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:
tiating events and, based on their importance to risk as determined from the PRA, has included them in the scope of RTNSS. 19.3-7 Revision 0 – June 2014 Area of Review – Functional Design of RTNSS SSCs 1. The staff will verify that the applicant has met the following acceptance criterion: The applicant has established functional requirements related to RTNSS R/A missions for the design of SSCs in the RTNSS program, including support systems. 2. The staff will verify that the applicant has met the following acceptance criterion: The applicant has designed SSCs in the RTNSS program, and their support systems, to satisfy their functional requirements related to the RTNSS R/A missions. 3. The staff will verify that the applicant has met the following acceptance criterion: The applicant has systematically evaluated adverse interactions between the passive safety systems and any nonsafety-related active systems providing defense-in-depth, and incorporated effective design improvements to minimize adverse systems interactions. The staff will also confirm that the applicant has properly updated the PRA model to account for any residual adverse system interactions, after design improvements have been made. 4. The staff will verify that the applicant has met the following acceptance criterion: The design of RTNSS SSCs includes features, as needed, to allow performance of those human actions necessary for successful implementation of the functional design requirement (e.g., controls, connections, access). Area of Review – Focused PRA Sensitivity Studies 1. The staff responsible for the review of the applicant’s PRA will verify that the applicant has met the following acceptance criterion: The applicant has used the focused PRA to determine (1) the functional R/A missions of active systems needed to meet NRC regulations, Commission goals and the containment performance goal objectives, and (2) the risk-significance associated with failure to accomplish each R/A mission.