TRANSCONTINENTAL GAS PIPE LINE COMPANY

Incident Narrative

12/7/23 1:00PM RECEIVED A CALL OF BUBBLES SPOTTED 1:29PM NOTIFIED WITT O'BREINS 2:55PM SS 72 WAS SHUT-IN AND LOCKED OUT. 3:46PM LINE AT SS 28C WAS ISOLATED AND LOCKED OUT PRESSURE 625 PSI. 12/8/23 7:35AM - WAITING ON WEATHER FOR HELICOPTER TO FLY. 9:50AM COMPLETED FLYOVER, BUBBLES LOOK SAME IN SIZE. 10:05AM STARTED BLOWDOWN OF PIPELINE SEGMENT. 3:00PM VALVE CLOSED PRESSURE ON THE LINE 467 PSI. 3:49PM COMPLETED OVER FLIGHT NO BUBBLES OR SHEEN FOUND. 12/9/23 8:53AM COMPLETED OVER FLIGHT NO BUBBLED OR SHEEN FOUND. PRESSURE ON LINE 480 PSI. MADE NOTIFICATIONS. REACHED OUT TO MULTIPLE CONTRACTORS, BUT NO DIVE VESSEL AVAILABLE. LINE REMAINS ISOLATED AND LOCKED OUT UNTIL A VESSEL CAN PROCURED TO INVESTIGATE BUBBLES. 12/12/23 8:45AM DSV ARRIVES ON SITE. NO BUBBLES WERE LOCATED AT COORDINATES. 4:56PM CHECK VALVE VERIFIED CLOSED BY DIVER. 12/13/23 11:42AM - COMPLETED FLYOVER WITH NO BUBBLES OR SHEEN FOUND. 11:53AM . MADE NOTIFICATIONS TO ALL PARTIES. 7:19PM DSV DEPARTED FOR THE DOCK. VERIFIED BEFORE DEPARTURE THAT THERE ARE NO BUBBLES LOCATED AT COORDINATES. 12/20/23 4:13AM DSV ON SITE AND DIVER IS ABOUT TO JUMP TO LOCATE LINE. CURRENTLY THERE ARE NO BUBBLES/SHEEN LOCATED. 12:58PM WE WERE NOTIFIED THAT THE DSV HAS POPPED AN ANCHOR CABLE AND WILL NEED TO RETURN TO THE DOCK FOR REPAIRS. THEY CHECKED THE COORDINATES WITH SONAR BEFORE HEADING IN AND NO BUBBLES/SHEEN WERE LOCATED. 12/18/23 15:51 THIRD PARTY LOCATED BUBBLES AGAIN AND CALLED THE NRC (REPORT # 1387032) 12/26/23 11:59PM DSV DEPARTED FROM THE DOCK HEADED TO THE COORDINATES OF THE BUBBLES. 12/27/23 8:10AM DSV ON SITE. 9:50AM DSV HAS DROPPED ANCHORS AND IS IN POSITION. 10:29AM BUBBLES LOCATED. SMALL CHAMPAGNE BUBBLES WERE DISCOVERED USING MESOTECH. 12:09PM JUMPED DIVER TO BEGIN JETTING. 1:45 PM CONFIRMED TO BE OUR PIPELINE. NOTIFIED ALL PERSONNEL THAT IS OUR LINE. 2:45PM 2ND DIVER CONFIRMS THE LEAK LOCATIONS ARE ON THE WELD SEEM. DIVERS WILL BEGIN TO REMOVE CONCRETE COATING. 7:08PM CONCRETE HAS BEEN REMOVED FROM 20' IN BOTH DIRECTIONS FROM THE LEAK 8:22PM BUFFING COMPLETE. 9:30PM UT PIPE 11:39PM CLAMP INSTALLED, WILL BEGIN TO PRESSURE UP AND TEST FOR LEAKS. 12/28/23 2:17AM PRESSURE TEST COMPLETED AND STILL NO LEAKS. MADE NOTIFICATIONS THAT THE CLAMP WAS INSTALLED. RETURNED PIPELINE TO SERVICE. 6:20AM DSV HEADED TO THE DOCK. JOB COMPLETED.