Auxiliary cooling system for reaction core of passive reactor

Abstract

The invention belongs to the technical field of nuclear safety control and relates to an auxiliary cooling system for a reaction core of a passive reactor. The auxiliary cooling system for the reaction core of the passive reactor comprises a pressure container, a heat insulation layer, an annular space, a built-in material changing water tank, a water feeding pump, a steam turbine, a water feedingpipeline and a water discharging pipeline, wherein the sealed annular space is formed between an outer wall of the pressure container and the heat insulation layer at the periphery of the pressure container; the built-in material changing water tank is used for supplying water to the water feeding pump through the water feeding pipeline; the water feeding pump is driven by the steam turbine to inject cooling water into the annular space through the water discharging pipeline. By adopting the auxiliary cooling system for the reaction core of the passive reactor, provided by the invention, theimmersion of a reactor cavity of the reactor can be accelerated through a passive means and the critical heat flux density of an in-reactor melt retention device is improved, so that a phenomenon thata wall surface of the pressure container has a boiling crisis is avoided and an IVR system is effective.

Description

technical field [0001] The invention belongs to the technical field of nuclear safety control, and relates to an auxiliary cooling system for a passive reactor core. Background technique [0002] After the serious nuclear accidents at the Three Mile Island and Chernobyl nuclear power plants, the nuclear power industry began to focus on research and research on the prevention and mitigation of severe nuclear accidents. and improve human factors engineering requirements. In order to avoid the large-scale release of radioactive substances caused by the reactor core, related designs of core traps have gradually emerged. Under the background that the independent design of my country's third-generation nuclear power system has achieved phased results, nuclear power plants such as ACP1000, CAP1400, and ACPR1000 Plants have adopted the in-core melt retention device (IVR). [0003] There are many technical solutions disclosed about the core catcher, such as US4442065 (Retrofittable ...

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Problems solved by technology

[0004] However, in the above scheme, the flow rate of the passive cooling water is small, and the heat flux density at the boundary of the wall of the reactor melt retention device is low

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