CONOCOPHILLIPS ALASKA, INC.

Incident Narrative

ON 3/22/2024 AT APPROXIMATELY 15:00 HRS A DUMP TRUCK LEFT THE DRIVING SURFACE OF THE SEASONAL ICE ROAD PARALLELING THE ALPINE ARCTIC HEATING FUEL PIPELINE (AHFP) RIGHT-OF-WAY, STRIKING THE AHFP AND VERTICAL SUPPORT MEMBER (VSM)1830, DAMAGING BOTH. NO FLUID LEAKED FROM THE DAMAGED PIPELINE AT THAT TIME. THE ACCIDENT WAS IMMEDIATELY REPORTED TO THE OPERATOR'S SECURITY DISPATCH WHO NOTIFIED THE PIPELINE CONTROLLER OF THE STRIKE, DISPATCHED THE CONTRACT OSROW, ALASKA CLEAN SEAS (ACS), TO THE SCENE AND NOTIFIED THE QUALIFIED INDIVIDUAL. THE PIPELINE CONTROLLER SHUT DOWN THE AHFP AND MONITORED CONDITIONS. SCADA AND LEAK DETECTION SYSTEM INFORMATION SHOWED NO INDICATIONS OF A LEAK. ACS PERSONNEL ARRIVED AT THE SCENE AND FOUND FLUID HAD LEAKED FROM THE TRUCK, BUT NONE HAD LEAKED FROM THE PIPELINE. THEY CLEANED UP THE FLUIDS FROM THE TRUCK AND PLACED A PORTABLE SECONDARY CONTAINMENT UNIT UNDER THE DAMAGED SECTION OF THE AHFP AND INSPECTED IT FOR FLUID DAILY. ON 3/24/2024 AT APPROXIMATELY 08:00 HRS, TWO CUPS OF DIESEL WERE DISCOVERED TO HAVE DRIPPED FROM THE AHFP INTO THE SECONDARY CONTAINMENT. THE FLUID WAS REMOVED AND DISPOSED OF AND THE LEAK WAS PLUGGED AND WRAPPED PREVENTING FURTHER LEAKAGE. REGULATORY COMPLIANCE PERSONNEL REPORTED THE LEAK TO THE NRC AT 08:45 AND PROVIDED A 48-HOUR UPDATE ON 3/26/2024. THE DAMAGED SECTION OF THE AHFP WAS DRAINED, REMOVED, AND REPLACED WITH IDENTICAL NEW PIPE. THE FULLY REPAIRED AHFP WAS SUCCESSFULLY PRESSURE TESTED 4/14/2024 AT 07:30 HRS AND PLACED BACK INTO SERVICE 4/14/2024 AT 22:00 HRS.