Document: NUREG-0800
Document ID: 4a295d6b-937a-429e-8fe4-1470b992d859
Document Type: srp
Title: Rev. 0 – November 2009
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0929/ML092950353.pdf
Revision Date: 2023-06
Chapter: 18
Section ID: 18
CFR Part: 
CFR Title: 

Content:
ory Commission, Washington, DC 20555, Attention: Reproduction and Distribution Services Section, or by fax to (301) 415-2289; or by email to DISTRIBUTION@nrc.gov. Electronic copies of this section are available through the NRC’s public website at http://www.nrc.gov/reading-rm/doc-collections/nuregs/staff/sr0800/, or in the NRC’s Agencywide Documents Access and Management System (ADAMS), at http://www.nrc.gov/reading-rm/adams.html, under Accession # ML092950353. NUREG-0800 U.S. NUCLEAR REGULATORY COMMISSION STANDARD REVIEW PLAN APPENDIX 18-A CREDITING MANUAL OPERATOR ACTIONS IN DIVERSITY AND DEFENSE-IN-DEPTH (D3) ANALYSES REVIEW RESPONSIBILITES Primary – Organization responsible for the review of human performance Secondary – Organization responsible for the review of instrumentation and controls A. INTRODUCTION This Appendix defines a methodology, applicable to both existing and new reactors, for evaluating manual operator action as a diverse means of coping with Anticipated Operational Occurrences and Postulated Accidents (AOO/PA) that are concurrent with a software Common Cause Failure (CCF) of the digital instrumentation and control (I&C) protection system. This Appendix supersedes, and incorporates with limited modifications, the guidance in Section 3 of Digital Instrumentation and Control (DI&C) Interim Staff Guidance (ISG), DI&C-ISG-05, Revision 1, “Highly Integrated Control Rooms—Human Factors Issues.” 18-A-2 Rev. 0 – November 2009 B. BACKGROUND Software CCFs of the digital I&C protection system are discussed in the Background of Branch Technical Position (BTP) 7-19, “Guidance for Evaluation of Diversity and Defense-in-Depth in Digital Computer-Based Instrumentation and Control Systems.” To provide additional guidance for BTP 7-19, the U.S. Nuclear Regulatory Commission (NRC) staff issued DI&C ISG-02, “Diversity and Defense-in-Depth Issues,” Revision 1 in September 2007. DI&C-ISG-02, Revision 1, specifically discussed adequate