Around 40 employees at the Doel nuclear power plant, East Flanders, have been summoned to take a lie detector test.
Investigators hope the test will provide a breakthrough in their inquiry into what happened nearly a year ago at the plant, when it was sabotaged by unknown culprits.
The inquiry has so far proceeded with difficulty. As a result, nearly all the engineers, technicians and other workers who were in the turbine hall of the nuclear power plant at the time the sabotage took place have been invited to submit themselves to a lie detector test.
Around 40 people have been requested to come forward.