Discussion of Available Methods to Support Reviews of Spent Fuel Storage Installation Cask Drop Evaluations.

摘要

Applicants seeking a Certificate of Compliance for an Independent Spent Fuel Storage Installation (ISFSI) cask must evaluate the consequences of a handling accident resulting in a drop or tip-over of the cask onto a concrete storage pad. As a result, analytical modeling approaches that might be used to evaluate the impact of cylindrical containers onto concrete pads are needed. One such approach, described and benchmarked in NUREG/CR-6608,(sup 1) consists of a dynamic finite element analysis using a concrete material model available in DYNA3D(sup 2) and in LS-DYNA, (sup 3) together with a method for post-processing the analysis results to calculate the deceleration of a solid steel billet when subjected to a drop or tip-over onto a concrete storage pad. Because the analysis approach described in NUREG/CR-6608 is somewhat difficult to use, a simpler approach is sought. The purpose of this effort is to find the simplest possible way to analytically represent the storage cask deceleration during a cask tip-over or a cask drop onto a concrete storage pad. This report is divided into three sections. The Section II provides a summary of the literature search on concrete finite element models. The Section III discusses commercial codes. The Section IV provides recommendations.