05000296/LER-1980-021-03, /03L-0:on 800609,during Normal Operation,Reactor Core Isolation Cooling Turbine Tripped on Overspeed Due to Loss of Speed Control.Caused by Failure of Voltage Suppressor CR-1,type S-240,in Egm Box

/03L-0:on 800609,during Normal Operation,Reactor Core Isolation Cooling Turbine Tripped on Overspeed Due to Loss of Speed Control.Caused by Failure of Voltage Suppressor CR-1,type S-240,in Egm Box

ML18025A958
Person / Time
Site:	Browns Ferry
Issue date:	07/03/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18025A957	List: 05000296/LER-1980-021, Forwards LER 80-021/03L-0 05000296/LER-1980-021-03, /03L-0:on 800609,during Normal Operation,Reactor Core Isolation Cooling Turbine Tripped on Overspeed Due to Loss of Speed Control.Caused by Failure of Voltage Suppressor CR-1,type S-240,in Egm Box
References
LER-80-021-03L-03, LER-80-21-3L-3, NUDOCS 8007110394
Download: ML18025A958 (2)

LER-1980-021, /03L-0:on 800609,during Normal Operation,Reactor Core Isolation Cooling Turbine Tripped on Overspeed Due to Loss of Speed Control.Caused by Failure of Voltage Suppressor CR-1,type S-240,in Egm Box

Event date:
Report date:
2961980021R03 - NRC Website

text

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~During normal operation while performing S.I. 4.5.p.l.d&s RCIC turbine tripped on overspeed due to loss of speed control.

Reference T.S. 3.5.F.2.

HPCI was proven

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A voltage suppressor, CR-1, type S-240, in the EGH box failed.

The CR-1 voltage suppressor was replaced.

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Form BF-17 BF 15. 2 1/10/79 LER SUPPLEMENTAI., INFORMATION BFHO 296 / 8021

. Technical Specification Involved Reported Under Technical Specification

6. 7. 2. b (2)

Date of Occurrence 6/9/80 Time of Occurrence r 1250 Unit Identificition and Description'of Occurrence:

RCIC turbine tripped on overspeed due to loss of speed control.

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Conditions Prior to Occurrence:

Unit l 8 100%

Unit 2 8 96%

Unit 3 8 93%

I Action specified in the Technical Specification Surveillance Requiren>ents met duc to i~no arabia cg~ui ment..

Describe.

HPCI verified operable.

A~parent Cause oi'ccurrence:

Speed control lost du'e to the failure of a voltage suppressor, CR-l, in the-RCIC EGM box.

A~nal sis of Occurrence:

There was no damage to plant equipment.

There was no activity release, no personnel exposure or injury> and no danger to the health or safety of the public.

Coi rective Action:

The voltage suppressor was replac'ed.

Failure Data:

BFRO'-50-259/74007.

~Retention:

'eriod - Lifetime; Responsibility - Administrative Supe~visor

~Revision: