United States Nuclear Regulatory Commission - Protecting People and the Environment


LICENSEE: NIAGARA MOHAWK POWER CORP.         

SITE: NINE MILE POINT 2                     EN NUMBER:33650

DOCKET:  05000410                        EVENT DATE: 02-04-98

RX TYPE:  BWR                            EVENT TIME: 13:50

VENDORS:  GE-5                          NOTIFY DATE: 02-04-98

EMERGENCY CLASS: N/A  REGION: 1 STATE: NY      TIME: 13:50

OPS OFFICER: JOHN MacKINNON           

10 CFR SECTION: CCCC  21.21               UNSPECIFIED PARAGRAPH

UNIT  SCRAM   RX   INIT  INITIAL MODE     CURR   CURRENT MODE

      CODE   CRIT  PWR                    PWR

 2    N       Y     95   POWER OPERATION   95   POWER OPERATION



10 CFR PART 21:  LOCKUP OF WESTRONICS RECORDERS DUE TO SERVO     

AMPLIFIER BOARD OVERRANGE FEATURE - THIS PROBLEM WAS CORRECTED IN

THE FALL OF 1997.                                                

                                                                 

DESCRIPTION OF CONDITION:                                        

                                                                 

THE DEVIATION DESCRIBED IN THE REFERENCED DEVIATION EVENT REPORTS

(DER) AFFECTS THE FIVE SAFETY-RELATED (SR) RECORDERS.  RECORDERS 

2ISC*LR1623A/B AND 2ISC*PR1623A/B WERE SUPPLIED TO GENERAL       

ELECTRIC (GE) BY WESTRONICS AS NON-SAFETY-RELATED INSTRUMENTS    

(NSR) AND WERE UPGRADED TO SR BY GE (PURCHASE ORDER/SPEC. P800A).

 FUEL ZONE LEVEL RECORDER 2ISC*LR1615 WAS SUPPLIED AS SR         

EQUIPMENT AND IS FED FROM TRANSMITTER 2ISC*LT13B.  THE WIDE RANGE

LEVEL RECORDERS 2ISC*LR1623A/B ARE FED FROM TRANSMITTERS         

2ISC*LT9A/B. THE LATTER RECORDERS EACH ALSO DISPLAY VESSEL       

PRESSURE ON A SECOND CHANNEL AND PEN.  THE PRESSURE CHANNELS     

2ISC*PR1623A/B ARE FED FROM PRESSURE TRANSMITTERS 2ISC*PT16A/B.  

ALL OF THE AFFECTED RECORDERS ARE ON MAIN CONTROL ROOM PANEL     

2CEC*PNL601.  ALL OF THESE RECORDERS ARE SR TECHNICAL            

SPECIFICATIONS POST-ACCIDENT MONITORING INSTRUMENTS.  THEY ARE   

IDENTIFIED ON THE NMP2 MASTER EQUIPMENT LIST AS REGULATORY GUIDE 

1.97 MONITORING EQUIPMENT.  ALL OF THE ABOVE MENTIONED RECORDERS 

WERE INSTALLED WHEN THE PLANT WAS INITIALLY LICENSED.            

                                                                 

DERs 2-97-1662 AND 2-97-3030 DESCRIBE FAILURES OF THE AFFECTED   

VESSEL PRESSURE AND LEVEL RECORDERS LISTED ABOVE SUCH THAT THE   

AFFECTED RECORDER CHANNEL LOCKS UP TEMPORARILY UNDER CONDITIONS  

WHERE THEY EXPERIENCE A LARGE STEP CHANGE IN THE PROCESS VARIABLE

MONITORED OR WHEN THE RECORDERS HAVE THE PEN MANUALLY MOVED

FROM 

THE POSITION TO WHICH IT WAS DRIVEN BY THE SERVO AMPLIFIER BOARD 

(WESTRONICS PART NUMBER CB100124N04).                            

                                                                 

ALL OF THE POTENTIALLY AFFECTED RECORDERS NOW ARE (AS OF THE FALL

OF 1997) NOW EQUIPPED WITH THE NEWER SERVO AMPLIFIER BOARDS.     

THESE BOARDS HAVE AN INHERENT TIME DELAY THAT ALLOWS THE BOARD TO

FUNCTION UNDER TRANSIENT CONDITIONS WITHOUT LOCKING UP.  THERE   

HAVE BEEN NO FURTHER FAILURES (OF THE TYPE DESCRIBED) EXPERIENCED

SINCE THE INSTALLATION OF THE NEW BOARDS. THEREFORE, NO FURTHER  

MAINTENANCE ACTION IS REQUIRED WITH RESPECT TO THESE RECORDERS.  

                                                                 

PROCUREMENT PERSONNEL HAVE VERIFIED THAT NONE OF THE OLDER MODEL 

BOARDS ARE BEING UTILIZED AT NINE MILE POINT UNIT 1 OR ARE BEING 

MAINTAINED AS SPARES.                                            



LICENSEE: NIAGARA MOHAWK POWER CORP.         

