ML20085M516

AO BFAO-7344W:on 731130,during Startup Testing,Main Steam Line High Flow Pressure Switch PdIS-1-25D Malfunctioned. Caused by Faulty Indication.Pressure Switch Replaced

ML20085M516
Person / Time
Site:	Browns Ferry
Issue date:	12/07/1973
From:	Eric Thomas TENNESSEE VALLEY AUTHORITY
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20085M518	List: ML20085M516 ML20085M520
References
AO-BFAO-7344W, NUDOCS 8311080616
Download: ML20085M516 (2)

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Mr. John F. O' leary, Director Directorate of Licensing

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i Office of Regulation U.S. Atouic Energy Co:niscion y"IN Washington, DC 20545

Dear Mr. O' Leary:

TSNIESSEE VALIEY AUTHORITY - EROWNS FERRY NUCLEAR PLANT UHIT 1 -

DOCKET NO. 50-259 - FACILITY OPERATING LICENSE DPR AENOMAL OCCURRENCE REPORT LFAO-734Mi The enclosed report is to provide details concerning n main steamline high-flow pressure switch malfunction Q ich occurred on Browns Ferry Nuclear Plant unit 1 on November 30, 1973, and is submitted in-t accordance with Appendix A to Regulatory Guide 1.16, Revision 1, l October 1973 Very truly yours, 1

TEUNESSEE VAIlff' AUTHORITY:

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ks E. F.-Thomac Q7xc#

l Director of Power Production Enclosure ~

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Mr. Norman C. Moseley, Director-

!' . Region-II Regulatory Operations Office,. USAEC l 230 Peachtree Street, Inl. ~

! '- -Atlanta, Georgia -30303 -

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ABNORMAL OCCURRENCE REPORT

. Report No.--BFAO-73% W Report Date--December 7,1973 Occurrence Date--Hovember 30, 1973 Facility--Browns Ferry Nuclear Plant unit 1 ,

Identification of Occurrence Unit 1 main steamline high-flow pressure switch malfunction.

Conditions Prior to Occurrence j Reactor was at 25-percent thermal power during startup testing.

ll Description of Occurrence During routine daily instrument checks, main steamline high-flow pressure I

switch PdIS-1-25D was found not indicating correctly.

Analysis of Occurrence One switch from each of the four steamlines is connected in a series to establish one trip logic in a one out of two taken twice trip system in

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the primary containment isolation control system. The other 15 switches were indicating correctly.

Corrective Action A replace =ent differential pressure switch, Earton Model 278, was installed, calibrated, functionally tested, and placed in. service. A bench test of the failed switch indicated that the low-pressure bellows was leakira.

Failure Data .

Barton Model 278; serial No. 278-2990.

Switch Date~ Failure Corrective Action 1 PdIS-1-25D 11/30/73 Faulty indication- ~ Replaced' pressure switch-

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