ML20011D228

LER 89-026-01:on 890629,emergency Diesel Generator 1B Failed post-maint Test & Could Not Be Returned to Svc within Time Allowed by Tech Specs.Caused by Rotor Not Turning.Crankcase Vapor Ejector cleaned.W/891215 Ltr

ML20011D228
Person / Time
Site:	Crystal River
Issue date:	12/15/1989
From:	Moffatt L, Widell R FLORIDA POWER CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
3F1289-10, LER-89-026, LER-89-26, NUDOCS 8912260015
Download: ML20011D228 (4)

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-t C 0 04 P O R A T 4 O N nonenhar 15, 1989 3F1289-10 U. S. Nuclear Regulatory Camission Attention: Docupant Control Desk Washington, D. C. 20555

Subject:

Crystal River Unit 3 Docket No. 50-302 Operating License No. DPR-72 Licensee Event Report No. 89-026-01

Dear Sir:

Enclosed is a supplement to Licensee Event Report (IER)89-026 which was previously submitted in accordance with 10 CFR 50.73.

Should there be any questions, please contact this office.

,very truly yours, 1

h i

Roli C. Widel Dira~., tor, Nuclear Operations Site Support WIR:Inag Enclosure xc: Regional Administrator, Region II Senior Resit%nt Inspector '

kR h00CK0500I3, 991213 ,

S Q2-W t t

. GENERAL OFFICE: 3201 Thirty fourth Street South

• P.O. Box 14042

• St. Petersburg, Florloa 33733 * (813) 866 5151 i

A Florida Progress Company

4 o U.S. kvCL E03 % 4 A vtaf OWY COMMIEEION N.R.C. FORM . 306 4.PPROy$D OMB NO. 31f60104 E RPORi$ 4f30'97 ESTIMAf tD BufsDEN PER RESPON$f TO COMPLY WTH THl3 LICENSEE EVENT REPORT (LER) SIuMt"#Ts'Uo*ARdfo'fu'Ro"#Es'#J/T"Ut RECin"S M v"J?O,lv'e"OMJ,ill%"!d"'I M "o! A "fJJ'"

THE PAPERWDRK Rf DUCTION PROJECT 0160 01041 OF FICE OF MANAGEMENT AND bud 0f f,WA$HINGTON.DC 205o3.

1. ACILITY NAus t1) DOCEET NUMenn 01 PAGE @

CRYSTAL RIVER UNIT #3 0 l5 l 0 l0 l 0 l3 l0 l2 1 ]c'l 0 l3_

h'* Inability to Repair Emergency Dierel Generator Within Time Allowed by Action Statement Results in Shutdown Required by Technical Specifications (VENT DATE 191 LtR NvMBER (Si REPORT DAf f (71 OTHE R 9 ACILITIE S INVOLVED (St MONTH DAY YEAR YEAR 5'(% '"' 0'fy",'$ MONTH Day vEAR ' AC' LIT v N AMt s DOcstti NUMetRtsi N/A 0l5l0l0l0; l l

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0l6 2l9 89 8l9 0l 2 l6 0 l1 1l2 1 l5 8l9 N/A 0 l5l0 l0 1 0g l l o,,,,,,,, tHis RtPORt es aveMirTED PvRouANT to THE RaouimtMENTs Or io CsR I <Caua w

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to ao64.H1 H.I to.73i.H2Hdi) to 73t.i(2nal LICENStt CONT ACT FOR THIS LIR 1171 Nivt TELEPHONE NvMBER L. W. MOFFATT, NUCLEAR SAFETY SUPERVISOR ""'"*P' 9 I O l4 719 l5 l- 16 A 1816 COMPLETE ONE LINE FOR L ACH COMPONENT f AILumt DESCRittD IN THis REPORT (131 "fo$,I,'$fI n iA E CAuSE SYSTEM COMPONENT "* % "I' CAUSE SYST E M COMPON E NT MA%AC pp X EKI l l DIG F I Ol 10 1 Y I I i f l 1 I I l l I l l l 1 l l I I I l

[ SUPPLEMENT AL REPOR1 tXPECTED nel MONTH DAY vfAR SUBMISSION 4E S (19 v.s. temw.r. EXPECTED Syg6etSSION DATil NO l l l A. TxACT n -,r e m .u., .. ma rev n <i ,. .u. ,-,,,.. ,-.c i m On Jurms 29, 1989 Crystal River Unit 'Ihree was in OPERATIONAL MODE ONE (IWER OPERATION) AT 97% Power. Emergency Diesel Generator 1B had been out of service for maintenance since June 26 at 0650. 'Ibchnical Specification 3.8.1.1 action b had been initiated at that time. At 0300 plant shutdown was initiated because EGDG-1B could not be repaired in the time remaining in the action statement. An Unusual Event was declamd because the plant was conducting a  !

i shutdown required by Technical Specifications. OPERATIONAL MODE 'IHREE (HOT '

l STANDBY) was entered at 1142 on June 29, 1989. Cooldown was initiated and l OPERATIONAL LODE FIVE (CDID SHUrDOWN) was entered at 1722. 'Ihe Unusual Event was terminated at 1730.

