Hydrogen Embrittlement of Nuclear Power Plant Materials

抄録

This paper describes the behavior of hydrogen in iron chromium nickel alloys. The behavior of hydrogen was investigated by radioisotope of the hydrogen. The traces of hydrogen in the iron chromium nickel alloys were investigated by measuring the β-ray radiated from tritium. The β-ray can be identified by an auto radiograph method (ARG) and radiation detector. When the ARG method was used, the tritium was charged to the specimen of iron chromium nickel alloys. An emulsion was coated onto specimen of the iron chromium nickel alloys, which charged the tritium, and then the emulsion was exposed to β-ray emitted from tritium captured by iron chromium nickel alloys. The trace of the β-ray appeared as a black image on the emulsion film. It was noted that there were two different black images on the emulsion film. One was an Ag cluster, generated by the β-ray, and the other was stain generated at the development of emulsion. These images were investigated by energy dispersive X-ray spectroscope (EDX) and high-resolution electron microscope (HREM). Using these techniques, captured tritium quantity in the iron chromium nickl alloys was estimated by the analyzed data of EDX and dose of radiation of β-ray.