Document: NUREG-0800
Document ID: 39eaebb5-884c-4731-895a-8df4686b7293
Document Type: srp
Title: REGULATORY TREATMENT OF NONSAFETY SYSTEMS FOR PASSIVE
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1403/ML14035A149.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.3
CFR Part: 
CFR Title: 

Content:
A using guidance in SRP 19.0 to assure that acceptance criteria in Section II of this SRP are satisfied. 2. The staff responsible for the review of the applicant’s PRA reviews the mission statements for RTNSS SSCs and verifies that R/A missions are consistent with the assumptions in the PRA or other pertinent assumptions related to the function of the SSC. The staff issues requests for additional information when necessary to gain a clear understanding of the stated mission or support a determination that the mission is reasonable given the function of the SSC. Area of Review – Augmented Design Standards 1. The staff reviews the applicant’s determination of safety functions that must be satisfied to maintain the plant in a safe stable shutdown condition in the post 72-hour period and the methods for achieving those safety functions. The staff verifies that nonsafety-related SSCs relied upon to achieve those functions have been designed to meet the augmented design standards for protection from seismic events and natural phenomena. 2. The staff reviews the applicant’s augmented design standards and verifies that they meet the acceptance criteria stated above in Section II. Area of Review – Regulatory Treatment of SSCs in the RTNSS Program 1. The staff responsible for the review of the applicant’s PRA reviews the results of the focused PRA sensitivity studies and confirms that the applicant has included requirements in the TSs, in accordance with 10 CFR 50.36(c)(2)(ii)(D), for nonsafety-related design features or functional capabilities with mitigation capability sufficient to reduce the CDF or LRF below the Commission goals when credited in the focused PRA. 2. The staff reviews ACs selected by the applicant for SSCs in the scope of the RTNSS program. The staff verifies that AC LCOs and completion times, if appropriate, are established such that the availability of each function provides reasonable assurance that RTNSS SSCs can meet their RTNSS R/A