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Core melt trap with the function of guiding melt layer expansion

A core melt and expansion function technology, applied in the field of reactor safety system design, can solve the problem of full expansion of the melt without considering the means of layered expansion, so as to avoid the failure of protective barriers, reduce risks, and improve long-term safety.

Active Publication Date: 2020-04-03
CHINA NUCLEAR POWER ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Core melt trap with the function of guiding melt layer expansion
  • Core melt trap with the function of guiding melt layer expansion

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Experimental program
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Embodiment Construction

[0020] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0021] Such as figure 1As shown, the present invention provides a core melt trap with the function of guiding melt stratification and expansion, located in the vertical shaft 17 connected to the bottom of the reactor pit 2 through the vertical transport channel 6, in the vertical shaft 17 There are multiple layers of molten material extended retention chambers 11 arranged vertically, the distance between two adjacent layers of molten material extended retention chambers 11 is 10-30 cm, and a plurality of molten material perfusion channels 10 are passed between adjacent molten material extended retention chambers 11 form a connected space. The bottom of the molten material expansion retention chamber is inclined, and the height gradually decreases from the outside to the center, with an inclination angle of 10-20°, which is helpful for the expansion o...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C9/016
CPCG21C9/016Y02E30/30
Inventor 朱晨郭强张丽韩旭元一单马卫民李炜刘卓于明锐林斌
Owner CHINA NUCLEAR POWER ENG CO LTD