Senior Project Manager

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Magnox North

Magnox North is the management and operations contractor responsible for the day-to-day operation of the site under contract to the Nuclear Decommissioning Authority.

Trawsfynydd decommissioning site is located in the heart of Snowdonia National Park. It is a twin reactor station now defuelled and being decommissioned. When operational the station produced enough electricity to meet the needs of a city the size of Manchester. Decommissioning commenced in 1993 and defuelling of the reactors was completed in 21 months, four months ahead of schedule and under budget. The decommissioning strategy at Trawsfynydd has been strongly influenced by the fact that it is located in the Snowdonia National Park.
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.

Lifetime Plan
Trawsfynydd’s decommissioning programme is now entering its fourteenth year with defuelling successfully completed and key project milestones reached including the demolition and landscaping of the turbine hall and cooling water pumphouse.

The decommissioning plan at Trawsfynydd

1995-2015 Preparation for Care & Maintenance

• Building of a waste store for the treatment and packaging of Intermediate-Level Waste (ILW) that has accumulated in storage vaults on the site during generation operations – due for completion 2007
• Demolition of the ponds complex once operational legacy waste is recovered and processed for safe and stable site storage – scheduled for demolition 2011
• Completion of all waste management, dismantling and demolition work, removing most radioactive and non-radioactive plant and buildings
• Safestore buildings construction – reducing the Reactor buildings in height to minimise the environmental impact and placing them into a passive, safe and secure state

2015-2088 Care & Maintenance
 
• Site monitored for reactor conditions and security as the radioactivity inside the reactors naturally decays
• Radiological and environmental monitoring
• Regular inspection of site conditions and maintenance where necessary
• All stored packaged waste transported for permanent disposal off site and demolition of the waste store once a National Repository for ILW becomes available

2088-2098 Final Site Clearance

• Deplanting and dismantling of the remaining site utilities, facilities and buildings
• Land remediation including landscaping and planting
• Site delicenced and returned, clean and safe for future use