Document: NUREG-0800
Document ID: 59c7531b-4cb1-436b-af66-a05bf36ba24f
Document Type: srp
Title: SAFE SHUTDOWN SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1515/ML15159B122.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.4
CFR Part: 
CFR Title: 

Content:
4.3 should be followed for the review of ITAAC. The review of ITAAC cannot be completed until after the completion of this section. IV. EVALUATION FINDINGS The reviewer verifies that the applicant has provided sufficient information and that the review and calculations (if applicable) support conclusions of the following type to be included in the staff’s safety evaluation report (SER). The reviewer also states the bases for those conclusions. 1. The NRC staff concludes that the design of the safe shutdown systems and the safe shutdown initiation of the auxiliary supporting features and other auxiliary features systems are acceptable and meet the relevant requirements of General Design Criteria 1, 2, 4, 13, 19, 34, 35, and 38 and 10 CFR 50.54(jj) and 10 CFR 50.55(i). The staff conducted a review of these systems for conformance to the guidelines in the RGs and standards applicable to these systems. The staff concludes that the applicant or licensee adequately identified the guidelines applicable to these systems. Based on the review of the system design for conformance to the guidelines, the staff finds that there is reasonable assurance that the systems fully conform to the guidelines applicable to these systems. Therefore, the staff finds that the requirements of GDC 1 and 10 CFR 50.54(jj) and 10 CFR 50.55(i) have been met. The nonsafety portions of safe shutdown systems important to safety are appropriately isolated from safety systems, including the safety portions of the safe shutdown systems. Therefore, the staff concludes that the isolation of these systems from safety systems satisfies the requirements of 10 CFR 50.55a(h) and the requirements of GDC 24. The review included the identification of those systems and components for the safe shutdown systems that are designed to survive the effects of earthquakes, other natural phenomena, abnormal environments, and missiles. Based on the review, the staff concludes that the applicant/licensee has identified