Ukraine’s State Nuclear Regulatory Inspectorate has approved the transition of South Ukraine-3 to the commercial use of Westinghouse supplied fuel.The regulator signed the relevant paperwork after pilot operation of the unit had shown the fuel was “safe, reliable and efficient”, state-owned nuclear utility Energoatom said.The approval followed “complex and long-term work by Ukrainian, American and Swedish specialists”, according to Natalya Shumkova, Energoatom’s executive director for nuclear and radiation safety and scientific and technical support.