Gas-Cooled Fast Reactor: A Historical Overview and Future Outlook

<table>The <svg height="9.875" id="M7" style="vertical-align:-2.29482pt" version="1.1" viewbox="0 0 7.9375 9.875" width="7.9375" xmlns="http://www.w3.org/2000/svg">
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</svg>-factor for U-233, U-235, Pu-239, and Pu-241. Made with the JANIS data viewer (<a href="http://www.nea.fr/janis">http://www.nea.fr/janis</a>), based on JEFF-3.1 data. Note that U-235 has the lowest  <svg height="9.875" id="M8" style="vertical-align:-2.29482pt" version="1.1" viewbox="0 0 7.9375 9.875" width="7.9375" xmlns="http://www.w3.org/2000/svg">
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</svg> of all isotopes in both the thermal and the fast range. For Pu-239, the breeding potential rapidly increases above 50 keV.</table>

Science and Technology of Nuclear Installations

Gas-Cooled Fast Reactor: A Historical Overview and Future Outlook

Figure 1