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Shutdown is the state of a nuclear reactor when the fission reaction is slowed significantly or halted completely. Different nuclear reactor designs have different definitions for what "shutdown" means, but it typically means that the reactor is not producing a measurable amount of electricity or heat and is in a stable condition with very low reactivity.
A clean-up crew working to remove radioactive contamination after the Three Mile Island accident. Nuclear safety is defined by the International Atomic Energy Agency (IAEA) as "The achievement of proper operating conditions, prevention of accidents or mitigation of accident consequences, resulting in protection of workers, the public and the environment from undue radiation hazards".
The issue was worsened by leaders referring to B-52 sorties as "nuclear strikes", [48] by the increased use of encrypted diplomatic channels between the US and UK, [49] and by the nuclear attack false alarm in September. In response, Soviet nuclear capable aircraft were fueled and armed ready to launch on the runway, and ICBMs were brought up ...
Reactors 1, 2, 5 and 6 are in cold shutdown, while Reactor No. 3 is shut down for repair and Reactor No. 4 is in so-called hot shutdown, according to the plant.
Passive nuclear safety is a design approach for safety features, implemented in a nuclear reactor, that does not require any active intervention on the part of the operator or electrical/electronic feedback in order to bring the reactor to a safe shutdown state, in the event of a particular type of emergency (usually overheating resulting from a loss of coolant or loss of coolant flow).
The last operating reactor at the Zaporizhzhia Nuclear Power Plant, reactor No. 6, has been safely shut down. Xinhua News Agency via Getty ImagesEnergoatom, operator of the Zaporizhzhia Nuclear ...
Safety at the Russian-held Zaporizhzhia nuclear power plant in Ukraine remains precarious but the shift to a cold shutdown of all six reactor units, completed on Saturday, is positive, the U.N ...
The cooling system was restored before the meltdown but the unit had to be shut down due to the elevated cost of the repair. 0: 220 [39] 3 March 1992: Sosnovy Bor, Leningrad Oblast, Russia: An accident at the Sosnovy Bor nuclear plant leaked radioactive iodine into the air through a ruptured fuel channel. February 20, 1996