Document: NUREG-0800
Document ID: 409035a3-eae4-4524-8ae0-ca7775f4072a
Document Type: srp
Title: Revision 5 - March 2007
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550073.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
lear Regulatory 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 Web site 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 # ML070550073. NUREG-0800 U.S. NUCLEAR REGULATORY COMMISSION STANDARD REVIEW PLAN BRANCH TECHNICAL POSITION 7-18 GUIDANCE ON THE USE OF PROGRAMMABLE LOGIC CONTROLLERS IN DIGITAL COMPUTER-BASED INSTRUMENTATION AND CONTROL SYSTEMS REVIEW RESPONSIBILITIES Primary - Organization responsible for the review of instrumentation and controls Secondary - None A. BACKGROUND This branch technical position (BTP) provides guidelines for reviewing the use of programmable logic controllers (PLCs) in instrumentation and control (I&C) systems. These guidelines are based on reviews of licensee submittals and the analysis of PLC-related issues documented in NUREG/CR-6090, “The PLC and Its Application in Nuclear Reactor Protection Systems.” 1. Regulatory Basis 10 CFR 50 Appendix A, General Design Criterion 1, “Quality Standards and Records,” requires in part that “structures, systems, and components important to safety shall be designed, fabricated, and tested to quality standards commensurate with the importance of the safety functions to be performed.” BTP 7-18-2 Revision 5 - March 2007 10 CFR 50 Appendix A, General Design Criterion 21, “Protection System Reliability and Testability,” requires in part that “the protection system shall be designed for high functional reliability … commensurate with the safety functions to be performed.” 2. Relevant Guidance Regulatory Guide 1.152, Revision 2, “Criteria for Digital Computers in Safety Systems of Nuclear Power Plants,” provides guidance for complying with