Document: NUREG-0800
Document ID: 4926757d-c89a-498c-a8cb-918908ab5496
Document Type: srp
Title: of the SAR should provide this information.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350467.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.3
CFR Part: 
CFR Title: 

Content:
ts safety function. In this regard, the loss of an environmental control system is treated as a single failure which should not prevent the protec- tion system from accomplishing its safety functions. In that loss of environmental control systems do not usually result in prompt changes in environmental conditions, the design bases may rely upon monitoring environmental conditions in areas and taking appropriate action to assure 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 should confirm that there is independence between environmental control systems and sensing systems which would indicate the failure or malfunctioning of environmental control systems. The evaluation of conformance to the requirements of GDC 2 and 4 satisfies the requirements for equipment qualification to harsh environments'and seismic events. Guidance for the review of this aspect of equipment qualification is given in Appendix A to SRP Section 7.1. 6. Section 4.5, Channel Integrity - Information provided in Sections 3(7) and 3(8) is reviewed to confirm that the design includes the qualification of equipment for the conditions identified in the design bases. Consequen- tial failures are not an acceptable base for satisfying this requirement. The review should confirm that tests have been conducted on protection system equipment components and the system racks and panels as a whole to demonstrate the functional performance requirements of the protection system over the range of transient and steady-state conditions of both the energy supply and the environment. Where tests have not been conducted, the applicant thould confirm that the protection system components are conservatively designed to operate over the range of service conditions. 7. Section 4.6, Channel Independence - Guidance for evaluation of channel independence is provided in IEEE Std