A Survey of Crane Operating Experience at U.S. Nuclear Power Plants from 1968 through 2002 (NUREG-1774)

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Publication Information

Manuscript Completed: June 2003
Date Published: July 2003

Prepared by
R.L. Lloyd

Division of Systems Analysis and Regulatory Effectiveness
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

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This report was written in response to a candidate generic issue 186, "Potential Risk and Consequences of Heavy Load Drops in Nuclear Power Plants," to determine the likelihood and significance of heavy load drops. This report describes the results of a detailed review of crane operating experience at U.S. nuclear power plants from 1968 through 2002. Crane operating experience information was obtained from several sources including; actual crane operating experience from U.S. nuclear power plants, licensee event reports (10 CFR 50.72 and 10 CFR 50.73), NRC inspection reports, licensee correspondence, and crane vendor reports. This report lists the causes and results of documented crane issues, and estimates the probabilities of selected load drop events. To provide additional insights, included with this report are major crane operating experience reports issued by the New Mexico Environmental Evaluation Group, the Department of Energy, the Department of the Navy, and the California Division of Occupational Safety and Health. The operational experience and human performance insights contained in this report can be used to enhance the control of heavy loads to reduce the likelihood of crane accidents, particularly those that have the potential to release radioactive material. This report also will be used as a technical basis for recommendations that may initiate changes to NRC regulatory requirements, programmatic controls, or evaluations of heavy load movements at U.S. nuclear power plants.

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