05000259/LER-1980-012-03, /03L-0:on 800201,during Refueling Outage,Damaged Electrical & Mechanical Overspeed Protection Assemblies Found on Reactor Core Isolation Cooling Turbine.Caused by Unclear Installation Instructions.Assemblies Repaired

/03L-0:on 800201,during Refueling Outage,Damaged Electrical & Mechanical Overspeed Protection Assemblies Found on Reactor Core Isolation Cooling Turbine.Caused by Unclear Installation Instructions.Assemblies Repaired

ML19294B744
Person / Time
Site:	Browns Ferry
Issue date:	02/29/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19294B741	List: 05000259/LER-1980-012, Forwards LER 80-012/03L-0 05000259/LER-1980-012-03, /03L-0:on 800201,during Refueling Outage,Damaged Electrical & Mechanical Overspeed Protection Assemblies Found on Reactor Core Isolation Cooling Turbine.Caused by Unclear Installation Instructions.Assemblies Repaired
References
LER-80-012-03L, LER-80-12-3L, NUDOCS 8003050453
Download: ML19294B744 (2)

LER-1980-012, /03L-0:on 800201,during Refueling Outage,Damaged Electrical & Mechanical Overspeed Protection Assemblies Found on Reactor Core Isolation Cooling Turbine.Caused by Unclear Installation Instructions.Assemblies Repaired

Event date:
Report date:
2591980012R03 - NRC Website

text

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EVENT 04TE 74 IS PEPORT D ATE SJ EVENT Cf SCRIPTION AND PROS A8LE CONSEcuENCES h l

o 2 l With Unit 1 in a scheduled refueling outage, preventative raintemnce _ _ _ _

revealed damaged electrical and mechanical overspeed protection assemblies o

a on the reactor core isolation cooling turbine. There was no danger to the I

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o,, g health or safety of the public, no release of activity, and no sinnificant resulting occurrences. See Technical Specifications 3.5.F.1.

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[ Unclear installation instructions in the terry turbine manual resulted in i

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,,;,,l damaging the electronic overspeed, which in turn may have allowed damace to the J

mechanical overspeed. Both oversp2ed assemblies were repaired and the manual I

y clarified. Overspeed trip tests will be run when unit is returned to operational I

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Tennessee Valley Authority Form BF-17 Browns Ferry Nuclear Plant BF 15.2

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1/10/79 LER SUPPLEhENTAL INFORMATION 259 8012 3.5.F.1 BFRO j Technical Specification Involved 6.7.2.b.2 Reported Under Technical Specification 2-1-80 2.00 pm 1

Date of Occurrence Time of Occurrence Unit Identification and Description of Occurren e:

While disassembling the RCIC Terry Turbine during preventative maintenance it was discovered that the electrical and mechanical overspeed trip mechanisms were damaged.

Conditions ~ Prior to Occurrence:

Unit 1 - scheduled refueling outage Unit 2 - 76% steady state power Unit 3 - 94% steady state power Action specified in the Technical Specification Surveillance Requirements met due to inoperable equipment. Describe.

NA - Unit in refueling outage Apparent Cause of Occurrence:

Unclear installation instructions in the Terry Turbine manual resulted in damage to the electrical overspeed which may have damaged tne mechanical overspeed.

Analysis of Occ'urrence:

No danger to health or safety of the public, no release of activity, no damage to plant or equipment, no significant resulting occurrences.

Corrective Action

' Mechanical and electrical overspeed mechanisms repaired and manual clarified. Overspeed tests to be run when unit is returned to o erational e

readiness.

Failure Data:

NA

• Retention :

Period - Lifetime; Responsibility - Administrative Supervisor

• Revision:

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