EMPLOYEE WAS DESCENDING STAIRS FROM PREP PLANT C&L LEVEL TO 5TH LEVEL. THE STAIRS WERE WET, BOTH FEET SLIPPED FROM UNDER HIM AND WHEN HE FELL THE WEIGHT OF HIS BODY PULLED ON HIS RIGHT ARM HE HAD HOLD OF THE HANDRAIL WITH HIS RIGHT HAND AND THE WEIGHT OF HIS BODY PULLED HIS RIGHT ARM OUT OF THE SOCKET, DISLOCATING HIS RIGHT SHOULDER.