Simple determination of low power on reflected reactors using Feynman- experiment

Okajima, Shigeaki  ; Narita, M.*; Kobayashi, Keiji*

When a low power meter for a reactor is calibrated by using the Feynman- methode, the absolute power is obtained by the product of the power deduced from the one-point reactor formula and the -factor which was introduced as the spatila correction factor on the Rossi- measurement. In this paper, for the purpose of ezperimental usage, formulae of the -factor for the different geometries are derived by one speed approximation and its characteristics are systematically surveyed. A simple formula of the -factor for a spherical core is presented and applied. This formula can estimate the value of the -factor with appropriate accuracy.