Passive emergency cooling system for severe accident in reactor

Abstract

The present invention relates to a passive emergency cooling system for a severe accident in a reactor. The purpose of the present invention is to solve the reactor cooling problem after the failure of the cooling system by the disaster and the severe accident. According to the system, a high position pool, a heavy pollution pool, a moderate pollution pool and a light pollution pool are arranged outside the reactor; a first branch of a high position pool water supply pipe is connected with a reactor core pressure container by a shuttle type check valve; a second branch is connected with a safety housing by a shuttle type check valve; a third branch is connected with a spraying device on an outer room ventilation hole by a shuttle type check valve; a first water outlet pipe on the safety housing is connected with a repeat pollution pool by a shuttle type check valve; a second water outlet pipe on the safety housing is connected with the moderate pollution pool by a shuttle type check valve; a third water outlet pipe of the outer room is connected with the light pollution pool by a shuttle type check valve; all the position pools are provided with cover plates; each position pool is provided with a boosting pump, wherein the polluted water is pumped from the pools by water aspirators, and reflows to the high position pool after passing through the shuttle type check valves and pollution water treatment devices.

Description

Technical field: [0001] The present invention relates to nuclear power plant core cooling, depressurization waste heat removal system, especially related to the passive emergency hydraulic cooling system in which the power source is destroyed due to earthquake and tsunami, and the above system cannot work. Background technique: [0002] The existing reactor injects water into the core pressure vessel through the water cooling system of the external power source to cool the cooling water. The cooling system is composed of a water injection pump, an electric drive valve and a pipeline. Inject water. The cooling water drainage system of the core and containment is also composed of drainage pump electric drive valves and pipelines. The existing cooling system has the following disadvantages: [0003] 1) Peripheral power sources fail under the influence of natural disasters and serious accidents beyond the design basis, safety-level diesel generators and other power sources are...

AI Technical Summary

Problems solved by technology

[0003] 1) Peripheral power sources fail under the influence of natural disasters and serious accidents beyond the design basis, safety-level diesel generators and other power sources are destroyed, and the core pressure vessel and containment cooling system also fail;

[0004] 2) A large number of electronically controlled and driven equipment, instruments, valves, etc. fail in the event of natural disasters and serious accidents exceeding the design criteria, high temperature, high pressure, high humidity, and power failure. The core pressure vessel, safety The shell cooling system also fails

[0009] Affected by natural disasters and serious accidents that exceed the design criteria, the only few DC control and drive components in the circuit fail under high temperature, high pressure, and high humidity conditions, becoming the bottleneck of the step-down, injection, and circulation systems; Formal water injection tanks are difficult to achieve long-term cooling without water replenishment

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