Headquarters Daily Report

                         FEBRUARY 03, 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 IV  FEB. 03, 1998

Licensee/Facility:                     Notification:

Pacific Gas & Electric Co.             MR Number: 4-98-0003
Diablo Canyon 1 2                      Date: 02/03/98
Avila Beach,California                 Call from RIs                      
Dockets: 50-275,50-323
PWR/W-4-LP,PWR/W-4-LP                 

Subject: UNPLANNED POWER REDUCTION DUE TO HIGH OCEAN SWELLS              

Discussion:

On February 2, Diablo Canyon Units 1 and 2 reduced power from 100 to     
approximately 50 percent due to potential sea grass intrusion into the   
main condensers from high swells (20 - 30 feet) in the Pacific Ocean. The
high swells were associated with the large storm currently affecting the 
California coast.  The licensee plans to operate Units 1 and 2 at        
approximately 50 percent power until February 4, 1998, when weather and  
ocean conditions have been forecasted to improve.                        
                                                                         
The licensee implemented augmented management, operator, and security    
presence at the site to ensure adequate event response, if required.     
During the storm, 70 offsite emergency sirens were disabled due to high  
winds.  The licensee implemented compensatory measures and are taking    
actions to restore the sirens to service (ref. Event Report 33641).      

Regional Action:

The NRC resident inspectors provided continuous site coverage throughout 
the evening of February 2.  The inspectors will continue to monitor the  
licensee's activities and the weather conditions; expanded coverage will 
be maintained, as needed.                                                

Contact:  H. Wong                    (510)975-0296
          D. Proulx                  (805)595-2354
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