Residual heat removal system

After shutdown of a nuclear reactor, the core continues to produce decay heat due to the nuclear decay of fission products created during reactor operation. In a boiling-water or pressurized-water reactor (BWR or PWR), the residual heat removal system (RHR system) is used to remove this decay heat, and also serves safety functions during an accident. The RHR system may also be called the decay heat removal system or the shutdown cooling system.

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