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Flamanville EPR Reaches 100% Nuclear Power for First Time After Regulator Approval

EDF begins full‑power checks with output varying in the coming weeks before completing commissioning.

Overview

  • EDF said the unit reached 100% nuclear power at 11:37 on 14 December, producing 1,669 MW of gross electricity.
  • The step followed ASNR’s 12 December authorization to raise output beyond 80% of nominal power.
  • Full‑power operation enables comprehensive equipment testing during a phase of variable output across different power levels.
  • EDF plans an in‑service replacement of a 400 kV bushing on an internal electrical post while keeping the reactor connected to the grid.
  • The project is France’s first new reactor in 25 years, is about 12 years late with costs estimated near €23.7 billion by the Cour des comptes, and is the fleet’s most powerful with capacity to supply around two million households.