05000260/LER-1979-015-03, /03X-0:on 790607,during Normal Operation,Hpci Tripped Several Times on Mechanical Overspeed.Caused by Damage to Ball & Tappett Assembly Due to Improperly Set Trip Weight.Ball & Tappett Assembly Replaced & Trip Weight Reset

/03X-0:on 790607,during Normal Operation,Hpci Tripped Several Times on Mechanical Overspeed.Caused by Damage to Ball & Tappett Assembly Due to Improperly Set Trip Weight.Ball & Tappett Assembly Replaced & Trip Weight Reset

ML18024B158
Person / Time
Site:	Browns Ferry
Issue date:	11/27/1979
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18024B157	List: 05000260/LER-1979-015, Forwards LER 79-015/03X-1 05000260/LER-1979-015-03, /03X-0:on 790607,during Normal Operation,Hpci Tripped Several Times on Mechanical Overspeed.Caused by Damage to Ball & Tappett Assembly Due to Improperly Set Trip Weight.Ball & Tappett Assembly Replaced & Trip Weight Reset
References
LER-79-015-03X, LER-79-15-3X, NUDOCS 7911300448
Download: ML18024B158 (4)

LER-1979-015, /03X-0:on 790607,during Normal Operation,Hpci Tripped Several Times on Mechanical Overspeed.Caused by Damage to Ball & Tappett Assembly Due to Improperly Set Trip Weight.Ball & Tappett Assembly Replaced & Trip Weight Reset

Event date:
Report date:
2601979015R03 - NRC Website

text

r PDATE REPORT P IOUS REPORT DATE 7//5//79 L(CENSEE EVENT REPORT

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LICENSEE CODE 14 15 LICENSE NUMBLA 25 26 I.ICENSE TYPE 30 57 CAT 58 soUAGE MQ<< 'O Z <<07 <<O 7

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OB 60 GI DOCKET NUMBER 68 69 EVENT DATE 74 7S REPORT DATE 80 EVENT DESCRIPTION ANO PROBABLE CONSEQUENCES QIO While erformin SI 4.5.E durin normal o eratio p

~03 mechanical overspeed.

The mechanical overs eed mechanism was removed and ins ected. The ball and ta et assembl was found to have been dama ed. This was not in a co with Technical Specification 3.5.E.

There were no si nificant resultin occurrences.

3 There were no revious events of this nature.

There was no azard to the health or

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safet of the ublic.

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~00 set causing damage to the ball and tappet assembl Ball and tappet assembly was re-SYSTEM

CAUSE

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10 NAME OF PREPARER 80 80 45 80 80 80 68 69 PHONE

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'I'ime of Occuvvence OS00 "r.'t; 2

Iden'ifica tion 'rrrd Description 'of Occur'vence:

During unstable operation of HPCI the HPCI turbine tripped on mechanical overspqed several times.

As a precautionary

measure, the overspeed mechanism was removed and inspected.

Ball and tappet"assembly was found to have been damaged.

Condi'.iona Prior to Occur rance:

Unit was in normal operation at 74 percent power.

Actiorr specified in tire Technical Specificnt,'o>> SurveiII:me" hecluirernerrt.s

.rr"t.

due..c inoperable equipment..

De. cribe.

A HPCZ was tagged out for service;

RCIC, ADS,

CSS, and RHR were available.

,tr..l~,rr'.:r.. C.'art~<. ct'ccr.rye(nce:

Mechanical overspeed trip weight was improperly set.

Antrlvsis of Occurrence:

There was no damage to plant equipment, no injury to personnel, no danger to health or safety of the public, no reduction in power generation.

Cot vec t,i ye Act.ion:

Ball and tappet assembly was replaced, trip weight properly set, and overspeed tests run to ensure proper'peration.-

Unit 1 overspeed trip mechanism was inspected to ensure proper setting on 7/16/79.

Unit 3 will be inspected prior to startup from refueling outage.

Fuilur e D,rta:

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