ML20086D990

Part 21 Rept Re Two Failures of Model Vtr 500 Turbochargers Supplied by Abb Turbo Systems Ltd.Failure of Turbocharger Renders Associated EDG Incapable of Providing Rated Output. Seventeen Hole Jet Assist Wall Plates Replaced

ML20086D990
Person / Time
Site:	Mcguire, McGuire
Issue date:	07/03/1995
From:	Mcmeekin T DUKE POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
REF-PT21-95 NUDOCS 9507110099
Download: ML20086D990 (8)

Text

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l' . DukeIbwerCompany . .

T C McMrmv McGuireNudearGenerationDepartment . bicePresident

' 12700HagersferryRoad(MG01VP) (TM)8754800 Huntersaille, NC280784985 ~ (704)8754809 Fax g gg .

DATE: July 3,1995 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555 t

Subject:

- McGuire Nuclear Station Unit 1 and 2 Problem investigation Process No.: 2-M95-1104,2-M95-1225, and 1 M95-1244 i

Gentlemen: l Pursuant to 10 CFR 21, attached is a notification of failure of Model VTR 500 turbochargers supplied by ABB Turbo Systems Ltd. A written report will be submitted per 10 CFR 50.73 requirements.

Very truly yours, N

T.C. McMeekin

-l RJD/bcb Attachment cc: Mr. S.D. Ebneter INPO Records Center Administrator, Region 11 Suite 1500 U.S. Nuclear Regulatory Commission 1100 Circle 75 Parkway 101 Marietta St., NW, Suite 2900 Atlanta, GA 30339 Atlanta, GA 30323 Mr. Victor Nerses Mr. George Maxwell -

U.S. Nuclear Regulatory Commission NRC Resident inspector Office of Nuclear Reactor Regulation McGuire Nuclear Station

.. Washington, D.C. 20555 110C51 9507110099 950703 PDR ADOCK 05000369 S PDR .,

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B.L Walsh (EC11C)

,- Zack Taylor (CNS)  !

G.A. Copp (EC050) ,

J.l. Glenn (MG02ME)  ;

P.R. Herran (MG01VP)

R.C. Norcutt (MG01WC)

S.G. Benesole (ONS Reg Compliance)

G.H. Savage (EC06E) l G.B. Swindlehurst (EC11-0842)-

M.S. Tuckman (EC07H)

R.F. Cole (EC05N)

D.B. Cook (EC13A)

Tim Becker (PB02L)

P.M. Abraham (EC081)

Bruce Caldwell(MG01VP)

L.V. Wilkie (ONO3SR)

D.P. Kimball (CN05SR)

NSRB Support Staff (EC05N)

Kay Crane (MG01RC)

Rich Casler(ECOSN) i t

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m r DUKE POWER COMPANY ~

McGUIRE NUCLEAR STATION

'Date Of Notification:

1.

July 3,1995

. Problem identified By:

Duke Power Company -

422 South Church Street Charlotte, NC 28242 Facility:

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McGuire Nuclear Station 12700 Hagers Ferry Road Huntersville, NC 28078-3744 Basic Component:

Model VTR 500 Turbocharger

' Supplier:

ABB Turbo Systems LTD.

Haseistrasse 16 5401 Baden / Switzerland Nature Of Defect:

Duke Power Company, McGuire Nuclear Station (MNS), has experienced two (2) failures of Model VTR 500 turbochargers supplied by ABB Turbo Systems Ltd. These turbochargers were dedicated as a commercial grade item, and were approved and installed as an acceptable substitute on all four (4) MNS Nordberg Emergency Diesel Generators (EDGs). Failure of the turbocharger renders the associated EDG incapable of providing the rated output.-

Duke Power Company has determined fatigue failure of the compressor wheel can occur when using a seventeen (17) hole jet assist wall plate, if the turbocharger is operated at speeds which can produce resonance.

Date information Obtained:

July 2,1995 Other Facilities With Subject Component:

To the knowledge of Duke Power Company the only known installed Model VTR 500 is at Indiana

/ Michigan Power Company's D C. Cook plant. One additional unit is on order for use at Carolina Power and Light's Brunswick plant. Both plants have been verbally notified of this problem.

Since the turbochargers in question were installed as commercially dedicated parts, other examples may exist within the industry.

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DUKE POWER COMPANY

' McGUlRE NUCLEAR STATION v

- Corrective Actions:

' McGuire Nuclear. Station has replaced the seventeen hole jet assist wall plates with wall plates of either a slotted or blank configuration. The compressor wheel in all four MNS EDGs were also replaced. -

Contact Ricky J. Deese, Safety Review Manager, McGuire Nuclear Station if additional information is required.

