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:
d 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 for describing and characterizing the surge environment in low-voltage AC power circuits for low, medium, and high exposure levels. ANSI Std C62.45, "IEEE Guide on Surge Testing for Equipment Connected to Low-Voltage AC Power Circuits," provides acceptable guidance for surge testing of equipment connected to low-voltage AC power circuits. ANSI Std C62.36, "IEEE Standard Test Methods for Surge Protectors Used in Low-Voltage Data, Communications, and Signaling Circuits," provides guidance for test methods for surge protectors used in low-voltage data, communications, and signaling circuits. This guidance is acceptable where credit is taken for surge protection in these types of circuits. The standards above address electrical surges to the device. EMI/RFI considerations are addressed in SRP Section 7.1. 3. Purpose The purpose of this BTP is to provide guidance to address the application and qualification of isolation devices through the application of maximum credible fault and surge withstand capability. This BTP has three objectives: • Confirm that the design of isolation devices conform to the guidance of Reg. Guides 1.75 and 1.153. • Confirm that the qualification basis for isolation devices is consistent with accepted industry standards and use in the plant. • Confirm that qualification testing demonstrates that the isolation devices meet the acceptance criteria of ANSI/IEEE Std 279 and the guidance of Reg. Guide 1.153. B. Branch Technical Position 1. Introduction This BTP addresses the electrical qualification and application of isolation devices. Other qualification requirements (such as those that pertain to environmental conditions, EMI/RFI, and seismic events) are addressed in Section 7.1. IEEE Std 384 defines a maximum credible voltage or current