Reuters Staff
* EDF says safety of reactor not affected
* Weldings designed to be unbreakable are substandard
* Regulator ASN studying technical files about the flaws (Adds technical detail, quotes, background)
By Geert De Clercq
PARIS, Feb 22 (Reuters) - French state-controlled power group EDF said some weldings on its new Flamanville nuclear reactor did not meet required specifications but this did not affect safety or the schedule to load it with fuel at the end (...)