LCL CTLR RPTR DID NOT FOLLOW FACILITY POLICY REGARDING FLT PROGRESS STRIP MARKING WHICH RESULTED IN LOSS OF SEPARATION BTWN 2 IFR ACFT.

Narrative

ACFT X WAS RECLRED (CLRED FOR TKOF) ON A 090 DEG HDG AND SHIPPED TO DEP. ACCORDING TO CURRENT SOPS; I SHOULD HAVE PUT A CIRCLE AROUND THE ASSIGNED HDG WRITTEN ON THE STRIP TO PREVENT DEP FROM TURNING THE ACFT BACK TOWARDS THE RWY CONFIGN. ACR Y WAS SUBSEQUENTLY RELEASED TO FLY THE BNA 8 SID WHICH HAS HIM JOIN THE BNA 068 DEG RADIAL; AND SWITCHED TO DEP. OLD SOPS DIDN'T ALLOW YOU; AS DEP; TO TURN BACK TOWARDS THE RWY CONFIGN NOR DID IT REQUIRE THE LCL CTLR TO CIRCLE THE HDG TO PREVENT DEP FROM DOING SO. BEFORE I SWITCHED ACR Y TO DEP; THE DEP CTLR HAD APPROVED ACFT X'S REQUEST FOR A L TURN ON COURSE; PLACING HIM IN ACR Y'S PROJECTED FLT PATH. COMPOUNDING THE PROB; ACR Y FAILS TO CHK ON IN A TIMELY MANNER. I SAW THE SIT DEVELOPING AND CALLED DEP TO MAKE SURE HE WAS TALKING TO BOTH ACFT. HE ADVISED HE WAS NOT TALKING TO ACR Y AND WE BOTH; SIMULTANEOUSLY; ATTEMPTED TO CONTACT ACR Y; AT WHICH TIME HE ANSWERS THE DEP CTLR. SEPARATION HAD ALREADY BEEN LOST; BUT IMMEDIATE; EVASIVE VECTORS WERE ISSUED AND THE ACFT CONTINUED ON THEIR WAY. THE PLT OF ACR Y SAID TCASII NEVER INDICATED THE PRESENCE OF ACFT X NOR DID HE EVER SEE HIM. A REVIEW OF CURRENT SOPS IS UNDERWAY; QUESTIONING THE NEED/AUTH OF DEP TO TURN ACFT BACK TOWARDS A RWY CONFIGN.