EE WAS PROCEEDING DOWN THE STEPS HEADING TOWARD THE BOTTOM OF #3 COOLING TUNNEL. EE SLIPPED OPN THE STEPS AND LANDED ON HIS BACK. THE STEPS ARE CONCRETE STEPS. EE TAKEN TO HOSPITAL, TREAT AND RELEASED, RETURNED TO WORK ON RESTRICTED DUTY FOR TWO DAYS. RETURNED TO DOCTOR AND BEGINS LOST TIME 01-19-2001.