United States Nuclear Regulatory Commission - Protecting People and the Environment


LICENSEE: ILLINOIS POWER CO.                 

SITE: CLINTON 1                             EN NUMBER:34110

DOCKET: 05000461                         EVENT DATE: 04-21-98

RX TYPE: BWR                             EVENT TIME: 00:00

VENDORS: GE-6                           NOTIFY DATE: 04-21-98

EMERGENCY CLASS: N/A  REGION: 3 STATE: IL      TIME: 10:00

OPS OFFICER: CHAUNCEY GOULD           

10 CFR SECTION: CDEG  21.21(c)(3)(i)      DEFECTS/NONCOMPLIANCE

UNIT  SCRAM   RX   INIT  INITIAL MODE     CURR   CURRENT MODE

      CODE   CRIT  PWR                    PWR

 1    N       N      0   COLD SHUTDOWN      0   COLD SHUTDOWN  



10 CFR PART 21 REPORT - LACK OF RCIC CIRCUIT ISOLATION.          

                                                                 

THE LICENSEE SUBMITTED A PART 21 REPORT CONCERNING THE           

POSSIBILITY THAT REMOTE SHUTDOWN PANEL OPERATION OF THE REACTOR  

CORE ISOLATION COOLING (RCIC) SYSTEM MAY BE PREVENTED FOLLOWING A

MAIN CONTROL ROOM FIRE DUE TO A SUPPLIER DESIGN LACKING CIRCUIT  

ISOLATION.  THIS CONDITION IS DUE TO THE INSTALLATION OF         

INTERFACE CONNECTIONS TO THE RCIC SYSTEM TO PROVIDE INPUTS FOR   

THE GE TRANSIENT ANALYSIS RECORDING SYSTEM (GETARS).  THIS GE    

DESIGN LACKED ISOLATION FOR CABLE 1RI85C CONNECTED TO THE FLOW   

CONTROL INPUT AT THE SIGNAL CONVERTER, 1E51-N590, AND CABLE      

1RI85B CONNECTED TO THE RCIC TURBINE EG-M CONTROL BOX, 1E51-N591,

SPEED OUTPUT TO THE TURBINE TACHOMETERS.                         

                                                                 

THE CORRECTIVE ACTION WILL BE TO MODIFY THE INTERFACE OF GETARS  

CABLES 1RI85B AND 1RI85C WITH THE REMOTE SHUTDOWN PANEL TO       

PROVIDE ADEQUATE ISOLATION.  THE LICENSEE WILL ALSO PERFORM A    

COMPREHENSIVE REVIEW OF SAFE SHUTDOWN REQUIRED CONTROL CIRCUITS  

TO ENSURE THAT THE POTENTIAL FOR FIRE DAMAGE IN THE MAIN CONTROL 

ROOM IS PROPERLY EVALUATED FOR IMPACT ON SAFE SHUTDOWN OPERATION 

FROM THE REMOTE SHUTDOWN PANEL.                                  

                                                                 

THE LICENSEE INFORMED THE NRC RESIDENT INSPECTOR.                





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