Abstract
A method is presented for controlling the temperature of specimens during capsule irradiation. A narrow gas gap layer is provided in the capsule between the outer and inner cans to serve as thermal resistance barrier. The value of thermal resistance is regulated by varying the vacuum pressure in the gas gap from a control device placed outside the reactor. The present new method has been based on data obtained from preliminary experiments to determine the relation between pressure and thermal resistance in the gas gap, and an original arrangement for controlling the gap pressure from outside the reactor through a long thin tube. Automatic temperature control has been realized through feed-back regulation governing the gap pressure. A discussion is given of theoretical analyses made on the characteristics, the effectiveness and the limits of this temperature control mechanism, backed by experimental data from mock-up and in-pile experiments, demonstrating the practical utility of the method. This new method of temperature control can be expected to find wide application also in other fields.
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