| Site | Plutonium kg 1 |
HEU kg 235U 2 |
LEU tU 3 |
Natural U tU 3 |
Depleted U tU 3 |
|---|---|---|---|---|---|
| Dounreay | +0.100 | +0.375 | <+0.001 | NIL | + 0.003
|
| Harwell | NIL | NIL | NIL | NIL | NIL |
| Winfrith | NIL | NIL | NIL | NIL | NIL |
| Sellafield4 | +1.121 | +0.004 | -0.069 | >+0.000 | +4.100 |
| Springfields | NIL | NIL | -1.015 | -0.002 | -0.005 |
| URENCO Capenhurst5 |
N/A | NIL | <------------- -5.605 ----------> | ||
+ apparent increase
- apparent decrease
- the figures for plutonium are the total amount of all plutonium isotopes.
- the figures for highly enriched uranium (HEU) are for the uranium235 content of uranium enriched to above 20% of that isotope.
- 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.
- effective from 2017/18, includes Windscale ID figures
- the figure for Urenco Capenhurst is a consolidated figure for Urenco UK Ltd, Urenco Nuclear Stewardship Ltd and URENCO ChemPlants Limited
* The apparent loss noted at URENCO ChemPlant has been investigated and all qualifying nuclear material has been accounted for. An investigation identified contributing factors within operational processes that led to the apparent loss being beyond expected measurement accuracies for this type of facility. Both the physical inventory and operational processes have been further strengthened to provide greater assurance that similar issues will not recur.