Previously the Residual Heat Removal System was alternately being switched between cooling the reactor core and fuel pool.
2.
Crews had installed temporary submersible seawater pumps and hoses to supply cooling water to the residual heat removal system heat exchangers as the main seawater pumps were heavily damaged by the tsunami.
3.
Additionally, as there was heavy damage to electrical equipment in the basements from flooding, temporary power connections had to be made to the residual heat removal system main loop pumps.
4.
Examples of isolation groups include the main steamlines, the reactor water cleanup system, the reactor core isolation cooling ( RCIC ) system, shutdown cooling, and the residual heat removal system.
5.
The fuel pool and reactor core are now being cooled simultaneously, the fuel pool by the Fuel Pool Cooling System and Equipment Cooling Water System and the reactor core by the Residual Heat Removal System.
6.
The ultimate heat sink was restored when the service seawater system pumps in the pump room were repaired in units 1, 2 and 4 starting March 13 restoring the normal ECCS and heat removal systems to operable status and cooling was switched to the Residual Heat Removal System ( RHR ) portion of the ECCS . The RHR systems were first activated to cool down the suppression pools ( torus ) and drywells to operable status, and water injections were made to the reactors using the Low Pressure Coolant Injection ( LPCI ) mode as needed.
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