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This paper discusses the process used for dedicating an Alco 18-251-F commercial diesel engine for nuclear standby service at Pacific Gas and Electric's Diablo Canyon Power Plant. Completed in 1993, this project was the first commercial grade dedication of a complete diesel generator system under the guidance of the Electric Power Research Institutes (EPRI), “Guideline for the Utilization of Commercial Grade Items in Nuclear Safety Related Applications (NCIG-07)”, Reference 1. All four dedication methods outlined in the guideline were used in this effort, including Special Tests and Inspections, Commercial Grade Survey of Suppliers, Source Verification and Acceptable Supplier/Item Performance Record. The complexity of the dedication effort resulted in extensive review and inspection by the Nuclear Regulatory Commission (NRC).