Part 21 Report - 1998-610

LICENSEE: COOPER ENERGY SERVICES SITE: COOPER ENERGY SERVICES EN NUMBER:34708 DOCKET: EVENT DATE: 08-28-98 RX TYPE: EVENT TIME: 00:00 VENDORS: NOTIFY DATE: 08-28-98 EMERGENCY CLASS: N/A REGION: 1 STATE: PA TIME: 15:43 OPS OFFICER: BOB STRANSKY 10 CFR SECTION: CCCC 21.21 UNSPECIFIED PARAGRAPH 10 CFR PART 21 REPORT REGARDING ENTERPRISE DSR-4 AND DSRV-4 EMERGENCY DIESEL GENERATOR STARTING AIR PRESSURE SWITCHES "THE FUNCTION OF THE STARTING AIR PRESSURE SWITCHES (PS-3B & 4B) IS TO DE-ENERGIZE THE STARTING AIR SOLENOID VALVES ON THE CONDITION THAT THE STANDBY DIESEL GENERATOR DOES NOT START WITH AN EMERGENCY START SIGNAL. THE PRESSURE SWITCHES ARE SET FOR A LOW PRESSURE LIMIT (TYPICALLY 150 PSI FALLING) TO ENSURE A SUFFICIENT VOLUME OF AIR IN THE STARTING AIR RECEIVERS TO ALLOW THE OPERATOR TO HAVE MORE THAN TWO ADDITIONAL MANUAL STARTS. WHEN THE STANDBY DIESEL GENERATOR IS RUNNING IN AN EMERGENCY MODE AND A NON-ESSENTIAL PNEUMATIC SHUTDOWN SENSOR TRIPS, STARTING AIR PRESSURE IS VENTED FROM THE SYSTEM. AT THE LOW LIMIT SETTING THE STARTING AIR PRESSURE SWITCHES WILL OPEN, DEENERGIZING THE DEACTIVATE SHUTDOWN SOLENOID VALVE. WITH THE SOLENOID VALVE DE-ENERGIZED, THE SHUTDOWN CIRCUIT WILL RECOGNIZE ANY NON-ESSENTIAL SHUTDOWN SIGNAL RESULTING IN A SHUTDOWN OF THE STANDBY DIESEL GENERATOR. "TO CORRECT THIS CONDITION THE PRESSURE SWITCHES NEED TO BE REWIRED TO A DIFFERENT LOCATION." AFFECTED UTILITIES: ALL ENTERPRISE EDGs EXCEPT THOSE AT PLANT VOGTLE.

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