Headquarters Daily Report

                         SEPTEMBER 09, 1997

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                    REPORT             NEGATIVE            NO INPUT
                    ATTACHED           INPUT RECEIVED      RECEIVED

HEADQUARTERS                           û                   
REGION I                               û                   
REGION II           û                                      
REGION III                             û                   
REGION IV                              û                   
PRIORITY ATTENTION REQUIRED  MORNING REPORT - REGION II  SEP. 09, 1997

Licensee/Facility:                     Notification:

Duke Power Co.                         MR Number: 2-97-0070
Mc Guire 1 2                           Date: 09/09/97
Cornelius,North Carolina                                                  
Dockets: 50-369,50-370
PWR/W-4-LP,PWR/W-4-LP                 

Subject: DUAL UNIT REACTOR TRIP - UPDATE                                 
Reportable Event Number: 32883                         

Discussion:

This is an update to the September 6, 1997, automatic trip of McGuire    
Units 1 and 2 that occurred when the alternate supply breaker to         
non-safety 120 VAC instrument and control power bus KXA opened; thereby  
stripping control power to several plant components in both units.       
Specifically, the resultant loss of main feedwater pump speed control in 
Unit 1 led to the pumps tripping and a subsequent main turbine/reactor   
trip. Affecting different components in Unit 2, the control power loss in
that unit caused main steam isolation valves to close and rendered the   
primary power operated relief valves inoperable, which resulted in a     
reactor trip on pressurizer high pressure. (The affected circuits were   
control power only; nonsafety-related.  See PN 2-97-51 for further       
information.)                                                            
                                                                         
Under normal conditions, an inverter provides two sources of power to bus
KXA through an automatic transfer switch. At the time of this dual unit  
reactor trip event, bus KXA was being powered from its alternate         
regulated power supply because its normal inverter supply had been taken 
out of service in support of associated battery testing and equalizing   
charge. Post-trip investigation determined that a loose lug was the cause
for the tripping of the alternate supply breaker to bus KXA. Accordingly,
the licensee replaced this breaker and checked similar lug connections in
the plant.                                                               
                                                                         
Having restarted at 5:05 a.m. on September 9, 1997, Unit 1 will be held  
at 15 percent power to make feedwater control adjustments before         
continuing on with power escalation. The licensee is currently planning  
to restart Unit 2 later today.                                           
                                                                         

Regional Action:

The Resident Inspector staff responded onsite to this dual unit event,   
and will continue to followup on the licensee's recovery activities.     

Contact:  R. CARROLL                 (404)562-4511
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