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:
he completion of this section. IV. EVALUATION FINDINGS The reviewer verifies that the applicant has provided sufficient information to address the regulatory criteria stated in the section on RTNSS in the staff’s Safety Evaluation Report (SER) and that the review and calculations (if applicable) support conclusions of the following type to be included in the SER. The reviewer also states the bases for those conclusions. 1. The staff concludes that the applicant’s process for using the focused PRA results to identify RTNSS-important nonsafety-related SSCs follows the process approved by the NRC and is therefore acceptable. 2. Based on its review, the staff concludes that the applicant has correctly identified the nonsafety equipment relied upon to meet beyond design basis deterministic NRC performance requirements such as the SBO and ATWS rules, and therefore require regulatory treatment. 3. The staff finds that the applicant has included sufficient nonsafety-related equipment in the RTNSS program to ensure that safety functions relied upon in the post-72-hour period and following seismic events have a reasonable likelihood of being successful. Further, the staff finds that the nonsafety-related equipment relied upon in the post-72-hour period has been designed in accordance with Commission policy and that the applicant has established appropriate ACs for this equipment. 4. The staff has reviewed the mission statements for SSCs including R/A missions. These statements correctly describe the missions of RTNSS and nonsafety-related SSCs and R/A missions are consistent with assumptions in the PRA; therefore, the staff finds them acceptable. 19.3-13 Revision 0 – June 2014 5. The applicant proposed a means for implementing RTNSS controls in the form of administrative ACs for the SSCs as discussed in the SER Section. The ACM, which has been incorporated into the FSAR, documents the ACs. 6. The staff has reviewed the applicant’s implementation of the RTNSS process