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
CFR Part: 
CFR Title: 

Content:
ired upgrade. 20. RG 1.200 describes the elements of a PRA maintenance and update program that is acceptable to the staff. If the staff can confirm that the applicant’s proposed program includes the key elements described in RG 1.200, it may conclude that such a program is acceptable. 21. The PRA Standard in Part 7, “Requirements for High Wind Events At-Power PRA,” does not specify Supporting Requirements for Capability Category 1 for developing the wind hazard. In the analysis of high winds, tornado frequencies developed with methods and data in NUREG/CR-4461, Revision 1, and based on data for the central region of the United States will normally be acceptable because the central region of the country has the highest occurrence rate of tornadoes and the highest tornado intensities. 22. In the analysis of high winds, tornados may not always be bounding with respect to the damaging effects of missiles. In coastal regions prone to severe hurricanes, a missile generated by hurricane force winds may be more damaging than one created by a tornado. Interim Staff Guidance DC/COL-ISG-024 pertaining to RG 1.221 provides an acceptable approach for treatment of hurricane missiles in the PRA. 19.0-16 Revision 3 – December 2015 23. Section 5 of RG 1.7 provides criteria acceptable to the NRC staff for demonstrating the requirements in 10 CFR 50.44(c)(5) regarding containment structural integrity have been met. 24. The RG 1.216 describes methods that the NRC staff considers acceptable for (1) predicting the internal pressure capacity for containment structures above the design- basis accident pressure, (2) demonstrating containment structural integrity related to combustible gas control, and (3) demonstrating containment structural integrity through an analysis that specifically addresses the Commission’s performance goals related to the prevention and mitigation of severe accidents. Acceptance Criteria for a PRA-based SMA This section provides guidance for the NRC