On 2 July 2009, the Ministry of Industry, Tourism and Trade compromised, extending the operating license for an additional four years subject to safety upgrades, though this extension was never used.

[7] However, new concerns on security raised later, in May 2017, as a result of a complaint about the working conditions in a waste store, which was received by the inspection just two days after the approval of the nuclear regulator to the extension of the plant.

The waste deposit holds 2,800 radioactive drums that need reprocessing and some of them "have lost integrity and the residue is dispersed inside the silo", according to the CSN.

[9] In March 2015 Nuclenor announced that inspections made in November and December 2014 checked the reactor vessel good condition, with no manufacturing defects detected.

More than forty GE Hitachi and Tecnatom experts collected data from nine million points on the vessel's surface, for more than 1000 hours and using advanced ultrasound systems and submersible robots.