Thermal disturbance intensity limitation in main control rooms of nuclear power plants

The indoor air temperature of main control rooms is controlled by the passive heat sink when there is an accident in passive nuclear power plant. Establishes a model analysis system, and studies the impact of different thermal disturbance intensities on indoor air temperature rise. Simulates and analyses five operation conditions that the thermal disturbance intensity is 1 time, 1.25 times, 1.5 times, 1.75 times and 2 times of the model thermal disturbance intensity. The results show that the temperature rises of the five conditions are 4.16, 5.05, 6.02, 6.96, 7.85 ℃, respectively, during 72 hours in accident. Obtains a binary function of the maximum temperature rise varying with the indoor thermal disturbance intensity and the heat sink capability by fitting, and concludes that corresponding to the temperature rise safety limit of 8.3 ℃, the thermal disturbance intensity should not exceed 2.10 times of the model thermal disturbance intensity.