)

! 'Ihe diesel generator failed the post maintenance test due to low crankcase I

vacuum. Inspection of the ttutochargers revealed one of the turbocharger rotors had not been turning. 'Ihis caused the low crankcase vacuum. 'Ihe

! 'Iurbochargers have been replaced. Turbochargers on the other diesel generator will be replaced. Procedures will be revised to provide for periodic inspection ard cleaning of turbochargers.

NRC Form 366 (649) i

NRC Ff9M 3ESA U S EUCLEM LE IULATORv COMMISSION (65 1.PPR0v$D OMS NO. 31500104 EKPCE$ W3092 L"Et','!lo*,f"R,""J'f*la*J',,Moc fW ,"o',".IM UCENSEE EVENT REPORT (LER)

TEXT CONTINUATlON C

"",',",L','f, ^n nig"f'." R23'hR u'"' WTN 1 P APE Rwo At i t'08J J 3 0 BC OF MANAGEMENT AND puDGET,W ASHINGTON.DC 20603.

F ACILIT V NAML m DOCE&T NUMBER (28 g gg

'N CRYSTAL RIVER UNIT 3 o l5 l0 l 0 l 0 l 3 l0 l 2 8l9 -

0 l2 l6 -

0 l1 0l2 0F 0p rixT rn -.m < me w mm nn EVDir DESCRIPI1QN On June 29, 1989 Crystal River Unit Three was in OPERATIGE } ODE 1 (POWER OPERATION), at 97% Power. Emergeary Diesel Generator 1B (D3DG-1B) (EK,DG) had been out of service since 0650 June 26, 1989 when it was removed frcan service for investigation of a decreasing trend in crankcase vacuum. This trend had been detected over the last several times that the diesel had been operated.

Action b of Technical Specification 3.8.1.1 had been entered at that time. At 0200 on June 29, 1989 EDG-1B failed the post maintenance test, and could not l be returned to service. This left less than five hours of the 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> allowed j by the action str.tement, j l

At 0300 on June 29, 1989 a plant shutdown was initiated due to the inability to  !

repair mDG-1B in the time remaining in the action statement. At that time, l the Shift Supervisor (Senior licensed Utility Personnel) entered an Unusual Event, as required by the Radiological Emergerry Response Plan. At 1142 on June 29, 1989, the plant entered OPERATIGE } ODE THREE (IUP STANDBY).

Cooldown and depressurization were initiated in order to be in OPERATIO!E ! ODE FIVE (CDID SIUrDOWN) within the time requirement of the action statement.

On June 30, 1989 at 1355 the plant entered OPERATIONAL LODE ITUR (Hof SIUfDOWN) . Cboldown continued and at 1722 the plant entered OPERATIONAL ! ODE FIVE (001D SIUIDOWN) . In this mode Technical Specification 3.8.1.1 is no longer applicable. Technical Specification 3.8.1.2 becomes applicable in l OPERATIONAL PODE FIVE. This Specification only requires one diesel generator

, arxi one offsite power source to be operable. This Specification was met; therefore, the Unurual Event was terminated at 1730. This constituted completion of a shutdown required by Technical Specifications and this event is being reported pursuant to 10CFR50.73,a.2.i.B 1

D3DG-1B was manufactured by Fairbanks Horse. It is a model 38TD8 1/8 X10 OP.

EVDTP ANALYSIS I The applicable action statement of Technical Specifications was complied with.

l Numerous additional failures would have been r-wy before the plant reached a condition in which control of fission product barriers would have been lost.

Therefore, this event did not impact the health and safety of the general public.

CAUSE

. The two turbochargers were sent to the equipacnt supplier for failure analysis.

l The supplier determined the rotor of one of the turbochargers had not been turning. This would explain the loss of crankcase vacuum. No evidence of why the turbocharger stopped turning could be found.

1 NRC f are 306A (649)

FonM 306A U.S. NUCLEG kt sV4TDMV CotAMISSION ,

. . tXPl%ES 4?3042 Ll",21'RO,f!8@f?TJ'58"M,' "

.0C f"P.' 70."d"'$

. UCENSEE EVENT REPORT (LER)

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TEXT CONTINUATION C#4",'O' %"MA?!M CE@'."i"C,7*,'h!, '".'fiMfifd 1 P APE RWO RE T SON R J (3 $0 [O IC OF MANAGEMENT AND BUDGET, WASHINGTON, DC 20603 F CILITV NAME (1) DOCILET NUMBEM (21 ggn wyu.gm 166 PAGE(31

" Aa "tt.Mt' 3*.?:

CRYSTAL RIVER UNIT 3 o ls l0 lo lo ] 3l0 l2 8 l9 -

0 l2 l6 _

0 l1 0 l3 or 0 l3 Text m . w. , =c % .ime., nn CORRECTIVE ACTION l

'Ibe crankcase vapor ejector ard its associated tubing and oil separator have )

been cleaned ard tested satisfactorily. 'Ibe supert:harger blower (EK,MO) ard both turbochargers (EK,EO) were replaced. Following these activities )

surveillance testing of the diesel generator was successfully acomplished. )

'Ihe new turbochargers are of a different size than the one which s*W turniry. 'Ibe turbo::hargers on the other diesel generator will be replaced with the new design in an twming refueling outage. Plant procedures will be revised to include periodic inspection and cleaning of diesel generator turbochargers.

PREVIOUS SIMILAR EVERPS No previous events in which decreasing crankcase vacuum caused a diesel generator to W inoperable were fourd.

l NRC Fenn asSA (6491

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