Skip to content

Inventory differences at UK civil nuclear sites in 2018/19

Site Plutonium
kg (1)		 HEU
kg 235U (2)		 LEU
tU (3)		 Natural U
tU (3)		 Depleted U
tU (3)
Dounreay <+0.001 -0.468 <+0.001 <+0.001 <+0.001
Harwell +0.007 +0.069 +0.020 +0.009 +0.006
Winfrith NIL NIL NIL NIL NIL
Sellafield (4) -38.460 <+0.001 +1.041 <-0.001 -12.135
Springfields NIL NIL +0.969 -0.744 +1.457
URENCO Capenhurst (5) N/A NIL <-------------  -0.328 ---------->

+ 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 figure
  5. the figure for Urenco Capenhurst is a consolidated figure for Urenco UK Ltd and Urenco Nuclear Stewardship Ltd