Evaporation treatment method for radioactive waste liquids of nuclear power plant

Active Publication Date: 2014-05-14
CHINA GENERAL NUCLEAR POWER CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Evaporation treatment method for radioactive waste liquids of nuclear power plant
  • Evaporation treatment method for radioactive waste liquids of nuclear power plant
  • Evaporation treatment method for radioactive waste liquids of nuclear power plant

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Embodiment 1

[0059] Embodiment 1. A method for evaporating radioactive waste liquid from a nuclear power plant, preferably comprising the following steps:

[0060] (1) First, collect all kinds of non-reusable radioactive waste liquid formed by the nuclear power plant in the corresponding front waste liquid tank;

[0061] (2) The waste liquid in the front waste liquid tank is transported to the evaporator for evaporation treatment, and the evaporated steam is sent to the condenser to condense to form a distillate, which is left in the evaporator as a concentrated liquid, and the radioactivity of the distillate is detected; In the above step (2), the radioactive detection frequency of the distillate is sampling and detection before each discharge of the distillate.

[0062] (3) Detect that the radioactivity of the distillate is lower than 0.5MBq / m 3 Discharge the distillate; detect that the radioactive activity of the distillate is equal to or higher than 0.5MBq / m 3 , and the concentration...

Embodiment 2

[0066] Embodiment 2. The following is the application of the present invention to the evaporation of waste liquid in Ling Ao Phase I nuclear power plant.

[0067] 1. On November 9, the efficiency of the waste liquid evaporation unit (L9TEU) of the Ling Ao Phase I nuclear power plant was low. During the treatment process using conventional methods, it was found that a large amount of foam was generated when the condenser CS was sampled, so it was suspected that the low efficiency was related to the excessive foam of the waste liquid in the evaporator EV. At the same time, in the investigation of the relevant evaporation activities since 2007 It was found that after adding alkali to the evaporator EV and adjusting the Na / B concentration of the evaporator EV concentrate, the efficiency of the evaporator EV would exceed the internal control standard. The pH value of the liquid is 8.5, which is higher than 6.3 in the Daya Bay Nuclear Power Plant. After testing, it was confirmed tha...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/08
Inventor 梁汉生司鹏昆张朝文姚雪鸿朱建辉
Owner CHINA GENERAL NUCLEAR POWER CORP
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