Abstract

A measurement system has been designed and built for the specific application of measuring thermal conductivity of a composite nuclear fuel over a temperature range of 400 K to 1100 K. Because the composite nature of the sample requires measurement of the whole compact, there is no existing method available for obtaining its thermal conductivity in a non-destructive manner. The designed apparatus is an adaptation of the guarded-comparative-longitudinal heat flow technique. Initial testing has been performed on stainless steel 304. The determinate uncertainty is presented and found to be 2.5% excluding the error associated with the reference samples. The prototype system is expected to be further tested and modified for the measurement of thermal conductivity of fresh fuel compacts at elevated temperatures in a radioactive environment.

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