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:
otection of Nuclear Power Plants,” provides guidance for design and installation of lightning protection systems to ensure that electrical transients resulting from lightning phenomena do not render safety-related systems inoperable or cause spurious operation of such systems. 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 fault1 (MCF) voltages and currents. This BTP has three objectives: • Confirm that the design and implementation of isolation devices conforms to the guidance of Regulatory Guide 1.75. • 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 IEEE Std 603-1991 or IEEE Std 279-1971. 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 SRP Section 7.1. The following types of isolation devices are examples of devices that have been found to be acceptable, provided the guidelines of this BTP are satisfied: • Isolation amplifiers. • Isolation transformers. • Fiber optic couplers. • Fiber optic cable.2 • Photo-optic couplers. • Relays (coil to contact isolation). BTP 7-11-5 Revision 5 - March 2007 Qualification of isolation devices should be based on a combination of design analysis and qualification testing. The analysis should demonstrate the adequacy of the design, considering the range of possible fault conditions and variability between individual units. The qualification testing should validate the results of the analysis at the extremes of fault conditions. 2. Information to be Reviewed Information to be reviewed includes