TEXAS EASTERN TRANSMISSION, LP (SPECTRA ENERGY PARTNERS, LP)

Incident Narrative

ORIGINAL REPORT: 48 HR NRC REPORT 1245382 AT APPROXIMATELY 8:02 PM EDT ON MAY 8, 2019, A NATURAL GAS RELEASE FROM THE EMERGENCY SHUTDOWN (ESD) SYSTEM OCCURRED AT THE DANVILLE COMPRESSOR STATION ON THE TEXAS EASTERN TRANSMISSION (TETLP) IN LINCOLN COUNTY, KENTUCKY. TETLP PERSONNEL ARRIVED ON SITE AT APPROXIMATELY 8:35 PM EDT AND DETERMINED THAT A VALVE (LINE 10 ESD ISOLATION VALVE) DID NOT CLOSE PROPERLY CAUSING THE GAS RELEASE AFTER THE ESD SYSTEM WAS ACTIVATED. THE TETLP PERSONNEL SUBSEQUENTLY ISOLATED THE ESD SYSTEM AT APPROXIMATELY 8:43 PM EDT, STOPPING THE GAS RELEASE. THE STATION WAS RETURNED TO NORMAL OPERATIONS ON MAY 10, 2019. THE APPARENT CAUSE IS STILL UNDER INVESTIGATION. SUPPLEMENTAL REPORT: TETLP HAS COMPLETED ITS INVESTIGATION OF THE MAY 8, 2019 ESD EVENT AT DANVILLE COMPRESSOR STATION. THE EMERGENCY SHUTDOWN (ESD) SYSTEM ACTIVATION WAS CAUSED BY A TRIP IN THE BREAKER SUPPLYING ELECTRICITY TO THE ESD PANEL RESULTING FROM A SHORT IN THE WIRING THAT RUNS FROM THE ESD PANEL TO AN ESD PULL-BUTTON. THE ESD SYSTEM ACTIVATED, BUT ONE OF THE ESD BLOCK VALVES, VALVE# 10-296, DID NOT CLOSE AS INTENDED. THE BLOCK VALVE HAD BEEN DEACTIVATED DURING THE ROUTINE TESTING AND INSPECTION OF THE ESD AS REQUIRED BY COMPANY PROCEDURES, HOWEVER, THE BLOCK VALVE WAS NOT REACTIVATED AFTER THE ROUTINE TESTING AND INSPECTION HAD BEEN COMPLETED.