Document: NUREG-0800
Document ID: f60cdc8f-3c25-45c3-a1d3-b0f530961625
Document Type: srp
Title: DETERMINING THE TECHNICAL ADEQUACY OF PROBABILISTIC RISK
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1219/ML12193A107.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.1
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CFR Title: 

Content:
develop a Level 1 and a Level 2 PRA. The PRA must cover those initiating events and modes for which NRC-endorsed consensus standards on PRA exist 1 year prior to the scheduled date for initial loading of fuel. 10 CFR 50.71(h)(2) requires that each COL holder shall maintain and upgrade the PRA required by 10 CFR 50.71(h)(1). The upgraded PRA must cover initiating events and modes of operation contained in NRC-endorsed consensus standards on PRA in effect 1 year prior to each required upgrade. The PRA must be upgraded every 4 years until the permanent cessation of operations under 10 CFR 52.110(a). 10 CFR 50.71(h)(3) requires that each COL holder shall, no later than the date on which the licensee submits an application for a renewed license, upgrade the PRA required by 10 CFR 50.71(h)(1) to cover all modes and all initiating events. 1 In this SRP, a part of a PRA can be understood as being equivalent to that piece of the analysis for which an applicable PRA standard (i.e., ASME/ANS RA-Sa-2009) identifies a supporting level requirement. 19.1- 4 Rev. 3 – September 2012 SRP Acceptance Criteria In order for the NRC staff to conclude that a PRA is of sufficient technical adequacy to support an application, the staff needs to be assured that (1) the parts of the PRA needed to support the application have been appropriately identified and (2) those parts are technically defensible. The former needs to be addressed as part of the assessment of the application. The latter can be met by determining that the necessary parts of the PRA have been performed in accordance with the staff position on consensus PRA standards and industry programs as documented in the appendices to RG 1.200. Where there are differences in approach to performing a specific part, the staff can determine that the approach used by the applicant is either equivalent to, or better than, that supported by the staff position. III. REVIEW PROCEDURES These review procedures are based on the identified SRP