Enforcedly spread type core molten debris catcher

Abstract

The invention belongs to the technical field of safety of a nuclear reactor and in particular relates to an enforcedly spread type core molten debris catcher. The enforcedly spread type core molten debris catcher comprises a molten debris expansion chamber which is connected with a reactor pit of the nuclear reactor through a molten debris transferring channel, and is characterized in that a catcher bottom plate capable of bearing molten debris conveyed by the molten debris transferring channel is arranged on a bottom surface in the molten debris expansion chamber; a catcher cover plate with catcher cover plate exhausting holes is arranged above the catcher bottom plate; the catcher bottom plate and the catcher cover plate are in directional support connection through falling of a plurality of cover plates; the catcher cover plate can cover the catcher bottom plate. An existing molten debris catcher cannot be used for uniformly spreading core molten debris and cannot realize maximization of heat conducting quantity of the molten debris; the core molten debris catcher provided by the invention can be used for uniformly spreading the molten debris and enlarging heat exchange area; the heat leading-out power of decaying of the molten debris is easy to improve and invalidation of a protection screen, caused by partial overheating, is avoided.

Description

technical field [0001] The invention belongs to the technical field of nuclear reactor safety, and in particular relates to a forced-spread core melt catcher. 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 pressure vessel. After the pressure ves...

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Problems solved by technology

[0004] All of the above patents related to the core catcher do not consider the use of forced spreading to achieve full expansion of the melt, thereby maximizing the heat transfer of the melt

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