Headquarters Daily Report

                         JUNE 29, 1998

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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 III  JUNE 29, 1998


Licensee/Facility:                     Notification:

Commonwealth Edison Co.                MR Number: 3-98-0049
Quad Cities 1 2                        Date: 06/28/98
Cordova,Illinois                                                          
Dockets: 50-254,50-265
BWR/GE-3,BWR/GE-3                     

Subject: Independent reactor scrams of Units 1 and 2                     

Discussion:

At 5:11 p.m. on June 27, 1998, Unit 1 scrammed from approximately 100%   
power due to coincident half scrams when a level switch failed while a   
surveillance was being performed. A half scram signal was inserted in    
order to perform testing on average power range monitor instruments.     
During the test, a scram discharge volume level switch actuated,         
generating a scram signal on the other reactor protection system channel 
resulting in a full scram. The following reactor vessel level drop       
actuated containment isolation for groups 2 and 3 logic which was        
expected. The main steam isolation valves remained open and no safety    
relief valves opened. With minor exceptions, equipment performed as      
expected. The licensee corrected the level switch problem.               
                                                                         
At 2:23 a.m. CDT on June 28, 1998, Unit 2 scrammed during electrical     
storms. The cause appears to be output breaker trips resulting from      
damage to a transmission line miles from the plant. In addition, there   
was considerable lightning activity around the plant. The plant safety   
systems responded as expected without lifting safety relief valves,      
however some electrical anomalies occurred which may be lightning        
related. For example, the first out annunciator indicated that a manual  
scram was initiated. The licensee was investigating the trip further.    

Regional Action:

Resident inspection staff responded to the site following each scram and 
are reviewing the licensee's cause investigations and observing the      
planned restart of Unit 1 today. A Division of Reactor Safety electrical 
specialist was also dispatched to the site to review the electrical      
disturbances on Unit 2.                                                  

Contact:  M. Ring                    (630)829-9703
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