2008 Volume 7 Issue 2 Pages 148-157
This work developed a fitting method of buildup factors for shielding calculation to predict the radiation dose of emergency actions in a nuclear power plant (NPP).The deviation for buildup factors of deep penetration calculated by the fitting were carefully estimated by varying the unit penetration depth, fitting range and method of inducing the error direction.Furthermore, as application examples of the optimum fitting parameters selected from the appearance frequency of penetration depth in NPP structures, the dose rates in movement routes during a nuclear disaster and also in recovery action in engineering safe guard system (ESFs) rooms was examined.The following results were obtained:(I) This method can extract the parameters with good accuracy for geometric progression formula (GP) using any fitting range.(2) The most suitable parameters for the evaluation object can be selected by changing the fitting conditions.(3) These GP parameters can be used to predict the radiation dose in the event of emergency action and to determine the priority level with recovery action of ESFs.
