) were found to have radioactive particles on... | dev-5026 | Chernobyl disaster | 119 | 65,187 | 65,527 |
dev-5026-120 | It was Sweden's search for the source of radioactivity, after they had determined there was no leak at the Swedish plant, that at noon on 28 April led to the first hint of a serious nuclear problem in the western Soviet Union. Hence the evacuation of Pripyat on 27 April, 36 hours after the initial explosions, was silen... | dev-5026 | Chernobyl disaster | 120 | 65,528 | 66,070 |
dev-5026-121 | Contamination from the Chernobyl accident was scattered irregularly depending on weather conditions, much of it deposited on mountainous regions such as the Alps, the Welsh mountains and the Scottish Highlands, where adiabatic cooling caused radioactive rainfall. The resulting patches of contamination were often highly... | dev-5026 | Chernobyl disaster | 121 | 66,071 | 66,643 |
dev-5026-122 | Rain was purposely seeded over 10,000Â km2 of the Belorussian SSR by the Soviet air force to remove radioactive particles from clouds heading toward highly populated areas. Heavy, black-coloured rain fell on the city of Gomel.[132] Reports from Soviet and Western scientists indicate that Belarus received about 60% of t... | dev-5026 | Chernobyl disaster | 122 | 66,644 | 67,358 |
dev-5026-123 | Recently published data from a long-term monitoring program (The Korma Report II)[134] shows a decrease in internal radiation exposure of the inhabitants of a region in Belarus close to Gomel. Resettlement may even be possible in prohibited areas provided that people comply with appropriate dietary rules. | dev-5026 | Chernobyl disaster | 123 | 67,359 | 67,665 |
dev-5026-124 | In Western Europe, precautionary measures taken in response to the radiation included seemingly arbitrary regulations banning the importation of certain foods but not others. In France some officials stated that the Chernobyl accident had no adverse effects.[135] Official figures in southern Bavaria in Germany indicate... | dev-5026 | Chernobyl disaster | 124 | 67,666 | 68,269 |
dev-5026-125 | Like many other releases of radioactivity into the environment, the Chernobyl release was controlled by the physical and chemical properties of the radioactive elements in the core. Particularly dangerous are the highly radioactive fission products, those with high nuclear decay rates that accumulate in the food chain,... | dev-5026 | Chernobyl disaster | 125 | 68,270 | 68,770 |
dev-5026-126 | Detailed reports on the release of radioisotopes from the site were published in 1989[137] and 1995,[138] with the latter report updated in 2002.[2] | dev-5026 | Chernobyl disaster | 126 | 68,771 | 68,919 |
dev-5026-127 | At different times after the accident, different isotopes were responsible for the majority of the external dose. The remaining quantity of any radioisotope, and therefore the activity of that isotope, after 7 decay half-lives have passed, is less than 1% of its initial magnitude,[139] and it continues to reduce beyond... | dev-5026 | Chernobyl disaster | 127 | 68,920 | 69,629 |
dev-5026-128 | Two sizes of particles were released: small particles of 0.3 to 1.5 micrometres (aerodynamic diameter) and large particles of 10 micrometres. The large particles contained about 80% to 90% of the released nonvolatile radioisotopes zirconium-95, niobium-95, lanthanum-140, cerium-144 and the transuranic elements, includi... | dev-5026 | Chernobyl disaster | 128 | 69,630 | 70,034 |
dev-5026-129 | The dose that was calculated is the relative external gamma dose rate for a person standing in the open. The exact dose to a person in the real world who would spend most of their time sleeping indoors in a shelter and then venturing out to consume an internal dose from the inhalation or ingestion of a radioisotope, re... | dev-5026 | Chernobyl disaster | 129 | 70,035 | 70,422 |
dev-5026-130 | The Chernobyl nuclear power plant is located next to the Pripyat River, which feeds into the Dnieper reservoir system, one of the largest surface water systems in Europe, which at the time supplied water to Kiev's 2.4 million residents, and was still in spring flood when the accident occurred.[144]:60 The radioactive c... | dev-5026 | Chernobyl disaster | 130 | 70,423 | 71,816 |
dev-5026-131 | Bio-accumulation of radioactivity in fish[146] resulted in concentrations (both in western Europe and in the former Soviet Union) that in many cases were significantly above guideline maximum levels for consumption.[145] Guideline maximum levels for radiocaesium in fish vary from country to country but are approximatel... | dev-5026 | Chernobyl disaster | 131 | 71,817 | 72,305 |
