Document: NUREG-0800
Document ID: f4b8f0c1-9a14-46be-88c9-a6cb74d64dff
Document Type: srp
Title: Rev. 4 — June 1997
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0525/ML052500499.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
es in digital I&C systems for future light-water reactors is given in the Staff Requirements Memorandum on SECY-93-087, "Policy, Technical, and Licensing Issues Pertaining to Evolutionary and Advanced Light-Water Reactor (ALWR) Designs" (specifically in point 18: II Q, "Defense Against Common-Mode Failures in Digital Instrumentation and Control Systems). BTP HICB-19 provides guidance for addressing the potential of common-mode failures. 7. Section 5.2 — Completion of Protective Action The Staff review of this item should include review of functional and logic diagrams to ensure that "seal-in" features are provided to enable system-level protective actions to go to completion. 8. Section 5.3 — Quality The applicant/licensee should confirm that quality assurance provisions of Appendix B to 10 CFR 50 are applicable to the safety protection system. The evaluation of the adequacy of the quality assurance program is addressed in the review of Chapter 17 of the SAR. For digital computer-based systems, the applicant/licensee should address the quality requirements described in Section 5.3 of IEEE Std 7-4.3.2. BTP HICB-14 describes the characteristics of a software development process that the Staff may evaluate when assessing compliance with Sections 5.3.1, 5.3.4, and 5.3.5 of IEEE Std 7-4.3.2. The quality exhibited by the software engineering process and the products of that process should be appropriate to the safety significance of the safety system. EPRI TR-106439 "Guideline on Evaluation and Acceptance of Commercial Grade Digital Equipment for Nuclear Safety Applications," provides guidance for the evaluation of existing commercial computers and software to comply with the requirements of Section 5.3.2 of IEEE Std 7-4.3.2. The guidance of BTP HICB-14 may be applied to the evaluation of vendor processes described in EPRI TR-106439. The guidance of BTP HICB-14 or the guidance of EPRI TR-106439 may be applied to the qualification of software tools, as discussed in