Document: NUREG-0800
Document ID: 21a25622-c805-4d35-996c-a62a763f51a4
Document Type: srp
Title: describes the general procedures to be followed in reviewing any instrumentation and control
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0525/ML052500503.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.1
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CFR Title: 

Content:
system. Section 7.3 highlights specific topics that should be emphasized in the ESFAS review. The review should include an evaluation of the ESFAS design against the requirements of ANSI/IEEE Std 279, or Reg. Guide 1.153 (which endorses IEEE Std 603), depending upon the applicant/licensee's commitment regarding these design criteria. This procedure is detailed in Appendix 7.1-B for ANSI/IEEE Std 279 and in Appendix 7.1-C for IEEE Std 603. The procedures in Appendices 7.1-B and 7.1-C address specific design requirements only. For example, paragraph 4.9 of ANSI/IEEE Std 279 requires that the design include the means for checking the availability of each system input sensor during operation. Appendix 7.1-B outlines a procedure that can be used to determine whether or not this requirement is met. SRP 7.3-5 Rev. 4 — June 1997 SRP 7.3-5 Appendices 7.1-B and 7.1-C discuss the requirements of ANSI/IEEE Std 279 and IEEE Std 603, and how they are used in the review of the ESFAS. Although the primary emphasis is on the equipment comprising the ESFAS, the reviewer must consider the overall ESF functions on a system level. The ESFAS design should be compatible with the SAR Chapter 15 design bases accident analyses. It is not sufficient to evaluate the adequacy of the ESFAS only on the basis of the design meeting the specific requirements of ANSI/IEEE Std 279 or IEEE Std 603. The ESFAS review should address the applicable topics identified in Table 7-1. Appendix 7.1-A describes review methods for each topic. Major design considerations that should be emphasized in the review of the ESFAS are identified below. • Design basis — See Appendix 7.1-B item 1 or Appendix 7.1-C item 4. • Single-failure criterion — See Appendix 7.1-B item 3 or Appendix 7.1-C item 6. • Quality of components and modules — See Appendix 7.1-B item 4 or Appendix 7.1-C item 8. • Independence — See Appendix 7.1-B items 7 and 8 or Appendix 7.1-C items 11 and 24. • Completion of protective