Seismic requalification of a safety class crane

A remotely operated 5-ton crane within a nuclear fuel handling facility was designed and constructed over 25 years ago. At that time, less severe design criteria, particularly on seismic loadings, were in use. This crane is being reactivated and requalified under new design criteria with loads including a site specific design basis earthquake. Detailed analyses of the crane show that the maximum stress coefficient is less than 90% of the code allowable, indicating that this existing crane is able to withstand loadings including those from the design basis earthquake. 3 refs., 8 figs., 2 tabs.