ML19344D231

Revised LER 79-018/03L-1:on 780208,during Diesel Generator Monthly Test,Diesel Generator 1-1 Made Unusual Noises.Caused by Roller Clutch Failure in Turbocharger.Diesel Generator 1-1 Turbocharger Replaced

ML19344D231
Person / Time
Site:	Davis Besse
Issue date:	03/07/1978
From:	Hartigan J TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19344D230	List: ML19344D228 ML19344D231
References
LER-79-018-03L, LER-79-18-3L, NUDOCS 8003110567
Download: ML19344D231 (3)

Text

• U. S. NUCLEAR REGUL ATORY COamtlSSION

'c FORM 3G6 m " - LICENSEE EVENT REPORT cONTROt. 0 LOCK: l 1

l l l l l \h 15 (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) l l@

l t l9. l 0 l H l D l B l S l 1 l@l'0 l 0 l - l 6 l 0 l N l P lLICENSE 8 LICENSEE CCOE 14 15 vCENSE NUMSEH 25 26 F l-TYPE l 0JJl 3$1l@l CAT 68 4-l 1 l 1 l 1 wT lil 8 "'I[RC l L hl630]5l0l-l0l3l4l6l@l0l2l0]8]7(8l@l013l0l7 o

60 DoCKLT NUMSER 68 63 EVENT DATE 74 75 REPORT D ATE 80 EVENT DESCAIPTION AND PROBABLE CONSEQUENCES h 121lOn 2/8/78, while nerforming the " Diesel Generator (DG) Monthlv Test'! it was noticed I Investigation determined the noise was comine I

[3; l that DG l-1 was making unusual noises.

14 l l from the turbocharger. It was suspected the turbocharger reliability was inadeauate I in Action Statement l is;land DG l-1 was declared inoperable at 1245 hours0.0144 days <br />0.346 hours <br />0.00206 weeks <br />4.737225e-4 months <br /> placing the unit There was_.]

, l s ; l A of TS 3.8.1.1, ihich requires two independent DG in Modes 1. 2. 3 and 4 personnel. DG l-2 was l 3 l 7 l l no danger to the health and safety of the public or to unit

d. (NP-33-78-21) l 3,all operable if a loss of all normal power supplies had occurre 80 COMPONENT CODE SUSC dE SU E DE CODE S BC DE ,

. 31 l E l B l @ y@ l B l @ l B i Ll O l W l E l 18R']h W@ 13

[20Z,_j h 12 13 PEVIStoN 8 9 10 11 REPORT SEOUENTIAL OCCURRENCE No.

TYPE CoOE m

REPORT NO.

Ogg LERIRO EVENT YEAR 17181 l---I 101118 g 27 10 3i 28 23 itl 30

[ --J Ji 32 21 22 23 24 26 F R1 S. SUPP'. t MA F CT PER HOURS SB 1 o PL NT U@

O MET K A l el 01010!40* Lx]@ LyJ@ l448 l 61.8 I s47 lG I33cl@L7J@ 71 LzJ@

35 l36 zl@ 31 41 42 43 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS to ,

i,37] lThe apparent cause of the occurrence was determined by the vendor, Power Systems.

! DG l-1 turbocharger was replaced

.,,,)lbe a roller clutch failure in the turbocharger.

i Diesel l

. l under work order 78-324 under the supervision of the vendor representative.

j l Generator Monthly Test was satisfactorily completed, and DG l-1 was declared operable l

, g ,,at 1420 hours0.0164 days <br />0.394 hours <br />0.00235 weeks <br />5.4031e-4 months <br /> on February 10, 1978. 83 8 g ISCG RY OtScoVERY DESCRIPTION

% POWER OTHER STATUS ST S l

1 15 l y@ l 0l 7 l 4 l@l NA l l B l@l Surveillance Test ST 5081.01 I A TIVITY CO TENT LOCATION OF RELE ASE f r.ELEASED OF ' LEASE AMOUNT oF ACTIVITY l I NA l l NA i I68 l9l Z l @ J@l 80 '

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PERSONNEL EXPOSURES '

