Document: NRC Regulatory Guide
Document ID: cde52d5a-adf9-49be-9d1f-59449dfca895
Document Type: regulatory_guide
Title: TRIAL - Acceptability of Probabilistic Risk Assessment Results for Non-Light Water Reactor Risk-Informed Activities
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2123/ML21235A008.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.247
CFR Part: 
CFR Title: 

Content:
A-3. Staff Position on ASME/ANS RA-S-1.4-2021, Technical Requirements for Initiating Event Analysis Index No. Issue Position Resolution Section 4.3.2 Section text ------------------------ No objection ---------------------------------- Section 4.3.2.1 Section text ------------------------ No objection ---------------------------------- Table 4.3.2.1-1 HLR-IE-A through HLR-IE-D ------------------------ No objection ---------------------------------- Table 4.3.2.1-2 IE-A1 through IE-A18 ------------------------ No objection ---------------------------------- Table 4.3.2.1-3 IE-B1 through IE-B6 ------------------------ No objection ---------------------------------- Table 4.3.2.1-4 IE-C1 through IE-C8 ------------------------ No objection ---------------------------------- IE-C9 If operator actions are relied upon to detect and correct conditions that may lead to a complicated shutdown, the reliability of those actions should be shown to have an exceedingly low probability of failure (i.e., the collective failure probability for all operator actions in a given event sequence is less than or equal to 10-5) as assessed against human reliability analysis requirements for NLWR PRA endorsed by the NRC. Clarification (b) either: (1) the event has the same impact on the plant as another event that has a much higher frequency per the requirements of SCR-1 or SCR-2 in Table 1.10-1, or (2) the event does not require the plant to go to shutdown conditions until sufficient time has expired during which the initiating event conditions, with a high degree of certainty (based on supporting calculations such that the collective failure probability is less than or equal to 10-5 and in conformance with human reliability technical elements, are detected and corrected (either administratively or automatically) such that a RG 1.247, Appendix A, Page A-9 Table A-3. Staff Position on ASME/ANS RA-S-1.4-2021, Technical Requirements for Initiating Event Analysis Index No. Issue Position