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Method for online measuring zinc content of coolant in primary circuit of pressurized water reactor

A technology for coolant and zinc content, applied in the field of water chemistry of reactor engineering, can solve the problems of high radiation dose, frequent exposure of operators, and inability to grasp the zinc concentration in real time, so as to reduce radiation dose, high measurement accuracy, and improve accuracy. Effect

Inactive Publication Date: 2015-04-22
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Abstract
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  • Application Information

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Problems solved by technology

However, this method requires pre-sampling and off-line measurement of the zinc content, which makes the operator frequently exposed to the radiation field, and the radiation dose received is relatively large
On the other hand, off-line measurement of zinc concentration cannot grasp its changes in the primary circuit coolant in real time, and cannot meet the requirements of timely adjustment and control of zinc concentration in coolant

Method used

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  • Method for online measuring zinc content of coolant in primary circuit of pressurized water reactor

Examples

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Embodiment 1

[0036] A method for online determination of zinc content in the primary circuit coolant of a pressurized water reactor, the method is to use spectrophotometry to measure the zinc content, the spectrophotometric measurement system used includes a spectrophotometer, a peristaltic pump and a draft tube, the steps include :

[0037] (1) Configure zinc standard solution

[0038] Prepare a mixed standard solution of zinc salt, boric acid, and lithium hydroxide as the zinc standard solution, where the zinc salt is acetic acid with a concentration of 1 μg / L, 5 μg / L, 10 μg / L, 20 μg / L, 50 μg / L and 100 μg / L Zinc, boric acid concentration is 1200mg / L, lithium hydroxide concentration is 2.2mg / L;

[0039] (2) Measuring zinc concentration by spectrophotometry

[0040] ⅰ) Measure the absorbance of zinc standard solution

[0041] ①Use spectrophotometry to measure the absorbance of the zinc standard solution, the flow rate of the standard solution is 5ml / min during the test, and the absorban...

Embodiment 2

[0050]Same as the method and steps of Example 1, the difference is that the concentrations of the developer methylene blue, the buffer sulfuric acid and the developer potassium ferrocyanide are respectively 0.05mmol / L, 1.5mol / L and 0.01mol / L; The zinc salt used in the mixed standard solution is zinc nitrate, and it is cleaned with high-purity water before utilizing spectrophotometry to measure the absorbance of the zinc standard solution; the used boric acid concentration of the mixed standard solution is 800mg / L, and the concentration of lithium hydroxide is 2mg / L.

Embodiment 3

[0052] Identical to the method and steps of Example 1, the difference is that the zinc salt used in the mixed standard solution is zinc chloride, the concentration of boric acid used in the mixed standard solution is 2400 mg / L, and the lithium hydroxide concentration is 3.0 mg / L.

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Abstract

The invention belongs to the technical field of water chemistry of reactor engineering and discloses a method for online measuring zinc content of a coolant in a primary circuit of a pressurized water reactor. The method comprises the following steps: measuring absorbencies of zinc of the coolant before and after adding a color developing agent and a buffer agent by using a spectrophotometric method, thus obtaining a work curve of a difference value between the two absorbencies and zinc concentration, and further obtaining the zinc content of the coolant. The method has the advantages that zinc in the coolant of the primary circuit of the pressurized water reactor can be online measured and the measuring accuracy is high.

Description

technical field [0001] The invention belongs to the technical field of reactor engineering water chemistry, and in particular relates to a method for on-line determination of the zinc content in the primary circuit coolant of a pressurized water reactor. Background technique [0002] Corrosion is one of the biggest hidden dangers threatening the safety and life of nuclear reactors. On the one hand, the corrosion of primary circuit component materials of nuclear reactors threatens the safety of the reactor, on the other hand, the activation and deposition of corrosion products will also cause excessive radiation dose in shutdown. In order to alleviate the stress corrosion of PWR structural materials and reduce the radiation dose of operators during overhaul, the water chemical technology of adding zinc to the primary circuit coolant is usually adopted in the world. This is mainly because zinc can replace some ions in the oxide film of the primary circuit equipment material, ...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 曹林园王辉辛长胜胡勇海正银田珏杨启法
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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