United States Nuclear Regulatory Commission - Protecting People and the Environment


LICENSEE: COOPER ENERGY SERVICES             

SITE: COOPER ENERGY SERVICES                EN NUMBER:32250

DOCKET:                                  EVENT DATE: 05-01-97

RX TYPE:                                 EVENT TIME: 11:40

VENDORS:                                NOTIFY DATE: 05-01-97

EMERGENCY CLASS: N/A  REGION: 1 STATE: PA      TIME: 11:40

OPS OFFICER: JOHN MacKINNON           

10 CFR SECTION: CCCC  21.21               UNSPECIFIED PARAGRAPH



THIS IS AN UPDATE TO A 10 CFR PART 21 SUBMITTED BY COOPER ENERGY 

SERVICES JUNE 19, 1991.                                          

                                                                 

COOPER ENERGY SERVICES, (CES), A DIVISION OF COOPER CAMERON      

CORPORATION, HEREBY NOTIFIES THE NRC OF A RE-EMPHASIS OF A       

PREVIOUSLY REPORTED POTENTIAL DEFECT IN A COMPONENT OF A DSRV AND

DSR ENTERPRISE STANDBY DIESEL GENERATOR SYSTEM. THERE EXISTS A   

POTENTIAL PROBLEM WITH INTAKE AND EXHAUST POWER VALVE SPRINGS    

WHICH COULD RESULT IN ENGINE NON-AVAILABILITY.                   

                                                                 

THE SPECIFIC SPRINGS UNDER DISCUSSION ARE MANUFACTURED BY        

ASSOCIATED SPRING IN CORRY, PENNSYLVANIA. THEY ARE INSTALLED AS A

SUBCOMPONENT OF SPARE CYLINDER HEADS (4 SPRINGS PER CYLINDER     

HEAD) OR PROVIDED AS INDIVIDUAL SPARE COMPONENTS BY CES. 10 CFR  

21 REPORT # 157 WAS ISSUED BY COOPER ENERGY SERVICES ON JUNE 19, 

1991 TO DESCRIBE SURFACE DEFICIENCIES FOUND ON VALVE SPRINGS IN  

CES' INVENTORY. THESE DEFICIENCIES, CHARACTERIZED BY DRAW MARKS  

EXCEEDING THE DEPTH ALLOWED BY SPECIFICATION, WERE NOTED ON      

SPRINGS FROM A 1986 MANUFACTURING LOT. THERE HAD BEEN NO REPORTED

FAILURE OF VALVE SPRINGS IN NUCLEAR OR COMMERCIAL SERVICE. ACTION

WAS TAKEN TO INSPECT ALL SPRINGS IN CES' INVENTORY, ENHANCE      

SUPPLIER INSPECTION PROCEDURES AND RECOMMEND PERIODIC INSPECTION 

OF ALL SPRINGS IN SERVICE.                                       

                                                                 

DURING THE SUMMER OF 1996 A BROKEN VALVE SPRING WAS FOUND AT DUKE

POWER'S CATAWBA STATION DURING A ROUTINE MAINTENANCE INSPECTION. 

NO AFFECT ON ENGINE PERFORMANCE HAD BEEN NOTED. THIS SPRING,     

RECENTLY RETURNED TO CES' FOR ANALYSIS, WAS FOUND TO BE OF THE   

SAME 1986 VINTAGE AS THOSE PREVIOUSLY DESCRIBED IN REPORT # 157. 

CES HAS REVIEWED THIS FAILURE AND BELIEVES IT TO BE AN ISOLATED  

CASE BUT IS ISSUING REPORT #157 AMENDMENT 1 TO INFORM THOSE      

AFFECTED OF THIS FAILURE AND TO RE-EMPHASIZE THE RECOMMENDED     

CORRECTIVE ACTION.                                               

                                                                 

IT IS RECOMMENDED THAT THE SUBJECT SPRINGS BE INSPECTED ON A     

PERIODIC BASIS, SUCH AS DURING REFUELING OUTAGES. ANY SPRINGS    

WITH A VISIBLE DRAW MARK ON ITS I.D. OR ANY PHYSICAL ANOMALY OF  

CONCERN SHOULD BE REMOVED, DISCARDED AND REPLACED. THIS          

INSPECTION SHOULD BE IN EACH PLANT'S MECHANICAL MAINTENANCE      

PROCEDURES AND SHOULD BE CONSIDERED TO APPLY TO ALL VALVE SPRINGS

ON ENTERPRISE ENGINES REGARDLESS OF THEIR ORIGINAL MANUFACTURER. 

                                                                 

IT SHOULD ALSO BE NOTED THAT A CORRECTION SHOULD BE MADE TO THE  

ORIGINAL 10 CFR PART 21 REPORT # 157 WORDING PAGE 2, PARA. 5 TO  

READ AS FOLLOWS, 'THE NUMBER OF OPERATING HOURS IS OF CONCERN AS 

THE FATIGUE FAILURE RESULTING FROM SUCH AN INDICATION SHOULD     

OCCUR WITHIN APPROXIMATELY 740 HOURS (1E+7 OPERATING CYCLES)."   

                                                                 

PLANTS AFFECTED ARE: GRAND GULF, RIVER BEND, SHEARON HARRIS,     

CATAWBA, SAN ONOFRE, PERRY, COMANCHE PEAK, AND VOGTLE.           



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