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:
-------------------- No objection -------------------- 2-2.1 – IE 2-2.1.1 -------------------- No objection -------------------- Table 2-2.1-1 -------------------- No objection -------------------- Tables 2-2.1-2(a) thru 2-2.1-5(d) IE-A1 thru IE-A4, IE-A7 thru IE-A10 -------------------- No objection -------------------- IE-A5 The search for initiators should go down to the subsystem/train level. Capability Category III should consider the use of “other systematic processes.” Clarification Cat I and II: PERFORM a systematic evaluation of each system and where necessary down to the subsystem or train level, including support systems…. Cat III: PERFORM a systematic evaluation of each system down to the subsystem or train level, including support systems…. PERFORM an FMEA (failure modes and effects analysis) or other systematic process to assess…. DG-1362, Appendix A, Page A-9 Table A-2. Staff Position on ASME/ANS RA-Sa-2009 Part 2, Technical and Peer Review Requirements for At-Power Internal Events Index No Issue Position Resolution IE-A6 Initiating events from common cause or from both routine and non- routine system alignments should be considered. Clarification Cat II: …resulting from multiple failures, if the equipment failures result from a common cause, and or from routine system alignments resulting from preventive and corrective maintenance. Cat III: …resulting from multiple failures, including equipment failures resulting from random and common causes, and or from routine system alignments resulting from preventive and corrective maintenance. IE-B1 thru IE-B5 -------------------- No objection -------------------- IE-C1 thru IE-C11, IE-C13 thru IE-C15 -------------------- No objection -------------------- IE-C12 Providing a list of generic data sources would be consistent with other SRs related to data. Clarification COMPARE results and EXPLAIN differences in the initiating event analysis with generic data sources to provide a reasonable check