Abstract
A practical method to add hydrogen to zirconium alloys is described that works at low temperatures and short times. Fitness-For-Service predictions to support extended service of CANDU pressure tubes requires mechanical testing of tubes removed from service with end-of-life hydrogen concentrations and representative changes in alloy microstructure caused by irradiation. With the current method, (101 ± 5) wt.ppm hydrogen has been added homogeneously to Zircaloy sheets at (201.5 ± 4.4) °C within 22.3 h. These times and temperatures are well below values that would change any effects of irradiation in the alloy. The method has also been demonstrated with a Zr-2.5Nb micro-pressure tube.
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