Document: NRC Regulatory Guide
Document ID: 12dd3f35-6baa-4f6a-8372-84c90ef96a91
Document Type: regulatory_guide
Title: Test Documentation for Digital Computer Software Used in Safety Systems of Nuclear Power Plants + HISTORY - HISTORY 08/2012 – DG-1207 , Proposed Revision 1 08/1996 – DG-1056 , Proposed Revision 0 (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0833/ML083370243.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.170
CFR Part: 
CFR Title: 

Content:
vice. Clause 10.2.1 of IEEE Std. 829-2008 describes other features in a given test design and not the specific LTD objective that may be exercised but not identified. The licensee should formally test all associated features in the safety system and follow the recommended testing activity process outlined under Clause 5. 5. Traceability Criterion XI requires that testing demonstrate that systems and components will perform satisfactorily in service. Traceability analyses relating functions and test cases provide a means for ensuring that all functions are tested (IEEE Std. 1012-2004). The planning for software V&V addresses these analyses. Clause 8.1.3 of IEEE Std. 829-2008 requires that the applicants and licensees list all applicable reference documentation as part of the life-cycle process and with the concerning test documentation derived from Clause 8 through Clause 17. The test documentation from Clause 8 through Clause 17 should include these references unless the licensee maintains equivalent traceability information elsewhere in the V&V records. 6. Integrity Levels Clause 4 of IEEE Std. 829-2008 defines a four-level method of quantifying software integrity levels in which Level 4 is the highest and Level 1 is the lowest. The standard requires the applicant or licensee to either use the method in the standard or define another method and provide a mapping between its method and the method defined in the standard. The NRC staff takes exception to the Table B.3, “Risk assessment scheme” in Annex B. The IEEE Std. 829-2008 statement about the Table B.3 illustration for determining the likelihood and evaluating software integrity level lower than Level 4 is not acceptable. The likelihood of occurrence is likely to cause catastrophic consequence and thus the breadth or depth of testing and documentation should adhere to the proper activities for a nuclear software safety system product. The licensee or applicant should assign integrity level 4 or the