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. // .- y POWER REACTOR , EVENT NUMBER: -29016 FACINITY:.MCGUIRE REGION: 2 NOTIFICATION DATE: .07/03/95' UNIT:- [1] [2] [] STATE: NC. NOTIFICATION TIME: 14:08 [ET)

RXzTYPE: [1] W-4-LP, [2] W-4-LP EVENT DATE: 07/03/95 EVENT TIME: 14 : 02 [EDT]

NRC NOTIFIED'BY: P. T. VU- LAST UPDATE DATE: 07/03/95~

HQ' OPS OFFICER: LEIGH TROCINE NOTIFICATIONS EMERGENCY CLASS: NOT APPLICABLE 10 CFR"SECTION:

CDEGl 31. 21 (c) (3 ) (i) DEFECTS / NONCOMPLIANCE VERN HODGE NRR BETH WETZEL NRRL KEN BROCKMAN 'AEOD UNIT SCRAM CODE RX CRIT INIT PWR INIT RX MODE CURR PWR CURR RX MODE.

'l N N O HOT STANDBY 0 HOT STANDBY 2 N Y 100 POWER OPERATION 100 POWER OPERATION' EVENT TEXT 10 CFR PART 21 NOTIFICATION REGARDING THE FAILURE OF EMERGENCY DIESEL GENERATOR MODEL VTR 500 TURBOCHARGERS SUPPLIED BY ABB TURBO SYSTEMS LTD.

ON JULY'2, 1995, THE LICENSEE DETERMINED THAT FATIGUE FAILURE OF THE COMPRESSOR WHEEL CAN OCCUR WHEN USING A 17-HOLE JET ASSIST PLATE IF THE-TURBOCHARGER IS OPERATED AT SPEEDS WHICH CAN PRODUCE RESONANCE. THE

. LICENSEE HAS EXPERIENCED TWO FAILURES OF MODEL VTR 500'TURBOCHARGERS.

SUPPLIED BY ABB TURBO SYSTEMS LTD. (REFER TO EVENT NOTIFICATION NUMBER 28997.).'THESE TURBOCHARGERS WERE DEDICATED AS. COMMERCIAL-GRADE ITEMS AND WERE APPROVED AND INSTALLED AS AN ACCEPTABLE SUBSTITUTE ON ALL FOUR MNS NORDBERG EMERGENCY DIESEL GENERATORS. FAILURE OF THE-TURBOCHARGER RENDERS THE ASSOCIATED EMERGENCY DIESEL GENERATOR INCAPABLE OF PROVIDING THE: RATED OUTPUT.

IN ORDER TO' CORRECT THIS PROBLEM, THE-LICENSEE REPLACED THE.17-HOLE JET RSSIST WALL PLATES WITH WALL PLATES OF EITHER A SLOTTED'OR. BLANK CONFIGURATION. THE LICENSEE ALSO REPLACED THE COMPRESSOR WHEELS IN ALL FOUR EMERGENCY DIESEL GENERATORS.

ITHE ONLY INSTALLED MODEL VTR 500 TURBOCHARGERS KNOWN TO THE LICENSEE ARE AT 1THE D. C. COOK PLANT. ONE ADDITIONAL UNIT IS ON ORDER FOR USE AT THE

-BRUNSWICK PLANT. BOTH PLANTS HAVE BEEN VERBALLY NOTIFIED BY THE LICENSEE.

.BECAUSE THE TUR.BOCHARGERS IN QUESTION WERE INSTALLED AS COMMERCIALLY' DEDICATED PARTS, OTHER EXAMPLES MAY EXIST WITHIN THE INDUSTRY.

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__- __ __ 3 l POWER REACTOR' ,

EVENT NUMBER: 28997 c

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! FACILITY: MCGUIRE . REGION: 2 KOTIFICATION DATE: 06/28/95 l UNIT: [1] -(2]L [] STATE: NC NOTIFICATION. TIME: 14:07-[ET]

! RX TYPE: [1] W-4 -LP, [2] W- 4 -- LP EVENT-DATE: .06/28/95 L EVENT TIME: 13 : 50 [EDT]

NRC NOTIFIED BY: DENNIS MCCORKEL LAST UPDATE DATE: '07/01/95 j HQ OPS OFFICER: DOUG WEAVER

( NOTIFICATIONS  !

EMERGENCY CLASS:' UNUSUAL EVENT l L 10'CFR SECTION: BRUNO URYC RDO ,

AAEC 50.72 (a)-(1)'(i) EMERGENCY DECLARED BOB DENNIG- EO '

ASHU 50.72 (b) (1) (i) (A) PLANT S/D.REQD BY TS JOHN DAMICO FEMA l

l UNIT- SCRAM CODE RX CRIT INIT PWR INIT RX MODE CURR PWR -CURR RX MODE i 1 N Y 100 POWER OPERATION 100 POWER OPERATION.

