Approach to the Quantification of Seismic Margins in Nuclear Power Plants.

摘要

The report is the second report of the Expert Panel on Quantification of Seismic Margins. The Panel's first report was entitled, 'NRC Seismic Design Margins Program Plan.' The objective of the report is to discuss progress to date in studying the issue of quantification of seismic margins in nuclear power plants. In particular, it deals with progress towards the establishment of review guidelines that would be useful in studying how much seismic margin exists. The guidelines themselves will be the subject of the next Panel report. The work presented in the report is the result of a detailed study of seismic Probabilistic Risk Assessments, historical earthquake performance of the nuclear and non-nuclear facilities, and test data, augmented by the individual experience and expertise of the Panel members. The major development discussed in the report is the HCLPF concept, which demonstrates margin by showing that there is a High Confidence of a Low Probability of Failure for a given earthquake size.