Document: NRC Regulatory Guide
Document ID: e16da529-b6b4-4fdf-bc3f-7490180363f3
Document Type: regulatory_guide
Title: Environmental Qualification of Certain Electric Equipment Important to Safety for Nuclear Power Plants (Rev. 2)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2018/ML20183A423.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.89
CFR Part: 
CFR Title: 

Content:
h DOR Guidelines or NUREG-0588 in lieu of upgrading the qualification of electric equipment to the provisions of 10 CFR 50.49: (1) The item of equipment to be replaced is a component of equipment that is routinely replaced as part of normal equipment maintenance (e.g., gaskets, O-rings, coils); these may be replaced with identical components. . (2) The item to be replaced is a component that is part of an item of equipment qualified as an assembly; these may be replaced with identical components. (3) Identical equipment to be used as a replacement was on hand as a part of the utility's stock before February 22, 1983. The shelf life of this equipment should be addressed for its potential impact on the qualified life. (4) Replacement equipment qualified in accordance with 10 CFR 50.49 does not exist. (5) Replacement equipment qualified in accordance with 10 CFR 50.49 is not available to meet installation and operation schedules. However, in such cases, the replacement equipment may be used only until upgraded equipment can be obtained and an outage of sufficient duration is available for replacement. (6) Replacement equipment qualified in accordance with 10 CFR 50.49 would require significant plant modifications to accommodate its use. (7) The use of replacement equipment qualified in accordance with 10 CFR 50.49 has a significant probability of creating human factor problems that would negatively affect plant safety and performance. Examples of this include the following: (a) Knowledge, skills, and ability of existing plant staff would require significant upgrading to operate or maintain the specific replacement equipment; (b) The use of the replacement equipment would create a one-of-a-kind application; or (c) Maintenance, surveillance, or calibration activities would be unnecessarily complex. DG-1361, Page 16 b. When replacing previously qualified components, or subcomponents with commercially procured equipment, no significant changes in form, fit, or function