dev-5026-132 | In small "closed" lakes in Belarus and the Bryansk region of Russia, concentrations in a number of fish species varied from 100 to 60,000 Bq/kg during the period 1990–92.[148] The contamination of fish caused short-term concern in parts of the UK and Germany and in the long term (years rather than months) in the affect... | dev-5026 | Chernobyl disaster | 132 | 72,306 | 72,707 |
dev-5026-133 | Groundwater was not badly affected by the Chernobyl accident since radionuclides with short half-lives decayed away long before they could affect groundwater supplies, and longer-lived radionuclides such as radiocaesium and radiostrontium were adsorbed to surface soils before they could transfer to groundwater.[149] Ho... | dev-5026 | Chernobyl disaster | 133 | 72,708 | 73,471 |
dev-5026-134 | After the disaster, four square kilometres of pine forest directly downwind of the reactor turned reddish-brown and died, earning the name of the "Red Forest".[150] Some animals in the worst-hit areas also died or stopped reproducing. Most domestic animals were removed from the exclusion zone, but horses left on an isl... | dev-5026 | Chernobyl disaster | 134 | 73,472 | 74,082 |
dev-5026-135 | A robot sent into the reactor itself has returned with samples of black, melanin-rich radiotrophic fungi that are growing on the reactor's walls.[154] | dev-5026 | Chernobyl disaster | 135 | 74,083 | 74,233 |
dev-5026-136 | Of the 440,350 wild boar killed in the 2010 hunting season in Germany, over 1000 were found to be contaminated with levels of radiation above the permitted limit of 600 becquerels per kilogram, due to residual radioactivity from Chernobyl.[155] | dev-5026 | Chernobyl disaster | 136 | 74,234 | 74,478 |
dev-5026-137 | The Norwegian Agricultural Authority reported that in 2009 a total of 18,000 livestock in Norway needed to be given uncontaminated feed for a period of time before slaughter in order to ensure that their meat was safe for human consumption. This was due to residual radioactivity from Chernobyl in the plants they graze ... | dev-5026 | Chernobyl disaster | 137 | 74,479 | 75,144 |
dev-5026-138 | The after-effects of Chernobyl were expected to be seen for a further 100 years, although the severity of the effects would decline over that period.[157] Scientists report this is due to radioactive caesium-137 isotopes being taken up by fungi such as Cortinarius caperatus which is in turn eaten by sheep whilst grazin... | dev-5026 | Chernobyl disaster | 138 | 75,145 | 75,472 |
dev-5026-139 | The United Kingdom was forced to restrict the movement of sheep from upland areas when radioactive caesium-137 fell across parts of Northern Ireland, Wales, Scotland and northern England. In the immediate aftermath of the disaster in 1986, a total of 4,225,000 sheep had their movement restricted across a total of 9,700... | dev-5026 | Chernobyl disaster | 139 | 75,473 | 76,357 |
dev-5026-140 | The legislation used to control sheep movement and compensate farmers (farmers were latterly compensated per animal to cover additional costs in holding animals prior to radiation monitoring) was revoked during October and November 2012 by the relevant authorities in the UK.[161] | dev-5026 | Chernobyl disaster | 140 | 76,358 | 76,638 |
dev-5026-141 | In the aftermath of the accident, 237 people suffered from acute radiation sickness (ARS), of whom 31 died within the first three months.[32][162] | dev-5026 | Chernobyl disaster | 141 | 76,639 | 76,785 |
dev-5026-142 | In 2005 the Chernobyl Forum, composed of the IAEA, other UN organizations and the governments of Belarus, Russia and Ukraine, published a report on the radiological environmental and health consequences of the Chernobyl accident. | dev-5026 | Chernobyl disaster | 142 | 76,786 | 77,015 |
dev-5026-143 | On the death toll of the accident, the report states that 28 emergency workers ("liquidators") died from acute radiation syndrome, including beta burns, and 15 patients died from thyroid cancer in the following years, and it roughly estimated that cancer deaths caused by Chernobyl may reach a total of about 4,000 among... | dev-5026 | Chernobyl disaster | 143 | 77,016 | 77,928 |
dev-5026-144 | Of all 66,000 Belarusian emergency workers, by the mid-1990s only 150 (roughly 0.2%) were reported by their government as having died. In contrast, 5,722 casualties were reported among Ukrainian clean-up workers up to the year 1995, by the National Committee for Radiation Protection of the Ukrainian Population.[164][12... | dev-5026 | Chernobyl disaster | 144 | 77,929 | 78,251 |
