Evaporation treatment method for radioactive waste liquids of nuclear power plant

Abstract

The invention discloses an evaporation treatment method for radioactive waste liquids of a nuclear power plant. The method includes the following steps: firstly, collecting and gathering various waste liquids; secondly, subjecting the waste liquids to evaporation treatment to form distillate and concentrate, and detecting radioactivity of the distillate and the concentrate; thirdly, when radioactivity detection results are lower than radioactive discharge standards, discharging the distillate, when boron concentration in the concentrate is detected to be up to solidification standards, discharging and solidifying the concentrate, and finishing evaporation; if the radioactivity detection results are equal or higher than the radioactive discharge standards and the boron concentration in the concentrate is detected to be less than 10000ppm, adding acid to stepwise regulate pH value of the concentrate to be below 7, and repeating the second and third steps till evaporation is finished. The method is simple in process, convenient to operate, and capable of greatly lowering radioactivity of the distillate to enable the radioactivity to be lower than the discharge standards.

Description

technical field [0001] The invention belongs to the technical field of nuclear power plant radioactive waste treatment and disposal, and relates to a treatment method for radioactive waste liquid, in particular to a nuclear power plant radioactive waste liquid evaporation treatment method. Background technique [0002] During the operation of nuclear power plants, various waste liquids will be produced. The waste liquid often contains radioactive substances. This waste liquid cannot be discharged at will. The source of the waste liquid containing radioactive substances is based on the Daya Bay Nuclear Power Base. [0003] Taking the first phase of Dilingao Nuclear Power Plant as an example, the main sources of waste liquid are shown in Table 1 below: [0004] Table 1 Waste liquid source table [0005] [0006] After filtering and desalting, these waste liquids still do not meet the discharge requirements or the chemicals are unqualified, and need to be evaporated; after ...

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Problems solved by technology

[0009] The technical problem to be solved by the present invention is that, in view of the low efficiency of the radioactive waste liquid evaporator in the prior art, conventional flushing of metal screens, adjustment of evaporation, repeated evaporation, addition of defoamers, evaporator flushing, etc. When the method cannot solve the defect of low efficiency of the evaporator, a method for evaporating the radioactive waste liquid of a nuclear power plant is provided, which is simple in process, convenient in operation, and can greatly reduce the radioactivity of the distillate so that it is lower than the discharge standard.

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