Patent ID: 9570204
Date: 2017-02-14
CPC Classifications: G21C,Y02E

Claim:
1. A completely passive cooling system for a reactor core after an accident of a large-scale pressurized water reactor nuclear power plant, comprising: a shield building having an outer wall and a through air inlet arranged on an upper part of the outer wall; a water tank arranged at an upper part of the shield building; a cooling water distribution plate arranged above a top of a containment within the shield building; a spray pipe arranged at an inside of the top of the shield building and having a water inlet end and a water outlet end, wherein the water inlet end is connected to a bottom of the water tank and the water outlet end is extended to be above the cooling water distribution plate; and an air deflector arranged between the shield building and the containment and having an upper end connected to an inside of the top of the shield building, wherein a smokestack is arranged on a top of the shield building with a steel-concrete composite structure, wherein the water tank is arranged around the smokestack, and wherein the shield building comprises a double-layer steel-concrete composite structure top which is a double layer structure and is formed on an upper end of a cylindrical steel-concrete composite structure, while a cylindrical steel-concrete air flow passage is formed on the double-layer steel-concrete composite structure top, and the double-layer steel-concrete composite structure top forms the water tank; wherein a ratio of a spacing between the air deflector and an inside of the containment to a spacing between the air deflector channel and an outside of the shield building is in the range of 0.15-1:1.