Before the cutting work could start, Dounreay workers climbed inside the stack to decontaminate the interior, and remove the remaining pipe work.
A team from Core Cut, a West Lothian-based company who are one of Britain's leading specialists in ‘DiamondWire’ sawing, then moved in and spent a number of days on site turning the stack into scrap.
The workers wore protective oversuits and respirators to protect them from any possibility of contaminated dust as they cut through the quarter inch thick steel.
Each cut had to be meticulously set up and took on average half a day to complete. The stack was cut into 5m lengths, and then cut in half to form two half-pipes which could be stacked one inside the other.
DSRL project manager Graeme Rennie commented: “The size reduction of the redundant DFR stack was quite a challenge especially in severe weather conditions.
“A huge amount of credit is due to the project team, who through their initiative and sheer hard work and determination, completed the task within a matter of months.”
The 24 tonnes of steel was consigned as low level waste in industrial-sized containers.