Application of practical FSD reduction technique for MCNP code in the spent fuel cask shielding analysis

Year
2016
Author(s)
Naoto Kubota - Design Division, OCL corporation, Nakanoshima Intes, 6-2-40, Nakanoshima, Kita-Ku, Osaka 530-0005, Japan
Daisuke Shimizu - Design Division, OCL corporation, Nakanoshima Intes, 6-2-40, Nakanoshima, Kita-Ku, Osaka 530-0005, Japan
Tsutomu Matsumoto - OCL Corporation Osaka, Japan
File Attachment
F2045.pdf229.02 KB
Abstract
In order to apply the MCNP code to shielding analysis of spent fuel casks, the reduction of Fractional Standard Deviation (FSD) is an important issue of the practical use, especially in the calculation for Fission Products (FP) gamma rays. Among the FSD reduction techniques, Energy Group Division Method using Weight Window Generator (WWG) built-in MCNP code is an effective method that can be applied to the calculation for FP gamma rays. In the result of applying the Energy Group Division Method to some casks in actual, some effectiveness against the FSD reduction is obtained. Here, we present an example of using the Energy Group Division Method for FP gamma rays shielding analysis of a transport/storage cask for spent fuel.