United States Nuclear Regulatory Commission - Protecting People and the Environment

LICENSEE: LASALLE COUNTY STATION             
SITE: LASALLE COUNTY STATION                EN NUMBER:31093
DOCKET:                                  EVENT DATE: 09-28-96
RX TYPE:                                 EVENT TIME: 12:00
VENDORS:                                NOTIFY DATE: 10-04-96
EMERGENCY CLASS: N/A  REGION: 3 STATE: IL      TIME: 15:35
OPS OFFICER: DOUG WEAVER              
10 CFR SECTION: CCCC  21.21               UNSPECIFIED PARAGRAPH

PART 21 NOTIFICATION ON WKM MODEL 70-13 PNEUMATIC ACTUATORS      
                                                                 
ANCHOR DARLING VALVE COMPANY PERFORMED EFFECTIVE DIAPHRAGM AREA 

(EDA) TESTING ON THE VARIOUS WKM MODEL 70-13 PNEUMATIC ACTUATORS 
(SIZES 35, 70, 140, 280).  THE PRELIMINARY TEST RESULTS INDICATED
THAT THE ORIGINAL EFFECTIVE DIAPHRAGM AREA VALUES USED TO        
CALCULATE THE BENCH SET AND SUPPLY AIR SET POINTS WERE INCORRECT.
 THESE ACTUATORS ARE USED ON VARIOUS PRIMARY CONTAINMENT         
ISOLATION VALVES AND THESE VALVES MAY NOT PROVIDE ADEQUATE SYSTEM
ISOLATION UNDER DESIGN ACCIDENT CONDITIONS.                      
                                                                 
LASALLE UNIT ONE IS IN COLD SHUTDOWN AND UNIT TWO IS IN THE      
REFUEL MODE.                                                     
                                                                 
* * * UPDATE RECEIVED BY FAX AT 1508 ON 11/27/96, TAKEN BY WEAVER
* * *                                                            
                                                                 
DESIGN CHANGES FOR ALL AFFECTED PRIMARY CONTAINMENT ISOLATION    
SYSTEM (PCIS) AND REACTOR CORE ISOLATION SYSTEM (RCIC) VALVES    
HAVE BEEN INITIATED TO MAKE THE REQUIRED SETTING ADJUSTMENTS TO  
ENSURE ADEQUATE DESIGN MARGINS.  BOTH UNITS WILL REMAIN IN A     
CONDITION THAT DOESN'T REQUIRE VALVE DESIGN OPERATION UNTIL THE  
PROBLEM IS CORRECTED.                                            
                                                                 
THE LICENSEE SUBMITTED AN LER ON THIS TOPIC ON 10/28/96.  AN     
UPDATED LER WILL BE SUBMITTED ON 12/02/96.  THE HOO NOTIFIED VERN
HODGE OF THIS UPDATE.                                            
                                                                 
                                                                 

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