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:
l design and qualification of active mechanical equipment in nuclear power plants. QME-1-2007, Appendix QR-B, “Guide for Qualification of Nonmetallic Parts,” recommends a methodology and describes the documentation that should be available to demonstrate the qualification of nonmetallic parts, materials, or lubricants. It addresses the steps for the user of active mechanical equipment to follow to qualify and maintain the qualification of nonmetallic material that is part of active mechanical equipment. The NRC staff considers Non- mandatory Appendix QR-B to provide a reasonable approach to the qualification of nonmetallic material in active mechanical equipment. As stated in RG 1.100, “when a licensee commits to use a non-mandatory appendix in ASME QME-1-2007 [such as Appendix QR-B] for its qualification of active mechanical equipment, then the criteria and procedures delineated in [Appendix QR-B] become part of the basis for its qualification program, unless specific deviations are requested and justified.” 17. The effects of chemical exposure must be addressed in the environmental qualification process. The concentration of chemicals used for qualification must be equivalent to, or more severe than, that resulting from the most limiting mode of plant operation (e.g., emergency core cooling system initiation, or recirculation phase). If the chemical composition of the chemical spray can be affected by equipment malfunctions, the most severe chemical environment that results from a single failure in the spray system must be assumed. If only demineralized water spray is used, then the effect of the demineralized water spray must be included in the equipment qualification. 18. Environmental design means that components shall be designed to accommodate the effects 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