Combined treatment system and method for boron-containing radioactive waste liquid of nuclear power plant

A radioactive waste liquid and treatment system technology, applied in radioactive purification, nuclear engineering, etc., to achieve the effects of reduced radiation dose, good removal effect, and high operational flexibility

Pending Publication Date: 2017-09-15
江苏金环科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Chinese patent "A Method for Treating Radioactive Wastewater" (201310103374.1) uses a combined process of reverse osmosis and continuous electrostatic desa

Method used

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  • Combined treatment system and method for boron-containing radioactive waste liquid of nuclear power plant

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The waste liquid to be treated enters from the coarse filtration subsystem, and after passing through the filter 1, the particulate radioactive substances are removed.

[0051] Then the waste liquid flows into the membrane separation subsystem, first passes through the ultrafiltration treatment device 2, intercepts colloidal radioactive substances, and the formed concentrated liquid is discharged to the ultrafiltration concentrated liquid tank 3, and the permeate is discharged to the reverse osmosis raw water tank 4. The waste liquid in the reverse osmosis raw water tank enters the first-stage reverse osmosis membrane module 6 through the first booster pump 5, and then the concentrated liquid is discharged to the reverse osmosis concentrated liquid tank 7, and the permeate enters the second stage through the second booster pump 8 Reverse osmosis membrane module 9. The concentrated liquid of the second-stage reverse osmosis membrane module is returned to the reverse osmo...

Embodiment 2

[0054] Example 2: Removal of radioactivity and boron

[0055] For the boron-containing radioactive waste liquid produced by the normal operation of nuclear power plants, the activity concentration is ~10 6 Bq / L, boron concentration ~ 500ppm, according to the process of Example 1, all subsystems are put into operation, and the ion exchange bed is filled with Na-type cation resin.

[0056] After treatment, the radioactivity concentration of the waste liquid can be lower than 100Bq / L, meeting the emission limit requirements of coastal and inland nuclear power plants in GB 6249 (Regulations on Environmental Radiation Protection of Nuclear Power Plants). The concentration of boron in the effluent is less than 100ppm, and can be less than 0.5ppm after being diluted by the water discharged from the cooling tower of the power plant.

Embodiment 3

[0057] Embodiment 3: remove radioactivity

[0058] For some coastal nuclear power plants, the boron recovery system has been installed, and when there is no requirement for the boron concentration discharged into seawater, the reverse osmosis treatment device can be bypassed. The waste liquid treatment process is as follows: filter, ultrafiltration treatment device, first ion exchange bed, second ion exchange bed, third ion exchange bed and crushed resin filter. After the above treatment sequence, the radioactivity concentration of the waste liquid can also be lower than 100Bq / L, meeting the discharge limit requirements of coastal and inland nuclear power plants in GB 6249 (Regulations on Environmental Radiation Protection of Nuclear Power Plants). However, the boron concentration in the waste liquid remains at the original level.

[0059] The main advantage of this treatment is that no boron-containing concentrate will be produced, and no drying / solidification treatment is r...

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Abstract

The invention discloses a combined treatment system and method for boron-containing radioactive waste liquid of a nuclear power plant. The system comprises a coarse filtration subsystem, a membrane separation subsystem and an ion exchange subsystem, wherein the coarse filtration subsystem is separately connected with the membrane separation subsystem and the ion exchange subsystem, the membrane separation subsystem is connected with the ion exchange subsystem, and the coarse filtration subsystem comprises a filtrator; the membrane separation subsystem comprises an ultrafiltration treatment device connected with an outlet of the filtrator and a multistage reverse-osmosis treatment device connected with the ultrafiltration treatment device, a dosing device is arranged between the ultrafiltration treatment device and the multistage reverse-osmosis treatment device, the multistage reverse-osmosis treatment device is connected with an auxiliary adsorption bed, and the auxiliary adsorption bed is connected with the filtrator of the coarse filtration subsystem; and the ion exchange subsystem comprises a plurality of ion exchange beds which are in series. According to the system and the method, radioactive nuclides and boron can be simultaneously removed from waste liquid of a primary circuit of a pressure water reactor, and the system and the method have a good treatment effect on the radioactive nuclides in different presence forms.

Description

technical field [0001] The invention relates to the field of treatment of boron-containing radioactive waste liquid in nuclear power plants, in particular to a system and method for treating primary loop radioactive waste liquid of a pressurized water reactor nuclear power plant. Background technique [0002] In the pressurized water reactor nuclear power plant, the primary circuit uses pressurized light water as the reactor coolant and moderator. During operation, the radionuclides in the fuel element will diffuse into the coolant through the defects of the fuel cladding, causing the coolant to be radioactive. At the same time, with the operation of the reactor, the metal materials in the primary circuit will gradually corrode, and the substances formed by corrosion will flow in the primary circuit with the coolant, and will be activated when passing through the core, and will also be radioactive. On the other hand, boric acid is also used in the primary circuit of the pre...

Claims

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Application Information

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IPC IPC(8): G21F9/12G21F9/04
CPCG21F9/04G21F9/12
Inventor 张鏖顾万建蒋超吴晔王玉萍
Owner 江苏金环科技有限公司
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