HMNB Devonport

Future arisings of submarine decommissioning wastes assume a continuing naval nuclear propulsion programme with a fleet of up to 7 SSNs (nuclear powered, conventionally armed submarines) and 4 SSBNs (nuclear powered submarines with ballistic nuclear weapons). Submarines are assumed to have a hull life of between 25 and 30 years and to be stored afloat for 30 years before being dismantled and the waste processed. Future arisings of submarine decommissioning wastes are forecast up to 2110.

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Site Owner

Information is presented about wastes that existed at HMNB Devonport at the stock date (1 April 2025) and were forecast to arise after this date.

For background information about this site owner, please refer to the Site Information Sheets in the 2025 UK Radioactive Waste Inventory report.

The following page presents information about radioactive wastes at the specific site selected.

Information about spent fuel and nuclear materials is presented separately in the relevant 2025 Inventory report. For official figures and essential information about how the data has been produced, always refer to the UKRWI 2025 published reports.

View all 2025 waste stream data sheets for HMNB Devonport

Waste groupings

Activated metals
Activated other materials
Asbestos & other insulation materials
Concrete & rubble
Conditioned
Contaminated metals
Contaminated other materials
Desiccant & catalysts
Flocs
Fuel cladding & miscellaneous wastes
Fuel element debris
Fuels & uranium residues
Graphite
High level waste
Inorganic ion exchange materials
Miscellaneous contaminated materials
Mixed wastes
Oils & other fluids
Organic ion exchange materials
Plutonium contaminated materials
Raffinate
Sludges
Soil
Uranium & thorium contaminated material
Total
stored
waste
Future
arising
waste
Lifetime
packaged
waste

Waste categories

Showing results for data originating from HMNB Devonport.

Waste category Volume (m3)
Reported at 1 April 2025 Reported future arisings Lifetime Total
HLW 0 0 0
ILW 15.0 -7.45 7.54
LLW 76.1 627 703
VLLW 0 0 0
Total 91.1 619 711
Waste category Volume (m3)
Reported at 1 April 2025 Reported future arisings Lifetime Total
HLW 0 0 0
ILW 15.0 -7.45 7.54
LLW 64.2 283 347
VLLW 0 0 0
Total 79.2 276 355
Waste category Volume (m3)
Reported at 1 April 2025 Reported future arisings Lifetime Total
HLW 0 0 0
ILW 16.3 -7.36 8.94
LLW 83.7 437 521
VLLW 0 0 0
Total 100 430 530

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Forecast waste arisings

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From Amersham and AWE Aldermaston to Winfrith and Wylfa – you can source site-by-site waste inventory data from sites across the UK nuclear industry here.