B777 FLT CREW DURING DEP FROM RJAA ON THE REVERSAL 8 DEP HAS UNCOMMANDED R TURN NOT ASSOCIATED WITH THE DEP. FLT CREW ATTEMPTS TO RETURN TO THE PUBLISHED DEP; THE CTLR INTERVENES AND GIVES A NEW CLRNC.

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SHORTLY AFTER LIFTOFF FROM RWY 34R ON THE REVERSAL 8 DEP; LNAV ENGAGED AND COMMANDED A R TURN. THIS WAS A 20 DEG FLAP TKOF; THE OPERATING EXPERIENCE FO WAS FLYING; AND I WAS CLOSELY MONITORING THE AIRSPD. AS HE STARTED INTO THE R TURN; I SAID 'THIS IS TOO EARLY TO START THE TURN;' SELECTED HDG AND DIALED 330 DEGS TO CORRECT BACK TO COURSE. AS I EXPANDED MY MAP DISPLAY TO CONFIRM THE CORRECT RWY AND SID; AS WE HAD BOTH PREVIOUSLY DONE DURING PREFLT AND TAXI-OUT CHKLISTS; I VERIFIED RWY 34R; HOWEVER; THE LNAV DISPLAY WAS THE ROUTING FOR RWY 16L. DEP CTL THEN CALLED TO SAY 'COMPLY WITH THE REVERSAL 8 DEP.' I RESPONDED WITH 'WE ARE; AND CORRECTING BACK TO COURSE.' SHE THEN ASKED FOR OUR HDG; WHICH I GAVE 330 DEGS. AT THAT POINT SHE GAVE A 090 DEG HDG. I ESTIMATE OUR POS APPROX 1 NM R OF CTRLINE. AS WE CONTINUED THE CLBOUT WITH HDG VECTORS; WE WERE QUERIED IF WE HAD TURNED SHORTLY AFTER TKOF AND WHY; AND I RESPONDED THAT WE HAD AND WERE EXPERIENCING A NAVAID MALFUNCTION. WHEN WE WERE ABOVE FL180; I RECONSTRUCTED THE INITIAL PORTION OF THE RTE WITH RWY 34R AND THE REVERSAL 8 DEP IN RTE 2 OF THE FMC; AND IT APPEARED NORMAL. SUPPLEMENTAL INFO FROM ACN 686226: THIS EVENT OCCURRED AT NIGHT. PREDEP SET-UP INCLUDED FMC PROGRAMMING OF NARITA REVERSAL 8 DEP; WITH RWY 34R. THE CAPT LOADED THE RTE AND DEP; AND THIS WAS INDEPENDENTLY VERIFIED BY MYSELF; TO INCLUDE THE ALT RESTRS ON THE DEP OF 7000 FT AT D21 FROM SNE. THIS ALT WAS THEN SET IN THE MCP ALT WINDOW AS A RESTR. AS THE FMC RTE PAGE DOES NOT INCLUDE THE HAKONE TRANSITION; THE FIXES WERE CHKED ON THE LEGS PAGE. VISUAL CONFIRMATION OF THE NAV DISPLAY WAS ALSO MADE THAT CONFIRMED DEP TRACK. WE RECEIVED DEP CLRNC WHICH CONFIRMED SAME DEP AND RWY. THE DEP WAS BRIEFED TO INCLUDE AN LNAV DEP FROM RWY 34R. DURING TAXI; WHILE PERFORMING THE BEFORE TKOF CHKLIST; I VISUALLY CONFIRMED RWY 34R WAS DISPLAYED ON THE NAV DISPLAY.