Trawsfynydd

Trawsfynydd is located on a 15.4 hectare site in Snowdonia National Park, North Wales, Trawsfynydd was the first inland civil Magnox nuclear station and drew its cooling water from Llyn (lake) Trawsfynydd.

The Central Electricity Generating Board was keen to recognise that Trawsfynydd was a Welsh power station, so a large, pebble ‘mosaic’ depicting a Welsh dragon forms the paving of the central courtyard which is now listed on the ‘Register of Historic Parks and Gardens in Wales’.

Trawsfynydd was the first Magnox site to recover radioactive waste from all its waste streams. Wet waste retrievals completed in 2018, followed by bulk fuel element debris retrievals in 2022.

Trawsfynydd is now the lead and learn site for Reactor Dismantling within Magnox’s Rolling Programme of Decommissioning.

On this page
Site Owner

Information is presented about wastes that existed at Trawsfynydd 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 Trawsfynydd

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 Trawsfynydd.

Waste category Volume (m3)
Reported at 1 April 2025 Reported future arisings Lifetime Total
HLW 0 0 0
ILW 1,440 4,580 6,020
LLW 42.3 46,900 46,900
VLLW 0 0 0
Total 1,480 51,400 52,900
Waste category Volume (m3)
Reported at 1 April 2025 Reported future arisings Lifetime Total
HLW 0 0 0
ILW 4,460 5,760 10,200
LLW 54.0 74,700 74,800
VLLW 0 0 0
Total 4,520 80,500 85,000
Waste category Volume (m3)
Reported at 1 April 2025 Reported future arisings Lifetime Total
HLW 0 0 0
ILW 7,620 6,400 14,000
LLW 57.4 79,400 79,500
VLLW 0 0 0
Total 7,670 85,800 93,500

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Forecast waste arisings

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