Document: NRC Regulatory Guide
Document ID: c07843ce-fb70-4e28-ba72-7f6eaee2562d
Document Type: regulatory_guide
Title: Qualification of Continuous Duty Safety-Related Motors for Nuclear Power Plants + HISTORY - HISTORY DG-1150 , Proposed Revision 1, published 8/2009 (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0912/ML091200454.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.40
CFR Part: 
CFR Title: 

Content:
e with IEEE Std 334-1971. This statement was included in the RG 1.40 to assure that all equipment required for the motor to perform as intended was included in testing. The following improvements have been identified to address this exception: Sec. 3.3, Components, IEEE Std 334-2006 added the definition of component which includes some items that are considered “auxiliary equipment” such as thermal overload relays, instrument sensors, seals, sight glasses, etc. The intent of providing a specific definition of “components” as related to motors was to include these types of auxiliary equipment. Sec. 4, Qualification Methods, Subsection 4.1, General, states that seals, gaskets and other nonmetallic components that have significant aging mechanisms shall be evaluated. This section further states that wear and aging mechanisms exist for bearings and lubricants and should be addressed during qualification. Sec. 5.3.2, Type Test Model, Para 1, states that the model should be composed of a full size motor or scale model that incorporates essential components used in production equipment such as bearings, seals, lead seals, lubricants and “other essential accessory devices and equipment”. This paragraph goes on to state that if accessories of production motors are different than the test model, then the production motor accessories must also be qualified. Sec. 5.3.4.1, Insulation Thermal Conditioning, states that motor components (e.g. rotor and stator) “and “other age sensitive components” shall be thermally aged to account for degradation…”. The intent of this section is to ensure that other auxiliary equipment be included in the thermal aging program. Sec. 5.3.4.2, Lubricants, Bearings and Seal Components, This section specifically addresses aging of subcomponents not as a part of the insulation system. Sec. 5.8, Motor Lead Cable, Motor lead cable is not normally considered part of the motor or motor insulation system. Specific qualification guidance