United Kingdom
| National Totals | As of 31 December 2022 | Previous year (2021) | |
|---|---|---|---|
| Rounded to 100 kg plutonium with quantities less than 50 kg reported as such | |||
| Tonnes | Tonnes | ||
| 1. | Unirradiated separated plutonium in product stores at reprocessing plants | 137 | 137 |
| 2. | Unirradiated separated plutonium in the course of manufacture or fabrication and plutonium contained in unirradiated semi-fabricated or unfinished products at fuel or other fabricating plants or elsewhere | 0.4 | 0.4 |
| 3. | Plutonium contained in unirradiated MOX fuel or other fabricated products at reactor sites or elsewhere | 2.0 | 2.0 |
| 4. | Unirradiated separated plutonium held elsewhere. | 1.1 | 1.2 |
| Total | 140.8 | 140.6 | |
| Note: | As of 31 December 2022 | Previous year (2021) | |
| (i) | Plutonium included in lines 1-4 above belonging to foreign bodies. | 24.1 | 24.1 |
| (ii) | Plutonium in any of the forms in lines 1-4 above held in locations in other countries and therefore not included above | 0.0 | 0.0 |
| (iii) | Plutonium included in lines 1-4 above which is in international shipment prior to its arrival in the recipient State. | 0.0 | 0.0 |
Estimated amounts of plutonium contained in spent civil reactor fuel - United Kingdom
| National Totals | As of 31 December 2022 | Previous year (2021) | |
|---|---|---|---|
| Rounded to 1000 kg plutonium with quantities less than 500 kg reported as such | |||
| Tonnes | Tonnes | ||
| 1. | Plutonium contained in spent fuel at civil reactor sites | 9 | 8 |
| 2. | Plutonium contained in spent fuel at reprocessing plants. | 19 | 18 |
| 3. | Plutonium contained in spent fuel held elsewhere. | Less than 500 kg | Less than 500 kg |
| Total | 28 | 27 | |
Note
i) The treatment of material sent for direct disposal will need further consideration when specific plans for direct disposal have taken concrete form.
Definitions
- Line 1: Covers estimated amounts of plutonium contained in fuel discharged from civil reactors;
- Line 2: Covers estimated amounts of plutonium contained in fuel received at reprocessing plants but not yet reprocessed.
Annual figures for holdings of civil high enriched uranium (HEU)* - United Kingdom
| National Totals | As of 31 December 2022 | Previous year (2021) | |
|---|---|---|---|
| kg | kg | ||
| 1. | HEU stored at enrichment plants | Less than 1kg | Less than 1kg |
| 2. | HEU at fabricating plants or at other reprocessing facilities | 440 | 420 |
| 3. | HEU at civil reactor sites | Less than 1 kg | Less than 1kg |
| 4. | HEU at locations other than civil reactor sites, enrichment fabricating and reprocessing plants (e.g. laboratories, research centres) | 114 | 178 |
| 5. | Irradiated HEU at civil reactor sites | 5 | 5 |
| 6. | Irradiated HEU at locations other than civil reactor sites | 131 | 132 |
| Total | 691 | 734 |
*The definition of high enriched uranium (HEU) is uranium enriched to 20% or more in uranium 235
Annual figures for holdings of civil depleted, natural and low enriched uranium (DNLEU) in the nuclear fuel cycle - United Kingdom
| National Total | As of 31 December 2022 | Previous year (2021) |
|---|---|---|
| Rounded to the nearest 100 Tonnes | ||
| DNLEU | 127979 Tonnes | 122756 Tonnes |