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The shutdown margin for nuclear reactors (that is, when the reactor is considered to be safely in a shutdown state) is usually defined either in terms of reactivity or dollars. For reactivity, this is calculated in units of delta-k/k, where k is equal to the criticality of the reactor (essentially, how fast and controlled the nuclear fission ...
Of the 253 nuclear power reactors originally ordered in the United States from 1953 to 2008, 48 percent were cancelled, 11 percent were prematurely shut down, 14 percent experienced at least a one-year-or-more outage, and 27 percent are operating without having a year-plus outage.
A reactor protection system (RPS) is a set of nuclear safety and security components in a nuclear power plant designed to safely shut down the reactor and prevent the release of radioactive materials. The system can "trip" automatically (initiating a scram), or it can be tripped by the operators. Trips occur when the parameters meet or exceed ...
The groups say PG&E has delayed testing on equipment that could “cause a catastrophic meltdown” of Diablo Canyon nuclear power plant. Anti-nuclear groups demand ‘immediate shutdown’ of ...
Eight German nuclear power reactors (sBiblis A and B, Brunsbüttel, Isar 1, Krümmel, Neckarwestheim 1, Philippsburg 1 and Unterweser) were permanently shut down on 6 August 2011, following the Japanese Fukushima nuclear disaster. [1] A nuclear power phase-out is the discontinuation of usage of nuclear power for energy production
Here is a look at Germany's politically charged debate on nuclear power. The move marks another hiccup in the country's long-running plan to end the use of atomic energy.
Europe's largest nuclear plant was captured by Russian forces in March 2022. Ukraine and Russia accuse each other of shelling around the station and the International Atomic Energy Agency (IAEA ...
This was noticed when it caused a power surge at the startup of Ignalina Nuclear Power Plant Unit number 1, in 1983. On April 26, 1986, the Chernobyl disaster happened due to a fatally flawed shutdown system, after the AZ-5 shutdown system was initiated after a core overheat. RBMK reactors were subsequently either retrofitted to account for the ...