Document: NUREG-0800
Document ID: 9bcad4cd-a055-4dc1-9315-db9d703e6f6f
Document Type: srp
Title: ENVIRONMENTAL QUALIFICATION OF MECHANICAL AND ELECTRICAL
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1634/ML16343A167.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.11
CFR Part: 
CFR Title: 

Content:
al conditions associated with normal operation, maintenance, testing, and postulated accidents, including LOCAs. Components must be protected against dynamic effects, including those of missiles, pipe whipping, and discharging fluids, that may result from equipment failures and from events and conditions outside the nuclear power unit. GDC 4 is applicable to this section since it provides the requirement that components important to safety be designed to accommodate the effects of, and be compatible with, the environmental conditions associated with normal operation, maintenance, testing, and postulated accidents, including LOCAs. Meeting GDC 4 ensures that equipment important to safety are environmentally designed and qualified, and provides assurance that the equipment will be able to accommodate the effects of, and be compatible with, the environmental conditions associated with normal operation, maintenance, testing, and postulated accidents, including LOCAs. 6. Compliance with GDC 23, “Protection System Failure Modes,” requires that protection systems be designed to fail in a safe state, or in a state demonstrated to be acceptable on some other defined basis, if conditions such as postulated adverse environments (e.g., extreme heat or cold, pressure, steam, water, or radiation) are experienced. GDC 23 is applicable to this section since the environmental design and qualification of protection systems must ensure that the protection systems will fail in a safe state, or in a state demonstrated to be acceptable on some other defined basis, if they are subjected to harsh conditions such as postulated adverse environments. Components in the scope of this section that are subject to environmental design and qualification requirements must consider the failure mode of the equipment. Meeting GDC 23 provides assurance that the failure mode of protection system components is considered in the environmental design and qualification process. 3.11 -19 Draft Revision 4