Document: NUREG-0800
Document ID: ecf7a8d4-0097-4a93-8609-630545f03f70
Document Type: srp
Title: REGULATORY TREATMENT OF NONSAFETY SYSTEMS FOR PASSIVE
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1308/ML13081A756.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.3
CFR Part: 
CFR Title: 

Content:
ea 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. 19.3-12 Draft Rev.0 – June 2013 Area of Review – Regulatory Treatment of SSCs in the RTNSS Program 1. The staff 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 missions. The staff also verifies that surveillance requirements are established which provide an adequate level of support to ensure that component performance is consistent with its RTNSS R/A mission. Reviewers should assure that any support systems needed to establish the availability of a function have been identified and addressed with ACs. It is acceptable for support systems to simply inherit the controls of the supported system. The reviewer considers the activities, including tests, performed to implement a surveillance requirement and confirms that SSC availability can be