E=mc²  When the first nuclear power plant built in the Netherlands ceased production in 1997, only three sites where nuclear fission is performed remained; a second nuclear power plant (KCB) in Borssele, a research reactor and medical isotopes production facility (NRG) in Petten and a university research reactor (RID) in Delft. These nuclear sites are because of their nature closed bastions and mostly invisible to the public eye.