Abstract
A model explaining the uniform and nodular corrosion and hydriding behaviour in BWRs is presented. As illustration, three materials with different second phase particle (SPP) distributions have been characterised in the un-irradiated and irradiated conditions. One of the materials shows accelerated uniform corrosion at higher burn-ups, despite a similar alloy composition for all three materials. It is concluded that the SPP distribution and chemical composition is controlling the corrosion and hydriding behaviour at all stages, except in the pre-transition stage. It is further concluded that, of several simultaneous corrosion processes, one is normally rate limiting at each stage of corrosion development, but different corrosion processes are rate limiting at each stage.
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