05000260/LER-1980-051-03, /03L-0:on 801121,reactor Water Level Switch 2-LIS-3-58C Switch 4 Found Inoperable at Proper Setpoint. Caused by Dirty Switch Contacts.Contacts Cleaned & Checked at Proper Setpoint

/03L-0:on 801121,reactor Water Level Switch 2-LIS-3-58C Switch 4 Found Inoperable at Proper Setpoint. Caused by Dirty Switch Contacts.Contacts Cleaned & Checked at Proper Setpoint

ML18025B262
Person / Time
Site:	Browns Ferry
Issue date:	12/12/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18025B261	List: 05000260/LER-1980-051, Forwards LER 80-051/03L-0 05000260/LER-1980-051-03, /03L-0:on 801121,reactor Water Level Switch 2-LIS-3-58C Switch 4 Found Inoperable at Proper Setpoint. Caused by Dirty Switch Contacts.Contacts Cleaned & Checked at Proper Setpoint
References
LER-80-051-03L-02, LER-80-51-3L-2, NUDOCS 8012220460
Download: ML18025B262 (4)

LER-1980-051, /03L-0:on 801121,reactor Water Level Switch 2-LIS-3-58C Switch 4 Found Inoperable at Proper Setpoint. Caused by Dirty Switch Contacts.Contacts Cleaned & Checked at Proper Setpoint

Event date:
Report date:
2601980051R03 - NRC Website

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~During heatup after a refueling outage while performing SI 4.2.B-l, reactor water level switch 2-LIS-3-58C switch 4 (LPCI initiation) was found not to operate at the proper setpoint.

(T.S. 3.2.B).

Redundant switches were operable.

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Previous events:

260/805, 260/ 80 I

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Tennessee Valley Authority Browns Ferry Nuclear Plant Form BF-l7 BF 15.2 I/10/79 LER SUPPLEMENTAL INFORMATION BFRO 260 /

8051 Technical Specification Involved 3.2.B Reported Under Technical Specification 6.7.2.b(l)

~i Identification and Descri tion'of Occurrence:

Unit

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2 During heatup after a refueling outage while performing SI 4.2.B-,1, level switch 2-LIS-3-58C switch 4 (LPCI initiation) was found not to operate at the proper set point.

Conditions Prior to Occurrence:

Unit 1 at '99% power Unit 2 startup after refueling Unit 3 at 84% power Action specified in the Technical Specification Surveillance Requirements met duc to ino erable e ui ment.

Describe.

Redundant switch in same trip channel and in redundant. trip channel were operable.

~Aarent Cause of Occurrence:

Dirty switch cbntacts.

Anal sis of Occurrence:

There was no damage to the plant equipment.

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

Corrective Action

.Cl'caned the switch and functionally tested at the proper setpoint several times.

Failure Data:

260/805, 260/801, and 259/7437.

~Retention:

eriod - Lifetime; Responsibility - Administrative Supervisor

• Revision:

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