Measurements and Analysis of Reactivity Worth of Rare-Earth Elements at Kyoto University Critical Assembly

摘要

Critical experiments loaded with rare-earth elements (Dy, Ho, Er and Tm) were carried out and their reactivity worth were measured at the solid moderated core of Kyoto University Critical Assembly (KUCA). The measured reactivity worth was compared with calculation results by the continuous energy Monte-Carlo code MVP using various cross section. The calculation results of the reactivity worth agree with the measured value approximately within statistical uncertainty (one standard deviation), although the standard deviation and the experimental error are about 3% in relative value, respectively. The present preliminary analysis suggests the validity of the cross section data of the rare-earth elements used in the Monte-Carlo calculations.