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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...

   Electrical cooling pumps fail, electrically operated valves are disabled and instruments in the control room fail. Reactor 1 Isolation Condensor (IC) valves fail – close with loss of power, disabling the IC cooling system. Reactor decay heat is at approximately 1.5% prior output (22 MW Unit 1, 33 MW Units 2 & 3).

4. Fukushima nuclear accident (Unit 2 Reactor) - Wikipedia

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

   The reactor core isolation cooling (RCIC) system was manually activated by operators at 15:39 following power loss, but by midnight the status of the reactor was unclear; some monitoring equipment was still operating on temporary power. [6] The coolant level was stable and preparations were underway to reduce pressure in the reactor containment ...

5. 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.

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7. 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 ...

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   People looking to save money for a big trip or financial investment may want to make plans around an "extra" paycheck in their pocket.. Employees who get paid on a biweekly basis (every other week ...

9. Boiling water reactor safety systems - Wikipedia

   en.wikipedia.org/wiki/Boiling_water_reactor...

   However, the tsunami disabled four of the six sets of switchgear and all but three of the diesel backup generators which operated the emergency cooling systems and pumps. Pumps were designed to circulate hot fluid from the reactor to be cooled in the wetwell, but only units 5 and 6 had any power. Units 1, 2 and 3 reactor cores overheated and ...