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 -------------------- Table 4-2.2-1 HLR-ES-A Grammatical change for clarity Clarification ...identify equipment whose failure, including spurious operation, caused by an initiating fire, including spurious operation will would contribute … Tables 4-2.2-2(a) thru 4-2.2.5(d) Table 4-2.2-2(a) HLR-ES-A Conforming change to HLR-ES-A Clarification …identify equipment whose failure, including spurious operation, caused by an initiating fire, including spurious operation will would contribute … ES-A2 thru ES-A6 -------------------- No objection -------------------- DG-1362, Appendix A, Page A-24 Table A-4. Staff Position on ASME/ANS RA-Sa-2009 Part 4, Technical and Peer Review Requirements for At-Power Internal Fire Index No Issue Position Resolution ES-A1 Conforming change to HLR-ES-A Clarification IDENTIFY equipment whose failure, including spurious operation, caused by an initiating fire, including spurious operation would contribute … ES-B2, ES-B3, ES-B5 -------------------- No objection -------------------- ES-B1 The notes states this requirement is a starting point for selection of mitigating equipment, and that an iterative process will provide the completeness with respect to Table 1-1.3-1, which specifies that the significant contributors be included in the model. The requirement should represent the end result, not the beginning point. Although the definition of failure mode in Part 1 includes spurious operation, it is worth explicitly including since it is an important issue. Qualification Cat II: IDENTIFY Fire … and INCLUDE fire risk-significant equipment from the internal events PRA. NOTE-ES-B1-7: The gradation across … the Fire PRA (other equipment can be assumed failed in the worst possible failure mode, including spurious operation). This will tend … ES-B4 SR refers to incorrect SR Clarification … equipment identification per SRs ES- B1 through ES-B3B4. DG-1362, Appendix A, Page A-25 Table A-4. Staff Position on