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2. Loss-of-coolant accident - Wikipedia

   en.wikipedia.org/wiki/Loss-of-coolant_accident

   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.

3. Timeline of the Fukushima nuclear accident - Wikipedia

   en.wikipedia.org/wiki/Timeline_of_the_Fukushima...

   Coolant injection into reactors 1 and 3 is interrupted for 50 minutes due to a loss of power after a strong earthquake in the region. [170] Workers plan to pump water into turbine condensers, but need to pump water out of them first. Work to transfer water from the unit 2 and unit 1 condensers to a central storage tank was completed on 9 and 10 ...

4. Nuclear reactor safety system - Wikipedia

   en.wikipedia.org/wiki/Nuclear_reactor_safety_system

   The High Pressure Coolant Injection (HPCI) System consists of a pump or pumps that have sufficient pressure to inject coolant into the reactor vessel while it is pressurized. It is designed to monitor the level of coolant in the reactor vessel and automatically inject coolant when the level drops below a threshold.

5. Fukushima nuclear accident (Unit 1 Reactor) - Wikipedia

   en.wikipedia.org/wiki/Fukushima_nuclear_accident...

   Fresh water was used from 14 May. By 29 May water was able to be injected using a temporary pump and the Spent Fuel Pool Cooling (FPC) line. [74] [90] On 10 August, the spent fuel pool was switched from the water-injection system – that functioned some 5 months – to a circulatory cooling system. For the first time since the 11 March ...

6. Three Mile Island accident - Wikipedia

   en.wikipedia.org/wiki/Three_Mile_Island_accident

   [48] [49] At 4:15 a.m., the relief diaphragm of the pressurizer relief tank ruptured, and radioactive coolant began to leak into the general containment building. This radioactive coolant was pumped from the containment building sump to an auxiliary building, outside the main containment, until the sump pumps were stopped at 4:39 a.m. [49]

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8. Shutdown (nuclear reactor) - Wikipedia

   en.wikipedia.org/wiki/Shutdown_(nuclear_reactor)

   In a cold shutdown, the coolant system is typically lowered to pump water at atmospheric pressure, and the reactor vessel remains below 93 °C (200 °F). This temperature is so low that the cooling water in a light-water reactor does not boil or vaporise even if the pressure in the cooling circuit drops completely. [6]

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