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:
irements for testability, operability with onsite and offsite electrical power, and single failures as appropriate based on their safety function consistent with the General Design Criteria applicable to safe shutdown systems. The staff concludes that these systems are testable and are operable on either onsite or offsite electrical power and that the controls associated with redundant safe shutdown systems are independent and satisfy the requirements of the single-failure criterion and, therefore, meet the relevant requirements of General Design Criteria 34, 35, and 38. In the review of the safe shutdown systems, the staff examined the power supply for the pressurizer level indication. Based on this review, the staff concludes that the safe shutdown systems satisfy the requirements of 10 CFR 50.34(f)(2)(xx). In the review of the safe shutdown systems, the staff examined the dependence of these systems on the available auxiliary supporting features and other auxiliary features. Based on this review and coordination with those having primary review responsibility of auxiliary supporting features and other auxiliary features systems, the staff concludes that the design of the safe shutdown systems is compatible with the functional requirements of auxiliary supporting features and other auxiliary features systems. In addition, to the extent that the review is not discussed in other SER sections, the findings will summarize the staff’s evaluation of the ITAAC, including design acceptance criteria, as applicable. 2. Note: the following finding applies only to systems involving digital computer-based components. Based on the review of software development plans and the inspections of the computer development process and design outputs, the staff concludes that the computer systems meet the guidance of RG 1.152. Therefore, the special characteristics of computer systems have been adequately addressed, and the staff finds that the computer-based safe shutdown systems