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:
signals. With recent advances in analog electronics, many of the functions currently being performed by several analog circuit boards could be combined into a single analog circuit board operating at reduced voltage levels, thereby making analog circuitry more susceptible to EMI/RFI, power surge, and electrostatic discharge as well. Hence, treatment of operational and functional issues related to safety in the nuclear power plant environment must address the possibility of upsets and malfunctions in I&C systems caused by EMI/RFI, power surge, and electrostatic discharge. This RG endorses design, installation, and testing practices acceptable to the NRC staff for identifying and addressing the effects of EMI/RFI, power surge, and electrostatic discharge on safety- related I&C systems in a nuclear power plant environment. The guidance applies to both safety-related I&C systems and non-safety-related I&C systems whose failure can affect safety functions. The endorsed practices are also acceptable for identifying and evaluating the EMI/RFI effects of non-safety-related equipment that are intended for installation in close proximity to safety-related equipment. Thus, the endorsed practices can be applied for the control of electromagnetic emissions from non-safety-related I&C and electrical systems to ensure that nearby safety-related I&C systems can continue to perform properly in the nuclear power plant environment. The changes implemented in this revision of this RG include endorsing current versions of the previously endorsed EMC standards. This RG revision extends the guidance to endorse updates in the test methods, adds a test method for electrostatic discharge (ESD), adjusts frequency ranges when appropriate, DG-1333, Page 6 and relaxes operating envelopes (test levels) where experience and confirmatory research warrants. Conditions under which specific test criteria may be omitted are also offered based on technical considerations. The updated standards that are