* A third of Belgium's nuclear capacity closed since last yr
* Reactors should restart in 2-3 weeks (Recasts with regulator confirmation)
By Philip Blenkinsop
BRUSSELS, May 17 Belgium's nuclear safety regulator has given approval for GDF Suez to restart two nuclear reactors closed last year over safety concerns, it said in a report on Friday.
"The Federal Agency for Nuclear Control considers that the Doel 3 and Tihange 2 reactor units can be restarted safely," the report said.
It added that all of the safety concerns had been resolved satisfactorily.
Belgium halted the 1,006-megawatt (MW) Doel 3 reactor in August last year after indications of cracks were discovered on the core tank during ultrasound checks.
A month later, it found similar flaws on the 1,008-MW Tihange 2 after it tested the tank during a routine stoppage, leaving Belgium without a third of its nuclear power generation capacity.
It will take two to three weeks to restart the reactors, a spokeswoman for GDF Suez's Belgian division Electrabel said following the decision. (Writing by Ben Deighton; Editing by Rex Merrifield and Mark Potter)