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:
to be complementary in frequency range coverage within themselves. If emissions test methods from different standards are used and full coverage of frequency ranges is not provided, then supplemental testing should be undertaken to address the gaps or justification for the omission of testing in any frequency range should be documented as part of the test plan. Since the IEC standard does not provide for low-frequency emissions testing, the MIL-STD test methods should be applied for emissions testing in the low-frequency band unless test omissions are justified. When using a combination of IEC and MIL-STD emissions tests (e.g., MIL-STD for low frequency testing and IEC for high-frequency testing), it is necessary to ensure frequency range coverage is maintained. The MIL-STD-461G test methods listed in Table 2 have associated operating envelopes that serve to establish test levels. General operating envelopes that are acceptable to the NRC staff are given below in the guidance on the listed MIL-STD-461G test methods. Likewise, operating envelopes for the IEC 61000-6-4 test methods have been identified that are comparable to their corresponding MIL-STD counterparts and are given below in the IEC emissions testing guidance. These operating envelopes are acceptable for locations where safety-related I&C systems either are, or are likely to be, installed and include control rooms, remote shutdown panels, cable spreading rooms, equipment rooms, auxiliary instrument rooms, relay rooms, and other areas (e.g., the turbine deck) where safety-related I&C system installations are planned. The operating envelopes are acceptable for analog, digital, and hybrid system installations. Where applicable, these standards also describe conditions under which specific test methods may be omitted. DG-1333, Page 12 3.1 CE101—Conducted Emissions, Low Frequency The CE101 test measures the low-frequency conducted emissions on power leads of equipment and subsystems in the frequency 30 Hz