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Purification method and apparatus for nuclear power spent fuel pool water and treatment method and apparatus for spent fuel pool water

A purification device and spent fuel pool technology, applied in water/sewage treatment, water/sludge/sewage treatment, ion exchange water/sewage treatment, etc., can solve problems such as uselessness, reduce load, reduce production, The effect of prolonging life

Inactive Publication Date: 2015-04-29
EBARA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the methods proposed so far relate to the purification of low-concentration water such as nuclear reactor cooling water and radioactive waste liquid, where the concentration of oxidation-promoting substances is about 0.01 to 0.001 mg / L, and have not been used for water containing more than 1 mg / L Example of purification of spent fuel pool water containing high concentration of oxidation-promoting substances and boric acid (for example, about 2,000 to 3,000 mg / L)

Method used

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  • Purification method and apparatus for nuclear power spent fuel pool water and treatment method and apparatus for spent fuel pool water
  • Purification method and apparatus for nuclear power spent fuel pool water and treatment method and apparatus for spent fuel pool water
  • Purification method and apparatus for nuclear power spent fuel pool water and treatment method and apparatus for spent fuel pool water

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Experimental program
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Effect test

Embodiment 1

[0037] Use a metal-supported resin, and confirm the hydrogen peroxide decomposition ability by dipping test.

[0038]First, as the metal-supported resin, Pd-supported resin Lewatit (registered trademark) K7333 of LANXESS was used. In the 200ml beaker, add 100ml that has dissolved 20mg / L hydrogen peroxide water and dissolved boric acid so that its concentration is the treated liquid (sample 1) of 2800mg / L (in terms of B concentration), drop into 1ml Pd load resin, measure the time-lapse concentration of hydrogen peroxide. It should be noted that the hydrogen peroxide concentration and the boron concentration are numerical values ​​simulating the water quality of fuel pool water in a pressurized water type (PWR) nuclear power plant. As a reference, the same test was carried out using a liquid to be treated (sample 2) to which no boric acid was added, that is, water to which only hydrogen peroxide was added. The concentration of hydrogen peroxide was calculated by measuring the...

Embodiment 2

[0043] The decomposing ability of hydrogen peroxide was confirmed by a water-through-column test using a metal-supported resin.

[0044] First, a glass column having an inner diameter of 16 mm was filled with a layer height of 1 to 10 cm using Pd-supporting resin Lewatit (registered trademark) K7333 from LANXESS as the metal-supporting resin. Hydrogen peroxide water adjusted to about 2 mg / L was passed through at a linear velocity LV of 10 to 70 m / h to study the hydrogen peroxide removal performance of the metal-supported resin. The results are shown in Table 2 and image 3 .

[0045] [Table 2]

[0046]

[0047] Depend on image 3 It can be seen that more than 90% of hydrogen peroxide can be decomposed if the layer height is 2 cm or more and the water flow LV is 50 m / h or less.

Embodiment 3

[0049] The influence on the degradation of the ion exchange resin by hydrogen peroxide was confirmed.

[0050] The cationic resin was immersed in solutions of various hydrogen peroxide concentrations for 24 hours, and the total organic carbon (TOC) concentration was measured with TOC-V manufactured by Shimadzu Corporation. Such as Figure 4 As shown, it was confirmed that if the concentration of hydrogen peroxide is less than 1 ppm, there is little influence on resin deterioration. Therefore, it is considered that it is sufficient to decompose 90% or more of the hydrogen peroxide present in the fuel pool at the level of several ppm.

[0051] Generally, if the TOC concentration exceeds 20 ppm, ion exchange resin replacement is performed. Depend on Figure 4 It can be seen that when the hydrogen peroxide concentration exceeds about 3.5 ppm, the TOC concentration exceeds 20 ppm, and the ion exchange resin must be replaced. Depend on figure 2 and Figure 4 It can be seen th...

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Abstract

A purification method for spent fuel pool water from nuclear power generation, the method comprising: passing the water at a linear flow velocity of 50 m / h or less through a purification apparatus for the water comprising an ion exchange resin layer and a metal-doped resin layer which is laid at a bed height of 2 cm or more on a surface layer of the ion exchange resin layer wherein the water to be treated is contacted with the metal-doped resin layer to decompose a pro-oxidant contained in the water; and subsequently contacting the water with the ion exchange resin.

Description

technical field [0001] The present invention relates to a treatment method and device for spent fuel pool water generated in a nuclear power plant, in particular to a purification method and device for decomposing and removing oxidation-promoting substances such as hydrogen peroxide contained in spent fuel pool water, and a spent fuel pool combined with the purification method and device. Fuel pool water treatment method and device. Background technique [0002] In order to purify spent fuel pool water generated in nuclear power plants and recycle it as cooling water for spent fuel rods, a desalination device using granular ion exchange resin can be used as a fuel pool water purification device. The purpose of installing this desalination device is to suppress corrosion of spent fuel and various materials in storage, and to reduce radiation doses to operators by removing radioactive substances in pool water, thereby maintaining soundness for a long time. [0003] In the des...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/22
CPCB01J47/028C02F1/42C02F1/705G21F9/008G21F9/22C02F2101/10C02F2101/006B01J47/04G21F9/12B01J47/026B01J41/05Y02E30/30C02F2001/422C02F2001/425C02F2001/427C02F2103/023C02F2103/04G21C19/307
Inventor 出水丈志小松诚
Owner EBARA CORP
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