05000321/LER-1979-094, Forwards LER 79-094/03L-0

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Forwards LER 79-094/03L-0
ML19290B910
Person / Time
Site: Hatch Southern Nuclear icon.png
Issue date: 12/07/1979
From: Manry M
GEORGIA POWER CO.
To: James O'Reilly
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19290B911 List:
References
NUDOCS 7912140429
Download: ML19290B910 (1)
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LER-1979-094, Forwards LER 79-094/03L-0
Event date:
Report date:
3211979094R00 - NRC Website
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bCilll.'I'l l\\ h\\ CT te at HmNecurrant Decer.he r 07, 1979 PM-79-1093 PLtNT E. I. HATCH Licensee Event Kcport Docket No. 50-321 United States Nuclear Regulatory Qr. mission Office of Inspection and Enforcement Region II Suite 3100 101 Marietta Street Atlanta, Georgia 30303 ATTCiTION:

Mr. James P. O'Reilly Pursuant to Section 6.9.1.9.b of Hatch Unit I Technical Specifications, please find attached Reportable Occurrence Report No. 50-321/1979-94 i

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kST.'l r udry-g Plant Managet/

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J. H. Miller, Jr.

R. J. Kelly W. A. Widner C. L. Coggin R. D. Bake r Control Room File 7 91214 0 SM

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  • l-tug 13. IT1.uit Se rnice Water Pump. In servtce l w rc a t i rn in d i v t s t o:i t r or the P l.c.

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F TTJ I a l ov o r-o 4 in the contr.21 room.

IP41-C001D was idle in thi:s toop.ind was immediately placed l

in service and the pressure returned to normal. Abon icventigation it was noted that l o.,

havn any discharge pretsure or flow on local l

gQ8 t b " B" p ur'iv a s running but did no a

o, l gauges. The "B" pump was declared inoperable and a limitirrg condition for operation l DTT71 I van established per Tech Specs section 4.5.J.2.b.

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Ja Je 31 Ag 46 43 ga e4 og CAUSE DESCRIPil0N ANDCORRECTIVE ACTIONS 27 i o l During disasser:bly of the pump, it was discovered that the !ine bottom shaf t had l

lTTT1 I twisted into.

It was also noted that the suction bell beamig showed evidence of I

ITT'f] I galling. However it is not believed that this caused the staf t failure. A section l

, 3 l of the broken shaft is being sent to a Meta 11untcal Lab to try to determine the l

JTTT) l cause of the failure. The shaf t and suction belj ' nearing wee replaced and the (cont) J e w n

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lleport..ble Occurreace 1:epor t.';o. SU-J.' l / l') / ')-9 '..

1:ve nt th r.cript ion and Probable Con accuences (cont) not af fect ed by thi; incident. I previoas failure of this nature on another plant service water pump occurred on l'thruarj 19, 1976.

't h is failuie was reported un L13t.;o. 50-321/1976-15.

Cause Description and Corrective Action (cont) purnp was reasser. bled to vendors specifications. The pur.,p was placed back in se rvice on ';averber 26, 19 79 and 11:&l-3182, Plan t Service Uater Operability Test, was performed satisfactorily.

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llaxley, Cesrr,Ia 31513 Pc;.1t..ih..: t. c r. n. c lupoti No. M-321/19/>-94 On k't.f.w. ' r, !'ev

'. e r 21, 19 79, with t he reactor in t':e run mmte it 1001 KJL and It'41-Cldlu, Plant Service k'ater Punp, in service,a leu pressure alar:a in divisica 11 of the Plant Survice 'Jater syste: w.m received in the control room.

IP41-C00lD was idle in this loop and uas in. mediately placed in service. This resulted in the pressure returning to normal.

Upon invca:ti;;ation it was noted that the "B" pump was running, but had no discharge pressure or flow. The "B" purap was declared inoperable and a limitin;; cot..iition for operation was established per Tech Spec section 4.5.J.2.b.

This cendi tion did not trinder the continued operatica of the plant.

During disassembly of the pump, it was discovered that the line bottom shaf t had twisted into.

It was also noted that the suction bell bearing showed signs of galling. Ilowever, it is not believed that this condtion caused the shaft failure.

The shaf t and suction bell bearing were replaced and the pump was reassembled to vendors specifications. The pump was placed back in service on November 26, 1973 and HNP-1-3182, Plant Service Water Operability Test, was perforced satisfactorily.

A section of the broken shaf t is being sent to a metallurgical lab to try to detereitic the cause of the shaf t f ailure. A follow up report will be submitted when the cause for tae shaf t failure has been determined.

Af ter reviewing the history of maintenance on Plant Service Water Pumps, the only sinilar event found was reported on February 19, 1976 on LER No. 50-321/1976-15. This shaft f ailure was due to a catallic flaw in the shaft.

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CCDfj',i!l\\)',',er r e.m i iw ".: c,, r: ant De cembe r 07, 1979 P.M-79-1093

,PLV;T E. I. HATCH

'.icensee Event Kcport Docket No. 50-321 United States Nuclear Regulatory Q: mission Office of Inspection and Enforcecent Regica Il Suite 3100 101 '.arietta St reet Atlanta, Georgia 30303 ATTENTION:

P.r. James P. O'Reilly Pursuant to Section 6.9.1.9.b of Hatch Unit I Technical Specificaticas, please find attached Reportable Occurrence Report No. 50-321/1979-94.

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Plant Manageu RT5/mla xc:

J. H. Miller, J r.

R. J. Kelly W. A. Widner C. L. Cocr.in R. D. Daker Control Room File 1579 115 S

7 93 214 0 f 2 7 5

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