Document: NRC Regulatory Guide
Document ID: 2980f2d9-2e7d-4afa-9e1f-a8abe5fb7507
Document Type: regulatory_guide
Title: Software Requirement Specifications for Digital Computer Software and Complex Electronics Used in Safety Systems of Nuclear Power Plants + HISTORY - HISTORY 08/2012 – DG-1209 , Proposed Revision 1 08/1996 – DG-1058 , Proposed Revision 0 (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1030/ML103080963.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.172
CFR Part: 
CFR Title: 

Content:
standards is part of an overall approach to meeting the requirements of 10 CFR Part 50 when developing safety systems for nuclear power plants. A licensee’s compliance with these standards does not guarantee that it will meet regulatory requirements. However, the licensee’s compliance with these standards does ensure that it will incorporate practices accepted within various technical communities into the development and quality assurance processes used 1 The term “safety systems” is synonymous with “safety-related systems.” The GDC of Appendix A to 10 CFR Part 50 cover systems, structures, and components “important to safety.” However, the scope of this regulatory guide is limited to “safety systems,” which are a subset of “systems important to safety.” DG-1209, Page 3 to design safety systems. These practices are based on past experience and represent industry consensus on approaches used for the development of such systems. Several criteria in Appendix A to 10 CFR Part 50 describe functions that are part of the design bases of nuclear power plants and that would be included in the SRSs of any digital computer software that is part of the basic components that perform these functions. These listed criteria include part of GDC requirements such as: GDC 1, “Quality Standards and Records,” GDC 12, “Suppression of Reactor Power Oscillations,” GDC 13, “Instrumentation and Control,” GDC 19, “Control Room,” GDC 20, “Protection System Functions,” GDC 22, “Protection System Independence,” GDC 23, “Protection System Failure Modes,” GDC 24, “Separation of Protection and Control Systems,” GDC 25, “Protection System Requirements for Reactivity Control Malfunctions,” and GDC 28, “Reactivity Limits.” In addition to the criteria of Appendix A, this regulatory guide refers to software incorporated into the instrumentation and control systems covered by Appendix B to 10 CFR Part 50 as “safety system software.” The