Radioactive waste liquid storage tank bottom mud withdrawing method and system

Abstract

The invention discloses a radioactive waste liquid storage tank bottom mud withdrawing method which comprises the steps that S1, the interior of a storage tank is divided into a plurality of areas tobe recycled; S2, high-pressure water is adopted for carrying out local jet stirring on the bottom mud in any area to be taken back in the storage tank, so that suspension liquid containing the bottommud is formed in the storage tank; S3, the suspension liquid is pumped out of the storage tank; and S4, the steps S2 to S3 are repeated until all bottom mud in the storage tank is withdrawn. The invention further discloses a bottom mud recycling system. The method and system can adapt to different bottom mud environments, the bottom of the storage tank cannot be damaged, recycling operation is convenient, and the withdrawing effect is good.

Description

technical field [0001] The invention belongs to the technical field of radioactive material processing, and in particular relates to a method and system for retrieving bottom sludge of a radioactive waste liquid storage tank. Background technique [0002] For the recovery of the bottom mud (ie bottom mud) left in the large-scale radioactive waste liquid storage tank, it is mainly realized by mechanical stirring at present. Due to the large volume of the storage tank, the small opening of the filling roof, the fluidity of the waste liquid, the high radiation level, and the residual mud at the bottom of the tank, the thickness can reach 20-50cm, and there are two layers of mud with different degrees of hardness, that is, the upper bottom mud is soft and viscous , The lower bottom mud is hardened, and because the tank bottom structure of the storage tank is usually equipped with reinforcing ribs with a height of about 10cm, using the current retrieval equipment to stir all the ...

AI Technical Summary

Problems solved by technology

Due to the large volume of the storage tank, the small opening of the filling roof, the fluidity of the waste liquid, the high radiation level, and the residual mud at the bottom of the tank, the thickness can reach 20-50cm, and there are two layers of mud with different degrees of hardness, that is, the upper bottom mud is soft and viscous , The lower bottom mud is hardened, and because the tank bottom structure of the storage tank is usually equipped with reinforcing ribs with a height of about 10cm, using the current retrieval equipment to stir all the bottom mud in the storage tank through mechanical stirring will easily cause damage to the tank bottom structure , and it is difficult to work in the above-mentioned complex sediment environment, which makes it very difficult to retrieve the sediment, and the retrieval effect is not good, and the residual thickness of the sediment is > 10cm

[0003] Domestically, the recovery of bottom sludge from large-scale radioactive waste storage tanks is still in the early stage of research, and there is no successful engineering experience to learn from; abroad, although the United States, Britain, Russia and other countries have done a lot of research work in this area, A lot of experience has been accumulated. However, due to the large differences in the structure, storage items and sediment characteristics of domestic and foreign large-scale radioactive waste liquid storage tanks, some foreign sediment recovery experience is not very suitable for domestic conditions.

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