ML18024A670

LER 79-001/03L-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

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: ML18024A667 ML18024A670
References
LER-79-001-03L-01, LER-79-1-3L-1, NUDOCS 7902120166
Download: ML18024A670 (4)

Text

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{7.77il LICENSEE EVENT REPORT CONTROL BLOCK:

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LICENSE NUIIABEA 7 8 9 LICENSEE CODE CON'T 7, 8 soURGE LLJQB 60 61 0 5 0 0 0 DOCKET NUMBEA 2 9 6 68 7

69 0 1 1 1 EVENT DATE

~79UOB 74 0

75 1 3 REPOAT DATE 7

80 0

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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~o 28 ATTACHIBENT CODE 29 NPROC TYPE 30 PRIME COMP.

31 NO.

COMPONENT TAKEN ACTION 33 OIB ~QIB 34 ON PLANT

~Q20 35 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Q27 METHOD

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HOURS Q22 0 0 0 40 SUBhllTTED

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SUPPLIER 43 Q2S MANUFACTUAEA LYY 44 J ~Q26 47 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.

"0~0 7 8 9 80 FACILITY METHOD OF STATUS  % POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION Q32 CO S 2B 0 0 0 29 NA ~B Q31 Surveillance Testing 45 46 80 ACTIVITY CONTENT RELEASED OF RELEASE Z NA AMOUNT OF ACTIVITY Q ~NA LOCATION OF RELEASE Q36 Q33 ~ZQ34 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMIIEA TYPE DESCRIPTION Q39

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~ZOEE 12 13 80 PERSONNEL INJURIES NUMBEA DESCAIPTIONQ41 8

~oo o Q 12 77A 80 7 9 11 LOSS OF OA DAMAGE TO FACILITY TYPE DESCRIPTION Q43 9 L~JQ42 NA 7 8 9 10 80 o L~JQ44 PUBLICITY OESCAIPTION ~ NRC USE ONLY LltTlllllTTT:

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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