Molten core catcher capable of guiding layered spreading of melts

Abstract

The invention relates to designing technology of reactor safety systems, specifically to a molten core catcher capable of guiding layered spreading of melts. The molten core catcher is arranged in a shaft well vertically connected with the bottom of a reactor pit and comprises multiple layers of melt spreading and detaining chambers, and adjacent melt spreading and detaining chambers for communicated space through a plurality of melt pouring channels. Under a severe accident condition, adequate spreading of the melts is realized through a layered spreading means, so heat of the melts is maximally led out and long-term security of a nuclear power plant after a severe accident is guaranteed.

Description

technical field [0001] The invention relates to the reactor safety system design technology, in particular to a reactor core melt catcher with the function of guiding melt stratification and expansion. Background technique [0002] After the serious 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 accidents. Due to engineering and other requirements. When a serious accident occurs in a pressurized water reactor nuclear power plant, the loss of core waste heat removal means will evaporate and exhaust the coolant, the core will be exposed and continue to heat up, the fuel elements will melt due to the loss of cooling, and the core melt will fall into the pressure vessel ( RPV) lower chamber, which in turn causes the failure of the lower head of the pressure vessel. If effective measures cannot be taken to cool it, the core melt may melt through t...

AI Technical Summary

Problems solved by technology

[0004] All of the core trap related technologies mentioned above do not consider the use of layered expansion to achieve full expansion of the melt, thereby maximizing the heat transfer from the melt

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