Document: NUREG-0800
Document ID: b8d2b8f5-432a-4c0a-81ab-20231f7d0f28
Document Type: srp
Title: PROBABILISTIC RISK ASSESSMENT AND SEVERE ACCIDENT EVALUATION FOR
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1508/ML15089A068.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.0
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Content:
revention and mitigation of severe accidents, e.g., challenges to containment integrity caused by core-concrete interaction, steam explosion, high-pressure core melt ejection, hydrogen combustion, and containment bypass. Note: The Statement of Consideration (72 FR 49380) for the 2007 revision of 10 CFR Part 52 states that postulated severe accidents are not design-basis accidents (DBA) and the severe accident design features do not have to meet the requirements for DBA (see SECY-93-087, “Policy, Technical, and Licensing Issues Pertaining to Evolutionary and Advanced Light-Water Reactor Designs,” dated April 2, 1993). However, the severe accident design features are part of a plant’s design-basis information. 7. 10 CFR 52.47(a)(27) states that a DC application must contain an FSAR that includes description of the design-specific PRA and its results. Note: • The Statement of Consideration (72 FR 49365) for the 2007 revision of 10 CFR Part 52 states that the definition of Tier 2 in Section II.E.1 of the DCRs has been modified to exclude the design-specific PRA and the evaluation of SAMDAs. The PRA and SAMDA evaluations do not need to be included in Tier 2 because they are not part of the design-basis information. • The Statement of Consideration (72 FR 49380) for the 2007 revision of 10 CFR Part 52 states the understanding that the complete PRA (e.g., codes) will be available for NRC inspection at the applicant’s offices, if needed. The NRC expects that, generally, the information that it needs to perform its review of the DC application from a PRA perspective is that information that will be contained in applicants’ FSAR Chapter 19. • Prior to the revision to 10 CFR Part 52 in August 2007, regulations required DC applicants to separately submit their PRAs. As a result, Chapter 19 of the design-specific DCDs submitted before the issuance of this rule revision did not include many PRA quantitative results. • Part of the PRA required by 10 CFR