Dounreay’s decommissioning team has knocked down one of the oldest structures on the site.
The structure was a large concrete circular water tank which dated back to the days when Dounreay was a wartime airfield. It was intended to be used to fight fires on the airfield. As it was tucked away in a corner of the site, the tank had been left undisturbed for decades.
The decommissioning team siphoned off 140m3 of liquid from the tank which was then discharged off site via the low level effluent treatment plant. This left a thick layer of organic sludge and debris in the bottom of the tank.
The sludge posed both a potential radiological and biohazard and after extensive sampling, 100m3 of sludge was removed, cemented and consigned as waste. The empty concrete tank was finally cleaned and demolished and the resulting 15 tonne of concrete crushed and prepared for reuse on site as infill material.