What is the definition of operation basis earthquake?
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Operating basis earthquake is a level of ground motion where the features of the nuclear power plant are required for continuing the operation. The component should function during OBE without undergoing any deformation. The level of ground motion of OBE is evaluated based on local geology, seismology and subsurface characteristics. The nuclear power plant is under operation during OBE. If this level of earthquake is exceeded, the plant should be shut down and inspected for any damages had occurred. The plant should restart only after obtaining the “fit for operation” certificate. The peak ground acceleration of this type of earthquake should not be less than 0.05 g in the horizontal direction. The estimated return period is 100 years.