Document: NUREG-0800
Document ID: f4b8f0c1-9a14-46be-88c9-a6cb74d64dff
Document Type: srp
Title: Rev. 4 — June 1997
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0525/ML052500499.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
ich safety system equipment is located, will not result in conditions which could result in damage to the safety system equipment, nor prevent the balance of the safety system not within the area from accomplishing its safety function. In this regard, the loss of an environmental control system is treated as a single failure that should not prevent the safety system from accomplishing its safety functions. 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 non-damage 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 which 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 conform with the guidance of Reg. Guide 1.151. EMI qualification in accordance with the guidance of EPRI TR-102323, "Guidelines for Electromagnetic Interference Testing in Power Plants," 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 NFPA Std 78, "Lightning Protection Code," and ANSI/IEEE Std 665, "Guide for Generation Station Grounding." The EELB and EMEB evaluation of conformance to the requirements of GDC 2 and 4 and 10 CFR 50.49 satisfy the requirements for equipment qualification to harsh environments and seismic events. Guidance for the review of this equipment qualification is given in SRP Sections 3.10 and