NUVIA Structure and its partner, the German company BALCKE DÜRR, are re-tubing one part of the cooling circuit condensers in Cattenom and Cruas NPP. Works are under way in 2015 up to 2016.

This project should eventually allow the joint venture NUVIA Structure – BALCKE DURR to complete annually at least one project of re-tubing work until 2019.


  • Studies
  • Procurement
  • Development of specific tools and processes for onsite work (handling, platform, etc.)
  • In situ tube replacement and related logistics

Project challenges

  • New activity for NUVIA Structure, qualification of a new stakeholder for retubing work in NPP.
  • Very tight schedule (operations performed on site during outage)
  • Pooling of NUVIA Structure and BALCKE DURR expertise covering all technical and organizational aspectsN
  • Ensure a level of quality control in compliance with nuclear safety standards

Technical solutions implemented

  • Specific tools developed by BALCKE DURR for retubing work
  • Use of a 3D laser scan on site for data collection
  • Design and use of a specific platform for interventions
  • Design and manufacturing of specific handling tools
  • Nusoft DM for tracking the production of project documents


Country: FRANCE


Client: EDF CNPE
Awarding authority: EDF – CNPE
Commissioning body: EDF – CNPE
General contracting: NUVIA Structure – BALCKE DURR Joint venture


Dates : 2014 up to 2019
42 000 tubes to replace
120 workers on site at the peak of the activity


Engine room