Abstract

An instrumented capsule for in-reactor creep studies of ceramic nuclear fuels at high fission rates has been designed, fabricated and succesfully operated. The capsule contains a device for loading the creep specimen in compression from 0 to 13,000 psi. The temperature is adjusted by means of both internal electrical heaters and a gas gap. The deformation of the specimen during creep is continuously measured by means of a constant gas flow, variable orifice device. Creep studies have been conducted in the Battelle Research Reactor on UO 2-22 w/o PuO 2 in the temperature range of 350 to 600°C, the stress range of 4000 to 8000 psi and the fission rate of 3.8 × 10 13 fissions/cm 3 sec. The creep rate under these conditions was found to be substantially increased as a result of the fission process.

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