Document: NUREG-0800
Document ID: 8dd882f4-a34f-4415-acd1-ebb441c72786
Document Type: srp
Title: PROBABILISTIC RISK ASSESSMENT AND SEVERE ACCIDENT
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1213/ML12132A481.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.0
CFR Part: 
CFR Title: 

Content:
ion or truncation, or new treatment of CCF. 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. 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 (See Interim Staff Guidance DC/COL-ISG-024 pertaining to RG 1.221 for treatment of hurricane missiles). 23. The staff will determine that the applicant has performed an evaluation of containment structural integrity for internal pressure loadings above design-basis pressure in accordance with guidelines in RG 1.216 or an acceptable alternative. Acceptance Criteria for a PRA-based SMA 24. The staff will determine that the applicant has performed a PRA-based SMA to determine the seismic capacity of the plant and for each sequence that may lead to core damage or large release. 25. The design-specific plant system and accident sequence analysis for a PRA-based SMA is performed in accordance with, at a minimum, the Capability Category I requirements of Section 5-2.3 of Part 5 of the ASME/ANS PRA standard (Reference 1), with the exceptions that the analysis should not be based on site-specific and plant-specific information and should not rely on an as-built and as-operated plant. 26. Screening of rugged SSCs may be performed in a PRA-based SMA based on the DC’s Certified