Document: NUREG-0800
Document ID: fafcb45b-b0e5-49ad-9a69-0de2e8975189
Document Type: srp
Title: describes the general procedures to be followed in reviewing any I&C system. Section 7.5
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0525/ML052500506.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.1
CFR Part: 
CFR Title: 

Content:
em 13. – Interlocks for isolation of low-pressure systems from the reactor coolant system — See BTP HICB-1. – ECCS accumulator isolation valves — See BTP HICB-2. – Controls for changeover of RHR from injection to recirculation mode — See BTP HICB-6. • Conformance with Reg. Guide 1.47, "Bypassed and Inoperable Status Indication for Nuclear Power Plant Safety Systems." Rev. 4 — June 1997 SRP 7.5-7 • Independence — See Appendix 7.1-B item 8 and Appendix 7.1-C item 24. The indication system should be designed and installed in a manner which precludes the possibility of adverse effects on plant safety systems. Failure or bypass of a protective function should not be a credible consequence of failures occurring in the indication equipment, and the bypass indication should not reduce the required independence between redundant safety systems. • Use of digital systems — See Appendix 7.0-A. 3. Recommended review emphasis for annunciator systems • Reliability — The applicant/licensee should justify that the degree of redundancy, diversity, testability, and quality provided in annunciator systems is adequate to support normal and emergency operations. Appendix 7.1-C item 20 provides guidance on the evaluation of safety system reliability that may be used in evaluating the reliability of annunciator systems. • Use of digital systems — See Appendix 7.0-A. • Independence (isolation between safety systems and other systems) — See Appendix 7.1-B item 8 and Appendix 7.1-C item 24. Additional items for emphasis for ALWR annunciator systems • Redundancy — Redundant alarm systems should be provided. These redundant systems need not comply with the single failure criterion, but independence between the redundant systems should be equivalent to that provided between redundant channels of the protection systems. See Appendix 7.1-B item 7 and Appendix 7.1-C item 11. • Self-test provisions — See BTP HICB-17. The surveillance test portions of this