Document: NUREG-0800
Document ID: 949ca18d-b0e4-4b54-9ca9-fdb657988111
Document Type: srp
Title: Revision 5 - March 2007
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070660170.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
ppendix 7.1-C should also be applied to I&C systems required for operation of ESF systems or their auxiliary supporting features and other auxiliary features. Appendix 7.1-A-15 Revision 5 - March 2007 (f) GDC 15, "Reactor Coolant System Design" "The reactor coolant system and associated auxiliary, control, and protection system shall be designed with sufficient margin to ensure that the design conditions of the reactor coolant pressure boundary are not exceeded during any condition of normal operation, including anticipated operational occurrences." Applicability - I&C protection and control systems. Review Methods - Evaluation of I&C system contributions to design margin for reactor coolant systems should be a part of the review of the adequacy of I&C protective and control functions. This review is coordinated with the organization responsible for the review of reactor systems. The I&C systems may contribute to reactor coolant system design margin in many ways, for example, by providing better than the minimum required performance, as conservatism in setpoint calculations, or by system features that make the protection or control systems more fault tolerant. Margin may also be credited in many places and there will naturally be tradeoffs between margin in the reactor design, margin in performance analysis assumptions and methods, and margin in the I&C design. The reactor systems and I&C reviewers should work together to understand the margins provided in the applicant's design and to confirm there is reasonable assurance that adequate margin is provided. (g) GDC 16, "Containment Design" "Reactor containment and associated systems shall be provided to establish an essentially leak-tight barrier against the uncontrolled release of radioactivity to the environment and to assure that the containment design conditions important to safety are not exceed for as long as postulated accident conditions require." Applicability - ESF I&C systems. Review Methods - GDC 16