A trial product of capsules and control system for improved contssion neutron irradiation experiments

在裂变反应堆辐照材料期间的温度-中子通量历史的大多数情况下，辐照期间的温度控制是通过核反应产生的伽马射线加热和冷却剂的热传导冷却之间的平衡来实现的。通过这种方法，显然不可能在反应堆启动和关闭期间将样品保持在所需的温度，因为伽马加热不够。本课题为京都大学反应堆研究所某核反应堆水动力管辐照胶囊及控制系统的试验产品，以实现对中子通量-温度历史的改进控制。使用靠近样品的电加热器，胶囊能够将样品加热到573K以上。经过脱档试验等多次试验后，在473K温度下进行改良温控的中子辐照实验，辐照时间为3小时。对Au、Cu、Fe、Cu合金、Ni合金和不锈钢试样进行了电镜观察，得到了缺陷组织的相关数据。

In most cases of the temperature-neutron flux history during the fission reactor irradiation of materials, the control of temperature during irradiation is performed by the balance between heating by gamma-ray from nuclear reactions and cooling by heat conduction to the coolant. By this method, it is obviously impossible to maintain samples at the desired temperature during the start-up and shut-down of a reactor at which the gamma-heating is not sufficient.This research project is to make a trial product of irradiation capsule and control system for the hydrodynamic tube of a nuclear reactor of Kyoto University Research Reactor Institute (KUR) in order to accomplish an improved control of neutron flux-temperature history. The capsule has an ability to heat the specimen in it at above 573K using an electric heater near the specimen. After several test including out of file test, the neutron irradiation experiment with improved temperature control was performed at 473K for 3 hours. The samples were Au, Cu, Fe, Cu alloys, Ni alloys and stainless steels and the defect structures were observed by electron microscopy and several data were acquired.