United States Nuclear Regulatory Commission - Protecting People and the Environment


ACCESSION #: 9803060156



!!!!!! THIS EVENT HAS BEEN RETRACTED. THIS EVENT HAS BEEN RETRACTED !!!!!



POWER REACTOR                           EVENT NUMBER:  33650



FACILITY: NINE MILE POINT   REGION: 1   NOTIFICATION DATE:  02/04/98

UNIT: [ ]  [2] [ ]          STATE: NY   NOTIFICATION TIME:  13:50 [ET]

RX TYPE: [1] GE-2, [2] GE-5             EVENT DATE:         02/04/98

                                        EVENT TIME:         13:50 [EST]

NRC NOTIFIED BY: KENNO LAMPMAN          LAST UPDATE DATE:   03/04/98

HQ OPS OFFICER:  JOHN MacKINNON



                                             NOTIFICATIONS

EMERGENCY CLASS: NOT APPLICABLE

10 CFR SECTION:                         LAURIE PELUSO       RDO

CCCC 21.21     UNSPECIFIED PARAGRAPH

                                        VERN HODGE (PCEB)   NRR



UNIT SCRAM CODE RX CRIT INIT PWR  INIT RX MODE  CURR PWR  CURR PWR

MODE



2         N         Y      95    POWER OPERATION    95   POWER OPERATION



                               EVENT TEXT



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).



                        (Continued on next page)







FACILITY: NINE MILE POINT                 PAGE # 2 OF EVENT NUMBER: 33650



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.



*** RETRACTION ON 03/04/98 @ 1500 EST BY LAMPMAN TAKEN BY MACKINNON

***



NIAGARA MOHAWK POWER CORPORATION (NMPC) HAS CONCLUDED, BASED

UPON FURTHER

INVESTIGATION AND TESTING OF THE EARLIER AND LATER REVISIONS OF THE

SUBJECT SERVO AMPLIFIER BOARDS, (1) THAT MISOPERATION OF THE

OVER-RANGE

SHUTDOWN CIRCUIT WAS NOT RESPONSIBLE FOR THE ANOMALY IDENTIFIED IN

THE

ABOVE NOTIFICATION, AND (2) THAT THE CRITERIA FOR REPORTABILITY UNDER

10

CFR 21 WERE THEREFORE NOT MET.  R1DO (RON BELLAMY) AND NRR PCEB

(VERN

HODGE) WERE NOTIFIED.



NMPC HEREBY RETRACTS ITS FEBRUARY 4, 1998, NOTIFICATION OF A PART 21

REPORTABLE CONDITION INVOLVING THE SUBJECT CIRCUIT BOARDS.





NIAGARA MOHAWK POWER CORPORATION

INITIAL NOTIFICATION OF PART 21 REPORTABLE, DEFECT -

RETRACTION



PLANT: Nine Mile Point Unit 2      Deficiency/Event Report NO, 2-97-3Qa



TITLE: RETRACTION OF 10CFR21 NOTIFICATION



On February 4, 1998, Niagara Mohawk Power Corporation (NMPC) notified the

NRC via facsimile of a condition involving model N100124N04 servo

amplifier boards installed in Westronics chart recorders that was

considered to be reportable with respect to 10CFR21.  The subject

recorders are utilized as RG 1.97 instruments and extensively relied upon

during transient or accident conditions.  It was believed that the

recorders were subject to lock-up under conditions involving rapid step

change or manual repositioning of the affected pens due to an over-range

shutdown feature of the board.  The purpose of this notification is to

retract NMPC's earlier facsimile 10CFR21 notification.



NMPC has concluded, based upon further investigation and testing of the

earlier and later revisions of the subject servo amplifier boards, (1)

that misoperation of the over-range shutdown circuit was list responsible

for the anomaly identified in the previous notification, and (2) that the

criteria for reportability under 10CFR21 were therefore not met.





NMPC hereby retracts its February 4, 1998, notification or a Part 21

reportable condition involving the subject circuit boards.  NMPC regrets

any inconvenience that may have been caused by the previous notification.





*** END OF DOCUMENT ***



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