Earthing grid status

Every nuclear power plant has an underground earthing grid as part of the plant electrical safety system. It is difficult to monitor the ageing of this grid – but likewise very important.

As a step two, ageing measurements were made in a specific ageing grid. The study found that none of the methods for no-dig measurements that had been evaluated were applicable in this specific case, and the measurements were therefore performed on dug-up samples. The measurements showed no significant signs of advanced ageing.

Corrosion analysis shows that the collected samples of earthing grid would have lasted another 40-year-period (or more) in the ground during similar conditions without being severely corroded.