HARDEE POWER PARTNERS LTD

Incident Narrative

ON 8/7/2018 AT APPROXIMATELY 12:00 NOON, HARDEE POWER PARTNERS (HPP) DISCOVERED AN ELECTRONIC INSTRUMENT TRANSDUCER ON FIRE (INCIDENT) IN THE HPP PORTION OF GAS YARD 320 ON REGULATING RUN #2. THE AREA WAS SECURED AND THE SMALL FIRE EXTINGUISHED WHEN THE GAS SUPPLY TO THE INSTRUMENT TREE WAS ISOLATED. THE GAS YARD SERVES TO BACK UP HPP'S MAIN GAS SUPPLIER AND WAS NOT DISPATCHED AT THE TIME OF INCIDENT; HOWEVER, BECAUSE OF THE FAILED TRANSDUCER, THE STATION WAS FLOWING GAS FOR CONSUMPTION IN THE POWER PLANT. IT WAS THIS FLOW INDICATION THAT WAS NOTICED BY THE HPP CONTROL ROOM OPERATOR SHORTLY BEFORE NOON THAT BEGAN THE INVESTIGATION THAT LED TO THE DISCOVERY OF THE TRANSDUCER FAILURE. DUE TO THE TRANSDUCER FAILURE, THE HPP FLOW COMPUTER AT 320 WAS NOT ABLE TO CONTROL THE FLOW VALVE; AS A RESULT, THE LOCAL BECKER PNEUMATIC PILOT REGULATOR WAS CONTROLLING THE FLOW VALVE, BY DESIGN, IN PRESSURE CONTROL AND ENSURED THAT FROM THE TIME OF FAILURE UNTIL THE TIME THAT THE SYSTEM WAS ISOLATED BY HPP, THE DISCHARGE PRESSURE OF THE REGULATING STATION WAS CONTROLLED TO THE BECKER PILOT REGULATOR SETPOINT. FOLLOWING THE INCIDENT, THE STATION WAS VERIFIED CLEARED FOR SERVICE ON RUN#1 AND MADE AVAILABLE 08/14/18 FOR RUN 1 OPERATION. THE CAUSE OF THE INCIDENT (IGNITION OF THE TRANSDUCER NORMAL BLEED OFF) HAS BEEN INVESTIGATED BY HPP, HOWEVER NO IGNITION SOURCE PATH, NO DEFICIENCIES IN ISOLATION NOR DEFICIENCIES IN GROUNDING WERE DISCOVERED TO EXPLAIN THE IGNITION PATH. HPP IS SELF REPORTING THIS INCIDENT.