Document: NUREG-0800
Document ID: dd4f84a9-8976-44c4-b631-d7c0254f4efc
Document Type: srp
Title: PROBABILISTIC RISK ASSESSMENT AND SEVERE ACCIDENT EVALUATION FOR
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1416/ML14161A594.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.0
CFR Part: 
CFR Title: 

Content:
as follows: The containment should maintain its role as a reliable, leaktight barrier (e.g., by ensuring that containment stresses do not exceed American Society of Mechanical Engineers (ASME) Service Level C limits for metal containment or factored load category for concrete containments) for approximately 24 hours following the onset of core damage under the most likely severe accident challenges, and following this period, the containment should continue to provide a barrier against the uncontrolled release of fission products. 9. SECY-93-087, Section II.N, and the Commission’s SRM also provide guidance for a sequence-level seismic margins analysis (SMA). PRA insights will be used to support a margin-type assessment of seismic events. A PRA-based SMA will consider sequence- level HCLPFs and fragilities for all sequences leading to core damage or containment 19.0-11 Draft Revision 3 –November 2014 failure up to approximately 1.67 times the ground motion acceleration of the design- basis safe-shutdown earthquake (SSE). 10. SECY-96-128, “Policy and Key Technical Issues Pertaining to the Westinghouse AP600 Standardized Passive Reactor Design,” ADAMS Accession No. ML003708224, dated June 12, 1996, and the related SRM, ADAMS Accession No. ML003708192, dated January 15, 1997. 11. RG. 1.7, “Control of Combustible Gas Concentrations in Containment,” Revision 3, March 2007. 12. RG 1.216, “Containment Structural Integrity Evaluaion for Internal Pressure Loadings Above Design-Basis Pressure,” Revision 0, August 2010. 13. SECY-97-044, “Policy and Key Technical Issues Pertaining to the Westinghouse AP600 Standardized Passive Reactor Design,” ADAMS Accession No. ML003708316, dated February 18, 1997, and the related SRM, ADAMS Accession No. ML003708232, dated June 30, 1997. The above NRC policy statements provide guidance regarding the appropriate course of action to address severe accidents and the use of PRA. The SRMs relating to SECY-90-016, SECY-93-087,