Site History
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Built in the late 1950s/early 1960s, Trawsfynydd started service in 1965 and generated electricity for 26 years before it reached the end of its service life in 1991. Trawsfynydd was the first inland civil Magnox nuclear power station and drew its cooling water, at the rate of 35 million gallons an hour, from the man-made Trawsfynydd lake, originally built in the 1920s as part of a hydro-electric project at Maentwrog and still in use today.
Site operations
1965-1989: Central Electricity Generating Board (CEGB)
1989-1994: Nuclear Electric plc (following the part privatisation of the CEGB)
1994-1998: Magnox Electric plc (following the transfer of the AGR and PWR nuclear power stations to British Energy plc)
1998-2004: British Nuclear Fuels plc
2004 to date: The Nuclear Decommissioning Authority (following the restructuring of the UK nuclear industry and transfer of all UK nuclear legacy to the NDA)
Significant Dates
1959 - 1965 Construction of the site
1965 -1991 Generation
1968 Official opening by James Griffiths, Secretary of State for Wales
1991 Generation ceased
1993 Site officially closed.
1993 - 1995 De-fuelling
1995 De-planting and decommissioning
1998 Ponds drained
2003 Demolition of Turbine Hall
2005 MAC (North) Vault emptied, FED (South) Recovery commences
2005 Bailey bridge & Pontoon removed
2005 Cold Water Pumphouse decommissioned & demolished
2005 Construction of ILW Store commences
2005 Removal of first boiler sections R1 (North)
2006 Ponds Scabbling commences
Completion of Reactor 1 (North) Boiler Section Removal
Site awarded 3rd consecutive RoSPA Gold Medal
2006 Active Waste Vault B4 emptied
2006 First liner of Sludge exported from the Main Sludge Vault
2006 Site End State Consultation Commences
2006 Bulk retrieval of Resin from Resin Vault 1 completed
2006 Site End State Report delivered to the NDA
2007 Active Waste Vault B3 emptied.
2007 Completion of Hot Gas Ducts Removal
2007 Removal of first boiler sections Reactor 2 (South)
2007 Boiler section removal in Reactor2 South is now complete
2007 Completion of the Intermediate Level Waste Store
2008 Work commenced to install Capping Roof on Reactor 2 Charge Hall
2008 Completion of recovery of the first Intermediate Level Waste (ILW) stream in the UK - MAC
2009 Completion of Partial Relocation of Primary Circuit Components (PRPCC)
