Document: NRC Regulatory Guide
Document ID: 6f84e3bf-9ff3-49fb-a16a-0de3b89e6bc6
Document Type: regulatory_guide
Title: An Approach for Plant-Specific Risk-Informed Decisionmaking for Inservice Inspection of Piping (Rev. 2)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2103/ML21036A105.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.178
CFR Part: 
CFR Title: 

Content:
use of PRA findings. Areas to be evaluated from this viewpoint include meeting the regulations, defense-in-depth attributes, safety margins, assessment of the failure potential of piping segments, and assessment of primary and secondary effects (failures) that result from piping failures. The engineering analysis for a RI-ISI piping program should achieve all of the following: a. Assess compliance with applicable regulations. b. Perform a defense-in-depth evaluation. c. Perform a safety margin evaluation. d. Define piping segments. e. Assess the failure potential for the piping segment. f. Assess the consequences (both direct and indirect) of piping segment failure. g. Categorize the piping segments in terms of safety significance. h. Develop an inspection program. i. Assess the impact of changing the ISI program on CDF and LERF. j. Demonstrate conformance with the key principles (e.g., maintaining sufficient safety margins, defense-in-depth consideration, Commission policy statement on safety goals). 2.1.1 Assess Compliance with Applicable Regulations The engineering evaluation should assess whether the proposed changes to the ISI programs would compromise compliance with the regulations. The evaluation should consider the appropriate requirements in the licensing basis and applicable regulatory guidance. Specifically, the evaluation should consider the following: RG 1.178, Page 12 a. 10 CFR 50.55a, b. Appendix A to 10 CFR Part 50, c. Appendix B, “Quality Assurance Criteria for Nuclear Power Plants and Fuel Reprocessing Plants,” to 10 CFR Part 50, d. ASME BPV Code, Section XI (10 CFR 50.55a), e. RG 1.84, “Design, Fabrication, and Materials Code Case Acceptability, ASME Section III” (Ref. 26), and f. RG 1.147. In addition, the evaluation should consider whether the proposed changes have affected license conditions. A broad review of the licensing requirements and commitments may be necessary because proposed ISI program changes could affect issues not