Document: NRC Regulatory Guide
Document ID: 22ccfd5e-c5d8-4615-a02c-32369aa9f533
Document Type: regulatory_guide
Title: Acceptability of Probabilistic Risk Assessment Results for Risk-Informed Activities (Rev. 3)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1930/ML19308B636.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.200
CFR Part: 
CFR Title: 

Content:
MENT the process used in the seismic plant-response analysis and quantification, including. For example, this documentation typically includes a description of SPR-F3 -------------------- No objection -------------------- Notes -------------------- No objection -------------------- Section 5-3 Section 5-3 -------------------- No objection -------------------- Section 5-4 Section 5-4 -------------------- No objection -------------------- Nonmandatory Appendix 5-A Nonmandatory Appendix 5-A -------------------- No objection -------------------- DG-1362, Appendix C, Page C-1 APPENDIX C GUIDANCE FOR CLASSIFYING CHANGES TO A PRA AS PRA MAINTENANCE OR A PRA UPGRADE A change to a base probabilistic risk assessment (PRA) may involve PRA maintenance or a PRA upgrade including the use of an NDM. The distinction between these activities are important because a PRA upgrade, including the use of an NDM, should be peer reviewed, whereas changes due to PRA maintenance do not need to be peer reviewed. The level of detail of the peer review and the peer review team member qualifications differ between the peer review for a PRA upgrade and the peer review for the use of an NDM. PRA Maintenance and PRA Upgrades PRA maintenance activities do not need a peer review because the base PRA will have been previously peer reviewed and the licensee has not made fundamental changes to the base PRA. Consequently, the licensee will have demonstrated experience in applying the methods in the base PRA model. This is not true for PRA upgrades or use of an NDM which have not been previously peer reviewed. Therefore, the licensee has not demonstrated experience in applying the changes to the base PRA. In applying the guidance described in the staff position on peer reviews for PRA upgrades or NDMs (regulatory position C.2.2 of Section C of this RG), it should be determined whether the change to the PRA is PRA maintenance or a PRA upgrade, which includes the use of an NDM. Since PRA maintenance is