TPA APCH CTLR EXPRESSED CONCERN REGARDING THE NEW RNAV PROCS; CITING EVENTS INVOLVING ACR'S MAKING WRONG TURNS; JEOPARDIZING SAFETY.

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FOR THE PAST 2 DAYS; THERE HAVE BEEN 2 INCIDENTS INVOLVING AN ACR ON A NEWLY IMPLEMENTED RNAV DEP MAKING A WRONG TURN AFTER DEP. IN BOTH INSTANCES; THE ACR MADE A R TURN INSTEAD OF STRAIGHT OUT; AND CLBING TO 6000 FT. IN THE FIRST INSTANCE; I WAS WORKING DEP AND NOTICED THE ACR MAKING A WRONG TURN; AND IMMEDIATELY TURNED THE ACFT AND COORDINATED WITH ADJACENT SECTORS TO TURN THEIR ARR TFC; AND THE TWR TO STOP DEPS. AFTER I WAS RELIEVED FROM POS. IN THE SECOND INSTANCE; I WAS WORKING CAB COORDINATOR IN THE TWR WHEN THE SECOND ACFT STARTED TO MAKE A R TURN INTO TFC WHO HAD JUST DEPARTED AHEAD OF HIM. THE LCL CTLR NOTICED THIS; AND TURNED THE ACR AWAY FROM TFC TO THE NW; COORDINATED WITH DEP CTL; AND SWITCHED THE ACR TO DEP. THE UNION HAS FILED NUMEROUS (OVER 100) UCR'S TO HAVE THESE RNAV DEPS TERMINATED; OR AT LEAST REDONE TO CORRECT THEIR PROBS. I PERSONALLY BELIEVE THE RNAV DEPS SHOULD BE TERMINATED IN THE INTEREST OF SAFETY. THE FAA SEEMS TO BE FORCING THESE DEPS ON TO THE CTLRS AT THE EXPENSE OF SAFETY.