PASSIVE PULSE COOLING METHOD AND SYSTEM FOR NUCLEAR POWER PLANT

The application discloses a passive pulse cooling method and system for a nuclear power plant. The method is executed when a total loss of feedwater or a total loss of feedwater due to power loss superposition of the whole plant occurs. The method comprises a steam generator isolation step, a steam generator function separation step, a cooling steam generator pressure relief step, a deaerator first-stage pressurization step, a feedwater pipeline opening step and a deaerator second-stage pressurization step. When the total loss of feedwater or the total loss of feedwater due to power loss superposition of the whole plant occurs, the function of a plurality of steam generators of the nuclear power plant are separated into two parts a power-operated steam generator and a cooling steam generator, the pressure difference between high-pressure steam in the nuclear steam supply system and the cooling steam generator is used as water injection power, high-pressure steam of the steam pipeline and the power-operated steam generator is used for pressurizing the deaerator, an atmospheric relief valve of the cooling steam generator is opened for pressure reduction, and water in the deaerator is injected into the cooling steam generator in a passive mode through the pressure difference, so water injection of the steam generator is achieved.