A group retention and cooling system for core melt

Abstract

The invention relates to a reactor core molten debris grouping retention and cooling system which comprises a grouping retention system and a cooling system. The grouping retention system comprises a molten debris retention vessel loading shaft arranged at the bottom of a reactor cavity and multiple molten debris retention vessels arranged in the molten debris retention vessel loading shaft, the molten debris retention vessels are connected with the reactor cavity through multistage molten debris transport channels, molten debris retention vessel transfer devices are arranged on the molten debris retention vessel loading shaft in a penetrating mode, and the molten debris retention vessel transfer devices are connected with the cooling system; the cooling system comprises a molten debris cooling water tank and a cooling circuit of the molten debris cooling water tank. The reactor core molten debris grouping retention and cooling system aims at achieving grouping retention and cooling on reactor core molten debris by means of an independent packaging container on the working condition that serious accidents occur; improvement of molten debris decay heat exporting power is facilitated, and an irradiation dose to a worker is reduced; the structure is compact, and the occupied space is small.

Description

technical field [0001] The invention belongs to an external collection system for reactor core molten matter, in particular to a group retention and cooling system for reactor core molten matter. 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 the pre...

AI Technical Summary

Problems solved by technology

[0004] None of the above patents related to the core catcher considers the use of separate containers to collect and cool the core melt in groups

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