ML19319E566

RO 50-313/77-03:on 770122,steam Driven Emergency Feedwater Pump P-7A Bearings Began to Smoke Following Surveillance Test & Pump Shutdown.Caused by Component Failure.Bearings Replaced

ML19319E566
Person / Time
Site:	Arkansas Nuclear
Issue date:	02/15/1977
From:	Mardis D ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML19319E556	List: ML19319E555 ML19319E560 ML19319E566
References
NUDOCS 8004110821
Download: ML19319E566 (4)

Text

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1. Reportable Occurrence Report No. 50-313/77-3 *

2. Report Date: 2/15/77 3. Occurrence Date: 1/22/77 4 Facility: Arkansas Nucicar One-Unit 1 Russellville, Arkansas

5. Identification of Occurrence: Bearing failures of steam driven ' emergency

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feedwater pump P-7A.

6. Conditions Prior to Occurrence:

Steady-State Power X Reactor Power 950 MWth Hot Standby Net Output 290 MWe Cold Shutdown Percent of Full Power 37  %

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Refueling Shutdown Load Changes During Routine Power Operation (V) Routine Startup Operation Routine Shutdown Operation Other -(specify)

7. Description of Occurrence:

At approximately 0650 hours0.00752 days <br />0.181 hours <br />0.00107 weeks <br />2.47325e-4 months <br /> on January 22, 1977, a surveillance test was performed on the steam driven emergency feedwater pump (P-7A). After the pump.was shut down, the pump bearings starte'd td smoke. An investiga-tion of the pump bearings indicated that the thrust and sleeve bearings were bad. -

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NSP-I11-2, Rev. 5 Attachment "D" 5 October 1, 1976 Page 2 of 4 s

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Reportable Occurrence -Report $-

.. 50-313/77-3 -

8. Designation of Apparent Cause of Occurrence:

Design Procedure Manufacture Unusual Service Condition ~

Including Environmental Ins ~ta11ation/

Construction Component Failure X (See Failure Data) 5 Operator Other (specify)

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9. Analysis of Occurrence:

Since emergency feedwater pump P-7B was operable and has the capability necessary for cooldown, there was no hazard to the health and safety of the public.

n 'd October 1, 1976 NSP-III-2, Rev. 5 Attachment "D" 3 Page 3 Of 4 I

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Reportable Occurrence Report No. 50-313/77-3 .

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10. Cop ective Action:

A thrust bearing and sleeve bearing were replaced. A test was performed which indicated the pump's operation was satisfactory, f

11. Failure Data:

4 Terry Steam Turbine Company 1 Governor End Bearing Part No. E-1608-24 1 Main Ball Thrust Bearing Part No. E-1608-80 i

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October 1, 1976 33p-III-2, Rev. 5 Attacluaent "D" 5 Page 4 of 4 4

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