United States Nuclear Regulatory Commission - Protecting People and the Environment


LICENSEE: ILLINOIS POWER CO.                 

SITE: CLINTON 1                             EN NUMBER:33668

DOCKET: 05000461                         EVENT DATE: 02-06-98

RX TYPE: BWR                             EVENT TIME: 00:00

VENDORS: GE-6                           NOTIFY DATE: 02-06-98

EMERGENCY CLASS: N/A  REGION: 3 STATE: IL      TIME: 11:23

OPS OFFICER: CHAUNCEY GOULD           

10 CFR SECTION: CCCC  21.21               UNSPECIFIED PARAGRAPH

UNIT  SCRAM   RX   INIT  INITIAL MODE     CURR   CURRENT MODE

      CODE   CRIT  PWR                    PWR

 1    N       N      0   REFUELING          0   REFUELING      



10CFR PART 21 REPORT -                                           

                                                                 

THE LICENSEE INITIATED CONDITION REPORT #1-97-12-165 DUE TO OIL  

LEAKING AROUND THE DIAPHRAGM OF A REPLACEMENT PRESSURE           

REDUCING/DUMP VALVE (PART                                        

#NS108916A) INSTALLED ON AN ITT BARTON HYDRAMOTOR ACTUATOR.  THIS

WAS DISCOVERED PRIOR TO DECLARING THE HYDRAMOTOR OPERABLE DURING 

POST MAINTENANCE TESTING OF THE HYDRAMOTOR TO DETERMINE IF THE   

ASSOCIATED DAMPER MET ITS REQUIRED CLOSING TIME.  HYDRAMOTORS ARE

USED AT CLINTON TO OPERATE SAFETY-RELATED DAMPERS IN VENTILATION 

SYSTEMS.  TWO ADDITIONAL PRESSURE REDUCING/DUMP VALVES WERE      

REMOVED FROM THE STOREROOM AND BENCH TESTED WITH LEAKAGE

RESULTS 

ON ONE OF THE VALVES BEING SIMILAR TO THE VALVE INSTALLED ON THE 

HYDRAMOTOR IN THE PLANT.  THE OTHER VALVE, HOWEVER, SUCCESSFULLY 

PASSED THE TEST.  FURTHER INVESTIGATION INTO THIS CONDITION      

REVEALED                                                         

THAT THE PROBLEM WITH THE PRESSURE REDUCING/DUMP VALVE COULD     

CAUSE THE HYDRAMOTOR TO CLOSE THE DAMPER SLOWER THAN THE DESIGN  

TIME REQUIRED.                                                   

THIS IS CONTRARY TO THE PURCHASE SPECIFICATION FOR THE HYDRAMOTOR

WHICH SPECIFIES A REQUIRED DAMPER CLOSING TIME.  THE 15 REMAINING

VALVES IN THE STOREROOM WILL ALSO BE TESTED.                     

                                                                 

ON THE BASIS THAT THE PRESSURE REDUCING/DUMP VALVE DOES NOT MEET 

THE REQUIREMENT OF THE PROCUREMENT DOCUMENT AND THAT ITS         

DEFICIENCY (WHICH APPEARS TO BE DUE TO POOR MACHINING OR         

WORKMANSHIP) COULD CAUSE A SAFETY- RELATED ISOLATION DAMPER TO   

MALFUNCTION, THE LICENSEE HAS CONCLUDED THAT THIS ISSUE IS A     

10CFR PART 21.                                                   





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