A biological shield removal process for swimming pool decommissioning

Abstract

The invention discloses an ex-service biological shield demounting process of swimming pool reactors. The ex-service biological shield demounting process includes steps of (1) adopting different demounting methods according to different weights of concrete; (2) remotely cutting and demounting a lower reactor pool housing and a heat shield by a demounting robot; (3) demounting a pool bottom housing and bottom concrete by the demounting robot with cutters and milling and planing heads. By the disclosed ex-service biological shield demounting process, the biological shield and facility with the same are set as a whole, a diamond jigsaw and the demounting robot are mounted to cooperate in demounting according to weights of the concrete and the structural features of the facility and coordinate with the demounting robot with demounting tools to break and demount and remotely cut and demount and the like. The ex-service biological shield demounting process can guarantee safe demounting of the biological shield, exposure dosage of operators can be reduced, demounted waste can be classified and treated according to the radioactive waste management law, and yield of radioactive waste is reduced.

Description

technical field [0001] The invention relates to the field of dismantling decommissioned nuclear facilities, in particular to a biological shield dismantling process for decommissioning swimming pool piles in the field. Background technique [0002] The following technical difficulties exist in the removal of biological shields: [0003] 1) It is difficult to separate and dismantle the shell and the frame of the shell when removing the pool [0004] The pool is elliptical, and the outside of the pool shell is equipped with a steel frame welded with angle steel. A number of transitional aluminum plates are riveted on the frame, and the transitional aluminum plates are welded together with the aluminum pool shell. Then the frame is poured with different densities of concrete, so that the pool shell and the concrete are closely fitted without gaps, so it is difficult to separate and remove the pool shell from the shell frame. The total activity of the aluminum shell of the poo...

AI Technical Summary

Problems solved by technology

[0005] 2) It is difficult to separate and remove the heat shield

[0007] 3) It is complicated to dismantle the biological shield and the facilities contained in it

[0009] 4) It is difficult to remove the hot chamber

The installation structure of the stainless steel cladding in the hot chamber is complicated. The criss-cross reinforcement bars on the back are welded and fixed with the steel bars of the heavy concrete wall. The anchor hooks are also pre-buried in the heavy concrete wall to connect with the reinforcement ribs, so that the cladding and the heavy concrete are tightly bonded. , there is no gap, and its removal is difficult

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