An MD80 had a catastrophic right engine failure climbing through 12;000 FT. An emergency was declared; the Engine Fire Severe Damage Checklist was completed and the aircraft returned to the departure airport uneventfully.

Narrative

Normal reduced power takeoff and climb. Cleared to 17;000 FT. Climb checks completed through 10;000 FT. Approximately 12;500 FT LOUD bang and slight aircraft yaw. Right Engine indications show complete loss of power and EGT at 800 degrees. Captain called for Eng Fire/Damage/Separation Checklist while flying and completing the Memory Items. We decided severe damage was indicated so I pulled the right engine fire handle and discharged 1 bottle. No fire indication was seen so only 1 bottle was discharged. The EGT still showed 800 degrees. The fuel lever being shut off immediately reduced the EGT. We continued through the checklist; declared an emergency and took vectors back to our departure airport. Landed smoothly at approx 144;000 LBS and communicated with Airport Rescue and Fire Fighting. Note: Airport Rescue and Fire Fighting radio was impossible to copy due to loud squeal. Eventually with help from ATC Airport Rescue and Fire Fighting told us that there was no fire so we opted to taxi to a gate.