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:
should be performed for both horizontally and vertically polarized fields. Figure 3.4 Electric-Field Radiated Emissions Envelopes 3.5 IEC Emissions Tests The IEC 61000-6-4 tests address measurement of emissions for electrical and electronic equipment intended for use in industrial environments in the frequency range from 150 kHz to 6 GHz. IEC 61000-6-4 incorporates the test methods of CISPR 16 by reference. Conducted emissions testing covers the frequency range from 150 kHz to 30 MHz. Radiated emissions testing covers the frequency range from 30 MHz to 6 GHz. The IEC test methods are acceptable to the NRC staff for demonstrating emissions compliance in the high-frequency band for safety-related I&C systems and non-safety-related I&C systems intended for installation in nuclear power plants. However, since no test methods are provided by IEC to measure low-frequency conducted or radiated emissions, the application of these tests is limited to two options, which are described below. The first option under which the application of the IEC emissions tests is acceptable involves the following two conditions that justify the omission of low-frequency emissions testing. First, power quality controls are in place, which eliminates the need to perform the CE101 test and the lower frequency band of the CE102 test. Second, separation from equipment that is sensitive to magnetic fields is maintained, making it is unnecessary to perform the RE101 test. These conditions for omission are discussed in the endorsement of CE101, CE102, and RE101. DG-1333, Page 15 The second option under which the application of the IEC emissions tests is acceptable involves supplementing the IEC emissions testing with MIL-STD-461G testing to account for the gaps in coverage across the low-frequency band. Specifically, the CE101 test should be performed to evaluate conducted emissions from 30 Hz to 10 kHz, the CE102 test should be performed across the lower range of its frequency band to evaluate