Development of a National Standard on External Event PRA

摘要

The American Nuclear Society is developing a national Standard for use of probabilistic risk assessment (PRA)rntechniques, applicable to external events for licensed commercial nuclear power plants. The Standard will be consistent withrnthat developed by ASME for Level 1, internal events. This paper presents a status report on the ongoing efforts in therndevelopment of the ANS Standard.rnThe scope of the effort is to define the requirements for conducting a quality PRA for external events. These includernamong others seismic, high winds, external flooding and man-made events such as aircraft imp act, nearby transportationrnaccidents, and those involving nearby industrial facilities. Note that the fire PRA is not within the scope of this Standard (arnseparate Standard is being developed by NFPA). PRAs developed using this Standard will be capable of providing arnreasonable estimate of baseline risk from earthquakes and other external events, as measured by criteria such as core damagernfrequency (CDF) and large early release frequency (LERF).