Isotopic Fuel Compositions in the Sangamon20 Model

<p>The seven csv files each correspond to a different level of fuel burnup in the Sangamon20 (a 20 MWth pebble-bed HTGR) fuel pebbles.&nbsp;fresh_comp.csv provides the composition for UCO in fresh pebbles.&nbsp;1pass_comp.csv provides the fuel composition in pebbles that have gone through one six month pass, 2pass_comp.csv have been through two six month passes, and so forth.</p>