[en] A nuclear refurbishment project is being performed to extend the operating life of the Darlington Nuclear Generating Station. The Initiation phase is currently being executed, which includes an Integrated Safety Review (ISR), Environmental Assessment (EA) and Integrated Implementation Plan (IIP). This paper outlines the phases involved in a refurbishment project and describes the methodology that OPG has developed to perform the Initiation phase of the Refurbishment project. (author)