Abstract: ON 2-23-84 AT 1:00 PM., 8 BETHLEHEM STEEL EMPLOYEES WERE INVOLVED IN A RELINING OPERATION OF THE NUMBER ONE TAP RUNNER IN THE NUMBER CASTHOUSE LOCATED AT THE BASE OF "L" BLAST FURNACE. THE RUNNER WHICH THE EMPLOYEES WERE RELINING IS USED TO REMOVE THE MOLTON METAL FROM THE FURNACE. THE EMPLOYEES WERE USING A MATERIAL KNOWN AS RAMFRAX NC-25 HM TO FORM THE RUNNER WHICH IS FORMED AROUND PREMOLDED FORMS WHICH ARE PLACED IN THE RUNNER PRIOR TO THE RELINING OPERATION. AT THE TIME OF THE ACCIDENT THE EMPLOYEES WERE WAITING FOR ANOTHER BATCH OF MATERIAL TO BE MIXED IN A CEMENT MIXER WHICH WAS ON SITE. TWO OF THE THREE EMPLOYEES WHO WERE INJURED WERE STANDING AT THE END OF THE RUNNER WHERE THE EXPLOSION OCCURRED. THE 3RD EMPLOYEE WAS WALKING AWAY FROM THE AREA. EMPLOYEES RECEIVED CONCUSSIONS AND MULTIPLE INJURIES AS A RESULT OF THE EXPLOSION. TWO OF THE THREE EMPLOYEES THAT WERE INJURED DIED AS A RESULT OF THEIR INJURIES. THE MATERIAL THAT THE EMPLOYEES WERE USING HAD ONLY BEEN IN USE A SHORT PERIOD OF TIME AND THE MATERIAL WAS BEING CHECKED TO SEE IF IT COULD BE USED IN THE RELINING OPERATION ON A PERMANENT BASIS. THE EMPLOYEES HAD MIXED AND POURED 15 TONS OF MATERIAL TO FORM THE SIDES OF THE 36" LONG X 60" WIDE X 48" DEEP RUNNER. THE RUNNER HAD BEEN ALLOWED TO COOL A PERIOD OF 24 HOURS BEFORE THE RELINING OPERATION WAS BEGUN.