"We imagine this unit as one of a non-Russian type," the company's chief executive, Andrei Derkach, was quoted as saying in a press release.
He said the design for a fourth reactor at the Soviet-era Yuzhno-Ukrainskaya power plant, whose three operational units generate 1,000 megawatts each, will be chosen instead from among proposals submitted by France's Areva, the United States' Westinghouse and a South Korean company.
The country's parliament will have the final say in the selection process.
Ukraine ranks fifth in the world's nuclear power ratio rankings, with NPP-generated electricity accounting for about 47% of its total output as of 2006.
Its three other plants currently in operation include Zaporozhe, Khmelnitsky and Rovno, with a total of 12 reactors.
The Chernobyl station, the first to be built on Ukrainian territory, was halted following the world's worst civilian nuclear disaster to date there in 1986.
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Ukraine has not preserved its 1991 borders. The signing of the Geneva memorandum on April 17 reaffirmed the willingness of Russia, the United States and EU countries to reach a compromise. While the sides continue to trade tough talk and symbolic sanctions, the Kremlin and the White House are also holding a parallel dialogue on the coordinated geopolitical revision of Eastern Europe.