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:
ects of environmental conditions and is required for all important to safety equipment located in either mild or harsh environments in accordance with 10 CFR Part 50, Appendix A. A mild environment is defined in 10 CFR 50.49 as an environment that would not be significantly more severe than the environment that would occur during normal plant operation. The NRC regulations in 10 CFR 50.49 specify environmental qualification requirements to verify the design by test or a combination of test and analyses for certain electric and I&C equipment important to safety located in harsh environments. 1 The NRC staff is completing a revision to Regulatory Guide 1.100 to accept the 2013 edition of IEEE Std. 344 and the 2012 edition of QME-1 for use by applicants and licensees, and this Revision 4 of the guide should be used when final. Conforming updates to this SRP section will be made in a future revision. 3.11 -15 Draft Revision 4 – December 2017 19. Mechanical components important to safety must be designed to be compatible with postulated environmental conditions, including those associated with loss-of-coolant accidents (LOCAs) in compliance with 10 CFR Part 50, Appendix A. Under Appendix B to 10 CFR Part 50, a process must be established to determine the suitability of materials, parts, and equipment needed for safety-related functions. Also, environmental design records for safety-related mechanical equipment must be maintained in accordance with 10 CFR Part 50, Appendix B, and these records must include the results of tests and material analyses used as part of the environmental design process for each mechanical component. For mechanical equipment, the staff concentrates its review on non-metallic materials that are sensitive to environmental effects (e.g., seals, gaskets, lubricants, fluids for hydraulic systems, and diaphragms). The reviewer confirms that the applicant has (1) identified safety-related mechanical equipment located in harsh and mild environment