Document: NUREG-0800
Document ID: 5292500f-1078-455c-aa35-aea15092636c
Document Type: srp
Title: ENGINEERED SAFETY FEATURES SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1602/ML16020A082.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.3
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CFR Title: 

Content:
ria to computer-based safety systems. SRP Appendix 7.1-D, “Guidance for Evaluation of the Application of IEEE Std 7-4.3.2,” provides SRP acceptance criteria for safety and protection systems using digital computer-based technology. 4. Item II.Q, “Defense against Common-Mode Failures in Digital Instrument and Control Systems,” of the Staff Requirements Memorandum on SECY-93-087, “Policy, Technical, and Licensing Issues Pertaining to Evolutionary and Advanced Light Water Reactor (ALWR) Designs,” provides guidance on Diversity and Defense-in-Depth. SRP BTP 7-19, “Guidance for Evaluation of Diversity and Defense-in-Depth in Digital Computer-Based Instrumentation and Control Systems,” provides additional guidance. III. REVIEW PROCEDURES The reviewer will select material from the procedures described below, as may be appropriate for a particular case. Typical reasons for a non-uniform emphasis are the introduction of new design features or the utilization in the design of features previously reviewed and found acceptable. These review procedures are based on the identified SRP acceptance criteria. For deviations from these specific acceptance criteria, the staff should review the applicant’s evaluation of how the proposed alternatives to the SRP criteria provide an acceptable method of complying with the relevant NRC requirements identified in Subsection II. 7.3-8 Revision 6 – August 2016 SRP Section 7.1 describes the general procedures to be followed in reviewing any instrumentation and control system. This part of SRP Section 7.3 highlights specific topics that should be emphasized in the ESFAS review. 1. The review should include an evaluation of the ESFAS design against the requirements of IEEE Std 603-1991 or IEEE Std 279-1971, depending upon the applicant’s or licensee’s commitment regarding these design criteria. For computer-based ESFAS, guidance is provided by IEEE Std 7-4.3.2 as endorsed by RG 1.152. These procedures are detailed in SRP