ENABLE GAS TRANSMISSION, LLC — Gas transmission and gathering — incident on 2015-12-28

Gas transmission and gathering incident in Not Within a Municipality, CRAWFORD County, AR. Reported cause: NATURAL FORCE DAMAGE. Reported consequences: 0 fatalities, 0 injuries, 46086 NATURAL GAS released, $500,000 reported property damage. Operator-reported incident data submitted to PHMSA, generally within 30 days. Records may be supplemented or corrected and do not represent final agency causal findings.

Report number: 20160011.

Operator ID: 602.

Reported incident date: 12/28/2015 5:55.

Location detail: 2108+60

Cause detail: HEAVY RAINS/FLOODS

Cause detail: ON DECEMBER 28, 2015 AT 05:55 HRS. SCADA INDICATED THAT A LEAK WAS OCCURRING ON ENABLE GAS TRANSMISSIONS OM-1 PIPELINE. THE ENABLE CONTROLLER INITIATED THE EMERGENCY PLAN AND NOTIFIED FIELD PERSONNEL TO RESPONSE TO KEY LOCATIONS TO CLOSE MAINLINE VALVES. MAINLINE VALVE WERE CLOSED AT 07:11 HOURS TO ISOLATE THE LEAK. NOTE: AFTER VALIDATING THIS EVENT ENABLE ATTEMPTED TO CONTACT NRC TO REPORT IT FOUR TIMES . THERE WAS NO ANSWER AND OPTION TO LEAVE A MESSAGE. NRC CONTACT WAS MADE LATER IN THE DAY AT 2PM. FOLLOWING THE INCIDENT ENABLE TOOK THE FOLLOWING ACTIONS: 1. IMPLEMENTED EARTH MOVEMENT P&M MEASURES REQUIRING QUARTERLY LINE PATROLS AND ADDITIONAL LINE PATROLS TRIGGERED BY SIGNIFICANT RAINFALL EVENTS OR EARTHQUAKES IN THE AREA. 2. COMPARED 2008 ILI DATA TO 2015 ILI DATA TO SEE IF THERE WAS ANY INDICATIONS THAT RIPPLES HAD GROWN. NO GROWTH NOTED. 3. REVIEWED ILI DATA LOOKING SPECIFICALLY FOR RIPPLE INDICATIONS. 4. THE ILI VENDOR DID NOT REPORT ANY RIPPLES DUE TO THEIR SMALL SIZE. THEY WERE NOT DETECTED BY HR DEFORMATION TOOL. 5. ENABLE ILI ANALYSTS REVIEWED THE RAW DATA AND WERE ABLE TO IDENTIFY SOME MINOR RIPPLES. 6. COMPARED RIPPLE LOCATIONS TO TERRAIN & ELEVATION CHANGES. 7. OVERLAID RIPPLE LOCATIONS OVER TOPOGRAPHICAL PROFILE & HAD SES SOILS EXPERT EVALUATE RESULTS. 8. SES SOILS EXPERT PERFORMED A FIELD VISIT TO SPECIFICALLY LOOK FOR EARTH MOVEMENT AND SOIL STABILITY IN VICINITY OF RIPPLES 9. UPDATED P&M MEASURES BASED ON SES SOILS EXPERT INPUT 10. REMOVED 450 FEET OF PIPE IN AN AREA OF EARTH MOVEMENT DISCOVERED DURING LINE PATROL. 11. REMEDIATED AND STABILIZED THE EARTH MOVEMENT AREA. 12. SELECTED A JOINT OF PIPE WITH RIPPLES TO BE ANALYZED AND TESTED TO FAILURE BY SES. 13. SELECTED A JOINT OF PIPE WITH GIRTH WELD TO BE ANALYZED AND TESTED TO FAILURE BY SES. 14. PIPE JOINTS AT SES AND ANALYSIS COMPLETED. 15. NO ADDITIONAL ACTIONS WARRANTED AT THIS TIME.

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: NATURAL FORCE DAMAGE — HEAVY RAINS/FLOODS.

PHMSA indexed costs: $619,366 reported total cost, $361,087.591 in 1984 dollars, $753,720.362 in current-year dollars.

PHMSA trend flags, standardized causes, and indexed costs are analytical fields added to operator-reported incident data. They do not represent final agency causal findings.