TRANSCONTINENTAL GAS PIPE LINE COMPANY

Incident Narrative

1-6-23 08:50 GAS CONTROL NOTIFIED OPERATIONS THAT A THIRD PARTY VESSEL REPORTED BUBBLES LOCATED IN THE SMI130 BLOCK 08:57 THIRD PARTY COMPANY WAS CONTACTED TO VERIFY WHAT WAS REPORTED TO PIPELINE CONTROL AND TO GET COORDINATES OF LEAK LOCATION. 09:05 OPERATIONS PLOTTED THE COORDINATES WHICH PUT THE BUBBLES WITHIN 500 TO 600 FOOT OF THE WILLIAMS 12 PIPELINE FROM SMI130A SMI130 UWTI ' 09:10 OPERATIONS CONTACTED WILLIAMS HELICOPTER AND TECHNICIANS TO FLY OVER TO VERIFY THERE ARE BUBBLES AND CONFIRM THE COORDINATES OF THE REPORTED LEAK ' 09:30 CONTACTED WILLIAMS SOC TO REPORT THE POSSIBLE LEAK ' 09:55 WILLIAMS REP CONTACTED WITH WIT O'BRIEN'S ' 10:19 WIT O'BRIENS MADE THE NRC, BSEE AND PHMSA NOTIFICATIONS ' 10:37 WIT O'BRIENS CONTACTED WILLIAMS REP TO VERIFY INFO FOR THE NRC REPORT ' 10:43 WILLIAMS TECHNICIAN CONFIRMED BUBBLES WERE PRESENT AND GAVE UPDATED COORDINATES AND THE PIPELINE WAS BEING ISOLATED AND LOTO ' 1045 PROCURED A 12' CLAMP FROM VENDOR ' 12:10 BLOWDOWN AT SMI106 BEGAN WITH 668PSI ' 15:30 BLOWDOWN WAS STOPPED AT 460PSI TO FLY OVER BUBBLES TO VERIFY IF LEAK STILL REMAINS ' 15:40 NO BUBBLES WERE PRESENT ACCORDING TO WILLIAMS TECHNICIAN ON FLY OVER ' 17:53 DIVE VESSEL WAS PROCURED 1-7-23 ' 22:00 DIVE VESSEL MOVED OUT TO LOCATION 1-8-23 ' 16:46 ETA OF DIVE VESSEL ' 16:46 DROPPED MESOTECH TO PINPOINT LEAK ' 22:30 ANCHOR SET COMPLETE 1-9-23 ' 02:00 DIVER JETTING TO FIND PIPELINE ' 09:00 VERIFIED IT IS 12' WILLIAMS PIPELINE ' 09:46 REMOVING CONCRETE COATING IN ORDER TO INSTALL 12' CLAMP ' 21:57 12' CLAMP WAS INSTALLED AND TORQUED 1-10-23 ' 09:17 WILLIAMS TECHNICIAN STARTED PRESSURING UP PIPELINE ' 09:18 DIVER ON BOTTOM CHECKING FOR LEAKS ON CLAMP ' 11:10 PIPELINE WAS PRESSURED BACK UP AND DIVERS REPORTED NO LEAKS ' 16:32 SYNTHO-GLASS WAS APPLIED TO AFFECTED AREA, 3N1 BAGS WERE INSTALL TO COVER LOCATION AND ANCHORS WERE RETRIEVED