05000260/LER-1979-018-03, /03L-0 on 790727:indicating Lights Failed for Reactor Bldg to Torus Vacuum Breaker,Fcv 2-64-21.Valve Inoperative Contrary to Tech Specs.Caused by Control Circuit Fuse Blowing Due to Failure of Coil for Relay 16A-K40

/03L-0 on 790727:indicating Lights Failed for Reactor Bldg to Torus Vacuum Breaker,Fcv 2-64-21.Valve Inoperative Contrary to Tech Specs.Caused by Control Circuit Fuse Blowing Due to Failure of Coil for Relay 16A-K40

ML18024A982
Person / Time
Site:	Browns Ferry
Issue date:	08/24/1979
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18024A983	List: 05000260/LER-1979-018, Forwards LER 79-018/03L-0 05000260/LER-1979-018-03, /03L-0 on 790727:indicating Lights Failed for Reactor Bldg to Torus Vacuum Breaker,Fcv 2-64-21.Valve Inoperative Contrary to Tech Specs.Caused by Control Circuit Fuse Blowing Due to Failure of Coil for Relay 16A-K40
References
LER-79-018-03L, LER-79-18-3L, NUDOCS 7908280742
Download: ML18024A982 (8)

LER-1979-018, /03L-0 on 790727:indicating Lights Failed for Reactor Bldg to Torus Vacuum Breaker,Fcv 2-64-21.Valve Inoperative Contrary to Tech Specs.Caused by Control Circuit Fuse Blowing Due to Failure of Coil for Relay 16A-K40

Event date:
Report date:
2601979018R03 - NRC Website

text

'l REGULATORY INFORMATION DISTRIB TION SYSTEM (RIDS)

AC(.OSSIAN NBR:7908280742 C,DATE; 79/08/24 NOTARIZE,:

NO DOCKET FACIL:50-260 Browns Ferry.Nuclear Power Station~

Unit 2~

Tennessee 05000260 AUTH'AME AUTHOR AFFILIATION Tennessee Valley Authority RECIP ~ NAME RECIPIENT AFFILIATION Region 2i Atlanta'ffice of the Director

SUBJECT:

LER 79-018/03L 0

on 790727lindicating lights failed for FCV 2 64"21ireactor bldg to torus vacuum breaker, Valve inoperative contrary to Tech/Specs'aused by control circuit fuse blowing due to failure of coil for relay 16A K40, DISTRIBUTION CODE:

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A RECIPIENT ID CODE/NAME" ACTION:

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August 24, 1979

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TENNESSEE VALLEYAUTMORITY cHATTANQQGA. TENNEssEE 37401 716 Edney,Building Mr. James P.

O'Re y, Director U.S. Nuclear Re latory Commission Office of Ins ction and Enforcement Region II 101 Mari a Street, Suite 3100 Atlant, Georgia 30303

Dear Mr. O'Reialy:

F TENNESSEE VALLEY AUTHORITY BROWNS FERRY NUCLEAR PLANT UNIT 2 - DOCKET NO. 50-260 - FACILITY OPERATING LICENSE DPR REPORTABLE OCCURRENCE REPORT BFRO-50-260/7918 The enclosed report provides details concerning a loss of indicating lights for FCV 2-64>>21, reactor building to torus vacuum breaker, during normal operation.

This report is submitted in accordance with Browne Ferry unit 2 Technical Specification 6.7.2.b.2.

Very truly yours, TENNESSEE VALLEY MTHORITY.

J, R. Calhoun Director of Nuclear Power Enclosure (3) cc (Enclosure)!

Director (3)

Office of Management Information and rogram Control U.S. Nuclear Regulatory Commission washington,'DiC.

20555 Director (40)

Office of Inspection and Enforcement.

U.S. Nuclear Regulatory Commission

$1ashington, D.C, 20555 R. P. SuUivan, NRC Inspector, Browne Perry N

'7 908 8 807'3~1 An Equal Opportunity Employer

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9 QD GO G I DOCKET NUMBER GB 639 EVENT DATE 74 75 REPORT DATE

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80 EVEN'I'ESCRIPTION AND PROBABLE CONSEQUENCES Q10 During normal operation, the control room operator observed a loss of indicating lights for FCV 2-64-21, reactor building to torus vacuum breaker.

Further investigation re-4 l ~os vealed the valve inoperative, contrary to Tech.

Spec 3.7.A.3.a.

There were no sig-nificant resulting occurrences.

There were no previous similar occurrences.

There was no effect on the public health or safety.

Redundant valve FCV-2-64-20 was oper-(pe~]

able.

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CAUSE

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,CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Q27 o

The coil for relay 16A-K40, GE 115V 60 c Model 55-1G failed causing the control cir-cuit fuse for FCV-2-64-21 to blow.

The rela coil was re laced and a new fuse in-

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FACILITY STATUS

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"1'ennessee Valley Authority Drowns Ferry Nuclear Plant e

LER SUPPLEMENTAL INFORMATION Form BF-17 BF 15. 2 1/10/79 BFRO 260 /

7918 Technical Specification Involved

3. 7.A. 3.a and b

Reported Under Technical Specification 6.7.2.b.2 Date of Occurrence 7/27/79 Time of Occurrence 1800 Unit 2

Identification and Descri tion'of Occurrence:

Operator observed that there was a loss of indicator lights for FCV 2-64-21.

Conditions Prior to Occurrence:

Unit at full load and normal operation.

Action specified in the Technical Specification Surveillance Requirements met due to ino erable e ui ment.

Describe.

Tech.

Spec.

3.7.A.3.b allowed seven-day continued operation.

Valve repaired in less than three hours.

~A ~arear Cause of Occurrence:

Coil for relay 16A-K40 failed resulting in the control fuse for FCV 2-64 blowing.

N/A Corr ective Action:

Relay coil and fuse replaced.

Failure Data:

N/A

~Retention:

~Revision:

eriod - Lifetime; Responsibility

- Administrative Supervisor

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