B777-200
Air Traffic Control Fully Certified
Confusion
ATC Issue All Types; Conflict Ground Conflict; Critical
Air Traffic Control Issued New Clearance
Human Factors
During very busy Ground Control; with a configuration change; Air Carrier X was cleared around the West end hold short of B. When Air Carrier Y was crossing runway at Q; Air Carrier X pulled forward to B on Z blocking the exit for Air Carrier Y. I gave instructions to Air Carrier X to turn onto B and Air Carrier Y joins B behind the B757. Air Carrier Y did not clear the runway RSA soon enough; and Air Carrier Z had to be sent around. Air Carrier X [should] have turned onto B1 as instructed/read back.
Ground Controller described a go-around event caused by ground traffic blocking an exit from the landing runway.