Document: NUREG-0800
Document ID: 2d75d400-2d92-4d59-b4af-9c74991f62e0
Document Type: srp
Title: of the SAR.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0525/ML052500493.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.3
CFR Part: 
CFR Title: 

Content:
h. Criterion 22 — Protection System Independence "The protection system shall be designed to assure that the effects of natural phenomena, and of normal operating, maintenance, 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, ESFAS, and supporting data communication systems. Review Methods — Review of compliance with GDC 22 should address the following characteristics described in ANSI/IEEE Std 279 and IEEE Std 603. SRP Appendix 7.1-B and Appendix 7.1-C discuss methods for review of these characteristics. Location of Review Guidance Topic Appendix 7.1-B Item Appendix 7.1-C Item Design basis reliability requirements 1 4 Single-failure criterion 3 6 Quality 4 8 Equipment qualification 5 9 System integrity 6 10 Physical, electrical, and communications independence 7 and 8 11 and 24 Manual controls 18 23 Location of Review Guidance Topic Appendix 7.1-B Item Appendix 7.1-C Item Rev. 4 — June 1997 SRP 7.1-A-18 Setpoints 1 30 Power sources 6 31 i. Criterion 23 — Protection System Failure Modes "The protection system shall be designed to fail into a safe state or into a state demonstrated to be acceptable on some other defined basis if conditions such as disconnection of the system, loss of energy (e.g., electric power, instrument air), or postulated adverse environments (e.g., extreme heat or cold, fire pressure, steam, water, and radiation) are experienced." Applicability — The protection systems, RTS, ESFAS, and supporting data communication systems. Review Methods — Review of compliance with GDC 23 is accomplished as part of the review of system integrity requirements discussed in