05000296/LER-1979-002-03, /03L-0 on 790117:during Maintenance of Reset Switch,Short Circuit Damaged Power Supply & Sensor Circuit Board,Rendering Fixed Spray Automatic Initiation Circuit for Fire Protection Inoperable

/03L-0 on 790117:during Maintenance of Reset Switch,Short Circuit Damaged Power Supply & Sensor Circuit Board,Rendering Fixed Spray Automatic Initiation Circuit for Fire Protection Inoperable

ML18024A683
Person / Time
Site:	Browns Ferry
Issue date:	02/06/1979
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18024A682	List: 05000296/LER-1979-002, Forwards LER 79-002/03L-0 05000296/LER-1979-002-03, /03L-0 on 790117:during Maintenance of Reset Switch,Short Circuit Damaged Power Supply & Sensor Circuit Board,Rendering Fixed Spray Automatic Initiation Circuit for Fire Protection Inoperable
References
LER-79-002-03L, LER-79-2-3L, NUDOCS 7902140117
Download: ML18024A683 (4)

LER-1979-002, /03L-0 on 790117:during Maintenance of Reset Switch,Short Circuit Damaged Power Supply & Sensor Circuit Board,Rendering Fixed Spray Automatic Initiation Circuit for Fire Protection Inoperable

Event date:
Report date:
2961979002R03 - NRC Website

text

(7:77)

L[CENSEE EVENT REPORT EHI 7

8 CON'T

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8 CONTROL BLOCK:

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9 LICENSEE CODE

,Q (PLEASE PRINT OR TYPE ALLREQUIRED INFORMATION) 3Q2 0

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14 15 LICENSE NUMBER 0'>>0~0 25 26 LICENSE TYPE 30 57 CAT 58

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O 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION ANO PROBABLE CONSEQUENCES QIO Durin normal ower o eration while re lacin a broken reset switch on fire r ~~

tion panel 3-25-291, a short circuit dama ed the ower su 1

and sensor circuit board rendering the fixed spray automatic initiation circuit for fire rot ct'on po e

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inoperable in violation of T.S. 4.11.A.l.b.

There is no redundant s stem.

There was no hazard to the ublic health or safet Previous occurrences:

None 0

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8 9

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8 SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE 0"

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10 11, 12 13 18 19 20 SEOUENTIAI OCCURRENCE REPORT AEVI5 I OPN LERIAO EVENT YEAR REPORT NO.

CODE TYPE NO..

Qll AEPAAT ~79

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~03

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~0 21 22 23 24 26 27 28 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPA~

PRIME COMP.

COMPONENT TAKEN ACTION ON PLANT METHOD HOUAS +22 SUBMITTED FOAh'I SUB.

SUPPLIER MANUFACTURER LUSL'JS LJS uS ~

LJS LJS LuS 33 34 35 36 37 40 41 42 43 44 47 CAUSE OESCRIPTION ANO CORRECTIVE ACTIONS Q27 o

The short circuit occurred durin maintenance activities.

The dame ed circuit board was replaced and the system was returned to normal o eration.

No recurrence control action is appropriate.

3 7

8 9

FACILITY STATUS '

POWER OTHE A STATUS Q E

0 9

9 NA 9

'I I 12 LOSS OF OR DAMAGETO FACILITYQ43 TYPE

DESCRIPTION

~ZQ42 NA 9

10 P U8 L IC ITY ISSUED DESCRIPTION~

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10

~75 028~ 028 7

8 9

10 12 13 44 ACTIVITY CONTENT RELEASED OF RELEASE Ah'IOUNT OF ACTIVITYQ

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Q33

~ZQ34 NA 7

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10 44 PERSONNFL EXPOSURES NUMBER TYPE DESCRIPTION Q39

~77 ~00 0

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NA 7

8 9

11 12 13 PERSONNEL INJURIES NUMBER DESCRIPTIONQ [118j ~00 0

Q48 NA METHOD OF DISCOVERY OISCOVEAY DESCRIPTION Q32

~Z Q31 Performing corrective maintenance 45 LOCATION OF AELEASEQ 45 80 80 80 7

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NAME OF PREPARER 790Z14ol) /

PHONE:

68 89 80 NRC USE ONLY 80

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LER SUPPLEiMNTAL INFORNATION rory or "x (

BF 15.2 6/09/78 BFRO 296 /

792 Technical Specification Involved 4.11.A. l.b Reported Under Technical Specification 6.7.2.b(2)

Date of Occurrence 1/17/79 Time of Occurrence 13oo Unit Identification and Descri tion of Occurrence:

During normal power operation, while replacing a broken reset switch on fire protection panel 3-25-291, a short circuit damaged the power supply and sensor circuit board; rendering the fMed spray automatic initiation circuit for fire protection zone 3J inoperable in violation of T.S. 4.11.A.l.b.

Conditions Prior to Occurrence:

Unit operating at 99%%u'ower.

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

Describe.

A roving fire watch was posted as required.

A arent Cause of Occurrence:

Naineenance personnel error.

Anal sis of Occurrence:

The short circuit was caused by, maintenance personnel replacing a broken reset.

switch.

r

Corrective Action

The damaged circuit board 4ras replaced'nd the system returned to normal operations after satisfactorily being testing in accordance with SI 4.11.C.3 and 4.

Failure Data:

None previous.

Tennessee Valley Authority - Browns Ferry Nuclear Plant