Trawsfynydd Decommissioning Hits Major Milestone

Trawsfynydd decommissioning marks a significant chapter in the history of the UK's nuclear energy landscape. Originally constructed in the early 1960s, the Trawsfynydd power station generated electricity for nearly three decades and stands out as the only inland nuclear power station in the UK. With the cessation of operations, the site has been dedicated to safely managing its legacy, prioritizing risk reduction and preparations for long-term decommissioning. After two decades of innovation, teamwork, and commitment, the Higher Activity Waste (HAW) programme has reached a successful conclusion. This initiative was focused on the safe management and storage of radioactive waste resulting from the facility's past operations. The task required sustained effort and careful implementation over many years. The HAW programme specifically targeted intermediate-level waste, a mid-range category of radioactive materials that is less hazardous than high-level waste but more active than everyday low-level waste. The project involved retrieving legacy materials, processing them safely, and securing them in long-term storage on-site. In total, nearly 2,300 individual waste packages were completed, marking a significant achievement and the removal of numerous hazards from the site. Rob Fletcher, CEO of Nuclear Restoration Services (NRS), remarked that the completion of this programme denotes a pivotal moment for Trawsfynydd. “This is not merely the conclusion of a major programme; it signifies the end of an era,” he stated. The safe and successful execution of this work has facilitated Trawsfynydd's transition into a new phase, which includes reducing the height of the reactors by nearly 50%. This change will create the most visible alteration to the landscape in decades. Tom Williams, Site Director at NRS Trawsfynydd, commented, "Completing the HAW programme is an extraordinary accomplishment for the entire team at Trawsfynydd. Its completion signifies a substantial milestone in our decommissioning mission; one we can take pride in while eagerly anticipating our upcoming projects." The last waste package has been transferred into storage, effectively bringing an end to this lengthy programme. Throughout this initiative, teams developed practical and innovative methods to safely retrieve the waste, including employing a robotic arm for deep storage retrieval and utilizing specialized vacuum equipment to collect fine dust and small particles. Knowledge gained from these efforts has been shared across various sites nationwide, enhancing efficiency, cutting costs, and supporting broader decommissioning efforts. As Trawsfynydd strides into this new phase, the conclusion of the HAW programme exemplifies successful delivery, teamwork, and enduring commitment. It stands as a moment of pride for all involved in its execution. Clive Nixon, Chief Nuclear Strategy Officer at the Nuclear Decommissioning Authority (NDA), stated, "This milestone illustrates the substantial progress we are making in fulfilling our mission on behalf of the government to safely, securely, and cost-effectively clean up the UK's earliest nuclear sites. Our priority remains the reduction of the highest hazards and risks while safeguarding people, communities, and the environment." The upcoming phase of work will entail lowering the reactors' heights, thereby taking a significant step toward their dismantling and fulfilling our commitment to Trawsfynydd decommissioning. In October 2025, Costain was announced as the principal contractor tasked with reducing the height of the reactor buildings from approximately 54 meters to 29 meters. This project, estimated to cost up to £70 million, is projected to span four years. At its peak, Costain is anticipated to employ over 100 individuals, fostering opportunities for regional skills development and contributing positively to the local economy. For further insights and updates, please visit [UK Government Nuclear Resources](https://www.gov.uk/government/news/landmark-decommissioning-milestone-reached-at-trawsfynydd) and [Nuclear Decommissioning Authority](https://www.gov.uk/government/organisations/nuclear-decommissioning-authority). Explore more about Trawsfynydd nuclear topics at [www.globemigrant.com/trawsfynydd](http://www.globemigrant.com/trawsfynydd) and visit our resources on decommissioning developments at [www.globemigrant.com/decommissioning](http://www.globemigrant.com/decommissioning).

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