Irradiation-Induced Embrittlement of Inconel 600 Flux Detectors in CANDU Reactors  

作　　者：Malcolm Griffiths Grant Bickel Stephen Douglas 

机构地区：[1]Deformation Technology Branch, Atomic Energy of Canada Ltd., Ontario KOJ 1JO, Canada

出　　处：《Journal of Energy and Power Engineering》2012年第2期188-194,共7页能源与动力工程（美国大卫英文）

摘　　要：Post-irradiation examination of encapsulated INCONEL 600 coiled flux detectors that had failed after several years of service in a CANDU reactor showed that many of the detector wires inside the carrier rod were broken. It was concluded that failure occurred because the He cover gas was lost and replaced by air. Because He is a better thermal conductor than air, and because nuclear heating is significant, the temperature of the assembly increased. The examination showed that those parts of the INCONEL 600 detector wires that had operated at the highest temperature were the most severely embrittled. Parts of the same detector wires that were operating at lower temperatures remained ductile. The temperature dependence for the embrittlement of INCONEL 600 material can be explained in terms of the transition from recombination-dominated to sink-dominated reaction-rate kinetics for point defect accumulation at sinks. Cavity formation and accumulation at grain boundaries could weaken the material and result in the observed brittle intergranular failure.

关 键 词：EMBRITTLEMENT neutrons FLUX detectors He temperature. 

分 类 号：TM623.92[电气工程—电力系统及自动化] TG146.15[一般工业技术—材料科学与工程]