05000296/LER-1980-013-03, /03L-0:on 800517,LIS-3-56B Switch 2 Failed to Operate.Cause Attributed to Stuck Switch Contacts.Leaf Switches Inside Level Indicating Switch Replaced & Checked for Proper Setpoint & Repeatability

/03L-0:on 800517,LIS-3-56B Switch 2 Failed to Operate.Cause Attributed to Stuck Switch Contacts.Leaf Switches Inside Level Indicating Switch Replaced & Checked for Proper Setpoint & Repeatability

ML18025A930
Person / Time
Site:	Browns Ferry
Issue date:	06/12/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18025A928	List: 05000296/LER-1980-013, Forwards LER 80-013/03L-0 05000296/LER-1980-013-03, /03L-0:on 800517,LIS-3-56B Switch 2 Failed to Operate.Cause Attributed to Stuck Switch Contacts.Leaf Switches Inside Level Indicating Switch Replaced & Checked for Proper Setpoint & Repeatability
References
LER-80-013-03L-03, LER-80-13-3L-3, NUDOCS 8006180520
Download: ML18025A930 (4)

LER-1980-013, /03L-0:on 800517,LIS-3-56B Switch 2 Failed to Operate.Cause Attributed to Stuck Switch Contacts.Leaf Switches Inside Level Indicating Switch Replaced & Checked for Proper Setpoint & Repeatability

Event date:
Report date:
2961980013R03 - NRC Website

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2 ~80 Q DOCK( T NUMBEfl F VENT DATE 74 75 REPORT DATE 80 EVENT OESCRIPTION AND PROBABLE CONSEQUENCES Q)0

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During normal operation while performing S.I.4.2.A-3 LIS-3-56B SW.

2 failed to

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~operate contrary to T.8.3.2.B.

Redundant channels were operable

. There were Lno significant resulting events.

There was no danger to health or safety of

public, Previous occurrence:

BPRO-50-296/80012.

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36 40 41 42 43 44 47 CAUSE DESCRIPTION AND CO{if{ECTIVEACTIONS 27 Cause of switch inoperability was attributed to stuck switch contacts.

Leaf setpoint and repeatability..

Yarway level indicating SW. Model 4418C.

Yarway instruments will be'replaced with analog trip system under DCR 1398.

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11 12 13 PEfiSONNEI INJURIES t(UIllBf!A DESCBIP (IONQ4)

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'v form -QF-.17 BF 15.2 1/10/79 LER SUPPLEMENTAL INFORMATION BFRO 296 /

80~3 Technical Sp cification Involved Reported Under Technical Specification 6

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Date of Occurrence

>/17/80 Time of Occurrence 0830 Unit Identification and Descri tion of Occurrence:

h During performance of S.I.4.2.A-3 LIS-3-56B switch 2 failed to operate.

Conditions Pr ior to Occurrence:

Unit 1 6 90%

Unit 2 6 100%

Unit 3 9 100%

Action specified in the Technical Specification Surveillance Requirements met NA

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Cause

of Occurrence:

Cause of event was attributed to stuck contacts.

~Ai fO There was no damage to.plant equipment.

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

Correctiv'e Action:

The leaf switches inside the level indicating switch were replaced then 'checked for proper setpoint and repeatability.

Failure Data:

BFRO-50-296/80012

+Retention:

eriod - Lifetime; Responsibility

- Administrative Supervisor

~Revision:

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