SITE: NINE MILE POINT 2                     EN NUMBER:33650

DOCKET:  05000410                        EVENT DATE: 02-04-98

RX TYPE:  BWR                            EVENT TIME: 13:50

VENDORS:  GE-5                          NOTIFY DATE: 02-04-98

EMERGENCY CLASS: N/A  REGION: 1 STATE: NY      TIME: 13:50

OPS OFFICER: JOHN MacKINNON           

10 CFR SECTION: CCCC  21.21               UNSPECIFIED PARAGRAPH

UNIT  SCRAM   RX   INIT  INITIAL MODE     CURR   CURRENT MODE

      CODE   CRIT  PWR                    PWR

 2    N       Y     95   POWER OPERATION   95   POWER OPERATION



10 CFR PART 21:  LOCKUP OF WESTRONICS RECORDERS DUE TO SERVO     

AMPLIFIER BOARD OVERRANGE FEATURE - THIS PROBLEM WAS CORRECTED IN

THE FALL OF 1997.                                                

                                                                 

DESCRIPTION OF CONDITION:                                        

                                                                 

THE DEVIATION DESCRIBED IN THE REFERENCED DEVIATION EVENT REPORTS

(DER) AFFECTS THE FIVE SAFETY-RELATED (SR) RECORDERS.  RECORDERS 

2ISC*LR1623A/B AND 2ISC*PR1623A/B WERE SUPPLIED TO GENERAL       

ELECTRIC (GE) BY WESTRONICS AS NON-SAFETY-RELATED INSTRUMENTS    

(NSR) AND WERE UPGRADED TO SR BY GE (PURCHASE ORDER/SPEC. P800A).

 FUEL ZONE LEVEL RECORDER 2ISC*LR1615 WAS SUPPLIED AS SR         

EQUIPMENT AND IS FED FROM TRANSMITTER 2ISC*LT13B.  THE WIDE RANGE

LEVEL RECORDERS 2ISC*LR1623A/B ARE FED FROM TRANSMITTERS         

2ISC*LT9A/B. THE LATTER RECORDERS EACH ALSO DISPLAY VESSEL       

PRESSURE ON A SECOND CHANNEL AND PEN.  THE PRESSURE CHANNELS     

2ISC*PR1623A/B ARE FED FROM PRESSURE TRANSMITTERS 2ISC*PT16A/B.  

ALL OF THE AFFECTED RECORDERS ARE ON MAIN CONTROL ROOM PANEL     

2CEC*PNL601.  ALL OF THESE RECORDERS ARE SR TECHNICAL            

SPECIFICATIONS POST-ACCIDENT MONITORING INSTRUMENTS.  THEY ARE   

IDENTIFIED ON THE NMP2 MASTER EQUIPMENT LIST AS REGULATORY GUIDE 

1.97 MONITORING EQUIPMENT.  ALL OF THE ABOVE MENTIONED RECORDERS 

WERE INSTALLED WHEN THE PLANT WAS INITIALLY LICENSED.            

                                                                 

DERs 2-97-1662 AND 2-97-3030 DESCRIBE FAILURES OF THE AFFECTED   

VESSEL PRESSURE AND LEVEL RECORDERS LISTED ABOVE SUCH THAT THE   

AFFECTED RECORDER CHANNEL LOCKS UP TEMPORARILY UNDER CONDITIONS  

WHERE THEY EXPERIENCE A LARGE STEP CHANGE IN THE PROCESS VARIABLE

MONITORED OR WHEN THE RECORDERS HAVE THE PEN MANUALLY MOVED

FROM 

THE POSITION TO WHICH IT WAS DRIVEN BY THE SERVO AMPLIFIER BOARD 

(WESTRONICS PART NUMBER CB100124N04).                            

                                                                 

ALL OF THE POTENTIALLY AFFECTED RECORDERS NOW ARE (AS OF THE FALL

OF 1997) NOW EQUIPPED WITH THE NEWER SERVO AMPLIFIER BOARDS.     

THESE BOARDS HAVE AN INHERENT TIME DELAY THAT ALLOWS THE BOARD TO

FUNCTION UNDER TRANSIENT CONDITIONS WITHOUT LOCKING UP.  THERE   

HAVE BEEN NO FURTHER FAILURES (OF THE TYPE DESCRIBED) EXPERIENCED

SINCE THE INSTALLATION OF THE NEW BOARDS. THEREFORE, NO FURTHER  

MAINTENANCE ACTION IS REQUIRED WITH RESPECT TO THESE RECORDERS.  

                                                                 

PROCUREMENT PERSONNEL HAVE VERIFIED THAT NONE OF THE OLDER MODEL 

BOARDS ARE BEING UTILIZED AT NINE MILE POINT UNIT 1 OR ARE BEING 

MAINTAINED AS SPARES.                                            





Page Last Reviewed/Updated Thursday, March 29, 2012