ML20085M516
| 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: |
| References | |
| AO-BFAO-7344W, NUDOCS 8311080616 | |
| Download: ML20085M516 (2) | |
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TENNESSEE VALLEY AUTHORITY C"*19 ?" f*\\-
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Mr. John F. O' leary, Director
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Directorate of Licensing Office of Regulation y"IN U.S. Atouic Energy Co:niscion 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-accordance with Appendix A to Regulatory Guide 1.16, Revision 1, t
l October 1973 Very truly yours, 1
TEUNESSEE VAIlff' AUTHORITY:
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l E. F.-Thomac 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 the primary containment isolation control system. The other 15 switches
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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-e 4
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