CHERNOBYL DISASTER By SRUTHI SRINIVAS
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AT A GLANCE location Chernobyl Time : Late night Date: 25th -26th April, 1986. Type catastrophic nuclear accident. 1 Nuclear plant near Pripyat in northern Ukraine.
CHERNOBYL DISASTER Referred as Chernobyl accident. It occurred on 25-26 April 1986 in the No. 4 light water graphite moderated reactor at the Chernobyl Nuclear Power Plant The event occurred during a late-night safety test which simulated a station blackout power-failure, in the course of which safety systems were intentionally turned off.
It is considered the most disastrous nuclear power plant accident in the history, both in terms of cost and causalities It is one of the only two nuclear energy disaster classified with level 7(The maximum classification) event on the International Nuclear Event Scale, the other being Fukushima nuclear disaster in japan.2011.
CHERNOBYL NUCLEAR PLANT It is a decommissioned nuclear power station. Situated near the city of Pripyat, Ukraine and northwest of the city of Chernobyl. After the disaster (1986), the power plant is declared in a restricted area known as the Chernobyl exclusive zone. Both the zone and the former power plant are administered by the state agency of the Ukraine of the exclusive zone. Site clean up is scheduled for completion in 2065.
NUCLEAR DECOMMISSIONING It is the process whereby a nuclear facility is dismantled to the point that no longer requires measures for radiation protection. -Xt is an administrative and technical process. It includes clean up of radioactive materials and progressive demolition of the facility
ACCIDENT Reactor 4 suffered a sudden power increase leading to steam explosion in its core. As the reactor had not been encased by any kind of hard containment vessel, it dispersed large quantities of radioactive isotopes in the atmosphere Caused an open graphite fire that increased the emission of radioactive particles carried by the smoke. The accident occurred during an experiment scheduled to test the viability of a potential safety emergency core cooling feature.
The fire produced for about 9 days Emitted five lofted plumes of fission products into the atmosphere The estimated radioactive inventory that was released during hot five phase equalled in magnitude of airborne fission product released in the initial destructive explosion The radio active material precipitated onto parts of the western USSR and Europe
CAUSES IAEA (International Atomic Energy Agency) created a group known as the International Nuclear Safety Advisory Group (INSAG). There were two official explanations of the accident. INSAG(International Nuclear Safety Advisory Group) submitted a report in 1986 named INSAG-1 report(1986) and INSAG-7 report (1992).
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