Significance of Cesium in LMFBR and LWR Safety Analysis

摘要

The significance of cesium, which is the most abundant volatile fission product in reactor fuels, is shown for LMFBR and LWR safety analysis. The conclusion for the LMFBR case is that apparently a high potential for fuel motion induced by cesium pressures exists. The magnitude of this effect should be clarified by in-pile vapor pressure measurements on Cs sub 2 UO sub 4 and Cs sub 2 UOsub(3.56). In the LWR case, cesium isotopes play an important role in the overall health risk from released fission products. Cesium vapor pressure measurements on Cs sub 2 MoO sub 4 and Cs sub 2 UO sub 4 would provide fundamental input data for mechanistic LWR release codes which are presently under development at different laboratories. A test matrix of five experiments is proposed. The tests are based on already existing in-pile techniques. (ERA citation 10:011164)