05000259/LER-1980-001, Supplemental LER 80-001/01T-1:on 800107,during Performance of Ster 7902 Per IE Bulletin 79-23,diesel Generator 3A Lost Speed Control.Caused by Deteriorated Elastomer Spider Coupling.Spider Coupling Replaced

Supplemental LER 80-001/01T-1:on 800107,during Performance of Ster 7902 Per IE Bulletin 79-23,diesel Generator 3A Lost Speed Control.Caused by Deteriorated Elastomer Spider Coupling.Spider Coupling Replaced

ML19309E607
Person / Time
Site:	Browns Ferry
Issue date:	04/18/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19309E594	List: 05000259/LER-1980-001, Supplemental LER 80-001/01T-1:on 800107,during Performance of Ster 7902 Per IE Bulletin 79-23,diesel Generator 3A Lost Speed Control.Caused by Deteriorated Elastomer Spider Coupling.Spider Coupling Replaced
References
IEB-79-23, LER-80-001-01T, LER-80-1-1T, NUDOCS 8004220699
Download: ML19309E607 (2)

LER-1980-001, Supplemental LER 80-001/01T-1:on 800107,during Performance of Ster 7902 Per IE Bulletin 79-23,diesel Generator 3A Lost Speed Control.Caused by Deteriorated Elastomer Spider Coupling.Spider Coupling Replaced

Event date:
Report date:
2591980001R00 - NRC Website

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UPDATE REPORT - PREVIOUS REPORT DATE.. I/18/80 RECUT.AvuHY COMMISSION LICE;NME EVENT nt:Pt)RT CdNTROL BLOCK: l l

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8 60 G1 DOC K E T NI.,Mb E R 6,5 0:7 EV ENT D ATE 74 7h REPORT O ATE 80 EVENT DESCniPTION AND PROBABLE CONSEQUENCES h o :. l With unit 3 in cold shutdown while performing tests in accordance with IE 79-23 l

l speed control on the 3A diesel generator was lost. There was no danger to the o 3 I o I.:1 l health and safety of the public. Unit 3B, C, and D diesel generators were operable.

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CAUSE CESCRIPTION AND CORRECTIVE ACTIONS h Mechanical j i i o ; l Coupling which connects speed pick-up to generator shaf t had broken.

,3,j l Maintenance Instruction 19.1-D was written to inspect all diesels.

Couplings were

,,,,,,l inspected and all rubber spiders were replaced. Couplings on 3A and 3C were also

,,33, l replaced. Lovejoy, 1/2 inch flex. Model LO90/95. Couplings have been placed on l

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Tennessee Valley Authority Fcrm BF-17 Browns Ferry Nuclear Plant BF 15.2 UPDATED REPORT - PREVIOUS REPORT DATED 1/18/80 1/10/79

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LER SUPPLEMENTAL INFORMATION BFRO 259 / 801 Technical Specification Involved NA Reported Under Technical Specification 6.7.2.A.9 Date of Occurrence 1/7/80 Time of Occurrence 1100 Unit 1

Identification and Descriotion of Occurrence:

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Speed control on the 3A diesel generator was lost during the performance of STER 7902 per IE bulletin 79-23.

Conditions' Prior to Occurrence:

Unit 1 in scheduled refueling outage.

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Unit 2 at reduced power at 840 We.

Unft 3 was in cold shutdown.

Action specified in the Technical Specification Surveillance Requirements met due to inoperable equipment.

Describe.

NA

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Apparent Cause of Occurrence: The elastomer spider coupling had deteriorated and failed causing meta 1 to metal iiontact of the ' coupling halves.

This caused the speed pick-up coupling half to fail. 'Apparently the material used in the spider is vulnerable,

to attack by the heat and oil present in the environment.

The deterioration eventually caused the spider to fracture when subjected to the loading of the coupling half.

Analysis of Occ irrence:

There was no danger to health or safety of the public.

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Corrective Action

Tlie spider coupling was replaced on units 1, 2, and unit 3 diesel generators.

The coupling on.3C diesel generator was also-found to be defective-No significant deterioration was obs,erved on other units.

To preclade recurrence, the 5

couplings have been placed on a program for periodic inspection.

Failure Data:

NA

• Reten tien :

Period - Lifetime; Responsibility - Administrative Supervisor

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• Revisien:

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