Failure to remove decay heat may cause the reactor core temperature to rise to dangerous levels and has caused nuclear accidents, including the nuclear accidents at Three Mile Island and essential service water system which dissipates the heat into the'ultimate heat sink', often a sea, river or large lake.
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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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