A detector assembly dismantling process and its special dismantling equipment

Abstract

The invention discloses a detector component dismantling process and its special dismantling equipment. The large and small car components are moved and the gripper is lowered, and the gripper is lifted after the detector component is removed. The component is cut off; the end of the detector component is put into the low-level waste container; the winding module inside the shearing and shrinking component drives the detector component to rotate, and the detector component is pulled out from the guide structure under the action of the shearing and shrinking component, and wound The final detector assembly forms a cylindrical reel and falls into the temporary storage container; repeat the above action to remove other detector assemblies in the same group; move the large and small car assemblies after dismantling, roll the detector assembly and drop it into the high release container; repeat The above actions continue to remove other groups of detector components; after all the detector components are removed, restore the components to their original storage positions. The technology design of the whole extraction process of the invention is reasonable, the operation time is shortened, and the shielding of the water in the refueling pool is used to achieve good radiation protection.

Description

technical field [0001] The invention relates to a dismantling technology of a detector assembly introduced from the top cover of a pressure vessel during the non-full life of a nuclear power plant, in particular to a detector assembly dismantling process and special dismantling equipment. Background technique [0002] The instruments used in the core measurement system in the second-generation and second-generation pressurized water reactor nuclear power plants are divided into instrument thermocouples for temperature measurement and neutron flux detectors for flux measurement. The thermocouple is introduced from the top cover of the pressure vessel, guided by the thermocouple column assembly, and positioned at the specified measuring point position, and the lower end of the thermocouple is located at the core outlet of the upper core plate. The flux detector is introduced from the bottom head of the pressure vessel, guided through the instrument sleeve and finger sleeve whe...

AI Technical Summary

Problems solved by technology

However, in the existing technology, when the entire detector assembly is pulled out from the upper reactor internals, due to the high radioactivity at the lower end of the detector assembly, the environmental dose during the extraction process exceeds the standard, resulting in the problem that personnel are exposed to a large amount of radiation.

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