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:
n of IEC 61000-6-4 tests is acceptable to the NRC staff in the form of two options. In the first option, the identified IEC emissions tests are acceptable as a standalone program if the two conditions for omitting low frequency emissions testing are met: 1) power quality controls are in place, eliminating the need to perform the CE101 test and the lower frequency band of the CE102 test and 2) separation from equipment that is sensitive to magnetic fields is maintained, eliminating the need to perform the RE101 test. In the second option, the IEC emissions tests should be supplemented by complementary MIL-STD-461G tests to evaluate emissions in the low-frequency band. Specifically, the CE101 test, CE102 test (from 10 kHz to 150 kHz), and RE101 test should be performed. Figure 3.5 shows the acceptable emissions testing programs and indicates the conditions under which the alternative test suites can be applied. It should be noted that the use of specific MIL-STD-461G emissions tests to supplement the frequency range coverage of the IEC emissions tests does not constitute endorsement of unrestrained mixing and matching of test methods among the suites of tests. The absence of low-frequency emissions test guidance from the IEC, the non-intrusive nature of the test methods themselves, and the comparability of emissions measurement data justifies the specific combination of test methods to ensure acceptable frequency range coverage when the low-frequency emissions test omission criteria identified above are not satisfied. DG-1333, Page 16 Figure 3.5 Acceptable Alternatives for EMI/RFI Emissions Testing 4. EMI/RFI Susceptibility Testing Specific test methods from MIL-STD-461G and IEC 61000-4 are acceptable to the NRC staff for performing susceptibility testing of safety-related I&C systems intended for installation in nuclear power plants. These test methods are identified in the guidance below and may be applied in the indicated combinations subject to the clarifications