Document: NUREG-0800
Document ID: debf22b1-f3aa-4c75-a43c-f162d22de1c8
Document Type: srp
Title: of the plant safety analysis report (SAR).  Although the NRC did not endorse the annexes of
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1515/ML15159A491.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.6
CFR Part: 
CFR Title: 

Content:
ting 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 Draft Revision 2 – August 2015 Since there is no 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. 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. Clause 7) There is no guidance beyond the requirements of IEEE Std 603-1991. 8. POWER SOURCE REQUIREMENTS (IEEE Std 7-4.3.2, 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. SECURE DEVELOPMENT AND OPERATIONAL ENVIRONMENT FOR THE PROTECTION OF DIGITAL SAFETY SYSTEMS Regulatory Guide 1.152 describes digital safety system guidance for the establishment of an SDOE. 10. REFERENCES 1. EPRI