Double-layer crucible reactor core melt capturing device with internal cooling tube

A core melt, double-layer crucible technology, applied in cooling devices, emergency protection devices, reactors, etc., can solve problems such as failure of the lower head of the reactor pressure vessel, damage to the integrity of the containment, melt-through, etc., so as to improve the retention Success rate and cooling efficiency, strong overall cooling efficiency, and the effect of improving heat transfer capacity

Active Publication Date: 2019-11-15
CHINA NUCLEAR POWER ENG CO LTD
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Problems solved by technology

[0003] 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 reactor pressure vessel (RPV) lower chamber, which in turn causes the failure of the lower head of the reactor pressure vessel. If effective measures cannot be taken to cool it, the core melt may melt through the pressure v

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  • Double-layer crucible reactor core melt capturing device with internal cooling tube
  • Double-layer crucible reactor core melt capturing device with internal cooling tube

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[0037] The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings.

[0038] The composition structure of an exemplary double-layer crucible core melt trapping device with internal cooling pipes of the present invention is as follows: figure 1 As shown, it includes reactor pressure vessel 1, high temperature resistant drainage protection layer 2, path 3 for core molten material sprayed out from the pressure vessel after the accident, special concrete 4, inner crucible 5, outer crucible 6, cooling pipe 7, cooling Pipe water inlet 8, support base 9, cooling flow channel 10, stack pit cavity 11, stack pit 12, cooling water injection port 13, sacrificial material stack 14, fusible metal grid plate 15.

[0039] The inner crucible 5 is arranged directly below the reactor pressure vessel 1, and it is fixed in the outer crucible 6 located outside the reactor pressure vessel 1 below the reactor pressure vess...

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Abstract

The invention belongs to the technical field of nuclear safety control and relates to a double-layer crucible reactor core melt capturing device with an internal cooling tube. The capturing device comprises a reactor pressure container, an inner crucible, an outer crucible, a cooling runner, a reactor pit, a reactor pit cavity, cooling tubes and cooling tube water inlets, wherein the inner crucible is arranged right below the reactor pressure container, is fixed outside the reactor pressure container and is positioned inside the outer crucible below the reactor pressure container; the coolingrunner in which cooling water flows is formed between the inner curable and the outer crucible; the outer crucible is mounted in the reactor pit cavity formed in the reactor pit; a plurality of cooling tubes are arranged inside the inner crucible; each cooling tube communicates with the cooling runner through the cooling tube water inlet in the bottom of each cooling tube; small holes are formed in side walls of a part of the cooling tubes; the small holes are externally covered by sacrificial concrete protection layers of 5-30mm in thickness. By adopting the capturing device provided by the invention, the retention success rate and the cooling efficiency of a reactor core capturer upon reactor core melts can be remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of nuclear safety control, and relates to a double-layer crucible core melt collecting device with internal cooling pipes. 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. [0003] 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 reactor pressure vessel (RPV) lower chamber, which in turn causes the failure of the lower head of the reactor pressure vessel. If effective measures cannot be taken to cool it, the core melt may m...

Claims

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Application Information

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IPC IPC(8): G21C9/016G21C13/10G21C15/18
CPCG21C9/016G21C13/10G21C15/18Y02E30/30
Inventor 马卫民元一单郭强李炜张丽朱晨韩旭邢继荆春宁堵树宏
Owner CHINA NUCLEAR POWER ENG CO LTD
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