Failure analysis and improvement measures of DVC electric heaters in CPR1000 reactor type nuclear power plants

According to the design and type selection idea of electric heaters in CPR1000 reactor type nuclear power plants, the design power, design parameters, relative humidity, etc. of DVC electric heater are calculated, analysed, compared and verified, and the main cause of power heater failure during the test of DVC outdoor air purification systems is confirmed. The problem of excessive power of electric heaters is solved by removing the electric heating pipe, which has been applied in the actual nuclear power plant project and achieved good results.