A methodology for hardness measurement on calandria interior surface of CANDU reactors is developed. This is utilized as a tool for an assessment of neutron irradiation embrittlement effect on the calandria. The best representative measurement points ...
A methodology for hardness measurement on calandria interior surface of CANDU reactors is developed. This is utilized as a tool for an assessment of neutron irradiation embrittlement effect on the calandria. The best representative measurement points and the most applicable hardness test methods are determined in this study, considering not only operating environments such as neutron flux, pressure and temperature but also a continuous operability of the calandria. These results are applicable to a typical CANDU calandria during the period of a replacement of pressure tubes. Though there inevitably remain some permanent marks on the calandria-tubesheet as a result of indentation for hardness measurement, it has not any negative effects on the integrity of the calandria during the continuous operations. This methodology is useful for assuring the suitability of long term operation of CANDU reactors.