05000296/LER-1979-026-03, /03L-0:on 791207,during Refueling Outage,Reactor Core Isolation Cooling Failed to Reach Rated Flow Per Tech Specs.Caused by Defective High Trim Potentiometer in Reactor Core Isolation Cooling Sys.Egm Box Replaced

/03L-0:on 791207,during Refueling Outage,Reactor Core Isolation Cooling Failed to Reach Rated Flow Per Tech Specs.Caused by Defective High Trim Potentiometer in Reactor Core Isolation Cooling Sys.Egm Box Replaced

ML18024B221
Person / Time
Site:	Browns Ferry
Issue date:	01/04/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18024B220	List: 05000296/LER-1979-026, Forwards LER 79-026/03L-0 05000296/LER-1979-026-03, /03L-0:on 791207,during Refueling Outage,Reactor Core Isolation Cooling Failed to Reach Rated Flow Per Tech Specs.Caused by Defective High Trim Potentiometer in Reactor Core Isolation Cooling Sys.Egm Box Replaced
References
LER-79-026-03L-01, LER-79-26-3L-1, NUDOCS 8001090407
Download: ML18024B221 (4)

LER-1979-026, /03L-0:on 791207,during Refueling Outage,Reactor Core Isolation Cooling Failed to Reach Rated Flow Per Tech Specs.Caused by Defective High Trim Potentiometer in Reactor Core Isolation Cooling Sys.Egm Box Replaced

Event date:
Report date:
2961979026R03 - NRC Website

text

NRC FPI(h( 3(l(i (2 '/7I t

NUCLEAR REGULATORY Coh'IMISSION LICENSEE EVENT REPORT O

I 78 8

CONTROL IILO(:K:

Qi (PLEASE PRINT OR TYPE ALLREQUIRED INFORMATIONI I

8 A

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60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 FVENT DESCRIPTION AND PROBABLE CONSEQUENCES QIO aLaMO>

REPORT DATE 80 T 4

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CZ3, There was no dan er to health or safet of ublic and no si nificant resultin events.

No previous occurrences.

HPCI was verified o erable.

~OS SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE Coh'IPONENT'UBCOQE SUBCODE ICJ E}QI LE}(ih>

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9 F AGILITY STATUS 96 POWER OTHER STATUS Q 5

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9 10 12 13 44 ACTIVITY CONTENT RELEASED QF IIELEASE AMOUNror AC(IVI;Y QIB

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10 NAME OF PREPARER

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, B erator observed LOCA(IOVOF R(,LEASE Q3B NA NRC Uoir (2',(

68 69 8001090

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Tennessee Valley Authority Browns Ferry Nuclear Plant r

Form BF-17 BF 15s2 1/10/V9 LER SUPPLEMENTAL INFORMATION BFRO 296 /

7926 Technical RI ""if":,ation Involved Reported Under Technical Specificatis>>

6 7

2 b 2

Date of Occurrence 12/7/79 Timf.

~: t <<nce 1140 Vnit Identification and Descr~ition'of Occurrence:

RCIC failed to reach rated flow.

r

(;i)ndition't i<>>

to l,'>ccurrl'ncc:

Unit 1 8 83%.

Unit 2 8 80%.

Unit 3 8 0% refueling outage.

Action pecified in the Technical Specification Surveillance Requirements met r

HpCT proved operable.

~Anarent Cause of Occurrence:

EGM box failed due to a defective high trim potentiometer.

Analysis of Occurrence:

There was nd danger to health or safety of the pcblfc, no activity release, no damage to plant equipment.

Corrective Action

The EGM box was replaced.

Failure Data:

NA

~Re ten tion:

~Revision:

s eriod - Lifetime; Responsibility - Administrative Supervisor

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