Abstract
Abstract Specimen holders with multiple holes are often used in capsules for material irradiation experiments. In reactor, all parts of capsule are heat sources due to gamma-heating. Then, in thermal analysis, such cylinders must be considered as heat generators with multiple holes. To estimate, for instance, the maximum temperature of test pieces inserted in the holes, temperature distribution in the cylinder must be analysed. Then, it was tried to obtain an analytical expression of the temperature distribution in the cylinder. An equation was obtained by solving the steady-state heat conduction equation with practical assumptions. The equation will be useful in design and safety evaluation of capsules for material irradiation experiments.
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