Document: NUREG-0800
Document ID: 7916b088-fb90-4163-84fe-027bd315bcc5
Document Type: srp
Title: REVIEW OF RISK INFORMATION USED TO SUPPORT PERMANENT PLANT-
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0717/ML071700658.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.2
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Content:
upports the defense-in-depth philosophy, and preserves safety margins. Thus, risk analysis will inform, but it will not determine regulatory decisions. The NRC's PRA Implementation Plan as proposed in Reference 3, now replaced by the Risk- Informed Regulation Implementation Plan (SECY-00-0213), identifies a wide scope of regulatory activities for which PRA provides valuable insights. This scope includes activities that require NRC review and approval, as well as other activities that are considered internal to the NRC and affect licensees and applicants in a less direct manner (e.g., generic issue prioritization). This SRP section solely concerns licensing amendment requests submitted for NRC review and approval for which PRA can play an effective role in the decisionmaking process. General review guidance for applicable activities is presented in this SRP section. In addition, application-specific SRP sections are available to provide additional guidance for several activities including the following examples: • Changes to allowed outage times (AOTs) and surveillance test intervals (STIs) in plant-specific technical specifications (SRP section 16.1) • Changes in the scope and frequency of tests on pumps and valves in a licensee's inservice test (IST) program (SRP section 3.9.7) 19.2-3 June 2007 • Changes in the scope and frequency of inspections in a licensee's inservice inspection (ISI) program (SRP section 3.9.8) Regulatory Guide 1.174 defines an acceptable approach for use in analyzing and evaluating proposed LB changes. This approach supports the staff's desire to base its decisions on the results of traditional engineering evaluations, supported by insights (derived through the use of PRA methods) on the risk significance of the proposed changes. The decisionmaking process leading to the proposed change is expected to follow an integrated approach (considering traditional engineering and risk information) and may build upon qualitative factors as well as