EMPLOYEE WAS WASHING TAIL PULLEY OFF AT WASH PLANT #2. AFTER FINISHING, EMPLOYEE STARTED TO CLIMB UP ONTO THE LOADER HE WAS OPERATING. ON RHW ASECOND STEP UP, THE EMPLOYEES FOOT SLIPPED OFF CA USING THE EMPLOYEE TO FALL BACKWARDS. IN THE PROCESS OF FALLING, THE EMPLOYEE LANDED ON HIS LEFT WRIST AND SPRAINED IT.