dev-5026-145 | The four most harmful radionuclides spread from Chernobyl were iodine-131, caesium-134, caesium-137 and strontium-90, with half-lives of 8.02 days, 2.07 years, 30.2 years and 28.8 years respectively.[165]:8 The iodine was initially viewed with less alarm than the other isotopes, because of its short half-life, but it i... | dev-5026 | Chernobyl disaster | 145 | 78,252 | 79,412 |
dev-5026-146 | By the year 2000, the number of Ukrainians claiming to be radiation'sufferers' (poterpili) and receiving state benefits had jumped to 3.5 million, or 5% of the population. Many of these are populations resettled from contaminated zones, or former or current Chernobyl plant workers.[115]:4–5 According to IAEA-affiliat... | dev-5026 | Chernobyl disaster | 146 | 79,413 | 80,081 |
dev-5026-147 | The World Health Organization states, "children conceived before or after their father's exposure showed no statistically significant differences in mutation frequencies".[170] This statistically insignificant increase was also seen by independent researchers analyzing the children of the Chernobyl liquidators.[171] | dev-5026 | Chernobyl disaster | 147 | 80,082 | 80,399 |
dev-5026-148 | On farms in Narodychi Raion of Ukraine it is claimed that in the first four years of the disaster nearly 350 animals were born with gross deformities such as missing or extra limbs, missing eyes, heads or ribs, or deformed skulls; in comparison, only three abnormal births had been registered in the five years prior.[17... | dev-5026 | Chernobyl disaster | 148 | 80,400 | 81,703 |
dev-5026-149 | In 1996, geneticist colleagues Ronald Chesser and Robert Baker published a paper on the thriving vole population within the exclusion zone, in which the central conclusion of their work was essentially that "The mutation rate in these animals is hundreds and probably thousands of times greater than normal", this claim ... | dev-5026 | Chernobyl disaster | 149 | 81,704 | 82,556 |
dev-5026-150 | Following the accident, journalists mistrusted many medical professionals (such as the spokesman from the UK National Radiological Protection Board), and in turn encouraged the public to mistrust them.[186] Throughout the European continent, due to this media-driven framing of the slight contamination and in nations wh... | dev-5026 | Chernobyl disaster | 150 | 82,557 | 83,700 |
dev-5026-151 | Worldwide, an estimated excess of about 150,000 elective abortions may have been performed on otherwise healthy pregnancies out of unfounded fears of radiation from Chernobyl, according to Dr Robert Baker and ultimately a 1987 article published by Linda E. Ketchum in the Journal of Nuclear Medicine which mentions but d... | dev-5026 | Chernobyl disaster | 151 | 83,701 | 84,098 |
dev-5026-152 | The available statistical data excludes the Soviet/Ukraine/Belarus abortion rates, as they are presently unavailable. From the available data, an increase in the number of abortions in what were healthy developing human offspring in Denmark occurred in the months following the accident, at a rate of about 400 cases.[18... | dev-5026 | Chernobyl disaster | 152 | 84,099 | 84,630 |
dev-5026-153 | As the increase in radiation in Denmark was so low...the public debate and anxiety among the pregnant women and their husbands "caused" more fetal deaths in Denmark than the accident. This underlines the importance of public debate, the role of the mass media and of the way in which National Health authorities particip... | dev-5026 | Chernobyl disaster | 153 | 84,631 | 84,970 |
dev-5026-154 | No evidence of changes in the prevalence of human deformities/birth congenital anomalies which might be associated with the accident, are apparent in Belarus or the Ukraine, the two republics which had the highest exposure to fallout.[194] In Sweden,[195] and Finland where no increase in abortion rates occurred, it was... | dev-5026 | Chernobyl disaster | 154 | 84,971 | 86,303 |
dev-5026-155 | In very high doses, it was known at the time that radiation can cause a physiological increase in the rate of pregnancy anomalies, but unlike the dominant linear-no threshold model of radiation and cancer rate increases, it was known, by researchers familiar with both the prior human exposure data and animal testing, t... | dev-5026 | Chernobyl disaster | 155 | 86,304 | 87,573 |
dev-5026-156 | The Chernobyl liquidators, essentially an all male civil defense emergency workforce, would go on to father normal children, without an increase in developmental anomalies or a statistically significant increase in the frequencies of germline mutations in their progeny.[171] This normality is similarly seen in the chil... | dev-5026 | Chernobyl disaster | 156 | 87,574 | 87,944 |
