B787-800
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Aircraft Equipment Problem Less Severe
General Release Refused / Aircraft Not Accepted
Aircraft
Just before pushback; we got a L Pack Inop [message].  The ground personnel on the headset said there was a loud bang and debris exited the aircraft.  Maintenance brought a piece of the fan blade to the cockpit he found on the ramp.  I discussed with Dispatch and Tech the possibility of flying this aircraft back to ZZZ; single pack under MEL.  As a restricted Captain and this was my maiden voyage on [the] North Atlantic after OE (Operating Experience); I told them I wasn't comfortable taking the aircraft in it's current state.  They both said they agreed with my decision. Realizing my limitations being brand new on the airplane and making a decision as to what would be the safest course of action. I don't know how this could be avoided.
Air carrier Flight Crew flying 787-800 aircraft refused aircraft after Pack failure.