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:
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 PRA and Severe Accident staff 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. Area of Review – Augmented Design Standards 1. The staff will verify that the applicant has met the following acceptance criterion: Safety functions required in the post 72-hour period following an accident can be accomplished with onsite equipment and supplies. 2. The staff will verify that the applicant has met the following acceptance criterion: RTNSS “B” SSCs and supporting equipment will be readily available for connection. Use of on- site equipment and supplies, including mobile