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Radioactive waste curing method

A technology of radioactive waste and solidification method, which is applied in the fields of radioactive purification and nuclear engineering, which can solve the problems of increased waste volume and disposal costs, and achieve the effects of avoiding the reduction of waste body stability, good physics, and large containment rate

Pending Publication Date: 2016-09-28
CHINA NUCLEAR POWER ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this treatment method itself has a large waste volume reduction rate, the cement fixed waste package produced by this method cannot meet the requirements for near-surface disposal of radioactive waste in my country, and it needs to be packed into high-integrity containers for secondary packaging , thus substantially increasing the volume and disposal costs of the final waste body

Method used

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Embodiment 1

[0054] figure 1 A set of apparatus for carrying out the method of the invention is shown, said apparatus comprising a dryer, a mixer and a waste container. Concrete curing method comprises the following steps:

[0055] 1) The radioactive waste resin is first sent to the drier, and dehydrated through the filter set at the lower part of the drier until the water content is less than the predetermined value.

[0056] 2) After dehydration, the radioactive waste resin is dried at a temperature of 100-250°C.

[0057] Generally, the higher the drying temperature and the longer the drying time, the greater the volume and weight reduction of radioactive waste resin. The volume and weight of radioactive waste resin can usually be reduced to less than half after drying.

[0058] The drying temperature of other radioactive waste can be controlled according to actual needs.

[0059] The gas produced by the drying of radioactive waste resin is mainly water vapor and a part of the active c...

Embodiment 2

[0064] figure 2 A set of apparatus for carrying out the method of the invention is shown, said apparatus comprising a dryer and a waste container.

[0065] The specific solidification method can refer to Example 1, the difference is that the mixing step and the cooling and solidification step are all carried out in a waste container.

[0066] The present invention uses bitumen solidification to treat radioactive waste resin or other wastes. Because the operation temperature of controlling bitumen melting and mixing is low (100-130° C.), the mixture does not contain or contains very little strong oxidants such as sodium nitrate, and is used Good ventilation is maintained during the drying and asphalt curing process, so fire accidents are less likely. Even so, if necessary, a corresponding fire extinguishing system should be set up to prevent fire accidents.

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Abstract

The invention relates to a radioactive waste curing method carried out in a ventilating condition; the method comprises the following steps: waste drying, i.e., drying to-be-processed radioactive waste; asphalt fusing, i.e., heating to fuse the selected asphalt; mixing, i.e., evenly mixing dried radioactive waste with fused asphalt; cooling solidification, i.e., cooling the mixture of dried radioactive waste and fused asphalt for solidification, thus forming an asphalt firming body waste bag. The curing method is simple and easy, high in volume reduction ratio, and the formed asphalt firming body is good in stability, thus satisfying GB 14569.3 <low and medium level radioactivity firming body performance requirement-asphalt firming body> requirements, and the asphalt firming body waste bag can satisfy our country radioactive waste near-surface disposal standard requirements.

Description

technical field [0001] The invention belongs to the technical field of radioactive waste treatment, and in particular relates to a radioactive waste solidification method. Background technique [0002] Radioactive waste resin is one of the main radioactive wastes generated by the operation of nuclear power plants. At present, most of the radioactive waste resin produced by nuclear power plants in my country is treated by traditional cement curing and thermal compaction methods. [0003] The cement solidification process is used to treat radioactive waste resin. Although the solidified body produced can meet the requirements of GB 14569.1 "Performance Requirements for Low and Medium Level Radioactive Solidified Body—Cement Solidified Body", the cement solidification process has the following problems: [0004] a. Due to the limited containment capacity of radioactive waste resin by cement solidification, the volume of waste after treatment is larger, usually 3 times or more t...

Claims

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Application Information

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IPC IPC(8): G21F9/30
CPCG21F9/307
Inventor 严沧生战仕全张瑞蔡挺松
Owner CHINA NUCLEAR POWER ENG CO LTD
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