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294d

Role of Water Treatment in Corrosion Control of Iter Cooling Water System

Frances M. Cutler, Consultant, 6778 Fiji Circle, Boynton Beach, FL 33437 and Andrei Y. Petrov, Oak Ridge National Laboratory, PO BOX 2008 MS6483, Oak Ridge, TN 37831-6483.

ITER is an experimental Tokamak fusion reactor that has been developed in collaboration with seven international partners, including the United States. The ITER cooling water system (CWS) is an integral part of the Tokamak reactor complex and is designed to perform the following key functions:

- Remove heat from in-vessel components during the fusion process;

- Control the fluid thermodynamic parameters;

- Maintain water chemistry within acceptable limits.

To perform these functions safely and reliably, the CWS requires an adequate supply of high-quality demineralized and deaerated water since corrosion mechanisms are frequently related to water purity. It should also be noted that the chemistry environment is an important factor in certain fatigue failure mechanisms. Unsatisfactory water chemistry can also lead to deposition of solids that could permit under deposit corrosion and increase the level of activated corrosion products formed. This paper discusses the influence of makeup water purity on cooling water chemistry and the criteria for makeup water specifications. Design features of the initial water treatment facility, alternative methods for supplying makeup water, and problems and issues of concern relative to the makeup water treatment system are summarized.