IngentaConnect In-core corrosion monitoring in the Halden test reactor

Authors: Bennett, P.; Karlsen, T.

Source: Energy Materials: Materials Science and Engineering for Energy Systems, Volume 3, Number 2, June 2008 , pp. 81-90(10)

Publisher: Maney Publishing

Abstract:

The experimental research programme at the Halden Reactor Project includes a wide range of materials testing, both of in-core structural materials and fuel claddings. An important aspect of the tests is the use of online instrumentation situated within the reactor core. The Halden test reactor is cooled and moderated by heavy water, with a normal operating temperature of 230°C. Representative light water reactor conditions are obtained using dedicated water loops, which include comprehensive online water chemistry analysis systems, including dissolved oxygen/hydrogen concentrations and coolant conductivity. Details are given of the techniques currently used to provide online, in-core corrosion monitoring data, and illustrative results are presented. The techniques include crack growth rate determination by means of direct current potential drop measurements, determination of crack initiation and stress relaxation/creep by means of linear voltage differential transformers, and measurements of electrochemical corrosion potential and conductivity. Details are also given of techniques being adapted for in-core use, including electrochemical impedance measurements and electrochemical noise.

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