Extended bias factor method for improvement of prediction accuracy of neutronic characteristics

Kugo, Teruhiko ; Mori, Takamasa; Takeda, Toshikazu*

Extended bias factor method is proposed for improvement of the prediction accuracy of neutronic characteristics of a nuclear energy system. The present method utilizes a number of experimental results and produces a semi-fictitious experimental value by a product of exponentiated experimental values. A bias factor is defined a ratio of the product of exponentiated experimental values to a product of exponentiated calculation values correspoding to the experimental values. By multiplying the bias factor to a design calculation value, it is corrected into a design prediction value. Exponents are determined to minimize a variance of the design prediction value.