Emergency core cooling system for nuclear power plant

Abstract

The invention discloses an emergency core cooling system for a nuclear power plant. The system specifically comprises a high-pressure safety injection pump, a low-pressure safety injection pump, a safety water injection tank, an automatic pressure relief system, a pressure stabilizer, a direct injection pipeline, a waste heat removal heat exchanger, a pressure container and a containment pressuresuppression pool, wherein the automatic pressure relief system, the containment pressure suppression pool, the pressure stabilizer, the pressure container and the direct injection pipeline are arranged in a containment, and the high-pressure safety injection pump, the low-pressure safety injection pump, the safety water injection tank and the waste heat removal heat exchanger are arranged outsidethe containment. Compared with the prior art, the system provided by the system combines the low-pressure safety injection function and the waste heat removal function, so that system configuration issimplified, and economical efficiency is improved. The pressure suppression pool is arranged in the containment, and a containment pit is removed, so that the volume of the containment and the configuration of a recirculation filter are greatly reduced. The safety water injection tank is arranged out of the containment, the problems that the containment penetration pieces is increased, and pipeline arrangement is complex and the like caused by the arrangement of a refuelling water tank in the containment are eliminated.

Description

technical field [0001] The invention relates to the technical field of nuclear power plant equipment, in particular to an emergency core cooling system of a nuclear power plant. Background technique [0002] The safety injection system is also called the emergency core cooling system, which is mainly used to ensure the emergency safety shutdown of the reactor and discharge the residual heat of the core for a long time under various hypothetical accident conditions. At present, most large pressurized water reactor nuclear power plants are equipped with a safety injection system to perform emergency core cooling under accident conditions and maintain the water loading of the primary circuit. In order to achieve the above functions, the safety injection system must be injected at different pressure levels according to the pressure drop of the primary circuit system during the accident. [0003] The security injection system in the prior art consists of three subsystems: [00...

AI Technical Summary

Problems solved by technology

The safety injection system disclosed in this Chinese patent has the following problems: 1) Its high-pressure safety injection and low-pressure safety injection adopt parent control injection, that is, if figure 1 As shown, the injection pipelines at the outlet of the safety injection pumps are connected to each other, and each pump can inject to any injection point, and the number of injection pipelines increases. Secondly, the refueling water tank is set in the containment, from figure 1 It can be seen that the connection between the system and the refueling water tank 207 needs to penetrate the containment vessel, and each pipeline penetrating the containment vessel must be provided with a containment vessel penetration piece, resulting in an increase in the number of containment vessel penetration pieces; 2) The system configuration is complex. The system uses main pipe injection, which leads to an increase in the number of injection pipelines and corresponding equipment, and at the same time leads to uneven flow distribution at each injection point. For this reason, each injection pipeline needs to be set with a flow regulating valve for regular adjustment; 3) There are certain penetrations. Leakage risk, the increase in the number will directly lead to an increase in the failure risk of the containment as the third barrier, and the system security needs to be improved

[0008] To sum up, the security injection system in the prior art has problems such as complex configuration, single function and poor economy

Images