Replacement and transfer method of radioactive waste filter element in nuclear power plant

Abstract

The invention discloses a replacement transfer method and a device for a nuclear power station radioactive waste nuclear filter core. The replacement transfer device comprises a shielding cabin and three sets of grippers arranged in the shielding cabin. The three sets of grippers all have an automatic grip function, and can cooperate with each other to complete all grip operations in a filter core replacement process. The replacement transfer method makes use of the device to replace and transfer the waste filter core. Compared with the prior art, the replacement transfer method and the device for the nuclear power station radioactive waste nuclear filter core involved in the invention automatically achieve replacement of the waste filter core through the three sets of grippers. In the whole replacement process, the filter is always covered by the shielding cabin, so that no radioactive diffusion can be caused. At the same time of enhancing the automation level, the radiant exposure to the operation stuff and the working area can be reduced.

Description

technical field [0001] The invention belongs to the field of radioactive waste treatment in nuclear power plants. More specifically, the invention relates to a replacement and transfer method and a replacement transfer device for radioactive waste filter cores in nuclear power plants. Background technique [0002] The filter elements used in nuclear power plants will produce radioactive waste filter elements during operation. These waste filter elements often have a high surface dose rate. Once exposed to the environment, they may diffuse or migrate to the environment, causing damage to the environment. pollution of the environment. The filter in use is generally installed in a cavity structure with a shielding effect. When the filter core is not taken out, the radioactive filter core and the radioactive fluid flowing through the filter are shielded by the shielding cavity structure. Its radioactivity will not spread to the outside world; after the filter fails, the radioac...

AI Technical Summary

Problems solved by technology

[0005] Although the existing above-mentioned replacement and transfer methods can meet the replacement requirements of waste filter cores, there are still the following technical defects: 1) the level of automation is not high, and some operations need to be manually operated by operators: the opening of the filter top cover requires the use of operators. Rod tools are manually operated on site; the removal and return of the filter cell shielding plug requires the operator to manually connect and disconnect the crane hook to the shielding plug; the filter element replacement transfer device is used before and after transfer , the operator needs to manually connect and disconnect the crane hook and the filter core replacement and transfer device; 2) The radiation protection design is not rigorous enough, and there is a certain degree of radioactive diffusion, resulting in a large radiation exposure dose to the working area and operators : After the shielding plug on the filter top cover of the filter chamber is removed, the waste filter core with radioactivity will be exposed, which increases the radiation dose rate in the working area; after the shielding plug is removed, the waste filter core is taken out Before, the operator needs to disconnect the shielding plug from the crane hook on site, and connect the crane hook to the filter element replacement and transfer device. These manual operations on site will expose the operator to greater radiation exposure

[0006] In view of this, it is indeed necessary to develop a method for replacing and transferring radioactive waste filter cores in nuclear power plants and a replacement transfer device that can solve the problems of low automation of existing processes and insufficient radiation protection design.

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