Document: NUREG-0800
Document ID: 3753585e-008b-4b35-b9e2-35e4a69391d7
Document Type: srp
Title: B-7
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1515/ML15159A226.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.1
CFR Part: 
CFR Title: 

Content:
Draft Revision 6 – August 2015 Because the loss of environmental control systems does not usually result in prompt changes in environmental conditions, the design bases may rely upon monitoring environmental conditions and taking appropriate action to ensure that extremes in environmental conditions are maintained within nondamage limits until the environmental control systems are returned to normal operation. If such bases are used, the applicant/licensee should confirm that there is independence between environmental control systems and sensing systems that would indicate the failure or malfunctioning of environmental control systems. Review of mild environment qualification should also include confirmation that the environmental protection of instrument sensing lines conforms with the guidance of RG 1.151, “Instrument Sensing Lines.” EMI qualification in accordance with the guidance of RG 1.180, “Guidelines for Evaluating Electromagnetic and Radio-Frequency Interference in Safety-Related Instrumentation and Control Systems,” is an acceptable means of meeting the qualification requirements for EMI and electrostatic discharge. Lightning protection should be addressed as part of the review of electromagnetic compatibility. Lightning protection features should conform to the guidance of RG 1.204, “Guidelines for Lightning Protection of Nuclear Power Plants.” The organizations responsible for the review of equipment qualification to harsh environments and seismic events will perform the evaluation of conformance to the requirements of GDC 2 and 4 and 10 CFR 50.49, “Environmental Qualification of Electric Equipment Important to Safety for Nuclear Power Plants,” to ensure the requirements for equipment qualification to harsh environments and seismic events are met. Guidance for the review of this equipment qualification is given in SRP Sections 3.10 and 3.11. 4.5. Channel Integrity (IEEE Std 279-1971, Clause 4.5) Information provided in Clauses 3(7)