Eddy Current for Sizing Cracks in Canisters for Dry Storage Casks - Laboratory Measurements

摘要

The storage of used nuclear fuel (UNF) in dry canister storage systems (DCSSs) at Independent Spent Fuel Storage Installations sites is a temporary measure to accommodate UNF inventory until it can be transferred to a repository for permanent disposal. It is recognized that spent fuel may require storage in DCSSs for much longer periods than were originally anticipated. The eddy current method is presented as a potential tool for inspecting the outer surfaces of DCSS canisters for degradation, particularly atmospheric stress corrosion cracking (SCC). Previous work has focused on modeling that was performed to explore the feasibility of sizing SCC flaws in canisters using an eddy current technique. A multi-frequency approach was simulated and frequency responses from 5 kHz to 100 kHz are presented in an effort to identify potential distinguishing features that will facilitate accurate depth sizing of atmospheric SCC flaws from eddy current measurements. This paper presents the results of efforts to date to benchmark the modeling results with laboratory data.