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:
ls are identified, the proof of meeting the goals should include the software. The method for determining reliability may include combinations of analysis, field experience, or testing. Software error recording and trending may be used in combination with analysis, field experience, or testing. Additional guidance is provided in Subsection 5.15 of SRP Appendix 7.1-C. As stated, in Regulatory Guide 1.152, The NRC does not endorse the concept of quantitative reliability goals as the sole means of meeting the NRC’s regulations for reliability of digital computers in safety systems. Quantitative reliability determination, using a combination of analysis, testing, and operating experience, can provide an added level of confidence in the reliable performance of the computer system. Appendix 7.1-D-20 March 2007 Since there is not a widely accepted view on software reliability value, determining a failure probability and therefore a reliability value is not possible. The reviewer should be cautious if vendors or licensees offer such a value. The NRC staff relies on the vendor using a high quality process of software design to obtain high quality software. The reviewer should expect the software to be of the highest quality, but should not depend on the software being perfect. 6. SENSE AND COMMAND FEATURES — FUNCTIONAL AND DESIGN REQUIREMENTS (IEEE Std 7-4.3.2-2003 Clause 6) There is no guidance beyond the requirements of IEEE Std 603-1991. 7. EXECUTE FEATURES — FUNCTIONAL AND DESIGN REQUIREMENTS (IEEE Std 7- 4.3.2-2003 Clause 7) There is no guidance beyond the requirements of IEEE Std 603-1991. 8. POWER SOURCE REQUIREMENTS (IEEE Std 7-4.3.2-2003 Clause 8) The reviewer should refer to Subsection 8 of SRP Appendix 7.1-C for guidance on implementation of the requirements of IEEE Std 603-1991. 9. CYBER SECURITY CRITERIA Sub-Clause 5.9 of IEEE Std 603-1991 states, “The design shall permit the administrative control of access to safety system equipment. These