Document: NUREG-0800
Document ID: 11a2be5f-50e6-47c7-beee-25b5049ab4bb
Document Type: srp
Title: REACTOR TRIP SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350474.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.2
CFR Part: 
CFR Title: 

Content:
ude requirements for the RTS. Review guidance for conformance to the GDC are provided in Appendix A of SRP Section 7.1 (Ref. 4). The review iuldance Includes references to the guidelines in regulatory guides and ndustry codes and standards where applicable. An audit review of the RTS should be made to confirm that the system conforms to the guidelines to support. the-conclusions of conformance to the regulations. The review is to evaluate the protection system design against the requirements of IEEE Std. 279. This procedure is detailed in Appendix B to SRP Section 7.1 (Ref. 5). The procedures in Appendix B address only those design requirements that are specific in nature. For example paragraph 4.9 of IEEE Std 279 requires that the design include means for checking the availability of each system input sensor during operation. Appendix B outlines a straightforward procedure that can be used to determine whether or not this requirement is met. Appendix B discusses the requirements of IEEE Std 279 and how they are used in the review of the RTS. Although the primary emphasis is on the equipment comprising the RTS, the reviewer should consider the protective functions on a systems level. It is necessary that the RTS design be compatible with the accident analysis. It is not sufficient to Judge the adequacy of the RTS only on the basis of the design meeting the specific requirements of IEEE Std 279. Major design considerations in the review of the RTS are as follows: 1. System Redundancy Requirements The review should confirm that the system redundancy requirements are satisfied.. Generally, .a minimum degree of redundancy of one satisfies RTS requirements. Most RTS parameters are monitored by four sensor channels with only two channels required to initiate the RTS logic channel protective action. Where it is determined that the spatial dependence of a parameter requires several sensor channels to assure core protection, the redundancy require- ments are determined for