Abstract
Cesium has important influences on the steady state and transient behavior of nuclear reactor fuel because of its large fission yield and high volatility. Recent experiments show that the release of cesium coincides with the disruptive behavior of rapidly heated fuel. This report investigates the pressure buildup of cesium in fuel pores during fast power transients. A model was developed which estimates the pressure of cesium in the pores as a function of temperature and oxygen/metal ratio of the fuel. The results of the calculation with this model show that cesium has a higher potential for pressure buildup, at temperatures near the fuel melting point, than xenon. There are, however, open questions which concern the kinetics of the cesium release to the pores, the chemical stability of the cesium compounds, and the microscopic distribution of the cesium.
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