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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The United States and Russia signed an agreement to dispose of sixty-eight tons of weapons-grade plutonium. They plan to use the plutonium as fuel for civilian nuclear reactors.

美国和俄罗斯签署协议，计划处置68吨武器级放射性钚，将其做为民用核反应堆的燃料。

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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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On Monday,Iran formally notified the IAEA of its response to the nuclear-fuel swap deal, under which it would ship some low-enriched uranium to Turkey in return for higher grade fuel for a Tehran research reactor.

VOA: standard.2010.05.25

(Sound) Amid loud acclamations of approval, top hardline Iranian cleric, Hojatoleslam Ahmad Khatami warned the West that Tehran will produce its own high-grade uranium for a medical research reactor, if the UN International Atomic Energy Agency refuses to provide the fuel.

VOA: standard.2009.11.28

Liquids are then filtered and gases are extracted through condensers ready for conversion to higher grade fuel.

CNN: Turning carbon dioxide into fuel

That is presuming that the Iranian claim to have the capacity to produce in abundance the higher-grade fuel is correct.

CNN: What does Iran want from nuclear talks?

This has led to a spike in demand, which has actually shifted toward higher-grade fuel, while at the same time cramping investment.

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