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ISSN Online: 2377-424X

ISBN Print: 0-89116-130-9

International Heat Transfer Conference 6
August, 7-11, 1978, Toronto, Canada

A METHOD FOR MEASURING THERMAL CONDUCTIVITY OF U02 AT HIGH TEMPERATURES UNDER SIMULATED IN-REACTOR CONDITIONS

Get access (open in a dialog) DOI: 10.1615/IHTC6.3370
pages 1-4

摘要

In-reactor thermal conditions of a UO2 fuel pin can be simulated by passing an electric current through the fuel material (direct electrical heating) while cooling the surface of the pin. By measuring the surface temperature and the applied voltage (with electrical conductivity assumed known as a function of temperature), it is possible to predict the radial temperature profile of the electrically heated fuel pin. With this profile, the total current can be calculated and compared to the measured current. A computer code has been developed to solve the energy equation using an assumed model for thermal conductivity and to match predicted currents with measured currents for a series of power densities and a corresponding series of temperature profiles. The code automatically varies parameters in the thermal conductivity model to obtain the best match with the experimental data. Numerical experiments indicate that thermal conductivity can be measured over a wide temperature range (approximately 1500 K to 3100 K) within an accuracy of a few percent using this method. An experimental facility has been constructed to validate this technique, and preliminary data up to about 2500 K closely match high temperature results of previous investigators.