In-Reactor Studies of Radiation Effects on materials in Research Reactors

摘要

In-reactor nd real-time measurements of changes of material porperties are arousing strong concerns in variety fo engineering and scientific field. Examples are: 1) applications of functional ocmponents and systems in radiation environments, such as post irradiation examinations, radioactive waste manaement, decommissioning, and space missions, 2) developments of nuclear fusion reactors, 3) advanced dosimetry fo nuclear fission reactors, 4) understanding of fundamental porcesses of radiation effects in materials. To carry out in-situ studies, sophisticated radiation techniques, detailed on-line measurements, flexible opertioin mode of a reactor, etc., are needed, which will be difficult to realize in arge and hihg flux reactors. Dynamic changes of material property have been studied in Japan Materials Testing reactor in a decade and various interesting results were obtained. Examples are change of electricla conductivity of ceramic insulators, changes of optical properties in optical ceramics. THe paper describes examples of structures of developed irradiation capsules for the in-situ studies and some experimental results concerming dynamic radiatin effects whihc will enlighten understanding radiatio effects in materials and whihc also reveal new possibility of developing radiation-resistant functional materials for application in the fields mentioned above.