05000315/LER-1985-057, :on 851025,reactor Trip Signal Generated When Power Range Instruments Taken from Svc to Allow Installation of Design Change.Caused by Technician & Supervisor Error. Personnel Counseled

:on 851025,reactor Trip Signal Generated When Power Range Instruments Taken from Svc to Allow Installation of Design Change.Caused by Technician & Supervisor Error. Personnel Counseled

ML20151U041
Person / Time
Site:	Cook
Issue date:	01/31/1986
From:	Lauren Gibson, Will Smith INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	NRC OFFICE OF ADMINISTRATION (ADM)
References
LER-85-057, LER-85-57, NUDOCS 8602100448
Download: ML20151U041 (3)

LER-1985-057, on 851025,reactor Trip Signal Generated When Power Range Instruments Taken from Svc to Allow Installation of Design Change.Caused by Technician & Supervisor Error. Personnel Counseled

Event date:
Report date:
3151985057R00 - NRC Website

text

' NRC Pero ass U.S. NUCLEAR REGULATORY COMMMION APPROVED Osse NO 3186 4104 LICENSEE EVENT REPORT (LER)

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FACILITY NAASE til DOCKET NUMBER t2l PA8K G D. C. COOK NUCLEAR PLANT - UNIT 1 015101010131115 1lOFD l 2 TITLE tes REACTOR TRIP SIGNAL EVENT DATE (Si LER NUMSER IS)

REPORT DATE 171 OTHER FACILITIES $NVOLVED 18)

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MONTH DAY VEAR paCluYv mauss DOCKET NUMcERISI O15101010 1 I i 1l 0 2l5 8

5 8 l5 0l 5l 7 0l 1 d M l1 8l6 0 1 5 10 1 0 1 0 1 l I THIS REPORT is SueMITTED PURSUANT TO THE REQUIREMENTS OF 10 CPR {. (Chece sae es more of fee,e/fewett Ull CPE MTWO MODE 19) 4 20.402ft) 20 40Slal 30.734eH2Het 73.7116) y R

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NAME TELEPHONE NUMBER ARE A CODE L.

S. GIBSON - TECHNICAL ENGINEERING SUPERINTENDENT 6 11 16 416151-l5191Ol1 COMPLETE ONE LINE FOR E ACM COMPONENT F AILURE DESCRISED IN TMt8 REPORT (133

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THIS LER IS BEING RESUBMITTED TO CORRECT THE DESCRIPTION OF THE SEQUENCE OF EVENTS LEADING TO THE REACTOR TRIP.

ON OCTOBER 25, J985, AT 0850 HOURS WITH THE UNIT IN HOT SHUTDOWN TWO OF FOUR POWER RANGE INSTRUMENTS WERE TAKEN FROM SERVICE BY REMOVING THE FUSES (IEEE/FU) TO ALLOW FOR INSTALLATION OF AN APPROVED DESIGN CHANGE.

THIS SATISFIED THE 2/4 COINCIDENCE REQUIRED TO DE-ENERGIZE THE DETECTOR HIGH VOLTAGE IN BOTH SOURCE RANGE CHANNELS THUS RENDERING THEM INOPERABLE.

TECHNICAL SPECIFICATION 3.3.1.1 TABLE 3.3-1 ITEM 6.B REQUIRES AT-LEAST ONE CHANNEL OPERABLE.

COMPLIANCE WITH SHUTDOWN MARGIN REQUIREMENTS WAS VERIFIED PER THE ASSOCIATED ACTION STATEMENT.

WITH 2/4 POWER RANGE CHANNELS INOPERABLE, A REACTOR TRIP SIGNAL WAS GENERATED ALTHOUGH THE REACTOR TRIP BREAKERS WERE OPEN AND NO EQUIPMENT WAS

- ACTUATED.

AT 0852 HOURS, THE FUSES WERE RE-INSTALLED IN THE POWER RANGE DRAWERS AND BOTH SOURCE RANGE CHANNEL DETECTOR HIGH VOLTAGES WERE RE-ENERGIZED.

THE INCIDENT WAS DUE TO PERSONNEL ERROR ON THE PART OF THE TECHNICIANS AND THE UNIT SUPERVISOR.

