COMPLETELY PASSIVE COOLING SYSTEM FOR POST-INCIDENT REACTOR CORE OF LARGE-SCALE PRESSURIZED WATER REACTOR NUCLEAR POWER PLANT

摘要

A completely passive cooling system for a post-incident reactor core of a large-scale pressurized water reactor nuclear power plant, comprising a shielded plant (4), a water tank (5), a cooling water distribution plate (8), a sprinkler water pipe (6), and an air deflector panel (9). A chimney (7) is arranged on the top part of the steel-concrete composite structured shielded plant (4). The water tank (5) is arranged above the shielded plant (4) and around the chimney (7). The cooling water distribution plate (8) is arranged above the top part of a safety housing (3) within the shielded plant (4). The sprinkler water pipe (6) is arranged on the inside of the top part of the shielded plant (4). A water inlet-end of the sprinkler water pipe (6) is connected to the bottom part of the water tank (5). A water outlet-end of the sprinkler water pipe (6) is extended above the cooling water distribution plate (8). A through air inlet (13) is provided on the top part of an outer wall of the shielded plant (4). The air deflector panel (9) is arranged between the shielded plant (4) and the safety housing (3). The upper end of the air deflector panel (9) is connected to the inside of the top part of the shielded plant (4). A double-layered top part is formed on the upper end of the cylindrical shielded plant (4), while a cylindrical air flow passage (16) is formed on the top part, where the double-layered steel-concrete top part constitutes the water tank (5). The cooling system employs the integrated modular design of the shielded plant (4) and the water tank (5), and enlarges the volume of the water tank (5), thus implementing long-term completely passive discharge of reactor core residual heat.