Document: NUREG-0800
Document ID: 478329d7-b28f-4334-99e3-c149e19d1cdd
Document Type: srp
Title: ENVIRONMENTAL QUALIFICATION OF MECHANICAL AND ELECTRICAL EQUIPMENT
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340658.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.11
CFR Part: 
CFR Title: 

Content:
cal environment that results from a single failure in the spray system should be assumed. If only demineralized water 3.11-4 Rev. 2 - July 1981 spray is used then the effect of the demineralized water spray should be included in the equipment qualification. Radiation dose and dose rate used to determine the radiation environment for qualification of electrical and mechanical equipment shall be based on NRC staff approved source term and methodology as discussed in NUREG-0588 and supplemented by Section II.B.2 of NUREG-0737 and NUREG-0718. The radiation environment shall be based on the integrated effects of the normally expected radiation environment over the equipment's installed life plus that associ- ated with the most severe design basis event during or following which the equipment is required to remain functional. Effects of the beta radiation shall also be considered in the qualification program. Effect of recircula7 tory fluid shall be considered for the equipment located outside the containment. MILD ENVIRONMENT The environmental qualification of all electrical and mechanical equipment located in the mild environment is acceptable if the following procedure is followed: The documentation required to demonstrate qualification of equipment in a mild environment are the uDesign/Purchasefl specifications. The specifications shall contain a description of the functional require- ments for its specific environmental zone during normal and abnormal environmental conditions. A well supported maintenance/surveillance program in conjunction with a good preventive maintenance program will suffice to assure that equipment that meets the design/purchase specifications is qualified for the designed life. Furthermore the maintenance/surveillance program data and records shall be reviewed periodically (not more than 18 months) to ensure that the design qualified life has not suffered thermal and cyclic degradation resulting from the accumulated stresses triggered by the