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The LOCA qualification test simulates the thermal and chemical environment within the containment under a Loss of Accident (LOCA) accident to verify that the nuclear-level equipment installed in the installation can complete its intended safety functions during and after an accident. The waste heat removal pump K1 motor is used as a safety grade electrical equipment for nuclear power plants. After the completion of research and development, it must pass the LOCA qualification test to prove that it meets the operating conditions of the nuclear power plant during operation, and supplies it to the nuclear power plant.
The difficulties in this experiment are the realization of rapid thermal shock and the full power operation of the motor under steam and water high temperature conditions. The first thermal shock from 50oC to 156oC was achieved within 13 seconds, and the second thermal shock from 50oC to 164oC was achieved within 18 seconds to meet the thermal shock requirements within 30 seconds of the test protocol. The spraying started from the 200th second, the motor started smoothly 4 hours after the second thermal shock, and maintained at full power for 195 hours. During the entire test process, the test device operated smoothly, and the test parameters fully met the requirements of the test program.
In order to ensure the smooth running of this experiment, since May 2013, the equipment development center of China Kehua Nuclear Power Institute and the technicians of Jiamusi Electric Co., Ltd. have cooperated closely and used spare prototypes for multiple debugging, successfully solving the test equipment. The vibration of the motor and the drive shaft exceeded the standards, and prepared a corresponding solution to the situation that may occur during the test. The formal test started at 11:30 on October 29 and lasted 20 days. During the period, the research personnel of the institute implemented two 24-hour non-stop tracking and monitoring to ensure the successful completion of the trial.
The full-size full-power LOCA test for large motors is the most demanding and final test for the K1-grade nuclear grade equipment, and it is extremely difficult. The completion of this test can announce the successful development of nuclear-grade equipment. At present, only a large-scale LOCA furnace with a volume of 17.8 cubic meters that is owned by the US WYLE laboratory can conduct complete machine tests, but it cannot carry the test. The large-scale LOCA appraisal test device used in this test was invested and built by China National Nuclear Power Group and the National Energy Administration, and passed the acceptance by the National Energy Administration on August 29, 2009. The test device not only possessed the world's largest LOCA furnace at the time, but also was the only facility in the world capable of conducting a large-scale K1 motor-borne LOCA test.
China Guangdong Nuclear Power Co., Ltd. disclosed the waste heat pump motor load test for the first time
Recently, under the testimonies of the National Nuclear Safety Administration and the Ministry of Environmental Protection and other experts, large-scale waste heat removal pump K1 motor full-size loaded LOCA (Cold Loss Accident) test was completed at the Daya Bay Nuclear Power Base. The trial lasted 20 days and was completed by China Nuclear Power Nuclear Technology Institute under the support of Daya Bay Operations Management Corporation. This is the first time that the internationally disclosed full-scale waste heat pump motor is loaded with a load test, which is of great significance for the identification of nuclear equipment and the localization of large K1 motors.