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Deposit Minimization Treatment in Secondary Side Steam Generators for Nuclear Plants

Picture for Deposit Minimization Treatment in Secondary Side Steam Generators for Nuclear Plants
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Product Number: 51315-5970-SG
ISBN: 5970 2015 CP
Author: Sarah Evans
Publication Date: 2015
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Recent advances in chemical cleaning solutions for nuclear power plants have reduced the volume of hazardous waste generated and minimized the impact of cleaning on site schedule and operations. Chemical cleanings are most often utilized in secondary side steam generators to reduce the mass of accumulated deposits consisting primarily of iron oxides with trace amounts of other metal oxides for improved thermal performance or mitigation of active corrosion mechanisms as a result of increased deposit loadings. Deposit removal solvents typically consist of a chelating agent combined with other agents such as a strong oxidizer based on the application objectives. Using simple organic acids for deposit dissolution enables the solution be readily decomposed and process to mitigate the final waste streams for disposal.Duke HB Robinson contracted AREVA Inc. (AREVA) to perform a steam generator chemical cleaning using the AREVA Deposit Minimization Treatment (DMT) at the RO-28 Outage Robinson Nuclear Plant Unit 2 (RNP). The DMT process was applied to the three Westinghouse Model 44F replacement steam generators (SGs) in a combination of series and parallel operations. The paper will present the Steam Generator configuration the DMT process application and results from the DMT application and waste disposal.
Recent advances in chemical cleaning solutions for nuclear power plants have reduced the volume of hazardous waste generated and minimized the impact of cleaning on site schedule and operations. Chemical cleanings are most often utilized in secondary side steam generators to reduce the mass of accumulated deposits consisting primarily of iron oxides with trace amounts of other metal oxides for improved thermal performance or mitigation of active corrosion mechanisms as a result of increased deposit loadings. Deposit removal solvents typically consist of a chelating agent combined with other agents such as a strong oxidizer based on the application objectives. Using simple organic acids for deposit dissolution enables the solution be readily decomposed and process to mitigate the final waste streams for disposal.Duke HB Robinson contracted AREVA Inc. (AREVA) to perform a steam generator chemical cleaning using the AREVA Deposit Minimization Treatment (DMT) at the RO-28 Outage Robinson Nuclear Plant Unit 2 (RNP). The DMT process was applied to the three Westinghouse Model 44F replacement steam generators (SGs) in a combination of series and parallel operations. The paper will present the Steam Generator configuration the DMT process application and results from the DMT application and waste disposal.
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