Document: NUREG-0800
Document ID: f1629507-6318-4e71-94a6-9d6664ba96a3
Document Type: srp
Title: of the plant safety analysis report (SAR).  Although NRC did not endorse the annexes of
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070660327.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.6
CFR Part: 
CFR Title: 

Content:
ificant emphasis on defense-in-depth against common-cause failures within and between functions. SRP BTP 7-19 provides guidance for evaluating diversity and defense-in-depth features. SRP BTP 7-19 has the following objectives: (1) To verify that adequate diversity has been provided in the design of the digital system to meet the criteria established by NRC requirements, (2) To verify that adequate defense-in-depth has been provided to meet NRC criteria, and (3) To verify that the displays and manual controls for critical safety functions initiated by operator actions are diverse from the computer systems used in the automatic actuation of plant safety systems. 5.2. Completion of Protective Action (IEEE Std 7-4.3.2-2003 Clause 5.2) The reviewer should refer to Subsection 5.2 of SRP Appendix 7.1-C for guidance on the implementation of the requirements of IEEE Std 603-1991. 5.3. Quality (IEEE Std 7-4.3.2-2003 Clause 5.3) The applicant/licensee should confirm that quality assurance provisions of Appendix B to 10 CFR Part 50 are applied to the safety 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 criteria described in Clause 5.3 of IEEE Std 7-4.3.2-2003. Hardware quality is addressed in IEEE Std 603-1991. Software quality is addressed in IEEE/EIA Std 12207.0-1996 and supporting standards. In addition to the requirements of IEEE Std 603-1991, the following activities necessitate additional criteria that are applicable to the quality criterion. The criteria are provided in the following clauses of IEEE Std 7-4.3.2-2003: 5.3.1 Software development 5.3.2 Software tools 5.3.3, 5.3.4 Verification and validation, Independent verification and validation requirements 5.3.5 Software configuration management 5.3.6 Software project risk management EPRI Topical Report TR-106439, “Guideline on Evaluation and Acceptance of