Load Test of Motor Equipment Qualification and Associated Test Apparatus

Equipment qualification(EQ) of Class 1E motor used in nuclear power plant is performed in compliance with such standards as IEEE Std 323, 334 and 112. IEEE Std 323 is the general standard of EQ, IEEE Std 334 the specific qualification standard about motor, and IEEE Std 112 the standard for motor functional test. All these standards describe the general test contents and sequence for EQ but do not include the details for test execution method, test device specifications and performance criteria. Functional test of motor EQ consists of insulation resistance test, winding resistance test, no-load test and load test. Considering that these tests should be performed in the test chamber during LOCA(Loss of Coolant Accident) test, the load test is the most difficult test due to loading the motor by a mechanical or pneumatic loading device. In this study, we have developed two types of test apparatuses for the load test of Class 1E motor and performed the load test with a couple of motors. We have confirmed the suitable applicability of the developed apparatuses for EQ functional test and performance characteristics of those test specimens