United States Nuclear Regulatory Commission - Protecting People and the Environment


LICENSEE: ABB COMBUSTION ENGINEERING         

SITE: ABB COMBUSTION ENGINEERING            EN NUMBER:33077

DOCKET:                                  EVENT DATE: 08-06-97

RX TYPE:                                 EVENT TIME: 00:00

VENDORS:                                NOTIFY DATE: 10-13-97

EMERGENCY CLASS: N/A  REGION: 1 STATE: CT      TIME: 13:42

OPS OFFICER: CHAUNCEY GOULD           

10 CFR SECTION: CCCC  21.21               UNSPECIFIED PARAGRAPH



ABB COMBUSTION REPORTED A PART 21 ON CERTAIN MODELS OF POTTER &  

BRUMFIELD RELAYS.  THEY HAVE IDENTIFIED THE "DEFECT" AS          

CONTAMINATION OF LUBRICANT WHICH HAS LEAD TO THE HARDENING OF THE

LUBRICANT IN CERTAIN POTTER & BRUMFIELD PRODUCTS DIVISION MDR    

RELAYS(MODELS "170-1" AND "7032").  THIS "DEFECT" COULD RESULT IN

RELAY FAILURE.  THESE RELAYS ARE USED IN THE PLANT PROTECTION    

SYSTEM.  THERE IS ALSO THE POTENTIAL FOR RELAY MODELS "7033" AND 

"7034" TO FAIL TO FUNCTION CORRECTLY.  THESE RELAYS HAVE BEEN    

SUPPLIED TO PALO VERDE 1, 2 AND 3, ARKANSAS NUCLEAR ONE UNIT 2,  

WATERFORD 3, AND SAN ONOFRE 2 AND 3.  ABB-CE IS CURRENTLY        

EVALUATING POTENTIAL CORRECTIVE ACTIONS WHICH WILL BE PROVIDED TO

THE UTILITIES WITH ABB-CE DESIGNED NUCLEAR STEAM SUPPLY SYSTEMS. 

                                                                 

* *  * UPDATE AT 1510 BY FAX FROM HESS ENTERED BY JONES * * *    

                                                                 

POTTER & BRUMFIELD, AS OF A CONFERENCE CALL WITH ABB ON NOVEMBER 

17, 1997, HAS EXTENDED THE PROBLEM TO INCLUDE ALL MDR RELAY      

MODELS WITH DATE CODES 93XX THROUGH 95XX.  PREVIOUSLY ONLY MODELS

WITH DATE CODES OF 94XX WERE THOUGHT AFFECTED.  POTTER &         

BRUMFIELD HAS COMMITTED TO COMPLETE ITS ROOT CAUSE ANALYSIS ON   

THE FAILURE MECHANISM, ISSUE A WRITTEN REPORT WITH DETAILED DATE 

CODE IDENTIFICATION, AND RECOMMENDED CORRECTIVE ACTIONS BY       

DECEMBER 1, 1997.  ABB-CE WILL INFORM ITS CUSTOMERS OF THIS      

CHANGE.                                                          

                                                                 

THE HEADQUARTERS OPERATIONS OFFICER INFORMED R4DO (JOE TAPIA) AND

NRR (VERN HODGE).                                                



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