Disassembling technology and dedicated disassembling device of detector assemblies

Abstract

The invention discloses a disassembling technology and a dedicated disassembling device of detector assemblies. The disassembling technology comprises the following steps: moving a big and small vehicle assembly, releasing a gripping apparatus, lifting the gripping apparatus after gripping and disassembling one detector assembly, and clamping and cutting off the detector assembly by a shearing andshrinking assembly; putting the end part of the detector assembly into a low-level waste container; driving the detector assembly to rotate by a winding module in the shearing and shrinking assembly,pulling out the detector assembly from a guiding structure under the action of the shearing and shrinking assembly, coiling the detector assembly after winding into a tubular shape, and descending into a temporary storage container; disassembling other detector assemblies in the same group by repeating the steps; moving the big and small vehicle assembly after completing disassembly, winding thedetector assemblies, and descending into high-level waste containers; continuously disassembling detector assemblies in other groups by repeating the steps; recovering components to original storage places after completing the disassembly of all detector assemblies. According to the disassembling technology disclosed by the invention, a whole pull-out process is reasonably designed, the operatingtime is shortened, and good radiation protection is achieved by utilizing the shield of water in a refueling pool.

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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