UPDATE 2-GDF Suez sticks to targets after Q1 sales rise

at 25.5 billion euros * Q1 EBITDA up 6.1 pct at 5.5 bln euros * Interim dividend unchanged at 0.83 euros/share * Says still committed to nuclear energy (Adds CEO's comments, background) By Muriel Boselli and Benjamin Mallet PARIS, May 2 (Reuters) -...