AN MD90 REJECTED TKOF AT 30 KTS DUE TO FAILURE OF THE R AC GENERATOR. R GENERATOR HAD A LONG CHRONIC MAINT HISTORY.

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WHEN WE ARRIVED AT THE ACFT WE FOUND MECHS SIGNING OFF A R GENERATOR WRITE-UP. THIS WAS A REPEAT WRITE-UP. THE PROB HAD OCCURRED 4 TIMES IN THE PAST 3 DAYS AND OUR OCCURRENCE MADE IT 5 -- 2 TIMES INFLT AND 3 TIMES (INCLUDING OURS) ON TKOF ROLL. IN OUR RESEARCH OF THE PROB; WE FOUND THAT THE ACFT HAD PREVIOUSLY BEEN DISPATCHED WITH THE R GENERATOR (MCO) INOP AND THAT IT HAD BEEN SIGNED OFF AT LEAST 2 TIMES AFTER REPLACING SOME COMPONENTS. THE PREVIOUS CREW HAD BRIEFED OUR JUMP SEAT RIDER ON THE PROB SO WE WERE WELL AWARE. WE DECIDED TO KEEP THE APU RUNNING IN CASE THE PROB RECURRED ON OUR FLT. HERE'S WHAT HAPPENED TO US. WHEN CLRED FOR TKOF; I ADVANCED THE THROTTLES TO THE 1.2 EPR POS AND WAS WAITING FOR THE ENGS TO SPOOL UP TO ENGAGE THE AUTOTHROTTLES. PRIOR TO AUTOTHROTTLE ENGAGEMENT WITH THE ACFT ROLLING AT ABOUT 30 KTS; WE GOT THE ANNUNCIATION 'R AC PWR FAULT' AND 'R GENERATOR OFF;' AND I ELECTED TO ABORT THE TKOF. WE TURNED OFF AT THE NEXT TXWY AND STOPPED HDG S ON TXWY F TO LOOK AT THE POM AND FIGURE OUT OUR NEXT MOVE. THE POM DIRECTED US TO SELECT THE R GENERATOR SWITCH TO 'OFF;' AND; IF ON THE GND; THAT 'MAINT ACTION WAS REQUIRED.' I DECIDED TO NOT ALLOW ANOTHER MCO FOR AN INOP GENERATOR EVEN THOUGH THAT IS WHAT MAINT WANTED US TO DO. I FELT THEY NEEDED TO REALLY FIND AND FIX THE PROB.