Headquarters Daily Report

                         FEBRUARY 14, 1997

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                    REPORT             NEGATIVE            NO INPUT
                    ATTACHED           INPUT RECEIVED      RECEIVED

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REGION II                              û                   
REGION III          û                                      
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PRIORITY ATTENTION REQUIRED  MORNING REPORT - REGION III  FEB. 14, 1997

Licensee/Facility:                     Notification:

Commonwealth Edison Co.                MR Number: 3-97-0029
Byron 1                                Date: 02/14/97
Byron,Illinois                         RI VIA TELECON AND PC              
Dockets: 50-454
PWR/W-4-LP                            

Subject: FAILED FEED PUMP SHAFT GLAND SEAL LINE AND EARLY ENTRY INTO A   
         PLANNED SHUTDOWN AND OUTAGE                                     


Discussion:

AT APPROXIMATELY 11:00 P.M. (CST) ON FEBRUARY 13, 1997, A CRACK DEVELOPED
IN A WELD ON A PUMP SHAFT GLAND SEAL WATER RETURN LINE FOR THE 1C TURBINE
DRIVEN MAIN FEEDWATER PUMP. THE CRACK RESULTED IN A STEAM LEAK. THE      
LICENSEE WAS IN THE PROCESS OF RETURNING THE 1C FEEDWATER PUMP TO SERVICE
FOLLOWING MAINTENANCE AT THE TIME OF THE EVENT. THE LICENSEE WAS UNABLE  
TO ISOLATE THE LEAKING WATER AND STEAM COMING FROM THE HEATER DRAIN TANK 
BACK THROUGH THE FAILED LINE. UNIT 1 POWER WAS REDUCED TO APPROXIMATELY  
25 PERCENT TO ALLOW ISOLATION OF THE FEEDWATER HEATERS AND REMOVE THE    
HEAT INPUT TO THE HEATER DRAIN TANK. ON 2/14/97, AS OF 8:00 A.M. CST THE 
LICENSEE WAS PREPARING TO SHUTDOWN UNIT 1 AND BEGIN A SCHEDULED          
MAINTENANCE OUTAGE 24 HOURS EARLIER THAN ORIGINALLY PLANNED. THE STEAM   
LEAK DID NOT INVOLVE ANY SAFETY-RELATED EQUIPMENT. ALL AUXILIARY         
FEEDWATER PUMPS WERE OPERABLE. THE CAUSE OF THE CRACK IS UNDER           
INVESTIGATION BY THE LICENSEE.                                           
                                                                         
THE LICENSEE WAS SCHEDULED TO BEGIN A 12 DAY MAINTENANCE OUTAGE ON       
FEBRUARY 15, 1997. REACTOR CONTAINMENT FAN COOLERS (RCFC) 1D AND 1C WERE 
EXHIBITING ESSENTIAL SERVICE WATER FLOW REDUCTION FROM THE NOMINAL VALUES
DURING MONTHLY SURVEILLANCES. THE LICENSEE IS PLANNING TO INSTALL A      
MODIFICATION TO BACKFLUSH THE HEAT EXCHANGERS AND IDENTIFY THE CAUSE OF  
THE FLOW REDUCTION. SILT BUILDUP IS SUSPECTED AND IS THE SUBJECT OF      
ENFORCEMENT DISCUSSED IN INSPECTION REPORT (50-454 & 455/96009.)         

Regional Action:

THE RESIDENT INSPECTOR IS MONITORING THE ACTIVITIES.                     

Contact:  R. D. LANKSBURY            (630)829-9631
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