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Selection and application of corrosion protective material for inside weak alkaline demineralized water storage tank of conventional island in the first stage engineering of Hongyan river nuclear power station
Pages: 421-424
Year: Issue:  10
Journal: Electroplating & Finishing

Keyword:  nuclear power stationalkaline demineralized water storage tankpure polyureaturtle oilcorrosion protection;
Abstract: The carbon steel used inside the weakly alkaline demineralized water storage tank (SER) for the conventional island of CPR1000 unit is usually coated with imported“turtle oil” (a product of MAX PERLèS ET CIE) for corrosion protection, whose construction is limited by environment temperature, i.e. 8-30 °C for the primer and 10-30 °C for the topcoat. The corrosion protective construction inside the SER of the first stage of Hongyan River nuclear power station was in winter, and the environment temperature was commonly lower than 10 °C. Therefore, another suitable corrosion protective material must be selected. Taking the experience of corrosion protection inside demineralized water storage tank in thermal power plant as a reference, the matters dissolved from an anticorrosive pure polyurea coating in high-purity water were analyzed. The results indicated that no heavy metal ions but less than 0.5μg/L Na+, F-and Cl-, and less than 2μg/L 24SO -were found in the solution after testing for 15 d, meeting the corrosion protection requirement of SER. The investment for coating three storage tanks with pure polyurea saved 1 200 000 RMB as compared with using the“turtle oil”. The commercial operation for more than half a year showed that the water quality of effluent from the SER coated with pure polyurea met the requirements of nuclear island and conventional island equipments.
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