Pressure container cooling system based on vacuum chamber

Abstract

The invention discloses a pressure container cooling system based on a vacuum chamber. The pressure container cooling system comprises an outer stainless steel drum, a shielding layer and a steel safety shell, wherein the outer stainless steel drum is arranged at the outer periphery of a pressure container; a vacuum chamber is formed between the outer stainless steel drum and the pressure container; the shielding layer is arranged at the outer periphery of the outer stainless steel drum; a water inlet pipe and a water outlet pipe respectively penetrate through the shielding layer and then communicate with the vacuum chamber; a cooling water source is arranged at the outer periphery of the steel safety shell and communicates with the inner side of the steel safety shell through a pipeline;the outer stainless steel drum and the shielding layer are fixedly arranged in the steel safety shell; the pipeline, the water inlet pipe and the water outlet pipe are respectively provided with an electromagnetic valve; and each electromagnetic valve is opened by a control module. The pressure container cooling system provided by the invention can guarantee the heat-preserving effect of the pressure container under the normal operation conditions of a reactor, realizes external cooling of the wall surface of the pressure container after serious accidents, and avoids the failure of the pressure container and the release of large quantities of radioactive products; and since the manner of circulating cooling is adopted, energy is saved and high utilization rate is realized.

Description

technical field [0001] The invention relates to the technical field of small reactors, in particular to a pressure vessel cooling system based on a vacuum chamber. Background technique [0002] After a serious reactor accident, high-temperature molten material falls into the lower chamber, which generates a huge thermal load on the lower head, which may lead to failure of the lower head and release a large amount of radioactive products. In order to prevent the release of radioactive products, the external cooling technology of the pressure vessel is currently used. By cooling the lower head of the pressure vessel, the retention of the molten material in the pile is realized, and an important method for actually eliminating a large amount of radioactive release. [0003] The external cooling technology of the pressure vessel has been applied in advanced land-based pressurized water reactor power stations such as AP1000 and Hualong One, and has been widely recognized. In the...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is the poor cooling effect of the existing vacuum chamber-based pressure vessel cooling system

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