Abstract
The need for fast reactors in nuclear power is discussed. The advantages of fast helium reactors over fast liquid-metal reactors are shown. Fast helium reactor concepts and the possibilities of improving breeding by using fuel of higher density than oxide fuel, specifically, carbides and nitrides, are examined. It is indicated that the development and use of high-temperature helium-cooled thermal- and fast-neutron reactors are promising as part of an international collaboration in nuclear power in the 21st century.
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