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:
ve action evaluation should be provided to the licensee’s PRA and RI-ISI groups so that any necessary model changes and regrouping are done, as appropriate. e. The RI-ISI program documents should be revised to document any RI-ISI program changes resulting from the corrective actions taken. f. A program should be in place that monitors industry findings. g. Piping is subject to examination. The examination requirements include all piping evaluated by the risk-informed process and categorized as safety significant. h. The inspection program is to be completed during each 10-year inspection interval with the following exceptions. (1) If, during the interval, a reevaluation using the RI-ISI process is conducted and scheduled items are no longer required to be examined, these items may be eliminated. (2) If, during the interval, a reevaluation using the RI-ISI process is conducted and items must be added to the examination program, those items should be added. i. If additional examinations are needed following the identification of unacceptable flaws, additional examinations should be performed on the elements with the same root cause or degradation mechanisms as the identified flaw or relevant condition. The number of additional examinations should be equivalent to the number of elements required to be inspected during the current outage. If unacceptable flaws or relevant conditions are again found similar to the initial problem, the remaining elements identified as susceptible should be examined. All additional examinations should be performed during the current outage. j. Pressure testing and VT-2 visual examinations are to be performed on Class 1, 2, and 3 piping systems in accordance with ASME BPV Code, Section XI, as specified in the licensee’s ISI program. The pressure testing and VT-2 examinations are also to be performed on non-Code safety-significant piping. The non-Code safety-significant piping will be treated as ASME Code Class piping for the purposes of