TO PREVENT RECURRENCE, ALL OF THE PERSONNEL INVOLVED HAVE BEEN COUNSELED ON THE IMPORTANCE OF THOROUGHLY RESEARCHING ALL POSSIBLE CONSEQUENCES OF THEIR ACTIONS.

THE HEALTH AND SAFETY OF THE PUBLIC WERE NOT AFFECTED.

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"'Jo',70 vEaa D. C. COOK PLANT - UNIT 1 0 lS l0 lo lo l 3l 115 81 5 0 l517 0 11 012 F 012 THIS LER IS BEING RESUBMITTED TO CORRECT THE DESCRIPTION OF THE SEQUENCE OF EVENTS LEADING TO THE REACTOR TRIP.

ON OCTOBER 25, 1985, AT 0850 HOURS WITH THE UNIT IN HOT SHUTDOWN TWO OF FOUR POWER RANGE INSTRUMENTS WERE TAKEN FROM SERVICE BY REMOVING THE FUSES (IEEE/FU) TO ALLOW FOR INSTALLATION OF AN APPROVED DESIGN CHANGE.

THIS SATISFIED THE 2/4 COINCIDENCE REQUIRED TO DE-ENERGIZE THE DETECTOR HIGH VOLTAGE IN BOTH SOURCE RANGE CHANNELS THUS RENDERING THEM INOPERABLE.

TECHNICAL SPECIFICATION 3.3.1.1 TABLE 3.3-1 ITEM 6.B REQUIRES AT LEAST ONE CHANNEL OPERABLE.

COMPLIANCE WITH SHUTDOWN MARGIN REQUIREMENTS WAS VERIFIED PER THE ASSOCIATED ACTION STATEMENT.

WITH 2/4 POWER RANGE CHANNELS INOPERABLE, A REACTOR TRIP SIGNAL WAS. GENERATED ALTHOUGH THE REACTOR TRIP BREAKERS WERE OPEN AND NO EQUIPMENT WAS ACTUATED.

AT 0852 HOURS, THE FUSES WERE RE-INSTALLED IN THE POWER RANGE DRAWERS AND BOTH SOURCE RANGE CHANNEL DETECTOR HIGH VOLTAGES WERE RE-ENERGIZED.

THE INCIDENT WAS DUE TO PERSONNEL ERROR ON THE PART OF THE TECHNICIANS AND THE UNIT SUPERVISOR.

PERMISSION TO REMOVE TWO OF FOUR POWER RANGE INSTRUMENTS FROM SERVICE WAS REQUESTED BY THE TECHNICIANS AND GRANTED BY THE UNIT SUPERVISOR.

THE TRIP SIGNAL WAS NOT ANTICIPATED.

THE PROCEDURE TO INSTALL THE DESIGN CHANGE DID NOT SPECIFICALLY ALLOW FOR NOR FORBID, PERFORMING THE INSTALLATION ON TWO INSTRUMENTS AT ONCE.

TO PREVENT RECURRENCE, ALL OF THE PERSONNEL INVOLVED HAVE BEEN COUNSELED ON THE IMPORTANCE OF THOROUGHLY RESEARCHING ALL j

POSSIBLE CONSEQUENCES OF THEIR ACTIONS.

l THE HEALTH AND SAFETY OF THE PUBLIC WERE NOT AFFECTED.

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. (_,,,,,,,. ING MA & MICHIGAN ELECTRIC COMPANY DONALD C. COOK NUCLEAR PLANT P.O. Box 458, Bridgman, Michigan 49106 (616) 4654901 January 31, 1986

' United' States Nuclear Regulatory Commission Document Control Desk Washington, D.C.

20555 Operating License DPR-58

- Docket No. 50-315 Document Control Manager In-accordance with the criteria established by 10CFR50.73 entitled Licensee Event Reporting System, the following report /s are being submitted:

RO '85-057-1

< Sincerely, v0'/YYON-'

W.G.. Smith, Jr.

' Plant Manager

/cbm Attachment

- cc:- John E. Dolan-J.G. Keppler, RO:III M.P. Alexich

R.F. Kroeger H.B.-Brugger-R.W. Jurgensen NRC Resident Inspector R.C. Callen, MPSC

?'-

G. Charnoff, Esq.

'D.-Hahn.

INPO PNSRC~

4 A.A.

Blind Dottie Sherraan, ANI Library

- File

• I.I i

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