Seismic requalification of a safety class crane

This paper reports on a remotely operated five-ton crane within a nuclear fuel handling facility that was designed and constructed over 25 years ago. At that time, less severe design criteria, particularly on seismic loads, 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 loads including those from the design basis earthquake