During a planned decrease of reactor power in preparation for the test, the power output unexpectedly dropped to near-zero. The accident occurred during a safety test on the steam turbine of an RBMK-type nuclear reactor. ![]() The initial emergency response, together with later decontamination of the environment, involved more than 500,000 personnel and cost an estimated 18 billion Soviet rubles-roughly US$68 billion in 2019, adjusted for inflation. It is one of only two nuclear energy accidents rated at seven-the maximum severity-on the International Nuclear Event Scale, the other being the 2011 Fukushima Daiichi nuclear disaster in Japan. It is considered the worst nuclear disaster in history both in cost and casualties. 4 reactor in the Chernobyl Nuclear Power Plant, near the city of Pripyat in the north of the Ukrainian SSR in the Soviet Union. The Chernobyl disaster was a nuclear accident that occurred on 26 April 1986 at the No. Varying estimates of increased mortality over subsequent decades (see Deaths due to the disaster) INES Level 7 (major accident) see Chernobyl disaster effectsįewer than 100 deaths directly attributed to the accident. ![]() ![]() (now Kyiv Oblast, Ukraine (Under Russian Occupation) Reactor 3 can be seen behind the ventilation stackĬhernobyl nuclear power plant, Pripyat, Chernobyl Raion, Kiev Oblast, Ukrainian SSR, Soviet Union Reactor 4 several months after the disaster.
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