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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.
Norman Hilberry (left) and Leó Szilárd at Stagg Field, site of the first self-sustaining nuclear chain-reaction. There is no definitive origin for the term. United States Nuclear Regulatory Commission historian Tom Wellock notes that scram is English-language slang for leaving quickly and urgently, and he cites this as the original and most likely accurate basis for the use of scram in the ...
Emergency core cooling systems (ECCS) are designed to safely shut down a nuclear reactor during accident conditions. The ECCS allows the plant to respond to a variety of accident conditions (e.g. LOCAs) and additionally introduce redundancy so that the plant can be shut down even with one or more subsystem failures. In most plants, ECCS is ...
Reactor unit 4 is in "hot shutdown", mainly for heating purposes. IAEA Director General Rafael Grossi says that fighting a war around a nuclear plant has put nuclear safety and security in ...
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 ...
United States Department of Defense directive 5230.16, Nuclear Accident and Incident Public Affairs (PA) Guidance, [1] Chairman Joint Chiefs of Staff Manual 3150.03B Joint Reporting Structure Event and Incident Reporting, and the United States Air Force Operation Reporting System, as set out in Air Force Instruction 10-206 [2] detail a number of terms for reporting nuclear incidents internally ...
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 ...
The Fukushima Daiichi nuclear disaster in 2011 occurred due to a loss-of-coolant accident. The circuits that provided electrical power to the coolant pumps failed causing a loss-of-core-cooling that was critical for the removal of residual decay heat which is produced even after active reactors are shut down and nuclear fission has ceased.