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

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...

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