Document: NUREG-0800
Document ID: a9242e96-646c-405b-bcbe-0f249e45b75c
Document Type: srp
Title: Appendix 7-A
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0525/ML052500544.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
ary to assure a quality product in keeping with the required safety function." 10 CFR 50 Appendix B, Criterion III, "Design Control," requires in part that, "where a test program is used to verify the adequacy of a specific feature in lieu of other verifying or checking processes, it shall include suitable qualification testing of a prototype unit under the most adverse design conditions. 2. Relevant Guidance Reg. Guide 1.75, "Physical Independence of Electrical Systems," endorses IEEE Std 384, "IEEE Standard Criteria for Independence of Class 1E Equipment and Circuits," which identifies specific electrical isolation criteria for isolation devices used in instrumentation and control circuits. These isolation criteria form part of the basis for this BTP. Reg. Guide 1.153, "Criteria for Power, Instrumentation, and Control Portions of Safety Systems," endorses IEEE Std 603, "IEEE Standard Criteria for Safety Systems for Nuclear Power Generating Stations." Section 5.6.3.2 of IEEE Std 603 provides guidance on the requirements for isolation devices. Rev. 4 — June 1997 Appendix 7-A BTP HICB-11-2 The following industry standards should be considered, as appropriate to the technology, application, and configuration of the isolation device being qualified: ANSI Std C37.90.a/IEEE Std 472, "IEEE Guide for Surge Withstand Capability (SWC) Tests," identifies acceptable guidance for testing the surge withstand capability of static relays used as isolation devices, provided that the electrical environment at the device installation is shown to be adequately bounded by the waveform characteristics. This standard has been redesignated as ANSI Std C37.90.1, "IEEE Standard Surge Withstand Capability (SWC) Tests for Protective Relays and Relay Systems," and its scope is currently intended for electrical protective relaying applications. ANSI Std C62.41, "IEEE Recommended Practice on Surge Voltages in Low-Voltage AC Power Circuits," (Formerly IEEE Std 587) provides acceptable guidance