United States Nuclear Regulatory Commission - Protecting People and the Environment


LICENSEE: ABB COMBUSTION ENGINEERING         

SITE: ABB COMBUSTION ENGINEERING            EN NUMBER:33188

DOCKET:                                  EVENT DATE: 10-30-97

RX TYPE:                                 EVENT TIME: 00:00

VENDORS:                                NOTIFY DATE: 10-30-97

EMERGENCY CLASS: N/A  REGION: 1 STATE: CT      TIME: 09:55

OPS OFFICER: FANGIE JONES             

10 CFR SECTION: CCCC  21.21               UNSPECIFIED PARAGRAPH



ABB-CE 10CFR21 REPORT ON NUT AND WASHER PLATES MADE OF INCORRECT 

MATERIAL.                                                        

                                                                 

ON SEPTEMBER 18, 1997 ABB-CE RECEIVED INFORMATION REGARDING      

INCORRECT NUT AND WASHER PLATE MATERIAL SUPPLIED TO PECO FOR USE 

AT PEACH BOTTOM UNIT 3. THE INCORRECT MATERIAL WAS DISCOVERED BY 

PECO DURING RECEIPT INSPECTION.                                  

THE AFFECTED NUT AND WASHER PLATES WERE NOT INSTALLED AND NO     

OTHER APPLICATIONS EXIST AS THIS WOULD HAVE BEEN THE FIRST       

APPLICATION.  THE NUT AND WASHER PLATES WERE SUPPLIED TO ABB-CE  

BY US TOOL AND DIE COMPANY.                                      

                                                                 

THE NUT AND WASHER PLATES WERE TO BE USED IN EMERGENCY CORE      

COOLING SYSTEM (ECCS) SUCTION STRAINER BOLTED CONNECTIONS.  THE  

INCORRECT MATERIAL COULD RESULT IN FAILURE TO ACHIEVE PROPER BOLT

PRELOAD, POTENTIALLY RESULTING IN STRAINER MODULES SEPARATING BY 

MORE THAN THE DESIGN LIMIT OF 1/8 INCH DURING SOME LOADING CASES.

                                                                 

ABB-CE IS PREPARING TRAINING CLASSES TO STRENGTHEN ITS OWN       

INTERNAL REVIEW PROCESSES TO PREVENT REOCCURRENCES OF THIS ERROR.

 ABB-CE IS PROVIDING AN INFORMATION COPY OF THE 10CFR21 REPORT TO

PECO ENERGY, STONE AND WEBSTER ENGINEERING CORPORATION, AND      

UTILITIES OWNING AN ABB-CE DESIGNED NUCLEAR STEAM SUPPLY SYSTEM. 

                                                                 

US TOOL AND DIE COMPANY IS REVISING ITS INTERNAL PROCEDURES TO   

PREVENT A RECURRENCE OF THIS ERROR.  THEY HAVE INITIATED A       

REQUIREMENT THAT ALL CONTRACT MATERIAL BE RECEIPT INSPECTED IN   

ACCORDANCE WITH APPROVED CUSTOMER DOCUMENTS.                     



Page Last Reviewed/Updated Thursday, March 29, 2012