Computational study on the buckling-reactivity conversion factor in light water moderated UO(sub 2) core

摘要

The buckling-reactivity conversion factor (K-value) which is used in the water level worth method is one of the most important constants of the Tank-type Critical Assembly (TCA) of Japan Atomic Energy Research Institute. The K-value has been considered a constant value regardless of the core configurations. Computational study on the K-value was performed by means of two-dimensional transport perturbation theory to investigate how much the K-value varies among various core configurations in light water moderated and reflected UO(sub 2) cores. The calculation indicates that the K-value varies by 5 % within the limits of this investigation. The varience of the K-value components of fuel cell and other regions cancel out each other, which makes the varience of the K-values over various core configurations relatively small. (author). (ERA citation 19:009108)