2 N Y 100 POWER OPERATION 100 POWER' OPERATION i

EVENT TEXT 1

UNUSUAL' EVENT --ALL SITE EMERGENCY DIESEL GENERATORS DECLARED INOPERABLE ALL SITE EMERGENCY DIESEL GENERATORS (EDG) WERE' DECLARED INOPERABLE BASED ,

ON A: DESIGN FLAW IN THEIR TURBOCHARGERS. EACH UNIT HAS TWO EDGs. THE '2B

. j EDGLIS TAGGED OUT AND UNAVAILABLE-(THE TURBOCHARGER FAILED ON THIS EDG), '

THE OTHER THREE EDGs ARE AVAILABLE. ALL OTHER SAFETY SYSTEMS AND OFFSITE POWER SOURCES ARE OPERABLE. 1 THE UNUSUAL EVENT WAS DECLARED AT 1350. THE LICENSEE ENTERED'. TECH SPEC 3.0.3 AT THE SAME TIME. BOTH UNITS MUST BE IN MODE 3 WITHIN 7. HOURS OF )

DECLARATION (2050) AI4D MODE 5 WITHIN AN ADDITIONAL 30 HOURS. >

l -THE EDGs WERE MANUFACTURED BY NORDBERG, AND THE TURBOCHARGERS WERE MADE BY

.ABB. THE INVESTIGATION IS FOCUSING ON A DESIGN FLAW THAT INCREASES.THE' TURBULENCE'OF THE INTAKE AIR STREAM IN THE TURBOCHARGER.-

THE LICENSEE NOTIFIED APPROPRIATE STATE AND LOCAL OFFICIALS ~AS WELL AS THE NRC RESIDENT INSPECTOR.

.* *"* UPDATE AT 1850 ON 6/28/95 BY MCCORKEL TAKEN BY WEAVER * *

• l l UNIT 1 IS IN MODE 3. ENFORCEMENT DISCRETION HAS BEEN GRANTED FOR UNIT 2.

THE LICENSEE HAS 34 HOURS.TO COMPLETE THE REPAIRS ON THE '2B' EDG. UPON COMPLETION OF REPAIRS TO THE '2B' EDG, THE LICENSEE MILL BE IN A 72-HOUR I LCO WITH ONLY THE '2A' -EDG INOPERABLE ON UNIT 2. POWER DESCENT ON UNIT 2  !

WAS STOPPED AT 30%. POWER WILL BE INCREASED TO 45% ON UNIT 2 & HELD THERE.

i HOO NOTIFIED R2DO (URYC) AND NRR EO (SPESSARD). I (Continued on next page) l- l l , _ _ ,.

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FACILITY: MCGUIRE = = ~ " PAGE # 2 OF EVENT NUMBER: 28997

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• UPDATE AT 0751 ON 06/29/95 BY SARRATT TAKEN BY KARSCH * *

• THE LICENSEE TERMINATED THE UNUSUAL EVENT FOR UNIT 2 AT 0740 EDT ON 06/29/95 BY RETURNING THE "2B" EDG TO OPERABILITY. A NEW DESIGN DIFFUSER PLATE WAS INSTALLED IN THE TURBOCHARGER TO BLANK OFF THE TURBULENCE. THE DISCRETIONARY ENFORCEMENT HAS BEEN TERMINATED. UNIT 2 IS IN A 72-HOUR LCO WHICH STARTED AT 1350 EDT ON 06/28/95 FOR THE "2A" EDG. THE LICENSEE INFORMED THE NRC RESIDENT INSPECTOR. HOO NOTIFIED R2DO (URYC), NRR EO (DENNIG), AND FEMA (WITSBERGER).

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• UPDATE AT 0436 ON 07/01/95 BY McALLISTER TAKEN BY HOO JOLLIFFE * * * ,

AT 0415 ON 07/01/95, LICENSEE TERMINATED THE UNUSUAL EVENT ON UNIT 1 AFTER RESTORING EDG #1A TO OPERABLE STATUS; EDG #1B IS STILL INOPERABLE.

LICENSEE NOTIFIED THE NRC RESIDENT INSPECTOR AND STATE AND LOCAL OFFICIALS OF THE TERMINATION OF THE UNUSUAL EVENT ON UNIT 1. HOO NOTIFIED R2DO URYC, NRR EO SPESSARD, AND FEMA SIMMERS.

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,i Date Power Company -< (704)87S 4000

AlcCoire Nacicar Station *

!!!00 l{ apes l'erry Road

'Huawesville. NC 23073-2985 l //

OUKEPOWER

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CRIFICATION NUMBERS: (704) 875-4000 or 8-875-4000 (microwave) I WETY. REVIEW GROUP / COMPLIANCE TELECOPIER f: (704) 875-4279 3LECOPY OPERATOR INSTRUCTIONS: ASAP RUSH CONFIDENTIAL I l

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