ML19326A113

LER 78-077/03L-0:on 780710,component Cooling Water Pump Vibration Readings Exceeded Max Limits.Caused by Component Failure.Pump Bearings Found Failing.Bearing to Shell Clearance Increased & Pump Bearing Replaced

ML19326A113
Person / Time
Site:	Davis Besse
Issue date:	08/04/1978
From:	Hartigan J TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19326A105	List: ML19326A104 ML19326A113
References
LER-78-077-03L, LER-78-77-3L, NUDOCS 8001310673
Download: ML19326A113 (2)

Text

U.E. NUCLEAR REGULATORY COMt.itS5tv.d MRC FUM 366 ,

' LICENSEE EVENT REPORT (PLEASE PRINT OR TYPE ALL REQUIRED INF ORMATIONI NTROL BLOCK: l i

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.1 mil. j I o 121 1 (CCW) Pump 1-1 vibration readings exceeded the allowable 1.5 mils. max by The l ro g l l There was no danger to the health and safety of the public or unit personnel.

The standby CCW Pump was placed in l

o;3) j unit was in Mode 5 at the ti=e of the occurrence.

l (NP-33-78-92)

UTs-] I service prior to the failure of CCW Pu=p 1-1.

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JJ l@LI_J@ 34 3I 40 42 43 A4 CAUSE DESCRIPTION AND CCRRECTIVE ACTIONS I

l ;oj] The caus,e of this occurrence is component failure. The oumo bearines were examined I

,jij l and the thrust bearing was found to be failine. Further investization revealed tha

,,,,,I liearing to shell clearance was not adequate and the bearing ioint was not s=co th. _

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,,,j,l Maintenance personnel increased the bearing to shell clearance, smooched the bearine I

, , , ,, i l joints, and replaced the pu=p bearing. so 7 a s

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OTHER STATUS

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(v TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLDfENTAL INFORMATION FOR LER NP-33-78-92 DATE OF EVENT: July 10, 1978

' FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Component Cooling Water Pump 1-1 high vibration Conditions Prior to Occurrence: On July 10, 1978, at 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br /> during the con-duct of ST 5074.01, " Component Cooling Water (CCW) Monthly Surveillance Test",

CCW Pump 1-1 vibration readings exceeded the allowable 1.5 mils max by .1 mil.

CCW Pump 1-1 was shutdown and standby CCW Pump 1-3 was placed in operation. CCW Pump 1-2 was also in operation at the time of the occurrence. Since the unit was in Mode 5 at the time of the occurrence, the unit was not placed into an action statement. This incident is being reported as documentation of a compon-eut failure.

Designation of Aeoarent Cause of Occurrence: The cause of this occurrence is component failure. Under Maintenance Wo-k order 78-1839, the pump bearings w were examined and the thrust bearing was found to be failing. A thorough inspec-

) tion of the pumn was performed and it was discovered the bearing to shell clear-d ance was not adequate and the bearing joint was not smooth. This may have re-stricted oil flow and caused the bearing failure.

Analysis of Occurrence: There was no danger to the health and safety of the public or to unit personnel. The unit was in Mode 5 at the time of the occurrence. The standby CCW Pump was placed in service prior to the failure of CCW Pump 1-1.

Corrective Action: Under Work Order 78-1839, maintenance personnel increased the bearing to shell clearance, smoothed the bearing joint, and replaced the thrust bearing on CCW Pump 1-1. The other two CCW Pumps will be inspected when removed from service for normal preventative maintenance.

Failure Data: There have been no previous reported occurrences of CCW Pump bearing failures.

LER J78-077 J .

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