Reactor building and nuclear power station

The invention discloses a reactor building and a nuclear power plant, the inner space of a containment vessel of the reactor building is divided into more than six layers along the vertical direction, the bottom surface of the second layer is a reference surface, the first layer comprises a reactor pit, the second layer comprises a main equipment supporting structure and a main equipment compartment, and the main equipment compartment upwards penetrates through the multi-layer space; the height difference between the bottom surface of the third layer and the reference surface is within the range of + 3-+ 7 m, and the main equipment is arranged in the main equipment compartment of the third layer and extends upwards to penetrate through the multi-layer space; the height difference between the bottom surface of the sixth layer and the reference surface is in a range of + 18 to + 22m, the sixth layer comprises an operation platform, the safety water tank is arranged in the third layer space and extends upwards i