Part 21 Report - 1998-190
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 Wednesday, March 24, 2021