SEA ROBIN PIPELINE CO

Incident Narrative

AT APPROXIMATELY 1145 HRS. ON THE MORNING OF 9/26/2021, SEA ROBIN GAS CONTROL WAS NOTIFIED BY EI 331 RENAISSANCE PERSONNEL OF BUBBLES AND SHEEN SPOTTED IN THE EI 330 BLOCK AREA. CALL WAS MADE TO RENAISSANCE EI 331 PLATFORM TO GET SPECIFICS AND COORDINATES OF THE LEAK SITE. A CALL WAS MADE TO THE NRC AT 1213 HRS. TO REPORT THE LEAK, AT WHICH TIME THE EMPLOYEE WAS INFORMED BY THE NRC ON DUTY OFFICER THAT QUARTER NORTH ENERGY HAD ALSO REPORTED THE LEAK AND TOOK RESPONSIBILITY. QUARTER NORTH WAS ABLE TO SECURE THE TRITON EXPLORER DIVE VESSEL ON THE EVENING OF 9/26/21, TO HEAD TOWARDS THE LEAK LOCATION TO BEGIN A FORMAL INVESTIGATION. ONCE THE DIVE VESSEL REACHED ITS DESTINATION ON THE MORNING OF 9/27/21, IT BECAME APPARENT THAT THE ACTUAL LEAK SITE WAS ALSO IN THE VICINITY OF SEA ROBIN 12INCH SEGMENT #3787 AND SEA ROBIN 24INCH SEGMENT #15532. CALLS WERE MADE TO ALL PRODUCERS TIED INTO SEGMENT #3787 AND HAD THEM SHUT IN UNTIL FURTHER INVESTIGATION COULD BE COMPLETED. BY 1220 HRS. ON 9/27/21, ALL VALVES UPSTREAM AND DOWNSTREAM OF THE LEAK LOCATION WERE ISOLATED ON SEGMENT #3787. AFTER FURTHER INVESTIGATION BY THE DIVE VESSEL, THE LEAK WAS FOUND EMITTING FROM UNDER SEVERAL LAYERS OF 3/1 CEMENT BAGS AT THE 12INCH X 24INCH CROSSING. AT APPROXIMATELY 1600 HRS. ON 9/27/21, SEA ROBIN TOOK RESPONSIBILITY AWAY FROM QUARTER NORTH AND PICKED UP THE DIVE VESSEL TO EVALUATE THE LEAK WHICH WAS FOUND COMING FROM THE 12INCH SEGMENT #3787 AND MAKE NECESSARY REPAIRS. ARENA EI 338 PLATFORM ASSISTED AND BEGAN BLOWING DOWN SEGMENT #3787. AGAIN, A CALL WAS PLACED TO THE NRC AT 1635 HRS. ON 9/27/21 TO ACCEPT RESPONSIBILITY ON BEHALF OF SEA ROBIN PIPELINE AND PROVIDE UPDATE. WE RECEIVED CONTACT INFORMATION FROM AN OPERATOR WITH QUARTER NORTH ON THE BSEE REPRESENTATIVE HE HAD BEEN DEALING WITH. A CALL WAS PLACED WITH BSEE REPRESENTATIVE TO GIVE AN UPDATE AND ACCEPT RESPONSIBILITY ON BEHALF OF SEA ROBIN PIPELINE. CALLS WERE MADE WITH PHMSA FOR PERIODIC UPDATES. NO SHEENS WERE NOTED ON 9/28/21 AS THE DIVE VESSEL CONTINUED ITS SITE PREPARATION FOR REPAIRS. BY 1015 HRS. ON 9/28/21, THE PIPELINE PRESSURE WAS BLOWN DOWN TO 162 PSI AT THE REQUEST OF THE DIVE SUPERINTENDENT TO SAFELY WORK AROUND THE LEAK SITE. DIVE WORK CONTINUED THROUGHOUT THE DAY OF 9/29/21 WITH NO VISIBLE SHEEN. CALLED NRC AT 1535 HRS. ON 9/29/21 TO MAKE 48 HR. UPDATE. ALSO CALLED BSEE AND PHMSA TO GIVE UPDATES. AT APPROXIMATELY 0600 HRS. ON 9/30/21, THE REPAIR CLAMP WAS INSTALLED AND TORQUED. EI 338 PRODUCER BEGAN PRESSURIZATION OF PIPELINE TO PERFORM LEAK CHECKS AT MULTIPLE STAGES. NO LEAKS WERE OBSERVED BY THE DIVERS OR OVERFLIGHT PERSONNEL THROUGHOUT EACH INCREASE IN PRESSURE POINTS. BY 1635 HRS. ON 9/30/21, ALL VALVES WERE IN THE OPEN POSITION AND PIPELINE WAS RESTORED TO NORMAL OPERATIONS.