What are the different levels of earthquakes from the point of view of designing and construction of a nuclear power plant?
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What are the different levels of earthquakes from the point of view of designing and construction of a nuclear power plant?
Based on the probability of occurrence, the earthquakes are classified into two levels· They are
a) S-1 Level
b) S-2 Level
S-1 Level Earthquake
The maximum ground motion which is reasonably expected to occur once during the life of nuclear power plant with an estimated period of return of 100 years. In design S-1 level earthquake corresponds to OBE will resist S-1 level earthquake within the elastic limit.
S-2 Level Earthquake
The maximum ground. the ground motion which has a very low probability of occurrence with an estimated period of return of 10,000 years. In design, an S-2 level earthquake corresponds to SSE S-2 level earthquake can damage the components beyond their elastic limit. E.g. a Fuel pin in the nuclear reactor core can deform during an S-2 level earthquake but should not puncture.