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.
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.
Waste groupings
stored
waste
arising
waste
packaged
waste
Waste categories
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