ENABLE GAS TRANSMISSION, LLC

Incident Narrative

ON 5/24/2022 AT APPROXIMATELY 3:30AM, THE COMPANY WAS NOTIFIED BY A PRODUCER OF A LOW PRESSURE FROM AN INPUT TIED TO OT-13. ASSUMING THERE WAS A LEAK, PERSONNEL WERE DISPATCHED BY MANAGEMENT TO ISOLATE THE LINE AND LOCATE ANY POSSIBLE ISSUES. THREE VALVES AND A CHECK VALVE WERE UTILIZED TO ISOLATE THE SECTION WITH THE FINAL VALVE BEING CLOSED AT 6:30AM. AT 7:30AM A RUPTURE WAS FOUND IN A RURAL AREA APPROXIMATELY 1350FT SOUTH OF BEAR CREEK LOOP RD. NEAR BONANZA, ARKANSAS. INTERNAL INCIDENT COMMUNICATIONS WERE MADE, AND THE EVENT WAS DETERMINED TO BE NON-REPORTABLE DUE TO ESTIMATES MADE BY MANAGEMENT AND ENGINEERING SUPPORT FOR THE COST OF REPAIR/CLEAN-UP AND RELEASE VOLUME. AN ENVIRONMENTAL CLEAN-UP CONTRACTOR WAS DISPATCHED TO THE SITE AND ASSESSED ACCESS TO THE LOCATION, TERRAIN, AND THE TIMELINE FOR THE CLEAN-UP. COST ESTIMATES BASED ON PRIOR COMPANY EXPERIENCE REQUIRED SUBSTANTIAL ADJUSTMENTS AFTER INPUT FROM CONTRACTOR. UPON RECEIVING THE UPDATED INFORMATION, IT WAS DETERMINED THAT THE COST OF REPAIR/CLEAN-UP WOULD EXCEED $122K AND AN IMMEDIATE REPORT WAS MADE TO THE NRC ON 5/25 AT 10:56AM. A 44.5IN SECTION OF PIPE WAS EJECTED DUE TO THE RUPTURE AND THE DAMAGED PIECE WAS COLLECTED AND SENT TO THE LAB FOR FAILURE ANALYSIS ON 5/28. THE LAB HAS ESTIMATED THAT THE FAILURE ANALYSIS REPORT WILL BE COMPLETED BY THE WEEK OF 6/27. THE RUPTURE WAS REMEDIATED BY REPLACEMENT ON 5/26 AND RETURNED TO PARTIAL SERVICE ON 5/27 AT 3:30PM. OT-13 WILL REMAIN AT (200PSI) TO SUPPORT A LOCAL DISTRIBUTION COMPANY (16-20 CUSTOMERS) WITH A RETURN TO NORMAL OPERATING PRESSURE PENDING THE OUTCOME OF FAILURE ANALYSIS AND ADDITIONAL INTEGRITY ASSESSMENT ACTIONS. SUPPLEMENTAL: LAB RESULTS FROM THE INITIAL FAILURE WERE RECEIVED ON 7/18 AND CONCLUDED THE RUPTURED OCCURRED DUE TO EXTERNAL CORROSION. OPERATIONS MANAGEMENT DECIDED TO PRESSURE TEST OT-13 AND MODIFY TO MAKE THE LINE PIGGABLE. DURING A PRESSURE TEST ON 8/23, A SECTION OF THE LINE FAILED AT (35.174671, -94.388078), APPROXIMATELY 3.2 MILES SOUTH OF THE INITIAL FAILURE. AFTER REPAIRS WERE MADE, A SUCCESSFUL PRESSURE TEST WAS COMPLETED ON 9/14. OT-13 WAS RETURNED TO NORMAL OPERATION AT 750PSI ON 9/30. LAB RESULTS FROM THE PRESSURE TEST FAILURE WERE RECEIVED ON 11/11 AND CONCLUDED THAT THE RUPTURE OCCURRED DUE TO EXTERNAL CORROSION.