Part 21 Report - 1995-116

COOPER ENERGY SERVICES         28710 04-21-95 OTH
LICENSEE: COOPER ENERGY SERVICES             
SITE: .COOPER ENERGY SERVICES        .        EN NUMBER:28710
DOCKET:                                  EVENT DATE: 04-21-95
RX TYPE:                                 EVENT TIME: 13:02
VENDORS:                                NOTIFY DATE: 04-21-95
EMERGENCY CLASS: N/A  REGION: 1 STATE: PA      TIME: 13:02
OPS OFFICER: JOSEPH SEBROSKY          
10 CFR SECTION: CCCC  21.21               UNSPECIFIED PARAGRAPH

COOPER ENERGY SERVICES OF GROVE CITY, PA IS ISSUING A 10 CFR PART
21 REPORT DUE TO A POTENTIAL DESIGN DEFECT OF THE KSV EMERGENCY  
DIESEL GENERATOR (EDG) SYSTEM.                                   
                                                                 
THE PROBLEM WAS FIRST REPORTED AT NINE MILE POINT UNIT 2 AND     
CONCERNS A POTENTIAL DEFECT WITH THE COOLING WATER SYSTEM FOR THE
MECHANICAL GOVERNOR. ON JANUARY 29, 1995 UNIT 2 EXPERIENCED A    
GOVERNOR FAILURE OF THE DIVISION 1 EDG DUE TO OVERHEATING OF THE 
GOVERNOR.  TESTING OF THE FAILED MECHANICAL GOVERNOR REVEALED    
THAT THE ROOT CAUSE OF THE FAILURES WAS: 1) A LOW OR NO FLOW     
CONDITION DURING LOW COOLING WATER FLOW CONDITIONS, 2) TOO SMALL 
AND/OR LONG WATER TUBING RUNS, 3) LOW DIFFERENTIAL PRESSURE      
ACROSS THE INTERCOOLERS (THE SOURCE OF COOLING WATER FOR THE     
GOVERNOR COOLING SYSTEM).                                        
THE COOLING SYSTEM FOR THE MECHANICAL GOVERNOR WAS DESIGNED AND  
SUPPLIED BY COOPER-BESSEMER.  THE PLANTS THAT ARE AFFECTED ARE   
NINE MILE POINT UNIT 2, AND BYRON UNITS 1 AND 2.