Document: NRC Regulatory Guide
Document ID: 908489d1-a222-483d-b60e-5162228a4844
Document Type: regulatory_guide
Title: Application of the Single-Failure Criterion to Safety Systems + HISTORY - HISTORY 12/2016 – Periodic Review of Revision 2 – Issues identified for future consideration 10/2011 – Periodic Review of Revision 2 – No issues identified Prior to the issuance of Revision 1, RG 1.53 was entitled "Application of the Single-Failure Criterion to Nuclear Power Plant Protection Systems" 05/2002 – DG-1118 , Proposed Revision 1 (Rev. 2)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1634/ML16349A071.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.53
CFR Part: 
CFR Title: 

Content:
for General Principles of Reliability Analysis of Nuclear Power Generating Station Protection Systems,” as indispensable normative references. IEEE Std 7-4.3.2 provides standard criteria for digital computers in safety systems while IEEE Std 352 is a guide for general principles for reliability analysis. Both normative references include methods to address CCFs. IEEE Std 379-2014 identifies IEEE Std 7-4.3.2-2010 as an example of a standard which addresses the analysis and the design techniques for prevention of CCFs for safety systems containing digital computers. IEEE Std 379-2014 states IEEE Std 352 should be used to identify and screen out CCF mechanisms not normally considered in an analysis of independent component failures. IEEE Std 352-1987 is not endorsed by NRC regulatory guide, but it is referenced by Clause 5.15 of IEEE Std 603-1991, “IEEE Standard Criteria for Safety Systems for Nuclear Power Generating Stations,” which is included in regulation by reference. Additionally, there is a proposed Draft 6 February 2016 edition of IEEE Std 352. Both IEEE Std 352 editions include an extended qualitative analysis for CCF to assess likelihood and gain maximum assurance CCF likelihood is sufficiently low. Neither the latest edition of IEEE Std 7-4.3.2 nor IEEE Std 352 have been endorsed by the NRC as providing acceptable methods for addressing CCF. As such, there is a need to coordinate any future revision of RG 1.53 with the regulatory infrastructure modernization activities under the “Integrated Action Plan to Modernize Digital Instrumentation and Controls Regulatory Infrastructure,” (IAP) (ADAMS Accession No. ML16097A182). Likewise, any future endorsement of IEEE Std 379-2014 via a revision of RG 1.53 should be pursued Regulatory Guide Periodic Review Regulatory Guide 1.53 in a coordinated and consistent fashion with the IAP activities to prevent additional technical or regulatory issues. 2. What is the impact on internal and external stakeholders of