Miniature full natural circulation pressurized water reactor system based on large coil steam generator

The invention discloses a miniature full natural circulation pressurized water reactor system based on a large coil steam generator. The reactor system comprises a reactor and a containment, and the reactor is arranged in the containment; the containment is arranged in the air; the system further comprises a nitrogen pressure stabilizing system, a main water supply system, a main steam system, a purification and residual heat removal system, a passive reactor core cooling system, a passive residual heat removal system and a passive containment cooling system. According to the invention, a full-natural circulation integrated pressurized water reactor technical route is adopted, a coolant exports reactor core heat in a reactor in a natural circulation manner, and the heat is transferred to a secondary loop working medium by a coil once-through steam generator to generate superheated steam; the superheated steam can push an efficient small steam turbine generator unit to generate electric energy or be directly o