dev-5026-157 | Due in largest part from the ingestion of contaminated dairy products along with the inhalation of the short-lived and therefore highly radioactive isotope, Iodine-131, the 2005 UN collaborative Chernobyl Forum revealed thyroid cancer among children to be one of the main health impacts from the Chernobyl accident. In t... | dev-5026 | Chernobyl disaster | 157 | 87,945 | 88,621 |
dev-5026-158 | According to UNSCEAR, up to the year 2005, an excess of over 6000 cases of thyroid cancer have been reported. That is, over the estimated pre-accident baseline thyroid cancer rate, more than 6000 casual cases of thyroid cancer have been reported in children and adolescents exposed at the time of the accident, a number ... | dev-5026 | Chernobyl disaster | 158 | 88,622 | 89,076 |
dev-5026-159 | Well-differentiated thyroid cancers are generally treatable,[203] and when treated the five-year survival rate of thyroid cancer is 96%, and 92% after 30 years.[204] UNSCEAR had reported 15 deaths from thyroid cancer in 2011.[205] The International Atomic Energy Agency (IAEA) also states that there has been no increase... | dev-5026 | Chernobyl disaster | 159 | 89,077 | 89,823 |
dev-5026-160 | The German affiliate of the ultra-anti-nuclear energy organization, the International Physicians for the Prevention of Nuclear War (IPPNW) attempt to suggest that 10,000 people are affected by thyroid cancer as of 2006 and that 50,000 cases are expected in the future.[210] | dev-5026 | Chernobyl disaster | 160 | 89,824 | 90,097 |
dev-5026-161 | Fred Mettler, a radiation expert at the University of New Mexico, puts the number of worldwide cancer deaths outside the highly contaminated zone at "perhaps" 5000, for a total of 9000 Chernobyl-associated fatal cancers, saying "the number is small (representing a few percent) relative to the normal spontaneous risk of... | dev-5026 | Chernobyl disaster | 161 | 90,098 | 90,745 |
dev-5026-162 | The report went into depth about the risks to mental health of exaggerated fears about the effects of radiation.[163] According to the IAEA the "designation of the affected population as "victims" rather than "survivors" has led them to perceive themselves as helpless, weak and lacking control over their future". The I... | dev-5026 | Chernobyl disaster | 162 | 90,746 | 91,155 |
dev-5026-163 | Fred Mettler commented that 20 years later: "The population remains largely unsure of what the effects of radiation actually are and retain a sense of foreboding. A number of adolescents and young adults who have been exposed to modest or small amounts of radiation feel that they are somehow fatally flawed and there is... | dev-5026 | Chernobyl disaster | 163 | 91,156 | 91,876 |
dev-5026-164 | The United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR), part of the Chernobyl Forum, have produced their own assessments of the radiation effects.[214] UNSCEAR was set up as a collaboration between various United Nation bodies, including the World Health Organization, after the atomic bomb... | dev-5026 | Chernobyl disaster | 164 | 91,877 | 92,299 |
dev-5026-165 | The number of potential deaths arising from the Chernobyl disaster is heavily debated. The WHO's prediction of 4000 future cancer deaths in surrounding countries[216] is based on the Linear no-threshold model (LNT), which assumes that the damage inflicted by radiation at low doses is directly proportional to the dose.[... | dev-5026 | Chernobyl disaster | 165 | 92,300 | 92,783 |
dev-5026-166 | According to the Union of Concerned Scientists the number of excess cancer deaths worldwide (including all contaminated areas) is approximately 27,000 based on the same LNT.[219] | dev-5026 | Chernobyl disaster | 166 | 92,784 | 92,962 |
dev-5026-167 | Another study critical of the Chernobyl Forum report was commissioned by Greenpeace, which asserted that the most recently published figures indicate that in Belarus, Russia and Ukraine the accident could have resulted in 10,000–200,000 additional deaths in the period between 1990 and 2004.[39] The Scientific Secretary... | dev-5026 | Chernobyl disaster | 167 | 92,963 | 93,678 |
dev-5026-168 | Chernobyl: Consequences of the Catastrophe for People and the Environment is a 2007 Russian publication that concludes that there were 985,000 premature deaths as a result of the radioactivity released.[221] The results were criticized by M. I. Balonov of the Institute of Radiation Hygiene in St. Petersburg, who descri... | dev-5026 | Chernobyl disaster | 168 | 93,679 | 94,406 |
