NUCLEAR CHARACTERISTIC CALCULATION RESULT CORRECTION DEVICE AND CORRECTION METHOD

摘要

PROBLEM TO BE SOLVED: To set a safety tolerance rationally balancing safety and economical efficiency of spent nuclear fuel by rationally performing quantitative evaluation of an uncertainty included in a calculated value of reactivity of the spent nuclear fuel.SOLUTION: A nuclear characteristic calculation result correction device includes: a cross-sectional area covariance error matrix computing section 114 for computing an uncertainty by an input value; an objective system sensitivity coefficient vector computing section 116 for computing a sensitivity for the input value; an experimental system sensitivity coefficient vector computing section 115 for computing a sensitivity in an experimental system; a simulation property evaluation factor computing section 118; a linear coupling constant computing section 117; a cross-sectional area causing uncertainty estimation section 120 for calculating an uncertainty caused by the reaction cross-sectional area by using a conversion factor r which is a comparison between an experimental result and a computation result; an atom density causing physical quantity uncertainty computing section 123 for calculating an uncertainty of an atom density; and a physical quantity calculation result correction section 126 for correcting a calculation result of the objective system.