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Inventory differences at UK civil nuclear sites in 2020/21

Site Plutonium
kg (1)		 HEU
kg 235U (2)		 LEU
tU (3)		 Natural U
tU (3)		 Depleted U
tU (3)
Dounreay
(Dounreay Site Restoration Ltd)		 -0.003 -0.036 +0.001 NIL +0.007
Harwell
(Research Sites Restoration Ltd)		 <+0.001 NIL <+0.001 NIL NIL
Winfrith
(Research Sites Restoration Ltd)		 NIL NIL NIL NIL NIL
Sellafield
(Sellafield Ltd) (4)		 +16.785 <-0.001 -3.121 <+0.001 -0.806
Springfields
(Springfields Fuels Ltd)		 NIL NIL +1.968 +4.324 -0.005
Capenhurst (5)
(URENCO UK Ltd)		 N/A NIL <------------- -0.447 ---------->

+ apparent increase
- apparent decrease

  1. The figures for plutonium are the total amount of all plutonium isotopes.
  2. The figures for highly enriched uranium (HEU) are for the uranium235 content of uranium enriched to above 20% of that isotope.
  3. Low enriched uranium (LEU), natural uranium and depleted uranium cannot be used to make explosive devices. The published figures include these grades for the sake of completeness.
  4. Effective from 2017/18, includes Windscale ID figures
  5. The figure for Urenco Capenhurst is a consolidated figure for Urenco UK Ltd, Urenco Nuclear Stewardship Ltd and URENCO ChemPlants Limited