dev-5026-169 | According to Kenneth Mossman, a Professor of Health Physics and member of the U.S. Nuclear Regulatory Commission advisory committee,[222] the "LNT philosophy is overly conservative, and low-level radiation may be less dangerous than commonly believed".[223] Yoshihisa Matsumoto, a radiation biologist at the Tokyo Instit... | dev-5026 | Chernobyl disaster | 169 | 94,407 | 95,130 |
dev-5026-170 | Another significant issue is establishing consistent data on which to base the analysis of the impact of the Chernobyl accident. Since 1991 large social and political changes have occurred within the affected regions and these changes have had significant impact on the administration of health care, on socio-economic s... | dev-5026 | Chernobyl disaster | 170 | 95,131 | 95,776 |
dev-5026-171 | It is difficult to establish the total economic cost of the disaster. According to Mikhail Gorbachev, the Soviet Union spent 18 billion rubles (the equivalent of US$18 billion at that time) on containment and decontamination, virtually bankrupting itself.[4] In Belarus the total cost over 30 years is estimated at US$23... | dev-5026 | Chernobyl disaster | 171 | 95,777 | 96,623 |
dev-5026-172 | A significant economic impact at the time was the removal of 784,320 ha (1,938,100 acres) of agricultural land and 694,200 ha (1,715,000 acres) of forest from production. While much of this has been returned to use, agricultural production costs have risen due to the need for special cultivation techniques, fertilizers... | dev-5026 | Chernobyl disaster | 172 | 96,624 | 96,964 |
dev-5026-173 | Politically, the accident gave great significance to the new Soviet policy of glasnost,[225][226] and helped forge closer Soviet–US relations at the end of the Cold War, through bioscientific cooperation.[227]:44–48 The disaster also became a key factor in the Union's eventual 1991 dissolution, and a major influence in... | dev-5026 | Chernobyl disaster | 173 | 96,965 | 97,328 |
dev-5026-174 | Both Ukraine and Belarus, in their first months of independence, lowered legal radiation thresholds from the Soviet Union's previous, elevated thresholds (from 35 rems per lifetime under the USSR to 7 rems per lifetime in Ukraine and 0.1 rems per year in Belarus).[228]:46–7,119–124 This required an expansion of territo... | dev-5026 | Chernobyl disaster | 174 | 97,329 | 98,785 |
dev-5026-175 | Following the accident, questions arose about the future of the plant and its eventual fate. All work on the unfinished reactors 5 and 6 was halted three years later. However, the trouble at the Chernobyl plant did not end with the disaster in reactor 4. The damaged reactor was sealed off and 200 cubic meters (260 cu y... | dev-5026 | Chernobyl disaster | 175 | 98,786 | 99,463 |
dev-5026-176 | In October 1991, a fire broke out in the turbine building of reactor 2;[229] the authorities subsequently declared the reactor damaged beyond repair, and it was taken offline. Reactor 1 was decommissioned in November 1996 as part of a deal between the Ukrainian government and international organizations such as the IAE... | dev-5026 | Chernobyl disaster | 176 | 99,464 | 99,960 |
dev-5026-177 | The Chernobyl reactor is now enclosed in a large concrete sarcophagus, which was built quickly to allow continuing operation of the other reactors at the plant.[9] | dev-5026 | Chernobyl disaster | 177 | 99,961 | 100,124 |
dev-5026-178 | A New Safe Confinement was to have been built by the end of 2005; however, it has suffered ongoing delays and as of 2010[update], when construction finally began, was expected to be completed in 2013. This was delayed again to 2016, the end of the 30-year lifespan of the sarcophagus. The structure was built adjacent to... | dev-5026 | Chernobyl disaster | 178 | 100,125 | 100,975 |
dev-5026-179 | As of 29 November 2016, Reactor No. 4 has been covered by the New Safe Confinement that covers the reactor and the unstable “sarcophagus”.[231] The huge steel arch was moved into place over several weeks, and the completion of this procedure was celebrated with a ceremony at the site, attended by the Ukrainian presiden... | dev-5026 | Chernobyl disaster | 179 | 100,976 | 101,495 |
dev-5026-180 | By 2002, roughly 15,000 Ukrainian workers were still working within the Zone of Exclusion, maintaining the plant and performing other containment- and research-related tasks, often in dangerous conditions.[227]:2 A handful of Ukrainian scientists work inside the sarcophagus, but outsiders are rarely granted access. In ... | dev-5026 | Chernobyl disaster | 180 | 101,496 | 102,001 |
