Maliaño, 24th of July 2019.- Equipos Nucleares S.A., S.M.E (Ensa) completed successfully the electropolishing of a new steam generator ND 1300 at the Framatome facilities in Saint Marcel, France.
This is the sixth steam generator that the state company places in Maliaño makes to the French company. The first one was carried out in 2017, five more during 2018 and with this one the current order is concluded. Ensa is already preparing to electropolish another 8 steam generators also for Framatome but this time at its facilities in Cantabria.
The electropolishing of the channel head is carried out at the end of its manufacture, before the hydraulic test and aims to soften the microstructural irregularities of the surface to avoid the fixation of radioactive contamination during the service life of the equipment allowing the reduction of the operational dose rate during the maintenance interventions.
The surface treatment consists on two phases: a mechanical polishing by grinding with 7 different grains and an electrochemical polishing with current in an acid medium. The works are completed with the performance of the required controls, during and at the end of the process: visual examinations, roughness measurement, take of surface replicates for its later visualization in a scanning electron microscopy, cleaning verification and control of foreign objects.
Ensa has done these works with its subsidiary Enwesa.