United States Nuclear Regulatory Commission - Protecting People and the Environment

LICENSEE: COMMONWEALTH EDISON CO.            
SITE: LASALLE 1 2                           EN NUMBER:30999
DOCKET: 05000373 05000374                EVENT DATE: 09-11-96
RX TYPE: BWR BWR                         EVENT TIME: 00:01
VENDORS: GE-5 GE-5                      NOTIFY DATE: 09-13-96
EMERGENCY CLASS: N/A  REGION: 3 STATE: IL      TIME: 10:43
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       Y    100   POWER OPERATION  100   POWER OPERATION
 2    N       Y     82   POWER OPERATION   82   POWER OPERATION

THE LICENSEE FOLLOWED UP ON A PROBABLE PART 21 THAT WAS SUBMITTED
BY GENERAL ELECTRIC NUCLEAR ENERGY (GE-NE).                      
                                                                 
THE NOTIFICATION SUBMITTED BY GE-NE PROVIDED THE RESULTS OF AN   
EVALUATION MADE BY GE-NE OF REPORTED FAILURES OF THE             
INSTANTANEOUS TRIP FUNCTION OF THE GE TYPE RMS-9 OVERCURRENT TRIP
DEVICE PROGRAMMERS. THESE DEVICES WERE MANUFACTURED BY GE        
ELECTRICAL DISTRIBUTION AND CONTROL, AND SUPPLIED BY GE-NE AS    
SAFETY RELATED COMPONENTS FOR BALANCE-OF-PLANT OR UNSPECIFIED    
APPLICATIONS. SINCE THE APPLICATIONS AND ASSOCIATED SAFETY       
FUNCTIONS OF RMS-9 PROGRAMMERS SUPPLIED BY GE-NE ARE NOT KNOWN,  
IT IS NOT POSSIBLE FOR GE-NE TO EVALUATE THE SAFETY SIGNIFICANCE 
OF A POSSIBLE FAILURE.                                           
                                                                 
LASALLE EVALUATED THE GE REPORT AND HAS DETERMINED THAT THE      
DEFECT/NONCOMPLIANCE IS REPORTABLE UNDER THE REQUIREMENTS OF     
10CFR21.                                                         
                                                                 
GE-NE HAS LISTED APPROXIMATELY 27 PLANTS THAT ARE AFFECTED.      

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