United States Nuclear Regulatory Commission - Protecting People and the Environment


LICENSEE: OMAHA PUBLIC POWER DISTRICT        

SITE: FT CALHOUN 1                          EN NUMBER:32384

DOCKET: 05000285                         EVENT DATE: 05-23-97

RX TYPE: PWR                             EVENT TIME: 10:40

VENDORS: CE                             NOTIFY DATE: 05-23-97

EMERGENCY CLASS: N/A  REGION: 4 STATE: NE      TIME: 17:50

OPS OFFICER: STEVE SANDIN             

10 CFR SECTION: CDEG  21.21(c)(3)(i)      DEFECTS/NONCOMPLIANCE

UNIT  SCRAM   RX   INIT  INITIAL MODE     CURR   CURRENT MODE

      CODE   CRIT  PWR                    PWR

 1    N       Y    100   POWER OPERATION  100   POWER OPERATION



THE LICENSEE IS MAKING A PART 21 NOTIFICATION REGARDING DEFECTIVE

RAW WATER PUMP IMPELLERS.                                        

                                                                 

THE LICENSEE IDENTIFIED THAT THE REPLACEMENT IMPELLERS FOR BYRON 

JACKSON RAW WATER PUMPS HAD BLADE DIMENSIONS OUT OF TOLERANCE.   

AN ENGINEERING EVALUATION OF THE DIMENSIONAL INACCURACIES        

DETERMINED THAT PUMP DISCHARGE FLOWS USING THESE IMPELLERS WOULD 

NOT SATISFY ACCEPTANCE CRITERIA AND COULD POSE A SUBSTANTIAL     

SAFETY HAZARD UNDER CERTAIN CIRCUMSTANCES.  THIS PROBLEM WAS     

INITIALLY IDENTIFIED ON 4/8/97.  ONE OF THE IMPELLERS WAS        

INSTALLED AND SUBSEQUENTLY REMOVED FROM RAW WATER PUMP

ASSEMBLY  

AC-10D WHICH FAILED POST MAINTENANCE TESTING.  BOTH DEFECTIVE    

IMPELLERS WERE RETURNED TO THE SUPPLIER. THE LICENSEE DOES NOT   

KNOW IF OTHER FACILITIES ARE AFFECTED.                           

                                                                 

THE LICENSEE INFORMED THE NRC RESIDENT INSPECTOR.                



Page Last Reviewed/Updated Thursday, March 29, 2012