2023 annual figures for holdings of civil unirradiated plutonium

2023 annual figures for holdings of civil unirradiated plutonium United Kingdom

	National Totals	As of 31 December 2023	Previous year (2022)
		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	137.5	137.4
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.	1.0	1.1
	Total	140.9	140.8

Note:

		As of 31 December 2023	Previous year (2022)
(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
(iii)	Plutonium included in lines 1-4 above which is in international shipment prior to its arrival in the recipient State.	0	0

Estimated amounts of plutonium contained in spent civil reactor fuel - United Kingdom

	National Totals	As of 31 December 2023	Previous year (2022)
		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	9
2.	Plutonium contained in spent fuel at reprocessing plants.	20	19
3.	Plutonium contained in spent fuel held elsewhere.	Less than 500kg	Less than 500kg
	Total	29	28

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 2023	Previous year (2022)
		Kg	Kg
1.	HEU stored at enrichment plants	Less than 1 kg	Less than 1 kg
2.	HEU at fabricating plants or at other reprocessing facilities	412	440
3.	HEU at civil reactor sites	Less than 1 kg	Less than 1 kg
4.	HEU at locations other than civil reactor sites, enrichment fabricating and reprocessing plants (e.g. laboratories, research centres)	87	114
5.	Irradiated HEU at civil reactor sites	5	5
6.	Irradiated HEU at locations other than civil reactor sites	132	131
	Total	636	691

*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 2023	Previous year (2022)
	Rounded to the nearest 100 Tonnes
DNLEU	132000	127979