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Inventory differences at UK civil nuclear sites in 2017/18

Site Plutonium
kg (1)		 HEU
kg 235U (2)		 LEU
tU (3)		 Natural U
tU (3)		 Depleted U
tU (3)
Dounreay +0.361 +1.100 +0.001 NIL <-0.001
Harwell +0.003 +0.004 NIL NIL NIL
Winfrith NIL NIL NIL NIL NIL
Sellafield (4) -25.200 <-0.001 -0.050 <+0.001 -13.433
Springfields NIL NIL -1.133 +3.843 +0.203
URENCO Capenhurst (5) N/A N/A <-------------  -0.355 ---------->

+ 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 uranium 235 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. Includes Windscale for which Sellafield Ltd became the site licensee on 1 April 2008
  5. the figure for Urenco Capenhurst is a consolidated figure for Urenco UK Ltd, Enrichment Technology UK Ltd and Capenhurst Nuclear Services