dev-5026-181 | On 12 February 2013, a 600 m2 (6,500 sq ft) section of the roof of the turbine-building, adjacent to the sarcophagus, collapsed. At first it was assumed that the roof collapsed because of the weight of snow on it. However the amount of snow was not exceptional, and the report of a Ukrainian fact-finding panel concluded... | dev-5026 | Chernobyl disaster | 181 | 102,002 | 103,602 |
dev-5026-182 | As of 2006[update], some fuel remained in the reactors at units 1 through 3, most of it in each unit's spent fuel pool, as well as some material in a small spent fuel interim storage facility pond (ISF-1). | dev-5026 | Chernobyl disaster | 182 | 103,603 | 103,808 |
dev-5026-183 | In 1999 a contract was signed for construction of a radioactive waste management facility to store 25,000 used fuel assemblies from units 1–3 and other operational wastes, as well as material from decommissioning units 1–3 (which will be the first RBMK units decommissioned anywhere). The contract included a processing ... | dev-5026 | Chernobyl disaster | 183 | 103,809 | 104,268 |
dev-5026-184 | The canisters were to be transported to dry storage vaults, where the fuel containers would be enclosed for up to 100 years. This facility, treating 2500 fuel assemblies per year, would be the first of its kind for RBMK fuel. However, after a significant part of the storage structures had been built, technical deficien... | dev-5026 | Chernobyl disaster | 184 | 104,269 | 104,768 |
dev-5026-185 | Another contract has been let for a liquid radioactive waste treatment plant, to handle some 35,000 cubic meters of low- and intermediate-level liquid wastes at the site. This will need to be solidified and eventually buried along with solid wastes on site.[citation needed] | dev-5026 | Chernobyl disaster | 185 | 104,769 | 105,043 |
dev-5026-186 | In January 2008, the Ukrainian government announced a 4-stage decommissioning plan that incorporates the above waste activities and progresses towards a cleared site.[133] | dev-5026 | Chernobyl disaster | 186 | 105,044 | 105,215 |
dev-5026-187 | According to official estimates, about 95% of the fuel in Reactor 4 at the time of the accident (about 180 metric tons) remains inside the shelter, with a total radioactivity of nearly 18 million curies (670 PBq). The radioactive material consists of core fragments, dust, and lava-like "fuel containing materials" (FCM)... | dev-5026 | Chernobyl disaster | 187 | 105,216 | 105,644 |
dev-5026-188 | Three different lavas are present in the basement of the reactor building: black, brown, and a porous ceramic. The lava materials are silicate glasses with inclusions of other materials within them. The porous lava is brown lava that dropped into water and thus cooled rapidly. | dev-5026 | Chernobyl disaster | 188 | 105,645 | 105,922 |
dev-5026-189 | It is unclear how long the ceramic form will retard the release of radioactivity. From 1997 to 2002 a series of published papers suggested that the self-irradiation of the lava would convert all 1,200 metric tons into a submicrometre and mobile powder within a few weeks.[236] But it has been reported that the degradati... | dev-5026 | Chernobyl disaster | 189 | 105,923 | 106,638 |
dev-5026-190 | Some of the surfaces of the lava flows have started to show new uranium minerals such as čejkaite (Na
4(UO
2)(CO
3)
3)[238] and uranyl carbonate. However, the level of radioactivity is such that during 100 years, the lava's self irradiation (7016200000000000000♠2×1016 α decays per gram and 2 to 7005500000000000000♠5×10... | dev-5026 | Chernobyl disaster | 190 | 106,639 | 107,250 |
dev-5026-191 | An area originally extending 30 kilometres (19Â mi) in all directions from the plant is officially called the "zone of alienation". It is largely uninhabited, except for about 300 residents who have refused to leave. The area has largely reverted to forest, and has been overrun by wildlife because of a lack of competit... | dev-5026 | Chernobyl disaster | 191 | 107,251 | 108,006 |
dev-5026-192 | In 2011 Ukraine opened up the sealed zone around the Chernobyl reactor to tourists who wish to learn more about the tragedy that occurred in 1986.[240][241] | dev-5026 | Chernobyl disaster | 192 | 108,007 | 108,163 |
dev-5026-193 | If the forests that have been contaminated by radioactive material catch on fire, they will spread the radioactive material further outwards in the smoke.[242][243] | dev-5026 | Chernobyl disaster | 193 | 108,164 | 108,328 |
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