CONSOLIDATED EDISON CO OF NEW YORK

Incident Narrative

ON TUESDAY SEPTEMBER 11, 2012 AT 09:05 LEAK SURVEY REPORTED TO THE GAS EMERGENCY RESPONSE CENTER A 15% GAS READING WAS DETECTED AT 4"" TRANSMISSION MAIN VALVE #12082 OPPOSITE 1218 NOBLE AVE, BRONX, NEW YORK. VALVE #12082 IS THE INLET VALVE TO TRANSMISSION-LOW PRESSURE REGULATOR STATION GR-191. A CODE MURRE (MULTIPLE RESOURCE RESPONSE EVENT) WAS INITIATED AND GAS CONSTRUCTION, PRESSURE CONTROL AND SUPERVISION WERE DISPATCHED. AT 12:45, CONTINGENCY CASE 13B WAS ACTIVATED AND ISOLATION VALVES WERE IDENTIFIED AND INSPECTED. A VACUUM TRUCK WAS ASSIGNED AND USED TO EXCAVATE AROUND THE VALVE. AT 16:18, IT WAS REPORTED A LEAK ON VALVE #12082 WAS CONFIRMED. GAS CONTROL WAS NOTIFIED AND PRESSURE CONTROL CLOSED REMOTE INLET V-6947 TO ISOLATE LEAKING V-12082. THE AFFECTED SEGMENT OF 4"" 245 PSI RATED PIPING WAS APPROXIMATELY 82' IN TOTAL AND WAS DEPRESSURIZED THROUGH GR-191. THERE WERE NO SYSTEM IMPACT OR CUSTOMER OUTAGES AS A RESULT OF GR-191 OUT OF SERVICE. AN OPERATIONAL PLAN WAS IDENTIFIED AND PROCEDURE MP-12-27 WAS DEVELOPED FOR THE REPLACEMENT OF THE LEAKING VALVE AND ASSOCIATED PIPING. ON FRIDAY SEPTEMBER 14, 2012 THE PROCEDURE WAS INITIATED AND NEW VALVE #59783 AND PIPING TOTALING 5'2"" WAS INSTALLED. PRESSURE CONTROL RETURNED GR-191 TO SERVICE AND AT 19:38 THE SERIOUS LEVEL INCIDENT WAS TERMINATED. THE US DOT, NYS PSC, NYC DEP AND FDNY WERE NOTIFIED. NOTE--THIS GAS DISTRIBUTION INCIDENT REPORT WAS GENERATED TO REPLACE GAS TRANSMISSION INCIDENT REPORT 20120102-15825