Headquarters Daily Report

                         AUGUST 19, 1996

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                    REPORT             NEGATIVE            NO INPUT
                    ATTACHED           INPUT RECEIVED      RECEIVED

HEADQUARTERS        û                                      
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REGION II                              û                   
REGION III          û                                      
REGION IV                              û                   
PRIORITY ATTENTION REQUIRED  MORNING REPORT - HEADQUARTERS AUGUST 19, 1996

MR Number: H-96-0063

                           NRR DAILY REPORT ITEM
                           GENERIC COMMUNICATIONS



NRC Information Notice 96-48, "Motor-Operated Valve Performance Issues," 
dated August 21, 1996.                                                   
                                                                         
The NRC is issuing this information notice to alert addressees to (1)    
lessons learned from the Electric Power Research Institute Motor-Operated
Valve (MOV) Performance Prediction Program, (2) performance problems with
MOV key failures described in a recent NRC Office for Analysis and       
Evaluation of Operation Data study, and (3) the potential for torque     
output from MOV actuators to be less than predicted by Limitorque        
Corporation.                                                             
                                                                         
Technical contacts:  Thomas G. Scarbrough, NRR      Chuck Hsu, AEOD      
                     (301) 415-2794                 (301) 415-6356       
                                                                         
                      Michael T. Bugg, RIII                              
                      (630) 829-9500                                     
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REGION III  MORNING REPORT     PAGE  2          AUGUST 19, 1996

Licensee/Facility:                     Notification:

Commonwealth Edison Co.                MR Number: 3-96-0087
Zion 1                                 Date: 08/18/96
Zion,Illinois                          SRI VIA PC                         
Dockets: 50-295
PWR/W-4-LP                            

Subject: TURBINE TRIP AND REACTOR TRIP DUE TO LOW LEVEL IN THE "D" STEAM 
         GENERATOR                                                       


Discussion:

On August 18, 1996, at 1133 hours (CDT), Unit 1 tripped on low steam     
generator level when the 1D MSIV partially closed during quarterly       
surveillance testing. Steam generator level shrunk to less than the      
low-low steam generator water level reactor trip setpoint which caused a 
reactor trip and a subsequent turbine trip.                              
                                                                         
All equipment performed as expected with two exceptions. The rod bottom  
lights for the D-4 and C-11 control rods came in slow and there was slow 
response by pressurizer level controller, 1LR-459. The slow rod bottom   
lights for control rods D-14 and C-11 were subsequently determined to be 
a problem with the rod position indication system.                       
                                                                         
During the trip transient, pressure surges in the Unit 1 heater drain    
tank (HDT) caused its rupture disk to rupture.                           
                                                                         
The 1D MSIV test failure was determined to be a failed NAMCO limit       
switch. The licensee is currently inspecting the other three MSIV NAMCO  
limit switches. The licensee is working on the HDT rupture disk          
replacement and plans to restart the unit Tuesday evening.               

Regional Action:

The resident staff are continuing to followup the licensee's             
investigation and assessment of equipment failures.                      

Contact:  L.F. MILLER, JR.           (630)829-9629
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REGION III  MORNING REPORT     PAGE  3          AUGUST 19, 1996

Licensee/Facility:                     Notification:

Commonwealth Edison Co.                MR Number: 3-96-0088
Zion 1 2                               Date: 08/19/96
Zion,Illinois                          SRI                                
Dockets: 50-295,50-304
PWR/W-4-LP,PWR/W-4-LP                 

Subject: OVERFLOW OF LAKE DISCHARGE TANK (LDT)                           

Discussion:

On Friday, Aug 16, 1996, at 8:30 p.m. (CDT) approximately 7000 gallons of
slightly contaminated water overflowed from the OB lake discharge tank   
(LDT) to the auxiliary building (AB) floor. When an LDT overflows, it is 
hard piped to a 200 gal sump. When the sump is full, it causes the floor 
drains to backup. The overflow was caused by an operator's inattention to
detail by failure to close the lake discharge tank inlet isolation valve 
0WD- 0118.                                                               

Regional Action:

The resident staff is continuing to followup the licensee's investigation
and assessment of the incident.                                          

Contact:  L.F. MILLER, JR.           (630)829-9629
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