United States Nuclear Regulatory Commission - Protecting People and the Environment

Morning Report for April 17, 2003



                       Headquarters Daily Report

                         APRIL 17, 2003

*********************************************************
                    REPORT             NEGATIVE       
                    ATTACHED           INPUT RECEIVED 

HEADQUARTERS                               X                   
REGION I                                   X                   
REGION II                                  X                   
REGION III              X                                      
REGION IV                                  X   


                
PRIORITY ATTENTION REQUIRED  MORNING REPORT - REGION III  APRIL 17, 2003

Licensee/Facility:                     Notification:

                                       MR Number: 3-03-0011
Lacrosse 1                             Date: 04/15/03
Lacrosse,Wisconsin                     by telephone                       
Dockets: 50-409
BWR/AC                                

Subject: UNUSUAL EVENT DECLARED AT LA CROSSE FOLLOWING REQUEST FOR       
         OFFSITE ASSISTANCE                                              


Discussion:

At approximately 11:58 a.m. (CDT) on April 15, 2003, the licensee staff  
received a carbon dioxide (CO2) system discharge alarm for the 1B        
Emergency Diesel Generator (EDG) Building at the decommissioned LaCrosse 
Nuclear Power Plant. Because discharge of the CO2 system into the        
building would create an oxygen deficient environment, the licensee      
management requested offsite assistance from the local fire department to
permit entry into the building and assess the conditions that may have   
caused the system discharge alarm. The local fire department was equipped
and trained to enter an oxygen deficient environment while the licensee  
staff did not possess this capability.                                   
                                                                         
Concurrent with its request for offsite assistance, the licensee declared
a Notice of Unusual Event (NUE) emergency classification at 12:15 p.m.   
(CDT) and initiated notifications to Local and State officials and the   
NRC. Following the initial notification, Region III staff monitored the  
licensee staff's response to and recovery from the alarm condition.      
                                                                         
The local fire department arrived at the site and assisted the licensee  
staff in its evaluation of the alarm. The fire department and licensee   
staff determined that a fire had not occurred in the 1B Emergency Diesel 
Generator Building. Instead, the CO2 system appeared to have discharged  
in response to elevated temperatures caused by a malfunctioning space    
heater. The licensee staff did not identify any other unusual conditions 
or concerns.                                                             
                                                                         
Based upon the fire department's and licensee staff's investigation of   
conditions in the 1B Emergency Diesel Generator Building, the licensee   
staff terminated the Notice of Unusual Event classification at 12:52 p.m.
                                                                         
The reactor has been shut down since 1987.                               

Contact:  MIKE JOHNSEN               (608)689-4210
          KENNETH G. O'BRIEN         (630)829-9821


Page Last Reviewed/Updated Thursday, March 29, 2012