05000296/LER-1980-012-03, /03L-0:on 800509,while Performing SI 4.2.A-3,LIS- 3-56a Switch 2 & LIS-3-56b Switch 2 Failed to Operate.Caused by Stuck Switch Contacts.Switch Contacts Cleaned & Checked for Proper Setpoint

/03L-0:on 800509,while Performing SI 4.2.A-3,LIS- 3-56a Switch 2 & LIS-3-56b Switch 2 Failed to Operate.Caused by Stuck Switch Contacts.Switch Contacts Cleaned & Checked for Proper Setpoint

ML18025A907
Person / Time
Site:	Browns Ferry
Issue date:	06/06/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18025A906	List: 05000296/LER-1980-012, Forwards LER 80-012/03L-0 05000296/LER-1980-012-03, /03L-0:on 800509,while Performing SI 4.2.A-3,LIS- 3-56a Switch 2 & LIS-3-56b Switch 2 Failed to Operate.Caused by Stuck Switch Contacts.Switch Contacts Cleaned & Checked for Proper Setpoint
References
LER-80-012-03L-06, LER-80-12-3L-6, NUDOCS 8006110124
Download: ML18025A907 (4)

LER-1980-012, /03L-0:on 800509,while Performing SI 4.2.A-3,LIS- 3-56a Switch 2 & LIS-3-56b Switch 2 Failed to Operate.Caused by Stuck Switch Contacts.Switch Contacts Cleaned & Checked for Proper Setpoint

Event date:
Report date:
2961980012R03 - NRC Website

text

17 77 I CONTROL OLOCK:

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7 8

9 LICENSEE CODE CON'T [0

5 0

9 8

0 8

0 6

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Qo REPORT I L 1~10 5

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9 6

7 SOURCE 60 61 OOCKE I'UhIBER 68 EVENT DESCRIPTION ANO PROBABLE CONSEQUENCES QIO

[ During normal operation while performing 7

8 69 EVENT DATE 74

)5 REPORT DATE 80 S.I. 4.2.A-3 LIS 3-56A SW 2 and LIS-3-56B ll. 6 NUCI.EAR f(E(,'Ul.+rf)I>Y COMMISSlg<.

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iPLEASE PRINT OR TYPE ALLREQUIRED INFORMATIONI Q

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'Om~O 14 15 LICENSE NUMBER 25 26t LICENSE TYPE 30 57 CAT 58 SW 2 failed to operate contrary to T.S. 3.2.B.

Redundant'hannels were operable.

There were no significant resulting events.

There was no danger to health or safety I

of public.

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Previous occurrences

BFRO-50-"296/80010.

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'AUSE DESCRIPTION ANO CORRECTIVE ACTIONS 27 p

Cause of switch inoperability was attributed to stuck switch contacts.

Switch contacts were opened and then cleaned and checked for ro er set oi repeatability

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Yarway level indicating SW, Model 4418C.

Surveillance is to be increased until Yarway instruments are replaced by Rosemount alarm and tri units under DCR 1398.

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9 F AC I LIT Y STA'IUS POWER OTIIER STA'TUS I

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11 12 LOSS OF OA DAMAGE To FACILITY Qns TYPE l)ESCAIPTION Z

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10 PUIILICI TY ISSUED I)ESCRIPTION

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I'dnncssee Valley Authorit "Browns Ferry Nuclear Plant

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Form BF-.17 BF 15.2 1/10/79 LER SUPPLEMENTAL INFORMATION BFRO 296 /

8012 Technical Specification Involved Reported Under Technical Specification Date of Occurrence

/ /

Time of Occurrence Unit o

During performance of S.I. 4.2.A-3 LIS-3-56A switch 2 and LIS-3-56B switch 2

failed to operate.

Conditions 'Prior to Occurrence:

Unit 1 8 79%

Unit 2 8 98%

Unit 3 8 100%

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

Describe.

NA Apparent

Cause

of Occurrence:

Cause

of event was attributed to stuck switch contacts.

Analysis of Occurrence:

There was no damage to plant equipment.

There was no activity release, no personnel exposure or in)ury and no danger to the health or safety of the public.

Corrective Action

The switch contacts were opened and cleaned then checked for proper setpoint and repeatability.

1 ailure Data:

BFRO-50-296/80010

'"Reten tion:

~Revision:

eriod - Lifetime; Responsibility - Administrative Supervisor

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