newspaper tages anzeiger commented in october 2015 that two independent sources have confirmed that the reactor 1 pressure vessel contains around 1,000 cavities of half a centimetre in diameter. similar cavities, although smaller in number, size and extension, were first discovered in the belgian doel 3 reactor, consequently the swiss federal nuclear safety inspectorate (ensi) asked beznau and gösgen npps to perform adequate testing on their reactor pressure vessel. it must be said that the flaw indications in the belgian npps (doel-3 and tihange-2) did not cause the definitive shut down of the reactors. indeed, both reactors resumed operations once all the needed tests were passed. unit 1 has been shut down since the discovery of such material defects. a restart was expected in 2016 in case of positive test results, but since april 2017 no deadline for a restart was announced.