05000285/LER-1980-029-03, /03L-0:on 801106,outboard Motor Bearing on Containment Spray Pump SI-3C Motor Found Severely Degraded & Motor Shaft Scored.Probably Caused by Lack of Oil to Bearing.Bearing Replaced & Rotor Shaft Repaired

/03L-0:on 801106,outboard Motor Bearing on Containment Spray Pump SI-3C Motor Found Severely Degraded & Motor Shaft Scored.Probably Caused by Lack of Oil to Bearing.Bearing Replaced & Rotor Shaft Repaired

ML19351E585
Person / Time
Site:	Fort Calhoun
Issue date:	11/07/1980
From:	Mueller R OMAHA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19351E583	List: 05000285/LER-1980-029, Forwards LER 80-029/03L-0 05000285/LER-1980-029-03, /03L-0:on 801106,outboard Motor Bearing on Containment Spray Pump SI-3C Motor Found Severely Degraded & Motor Shaft Scored.Probably Caused by Lack of Oil to Bearing.Bearing Replaced & Rotor Shaft Repaired
References
LER-80-029-03L, LER-80-29-3L, NUDOCS 8012100484
Download: ML19351E585 (4)

LER-1980-029, /03L-0:on 801106,outboard Motor Bearing on Containment Spray Pump SI-3C Motor Found Severely Degraded & Motor Shaft Scored.Probably Caused by Lack of Oil to Bearing.Bearing Replaced & Rotor Shaft Repaired

Event date:
Report date:
2851980029R03 - NRC Website

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60 61 OOcKET NUMBER the 69 EVENT CATE 74 75 REeORT QATE 80 EVENT oESCRIPTioN AND P loBABLE CONSEQUENCES h io i2i I While at approx:mately 80% power,.andwhile performing routine oreventive maintenance r5T31 ;

tasks on the SI-3C (containment spray pump) motor, it was discwiered that the out-l io yi l board motor bearing was severely degraded and the rotor shaft, at the outboard end I 3

iots,i of the motor, somewhat scored. At the time of the incident, the remaining two l

io is i l containment spraypumps, SI-3A and SI-36, were operable and available as was the l

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mi caused by lack of oil to the bearino. The failed motor bearino was reolaced. the I

i,,2i i rotor shaft repaired accordingly, and the motor / pump was returned to satisfactory I

operation. To prevent future similar events, all HPSI, LPSI, and Containment Spray mI motor bearina oil levels will continue to be monitored on a monthlv huie nor ette_

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LER No.80-029 0maha Public Power District Fort Calhoun Station Unit No. 1 Docket No. 05000285 1

I Attachment No. 1

Safety Analysis

j The Fort Calhoun Station Unit No.1 is so designed that no single failure, by itself, can adversely affect the ability of the plant to safely shutdown in case of an accident.

During the time SI-3C, the containment spray pump, was out due to motor bearing failure, the remaining two containment spray pumps SI-3A and SI-3B were operable and available. The Fort Calhoun Station's con-tainment spray system is sized such than any two of the three containment spray pumps would limit the containment pressure to below the design value following a Design Basis Accident without taking credit for the air coolers or the cooling capacity of the safety injection system.

In ad-dition, and as stated in the Technical Specifications (2.4), the contain-ment air recirculation, cooling and iodine removal system is completely redundant to the containment spray system.

During the time SI-3C was inoperable, the entire containment air recirculation, cooling and iodine removal system was operable and available should the need arise to mitigate the consequences of an accident.

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p LER No.80-029 Omaha Public Power District Fort Calhoun Station Unit flo.1 Docket No. 05000285 Attachment flo. 2

Corrective Action

Maintenance Order No. 7768 was wr1tten to correct the problem of a damaged outboard motor bearing and & c ored rotor shaft (at the outboard end). The motor bearing was replaced with a spare as was the bearing seal. The scored shaft was repaired and the motor was then re-assembled and tested for proper operation per applicable sections of ST-SI/CS-1.

The test was completed satisfactorily. As a result of this failure, the operators have been cautioned to "'eck oil levels for Safety Injection and Containment Spray Pump bearings on a routine basis and prior to running any of the pumps.

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LER No.80-029 Omaha Public Power District Fort Calhoun Station Unit No.1 Docket No. 05000285 Attachment No. 3

' Failure Data This is the first failure of this type at the Fort Calhoun Station Unit No. 1 i

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