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Table 22. Inventories of natural and enriched uranium by material type as of end of year, 2014–2018
thousand pounds U3O8 equivalent
  Inventories at the end of the year
Type of uranium inventory owned by 2014 2015 2016 2017 P2018
Owners and operators of U.S. civilian nuclear power reactors inventories 114,046 121,131 127,964 123,850 111,615
Uranium concentrate (U3O8) 19,060 20,635 20,790 20,612 19,270
Natural UF6 40,803 48,136 53,602 50,615 43,312
Enriched UF6 43,382 41,557 43,743 43,451 40,588
Fabricated fuel (not inserted into a reactor) 10,802 10,803 9,829 9,173 8,445
U.S. supplier inventories 18,682 14,340 16,667 17,818 19,876
Uranium concentrate (U3O8) 6,170 6,289 7,185 7,174 8,285
Natural UF6 W W W 4,364 W
Enriched UF6 W W W 6,280 W
Fabricated fuel (not inserted into a reactor) 0 0 0 0 0
Total commercial inventories 132,728 135,471 144,631 141,668 131,491

P = Preliminary data. Final 2017 inventory data reported in the 2018 survey.
W = Data withheld to avoid disclosure of individual company data.
Note: Totals may not equal sum of components because of independent rounding.
Source: U.S. Energy Information Administration, Form EIA-858, Uranium Marketing Annual Survey (2014–2018)