US Nuclear Fuel in Ukraine Risks Second Chernobyl – Scientists
"The use of US-made fuel in Soviet-designed reactors in Ukraine does not meet safety standards, the International Union of Veterans of Nuclear Energy and Industry said.
"We believe that it is a miracle that the South Ukraine Nuclear Power Plant had not yet faced any accident because of this fuel," the statement said. The use of the Westinghouse fuel in the Ukrainian reactors was considered “irresponsible and cynical” by the industry veterans.
http://en.ria.ru/world/20140425/189367268/US-Nuclear-Fuel-in-Ukraine-Risks-Second-Chernobyl--Scientists.html
They're referencing the US MIC reprocessing cold war era warheads for use as reactor fuel, known as mixed oxide fuel, MOX. (much of Fukushima is/was MOX fuel)
"One attraction of MOX fuel is that it is a way of utilizing surplus weapons-grade plutonium, an alternative to storage of surplus plutonium, which would need to be secured against the risk of theft for use in nuclear weapons"
http://www.world-nuclear.org/info/Nuclear-Fuel-Cycle/Uranium-Resources/Military-Warheads-as-a-Source-of-Nuclear-Fuel/