Document: NUREG-0800
Document ID: be0ff036-ddfa-4ffb-8bb7-15e0fd9a1142
Document Type: srp
Title: 7.2 7.3 7.4 7.5 7.6 7.7
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350467.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.1
CFR Part: 
CFR Title: 

Content:
fety features actuation system (ESFAS). Review Method: Chapter 15 of the SAR provides the bases for protective system functions for anticipated operational occurrences and accidents. The evaluation of conformance to GDC 20 is addressed in the review of Sections 7.2 and 7.3 of the SAR. g. Criterion 21 - Protection System Reliability and Testability. "The protection system shall be designed for high functional reliability and inservice testability commensurate with the safety functions to be performed. Redundancy and independence designed into the protection system shall be sufficient to assure that (1) no single failure results in loss of the pro- tection function and (2) removal from service of any component or channel does not result in loss of the required minimum redundancy unless the acceptable reliability of operation of the protection system can be otherwise demonstrated. The protection system shall be designed to permit periodic testing of its functioning when the reactor is in operation, including a capability to test channels independently to determine failures and losses of redundancy that may have occurred." Applicability: The protection systems: RTS and ESFAS. Review Methods: See RGs 1.22, 1.47, 1.53, 1.118 and IEEE Stds 338 and 379 below. The evaluation of conformance to GDC 21 is addressed in the review of Sections 7.2 and 7.3 of the SAR. h. Criterion 22 - Protection System Independence. "The protection system shall be designed to assure that the effects of natural phenomena, and of normal operating, main- tenance, testing, and postulated accident conditions on redundant channels do not result in loss of the protection function, or shall be demonstrated to be acceptable on some other defined basis. Design techniques, such as functional diversity or diversity in component design and principles of operation, shall be used to the extent practical to prevent loss of the protection function." Applicability: The protection systems: RTS and ESFAS. Review