Enriching raw uranium is more expensive than converting highly enriched uranium to fuel grade.

浓缩原铀比将高浓缩铀转化至燃料品级更昂贵。

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Professor Bunn says there are currently about 130 research reactors around the world that still use highly enriched uranium for fuel.

邦教授提到目前全世界大约有130个利用高浓缩铀作为燃料的反应堆。

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It calls for Iran to trade about 80 percent of its domestically produced low-grade uranium for more highly enriched nuclear fuel from France and Russia.

协议草案要求伊朗用80%的自行生产的低纯度的铀从法国和俄罗斯换取高浓缩的核燃料。

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So, they essentially proposed building a new facility for uranium enrichment in Russia with Iranian management, Iranian financial participation, that would be devoted exclusively to producing highly enriched uranium nuclear fuel for the Iranians.

NPR: Iran's Response to International Pressure over Nukes

The traces of highly-enriched (not just fuel-grade) uranium, their deception, their heavy water plant and other indicators brand their program as one designed to develop nuclear weapons even in the absence of considering their rhetoric about destroying Israel and ending the world.

CENTERFORSECURITYPOLICY: Next Steps in the Iran Crisis

The authority has also proposed moving other material called "exotics", which includes fuel containing highly-enriched uranium, from Dounreay to Sellafield at a later date.

BBC: Nuclear material moved by train from Scotland to England