Document: NRC Regulatory Guide
Document ID: 82021804-a487-471b-a76c-095315525b53
Document Type: regulatory_guide
Title: Guidelines for Evaluating Electromagnetic and Radio-Frequency Interference in Safety-Related Instrumentation and Control Systems (Rev. 2)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1628/ML16281A531.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.180
CFR Part: 
CFR Title: 

Content:
s to evaluate the electrostatic discharge withstand capability of equipment. Operating envelopes characteristic of the electromagnetic environment in nuclear power plants are cited in this guidance as the basis for establishing acceptable testing levels. Table 1 lists the specific positions on EMC that are set forth below in the Staff Regulatory Guidance. This guidance is applicable to all new safety-related systems or licensee-initiated modifications to existing safety-related systems that include analog, digital, or hybrid systems and components (i.e., analog and digital electronics equipment). Existing installed systems and equipment are not required to undergo additional testing. The emissions control aspects of this guidance also apply to non-safety-related systems and components whose operation can affect safety-related system or component functions. The endorsed test methods for evaluating the electromagnetic emissions, EMI/RFI susceptibility, power surge and electrostatic discharge withstand capabilities of safety-related equipment are intended for application in test facilities or laboratories before installation. The electromagnetic conditions at the point of installation for safety-related I&C systems should be assessed to identify any unique EMI/RFI or power surge sources that may generate local interference. The EMI/RFI sources could include both portable and fixed equipment (e.g., portable transceivers, remote wireless I&C devices, arc welders, power supplies, and generators). In accordance with the EMC practices endorsed herein, measures should be taken to ensure that safety-related I&C systems will not be exposed to EMI/RFI levels from the identified sources, under any plant mode of operation, that are greater than 8 decibel (dB) below the specified operating envelopes. To ensure that the operating envelopes are being used properly, equipment should be tested in a physical configuration that is representative of its actual installation. However,