Document: NUREG-0800
Document ID: 899b3059-69f1-4f7b-bead-1d58e5f4870f
Document Type: srp
Title: Revision 5 - March 2007
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550080.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 # ML070550080. NUREG-0800 U.S. NUCLEAR REGULATORY COMMISSION STANDARD REVIEW PLAN BRANCH TECHNICAL POSITION 7-11 GUIDANCE ON APPLICATION AND QUALIFICATION OF ISOLATION DEVICES 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 electrical isolation devices to allow connections between redundant portions of safety systems or between safety and non-safety systems. This BTP deals with the criteria and methods used to confirm that the design of isolation devices assures that credible failures in the connected non-safety or redundant channels will not prevent the safety systems from meeting their required functions. Guidance for other aspects of isolation device qualification (e.g., electromagnetic compatibility, environmental and seismic qualification) may be found in Standard Review Plan (SRP) Appendix 7.1-B subsection 4.4, SRP Appendix 7.1-C subsection 5.4, and SRP Appendix 7.1-D subsection 5.4. The devices that provide isolation between safety and non-safety portions of power distribution systems are addressed in SRP Chapter 8. BTP 7-11-2 Revision 5 - March 2007 Communication independence between safety systems and non-safety systems is not discussed in this BTP. Refer to SRP Appendix 7.1-C subsection 5.6 and SRP Appendix 7.1-D subsection 5.6. 1. Regulatory Basis 10 CFR 50.55a(h), “Protection and Safety Systems,” requires compliance with IEEE