What is the definition of safe shutdown earthquake (SSE)?
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What is the definition of safe shutdown earthquake (SSE)?
A safe shutdown earthquake is a level of ground motion where the features of the nuclear power plant are required for the safe shutdown of the reactor. The features are
a) Those which assure the integrity of coolant pressure boundary.
b) Those required for the safe removal of decay heat from the reactor.
c) Capability to shut down the reactor.
d) Confining the radioactive exposure to mitigate the offsite exposure.
The PGA of this level of earthquake should not be less than 0.1g. The probability of occurrence of this earthquake once in 10,000 years. In general safety-related components should withstand SSE.