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CONSUMERS ENERGY CO

gas_transmission Incident —

Incident Information

Report Date—
OperatorCONSUMERS ENERGY CO
Commodity—
Pipeline Typegas_transmission

Location

State
Coordinates42.80921, -82.86483

Cause

CauseINCORRECT OPERATION
Subcause—

Casualties

Fatalities0
Injuries0

Costs

Property Damage—
Lost Commodity—
Public/Private Damage—
Emergency Response—
Environmental Remediation—
Other Costs—

Location Map

Incident Narrative

ON AUGUST 10, 2016 AT APPROXIMATELY 22:43 CONSUMERS ENERGY RAY COMPRESSOR STATION EXPERIENCED AN EVENT WHEREBY POWER SUPPLIED BY THE UTILITY SUPPLIER WAS BELOW NORMAL LEVELS. THE CONTROL SYSTEM RECOGNIZED A UTILITY SOURCE PHASE SEQUENCE LOSS AS WELL AS A STATION UNINTERRUPTIBLE POWER SUPPLY (UPS) ALARM. AT APPROXIMATELY 22:44, THE COMMERCIAL UTILITY BREAKERS TRIPPED OPEN AND PLANT 3 EMERGENCY SYSTEM TRANSFERRED POWER FROM THE UTILITY OVER TO GENERATOR 3-00-01. THE SYSTEM ATTEMPTED TO TRANSFER POWER TO THE C2-7 GENERATOR SET FOR PLANTS 1 AND 2; HOWEVER, THE SYSTEM DID NOT START AND PLANTS 1, 2 AND THE CONTROL ROOM REMAINED ON UPS POWER. AT APPROXIMATELY 22:44, UTILITY POWER AT THE STATION WAS RESTORED TO ACCEPTABLE LEVELS ACROSS ALL THREE LEGS, AB, BC AND CA. PLANT 3 TRANSFERRED BACK TO UTILITY POWER, HOWEVER, PLANT 1, 2 AND THE CONTROL ROOM REMAINED ON UPS POWER. AT APPROXIMATELY 22:52, UNIT 2-7 INITIATED IT'S SHUTDOWN SEQUENCE DUE TO HIGH CRANKCASE OIL TEMPERATURE, HIGH JACKET WATER TEMPERATURE, LOW ENGINE LUBE OIL PRESSURE AND LOW TURBOCHARGER OIL PRESSURE ALARMS. AT APPROXIMATELY 23:32 THE 2-7 UPS WAS DEPLETED WHICH SUPPLIED POWER TO VENT VALVE GV-007. VENT VALVE GV-007 FAILED OPEN, AS DESIGNED IN THE EVENT OF A POWER LOSS, RESULTING IN A RELEASE OF NATURAL GAS INTO THE ATMOSPHERE. THE ON-CALL OPERATOR ARRIVED AT THE LOCATION ON AUGUST 11, 2016 AT APPROXIMATELY 00:06. AT APPROXIMATELY 00:14 THE ON-CALL OPERATOR REPORTED VENTING GAS AT THE THE SOUTHWEST CORNER OF THE PLANT, VALIDATED THE VENTING GAS WAS COMING FROM PLANT 2 AT APPROXIMATELY 00:20. AT APPROXIMATELY 00:28 A PLANT 2 FIREGATE OPERATION WAS INITIATED AND VENTING GAS WAS STOPPED AT APPROXIMATELY 00:33. THE ON-SITE TEAM BEGAN INVESTIGATING THE CAUSE OF THE VENT VALVE OPENING AND GATHERING DATA. IT WAS DETERMINED THAT GENERATOR 2-7 CONTROL PANEL WAS IN THE ""OFF"" POSITION. THE CONTROL PANEL IN THE ""OFF"" POSITION PREVENTS AUTOMATIC OPERATION OF THE UNIT. ON AUGUST 11, 2016 AFTER COMPLETING THE INVESTIGATION, PLANT 2 WAS PLACED BACK INTO SERVICE AT APPROXIMATELY 16:00.

About This Pipeline Incident

Pipeline incident data is reported to the Pipeline and Hazardous Materials Safety Administration (PHMSA). All significant incidents involving fatalities, injuries, or property damage over $50,000 must be reported.

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