05000260/LER-1979-005-03, /03L-0 on 790419:broken Terminal Discovered on Shutdown Board D Battery.Cause Unknown.Affected Cells Replaced & Personnel Instructed in Proper Tightening Methods

/03L-0 on 790419:broken Terminal Discovered on Shutdown Board D Battery.Cause Unknown.Affected Cells Replaced & Personnel Instructed in Proper Tightening Methods

ML18024A803
Person / Time
Site:	Browns Ferry
Issue date:	05/17/1979
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18024A802	List: 05000260/LER-1979-005, Forwards LER 79-005/03L-0 05000260/LER-1979-005-03, /03L-0 on 790419:broken Terminal Discovered on Shutdown Board D Battery.Cause Unknown.Affected Cells Replaced & Personnel Instructed in Proper Tightening Methods
References
LER-79-005-03L-01, LER-79-5-3L-1, NUDOCS 7905230336
Download: ML18024A803 (3)

LER-1979-005, /03L-0 on 790419:broken Terminal Discovered on Shutdown Board D Battery.Cause Unknown.Affected Cells Replaced & Personnel Instructed in Proper Tightening Methods

Event date:
Report date:
2601979005R03 - NRC Website

text

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43 I UHIYI36lf (7-77) t NUCLEAR REGULATORY COMMISSION LICENSE E EV EN T R EPORT (PLEASE PRINT OR TYPE ALLREQUIRED INFORMATIONI QA>>

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25 26 LICENSE TYPE JO 57 CAT 58 9

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7 7~9 0'4 75 REPORT DATE 80 CONTROL BLOCK:

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LICENSEE CODE 14 15

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LICENSE NUMBER CON'T soURcE LLANO 5

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6 0

7 0

4 1

9 7

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60 61 DOCKET NUMBER 68 69 EVENT DATE EVENT OESCRIPTION AND PROSASLE CONSEQUENCES QIO

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Durin normal o eration a broken terminal was di ve d

The battery is required to be o erable b

T. S.

3 ~ 9 ~ B ~ 5 ~

Unit 3 main batter was available for transfer.

Unit 1 was also affected.

There were no effects o

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health or safety.

No previous occurrences of this t e.

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8 SYSTEM

CAUSE

CAUSE

COMP, VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

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'2 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION LEBJBO REPORT NO.

CODE TYPE NO.

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L~J LJ L~J 21 22 23 24 26 27 28 29 30 31 32 AC1'ION FUTURE EFFECT SHUTDOWN ATTACHMENT NPBD.4 PRIME COIJP.

COMPONENT TAKEN ACTION ON PLANT METHOD HOURS Q22 SUBMITTED FORM SUB.

SUPPLIER MANUFACTUBEff

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3 Q28 33 34 35 36 37 40 41 42 43 44 47 CAUSE OESCRIPTION ANO CORRECTIVE ACTIONS Q27 o

Cause

unknown but ma have been due to im r b

the terminal were re laced and all other bat e

and found satisfactory.

Personnel have been instructed as to proper tightening methods OOC type 3DCU-a.

Manufactured by C&D.

7 8

9 FACILITY STATUS 9IPOWER OTHER STATUS Q

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Q28 ~09 6

Q28 NA 7

8 9

10 12 13 44 ACTIVITY CONTENT RELEASED OF RELEASE AMOUNTOF ACTIVITYQ

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Q33 Z Q34 NA 7

8 9

10 11 44 PERSONNEL EXPOSURES NULIBER TYPE DESCRIPTION Q3

~Et ~00 0JQ32 Z

Q38 NEI 7

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11 12 13 PERSONNEL INJURIES NUMBEff OESCBIPTIONQ41 8

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Qo NA METHOD OF DI S CO V 8 RY L~JQI 45 46 45 NA LOCATIONOF RELEASE Qs DISCOVERY DESCRIPTION

~32 Found by a painter 80 80 80 80 1

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8 O

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10 NAME OF PREPARER 9

11 12 LOSS OF Of1 DAMAGE To FACILITYQ43 TYPE

DESCRIPTION

Z Q42 NA 9

10 PUBLICITY ISSUED DESCRIPTION~

~NQ44 NA 790523033,(-]

68 69 PHONE:

NRC liSt: ONLY 80 llllllli 0

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.LER SUPPLEMENTAL INFORMATION BFRO 260 /

? 905 Technical Specification Involved

3. 9. B Form BF-17 BF 15e 2 6/09/78 Reported Under Technical Specification

3. 9.B. 4 Date of Occurrence 4I>a/7>

Time of Occurrence 1~0:OO

.,e. Unit 2

Identification and Descri tion of Occurrence:

A broken terminal was'found on shutdown board D battery, cell no.

30.

The terminal was almost entirely broken which would have made the battery inoperable. if it had broken completely.

1 Conditions Prior to Occurrence:

~ e U-1 100%

U-2 96% - Normal operating conditions existing.

U-3 99%

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

Describe.

Resident NRC inspector was notified at 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br /> 4/19/79 in accordance with 3.9.B.4.

~A arent Cause of Occurrence:

Probably due to incorrect torquing of the battery terminal.

Analysis of Occurrence:

The lead battery terminal. of cell No.

30 was cracked almost o the point

.~;i.ure.

The ap"arent

cause

was using only one wrench to t'ghten the terminal causing stress to be applied.

Corrective Action

The cells involved were replaced.

Personnel was instructed as to proper methods for torquing the terminals.

Failure Data:

None Tennessee Valley Authority - Browns Ferry Nuclear Plant