SJC LCL CTLR RPTS OBSERVING AN OPERROR BY NCT AND INITIATES ACTION TO INCREASE SEPARATION.

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HAD JUST CHANGED TO RWY 30 OP FROM RWY 12. MD83; 9 MI FINAL HDOF ACCEPTED NOT IN RADIO COM. ADJACENT ARPT (RHV); 5 NM E; CALLED FOR APPROVAL OF IFR BE35 FROM RWY 13. INITIAL CLRNC FOR THIS DEP IS TURN R HDG 290 DEGS; VECTORS FOR SJC VOR. THIS WILL IMMEDIATELY CONFLICT WITH MD83. I ASK WHERE THE ACFT IS; KNOWING THAT THIS WILL NOT PROVIDE SEPARATION. RHV ADVISES BE35 IS ROLLING. I CALL FINAL APCH CTL SECTOR; THEY DO NOT ANSWER. DEP SECTOR ANSWERS FOR FINAL AND I ASK WHAT THEY ARE DOING WITH MD83. RHV HAS JUST LAUNCHED BE35 FROM RWY 13 INTO PATH OF MD83. DEP CTLR BELIEVED RHV WAS ON RWY 31; HAD RELEASED BE35 ON THAT ASSUMPTION. MD83 MAKES RADIO CONTACT; I ASK APCH; 'WHAT DO YOU WANT ME TO DO WITH MD83;' NO ANSWER AFTER SEVERAL SECONDS; I ADVISE THAT I AM CLBING MD83 AND ISSUE THE FOLLOWING: CANCEL APCH CLRNC AND ISSUE CLB TO 3000 FT TO MD83. ISSUE BE35 AS TFC TO MD83. ISSUE L TURN HDG 270 DEGS AS MD83 REACHES 2000 FT MINIMUM VECTORING ALT (MVA) IN THAT AREA. BE35 CONTINUED R TURN TO APPROX HDG 300 DEGS. PARALLELING MD83 UNTIL HDG ISSUED TO MD83. BE35 EVENTUALLY TURNED N; AFTER MD83 BEGAN TURN TO 270 DEG HDG. CLOSEST POINT OF APCH BTWN MD83 AND BE35 WAS LESS THAN 1 MI; SAME ALT. I WAS UNABLE TO PROVIDE VISUAL SEPARATION; BE35 WAS NEVER IN SIGHT. CTLR IN CHARGE WAS ALERTED TO THIS SIT AS IT DEVELOPED; SUPVR AT APCH CTL WAS ADVISED OF POSSIBLE OPERROR. LCL SUPVR ADVISED UPON ARR.