US-based Jacobs said on 4 August that it had been selected to lead two decommissioning projects at the Dounreay nuclear site in Scotland, U.K., which Dounreay Site Restoration Ltd (DSRL) estimates to have a combined value of $15.9 million. Jacobs will upgrade the ventilation systems for the Prototype Fast Reactor (PFR) under a $9.94 million contract from DSRL, the company responsible for cleaning up the site, on behalf of the Nuclear Decommissioning Authority. DSRL has also chosen Jacobs to develop the decommissioning strategy for the Fast Reactor Fuel Reprocessing Plant (FRFRP) under a contract worth $5.96 million.

"We will deploy our full range of project management, technical and delivery capabilities for these projects, which involve some of the most challenging buildings at Dounreay and are crucial to achieve the scheduled interim end state," said Jacobs Energy, Security and Technology Senior Vice President Karen Wiemelt. "These projects continue the complex work Jacobs has performed to make the site and surrounding areas safe and clean for future generations."

DSRL Head of Reactors Phil Cartwright said: "At PFR there are a number of unique decommissioning challenges. Replacement of the ventilation system will enable us to safely complete the decommissioning work, whilst ensuring the required environmental controls are in place, over the next 10-15 years."

The scope of the PFR project includes removal of the existing vent plant and design, manufacturing, testing, installation and commissioning of a new discharge stack, new supply and extract fans, new HEPA filters, replacement of containment dampers, discharge contamination monitoring equipment and a new tritium monitoring system. Designed in the early 1960s, the PFR was a mox-fuelled, liquid sodium-cooled fast reactor, which began supplying the National Grid in January 1975 and was taken offline in 1994. The FRFRP, built in the 1950s to reprocess used fuel from the UK's experimental fast reactors, ceased operations in the mid-1990s.

Image: Prototype Fast Reactor (Courtesy of Dounreay Site Restoration Ltd)