United States Nuclear Regulatory Commission - Protecting People and the Environment


LICENSEE: BALTIMORE GAS & ELEC CO.           

SITE: CALVERT CLIFFS 1 2                    EN NUMBER:32621

DOCKET: 05000317 05000318                EVENT DATE: 06-06-97

RX TYPE: PWR PWR                         EVENT TIME: 00:00

VENDORS: CE CE                          NOTIFY DATE: 07-14-97

EMERGENCY CLASS: N/A  REGION: 1 STATE: MD      TIME: 14:11

OPS OFFICER: STEVE SANDIN             

10 CFR SECTION: CCCC  21.21               UNSPECIFIED PARAGRAPH

UNIT  SCRAM   RX   INIT  INITIAL MODE     CURR   CURRENT MODE

      CODE   CRIT  PWR                    PWR

 1    N       Y    100   POWER OPERATION  100   POWER OPERATION

 2    N       Y     99   POWER OPERATION   99   POWER OPERATION



THE LICENSEE IS MAKING A 10 CFR PART 21 NOTIFICATION.            

                                                                 

THE LICENSEE IDENTIFIED THAT THE RECENTLY INSTALLED MAIN STEAM   

HEADER RADIATION MONITORS, EXTENDED GAMMA SCINTILLATION

DETECTORS

SUPPLIED BY NUCLEAR RESEARCH CORPORATION, MODEL #MD-55E(V3),     

FAILED A CHECK SOURCE VERIFICATION UNDER NORMAL OPERATING        

CONDITIONS WITH AMBIENT TEMPERATURES BETWEEN 110�F AND 120�F.    

THE DESIGN SPECIFICATION REQUIRES OPERATION UP TO 170�F, WHICH IS

WITHIN THE VENDOR SUPPLIED OPERATING RANGE OF -22�F TO 194�F. THE

PROBLEM APPEARS TO BE RELATED TO THE TEMPERATURE COMPENSATION OF 

THE DETECTORS. THE DETECTORS WERE DECLARED INOPERABLE AND

REMOVED

FOR REPAIR AT THE VENDOR'S FACILITY.  THIS PLACES BOTH UNITS IN  

TECHNICAL SPECIFICATION 3.3.3.1, ACTION STATEMENT (30), AND IN   

THE EMERGENCY RESPONSE PLAN IMPLEMENTATION PROCEDURES WHICH      

ALLOWS AN ALTERNATE METHOD OF MONITORING EFFLUENT NOBLE GAS IN   

THE RESPECTIVE MAIN STEAM HEADER.                                

                                                                 

THE LICENSEE PLANS TO INFORM THE NRC RESIDENT INSPECTOR.         



Page Last Reviewed/Updated Thursday, March 29, 2012