05000296/LER-1979-001-03, /03L-0 on 790111:switch on LIS-3-56B Failed to Trip Reactor Recirculation Pump Motor Generator.Caused by Misadjusted Switch on Yarway Model 4418CE.Switch Recalibr & Tested Satisfactorily

/03L-0 on 790111:switch on LIS-3-56B Failed to Trip Reactor Recirculation Pump Motor Generator.Caused by Misadjusted Switch on Yarway Model 4418CE.Switch Recalibr & Tested Satisfactorily

ML18024A670
Person / Time
Site:	Browns Ferry
Issue date:	01/30/1979
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18024A668	List: 05000296/LER-1979-001, Forwards LER 79-001/03L-0 05000296/LER-1979-001-03, /03L-0 on 790111:switch on LIS-3-56B Failed to Trip Reactor Recirculation Pump Motor Generator.Caused by Misadjusted Switch on Yarway Model 4418CE.Switch Recalibr & Tested Satisfactorily
References
LER-79-001-03L-01, LER-79-1-3L-1, NUDOCS 7902120166
Download: ML18024A670 (4)

LER-1979-001, /03L-0 on 790111:switch on LIS-3-56B Failed to Trip Reactor Recirculation Pump Motor Generator.Caused by Misadjusted Switch on Yarway Model 4418CE.Switch Recalibr & Tested Satisfactorily

Event date:
Report date:
2961979001R03 - NRC Website

text

NAG F 6 ~

{7.77il LICENSEE EVENT REPORT U.S.

P EAR REGULATORY COMIIISSION CONTROL BLOCK:

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60 61 DOCKET NUMBEA 68 69 EVENT DATE 74 75 REPOAT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Q10 Durin surveillance testin while the lant was shut down for refuelin a switch on (T. S. table 3. 2. B).

The redundant switch on LIS-3-56D was o erable.

Previous events:

259/7437 and 296/7724.

There was no hazard to the public health or safety.

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COMPONENT TAKEN ACTION ON PLANT METHOD HOURS Q22 SUBhllTTED FOAM SUB.

SUPPLIER MANUFACTUAEA OIB ~QIB

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~Q26 33 34 35 36 37 40 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Q27 o

The switch on a Yarwa Model 4418CE was out of ad ustment.

The switch was recalib~rate and functionall tested satisfactoril Since there has been onl three occurrenc~e of this type in 5 years, the roblem is classified as random and no recurrence control 3

action is planned.

7 8

9 FACILITY STATUS

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Form BF-lv BF 15.2 6/09/78 LER SUPPLEMENTAL INFORMATION BFRO 296 /

791 Technical Specification Involved Table 3.2.B Reported Under Technical Specification

6. 7. 2. b. 2 Date of Occurrence 1/11/79 Time of Occurrence 1400 Unit 3

Identification and Descri tion of Occurrence:

During surveillance testing while. the plant was shutdown for refueling, a switch on LIS-3-56B, which trips the reactor recirculati'on pump motor generator, failed to operate.

Conditions Prior to Occurrence:

The reactor was shut down for refueling.

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

Describe.

None A

arent Cause of Occurrence:

Instrument drift.

Anal sis of Occur'rence:

Since the redundant switch was operable, the reactor

shutdown, and the recirculation pump not operating, no'roblem was incurred.

Corrective Action

The switch was recalibrated and functionally tested.

Failure Data:

259/7437 and 296/7724.

Tennessee Valley Authority - Browns Ferry Nuclear Plant