Nuclear power station passive emergency water supply system

The invention discloses a nuclear power station passive emergency water supply system, which is different with a traditional nuclear power station emergency water supply system, and the traditional nuclear power station emergency water supply system is characterized in that emergency water supply is provided by power-driven, steam-driven or a diesel engine pump. The water supply system employs a steam jet pump, steam generated in a reactor steam generator is taken as a driving source, under loss of main feed water and factory electric accident, the passive emergency water supply system takes water from emergency water supply source, then the water passes through the steam jet pump for boosting and then is conveyed to a steam generator, and a loop of sensible heat and decay heat can be outwardly taken through a main steam pipe. the steam jet pump is the supercharging equipment without direct consumption of mechanical energy and without motion parts, compared with traditional machinery supercharging equipment, the supercharging equipment has the advantages of simple and reliable performaces. The system uses passive equipment to take the loop of sensible heat and decay heat, cooling of the loop can be realized, and the system has good feasibility and reliability.