Dungeness B Decommissioning: A Century-Long Endeavor

The construction of Dungeness B nuclear power station spanned approximately 16 years, yet restoring the site to its pristine condition is projected to require almost a century. This illustrates the magnitude of the undertaking for EDF as it proceeds with the defueling of this long-standing facility, situated on a secluded headland along the Kent coastline. Operations at Dungeness ceased in 2018 when its turbines stopped, and following the decision to halt electricity generation, the plant’s defueling process commenced. The immense scope of this operation is evident within the vast reactor hall. Beneath the floor lie the uranium-containing fuel assemblies that supplied power to the station’s pair of nuclear reactors. Each reactor contains over 400 rod-filled assemblies, and their safe removal is estimated to take six years. This procedure is carried out using a massive 2,000-tonne crane, which meticulously lifts each assembly before transferring it to another section of the facility for cooling. Paul Windle, the Plant Manager, stated: “So far we have removed around 25% of the fuel from one reactor. We have got a long journey ahead.” Subsequent to removal from the reactor hall, the fuel is transported to an area known as the ponds. There, the still-hot fuel is submerged in water for a period of 90 days until it is considered sufficiently safe for transfer into steel flasks. These flasks will then be loaded onto lorries for transport to a nuclear waste facility located at Sellafield in Cumbria. Dungeness B represented the inaugural advanced gas-cooled nuclear reactor whose construction commenced in the UK. It stood as a pioneer in 20th-century nuclear power generation. Nevertheless, due to technical difficulties deemed excessively costly and complex to resolve, EDF made the decision to discontinue energy production. Gavin Lancaster, the station director, commented: “Some of the components date from the 1960s and the 1970s when we constructed. When we then did the analysis and the modelling, we determined that rectifying those components could be done – but it would take time and cost, and subsequently we made the correct decision at the time to cease generation.” Approximately 700 individuals remain employed at the site. Emily Teehan, an electrical maintenance technician, has been working at Dungeness for seven years. She remarked: “I came here on a school trip and I thought ‘this looks really fun’. I applied for an apprenticeship and here I am.” Chloe Tilly, an Environment safety engineer, represents the third generation of her family to be employed at the power station. She stated: “From grandads, grandmas, cousins, brother, lots of people . It’s the biggest employer round here, we feel very fortunate to have it on our doorstep.” Dungeness B commenced its connection to the national grid in April 1983, ceasing electricity generation in September 2018. Throughout its operational period, it generated 142 terawatt-hours of electricity, an amount sufficient to supply power to every household in Kent for over 50 years. Regarding the prospect of constructing another nuclear power plant at this location, Mr. Lancaster commented: “This is a great location for new nuclear. We have got a skilled workforce and a very engaged supportive community so certainly we are open to discussions.”