As indicated in the press release dated 21 October 2016, EDF Group submitted on 7 October 2016 a technical report to the French Safety Authority (ASN), supporting the fully safe operation of all the reactors concerned by the issue of carbon segregation in the steam generators bottom heads. In the light of the exchanges with the ASN on this issue, EDF Group informed the electricity markets this morning that restart of 5 reactors- Bugey 4, Gravelines 2, and Tricastin 1 3 and 4- was pushed back to the end of December 2016 .