DEVELOPMENT AND STATUS OF THE ASME/ANS RA-S-1.3-2017 LEVEL 3 PRA STANDARD

摘要

This paper discusses the development and status of theLevel 3 Probabilistic Risk Assessment (PRA) Standard(ASME/ANS RA-S-1.3-2017), whose full title is “Standardfor Radiological Accident Offsite Consequence Analysis(Level 3 PRA) to Support Nuclear InstallationApplications.” The standard development effort began in2005 with the formation of a standard writing groupinvolving professional practitioners from industry, thenational laboratories, and the Nuclear RegulatoryCommission (NRC). The writing group worked for over adecade to develop the technical requirements, interactwith other standards writing groups, resolve reviewcomments, and successfully pass the standards ballotingprocess. The Level 3 PRA Standard is currently publiclyavailable for trial use and application.This paper also summarizes the technical elementsincluded in the Level 3 PRA Standard, challengesencountered by the writing group and lessons learned inthe standard development process, includingincorporation of insights from two trial applications usinga draft of the standard. The completion and availability ofthe standard for trial use now provides a basis forassessing the technical adequacy of a conditionalconsequence analysis for atmospheric dispersion or a fullLevel 3 PRA to support risk decision making, such aspotentially justifying a smaller emergency planning zonearound a nuclear facility.