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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.
An LPCI is an emergency system which consists of a pump that injects a coolant into the reactor vessel once it has been depressurized. In some nuclear power plants an LPCI is a mode of operation of a residual heat removal system, also known as an RHR or RHS but is generally called LPCI. It is also not a stand-alone valve or system.
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 ...
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 ]
On 24 March, electrical power (initially from temporary sources, but off-site power used from 3 April) was restored to parts of the unit which included the Main Control Room. [ 35 ] [ 42 ] The IAEA reported temperatures on 27 March at the bottom of Unit 2's Reactor Pressure Vessel (RPV) fell from 100 °C (212 °F) to 97 °C (206.6 °F).
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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 ...
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