NUMSER TYPE DESCRIPTION l i t I 1010 l 0 l@l Z l@l NA

' ' PERSONNEi.'iN;uLS l t

NuMeER DESCmPTiON@ l NA ii la l l 0 l 0 l 0 l@l12 80 7 8 9 11 LOSS OF oR oAMAGE TO FACILITY TYPE DESCRIPTION 8 0 03110 76^/ l

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$ i 191 8 t W@l10NA NRC USE ONLY 7

• PUO LICITY ISSUED DESCRIPTION I i l111I1ll11111 80 ;

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. John Hartican PHONE: (419) 259-5000 Ext. 250{

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GE TOLED0' EDISON COMPANY DAVIS-BESSE UNIT ONE - NUCLEAR POWER STATION

-SUPFLEMEtTTAL INFORMATION FOR LER NP-33-78-21

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DATE OF EVENT: . February 8, 1978

' FACILITY: Davis-Besse Unit l' - . . .

IDENTIFICATION OF' OCCURRENCE: Replacement of Diesel Generator (DG) 1-1 turbo--

, <: charger due'to anticipated failure. .

Conditions Prior to Occurrence: The unit was in Mode 1, with' Power (HWT) = 2060, and Load-(MWE) = 730.

Description'of Occurrence: On February 8, 1978, while performing Surveillance Test ST. 5081.01, " Diesel-Cenerator Monthly Test", Operations personnel noticed Ethat Diesel Cenerator (DC) 1-1 was making unusual noises which appeared to be originating from an air start motor. On further investigation by Maintenance personnel, fit vas. determined that'the noise was coming from the turbocharger, j

The turbocharger puts more-air'into the diesel cylinders allowing better effi-ciency and higher horsepower. On a loss of the turbocharger, the diesel would

- .not be able to reach full ~1oad power requirements. It was suspected the turbo-

< charger reliability was inadequate and the. Shift Foreman declared Diesel Genera-tor 1-1' inoperable at 1245, hours. This.placed the unit in Action Statement "A"

of Technical . Specification 3.8.1.1, which requires

two independent Diesel Cencra- ,

tors in' Mode's 1,J2, 3 and 4. Operations personnel test started Diesel Generator 1-2 Eand performed : Surveillance Test ST 5080.01, "Of fsite AC Sources" as required by the Action Statement throughout the occurrence.

Designation'of Apparent Cause of Occurrence: The turbocharger was sent back to-

.the vendor, Power. Systems, where-an investigation and analysis were made. It

.showed .that the fprimary cause of the' malfunction was a roller clutch failure. The al failure.was due to an overload condition of the clutch which could have been due to loading during acceleration and/or running at a no load rated speed for long

- , periods of time.

-Analysis of Occurrence: .There was no danger to the health and safety of the public '

.or to tation personnel. Diesel Generator 1-2 was operable if a loss'of normal power su'ppliesihad occurred.

r

' Corrective? Action: 'The vendor, Power Systems, was contacted and it was decided to replace .the . turbocharger.: A service representative was 'sent to the site.

' Diesel"Cene'rator 1-1 turbocharger'was replaced'under Maintenance Work Order  !78-324 under'the supervision of-a' vendor representative'. Surveillance Test-LST 5081.01, " Diesel Generator Monthly. Test" was completed satisfactorily and-

Diesel Cenerator 1-1.was declared operable at'1420 hour0.0164 days <br />0.394 hours <br />0.00235 weeks <br />5.4031e-4 months <br />sJon February' 10,11978, E

removing the' unit:from Action" Statement A'of Technical Specification 3.8.1.1.

iTheimalfunction and'its' probable causes, as determined by vendor analysis, should

• 1 not~ happen per'our present~SP!1107.11, Diesel Generator. Operating Procedure. Pro-

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1 ' cedur'e control's.'now prevent. operation' that' would' be detrimental to. the turbocharger.

" LPower' Engineering'is. evaluating Power Systems'.proposalito increase the reliability ,

. Soffthe'tu'rbocharger.

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DAVIS-BESSE UNIT ONE NUCLEAR POWER' STATION SUPPLEMENTAL INFORMATION FOR LER NP-33-78 PAGE 2

. Failure Data: There have been no previous reportable turbocharger failures.

LER #78-018 L

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