抄録
Several burnable poison dispersions -TiB2, ZrB2, WB and WB2- in CaO stabilized ZrO2 were subjected to a steep temperature gradient near the melting temperature of ZrO2 to investigate the compatibility of burnable poison materials with ZrO2.
The principal results obtained are as follows: \setlength\labelwidth10mm\setlength\leftmargin13mm\setlength\labelsep3mm[1.] TiB2 and ZrB2 were found to be compatible with ZrO2 up to a high temperature near the melting point of ZrO2. [2.] WB and WB2 were found to be compatible with ZrO2 up to 1900°C.
Above 1900°C, some WB decomposed into W2B and W, and WB2 into WB, W2B and W. In addition, the adequacy of each borides as burnable poison dispersions in ZrO2 was discussed in connection with the fuel element design and the reactor operation condition.
