ML20085G284
| ML20085G284 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 10/19/1973 |
| From: | Eric Thomas TENNESSEE VALLEY AUTHORITY |
| To: | Oleary J US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20085G286 | List: |
| References | |
| BFAO-7323W, NUDOCS 8308240766 | |
| Download: ML20085G284 (2) | |
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i_4 TENNESSEE VALLEY AUTHOMITY C~~3]\\-
4 CHATTANOOGA, TENNESSEE it a74cn u i
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.. U October 19, 1973
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Mr. John F. O' Leary, Directo.
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Directorate of Licensing
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U.S. Atc=ic Energy Co.nission efA '
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Dear Mr. O'Icary:
TEI."JESSF:: VAIET. AUTHORITY - BRO'd::S FE3RY KUCLEAR Pl.CT U:!IT 1 -
DCCKET !!O. 50-259 - FACILITI CPERI. TING LICz::SE DPR AEXCEFAL OCCUR?KiCZ EEP0ET EFAO-7323k' t
The purpose of this report in to provide details concerning the malfunction of two turbine condenser low-vacuum evitchec in unit 1 I
at Browns Fern uclear Plant on October 11, 1973 This occurrence n
i was reported by telegrem to the Region II Directorate of Regulato n i
Operations, Atlanta, Geor$ a, on October 12.
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Descriptica of th: Incident n
During routine curveillance _ testing on October 11, turbine condenser low-vacuum switches PS-2-1A and 1D vere found to operate outside the technical specification cetpoint of greater than or equal to 23 inches of cercury ac specified in Table 3 1.a.
Tne as-found vacuun readings vere 22.8 and 22 3 inches of mercury, respectively. The svitenes are arranged in a one out of two taken twice logic in the Reactor Protection System. The other two channels were tested and found to operate caticfactorily; and, if required, the RPS logic would have performed its intended function. The reactor vac in a cold shutdovn condition.,
Investigaticn and Corrective Action The nochanisms of_thece Earksdale vacuun switches, model DIT-H18SS, vere inspected for binding, misalignment, cr other irregularitics.
'/h Nonc vere found. The cvitchen vore recalibrated and then functionally f.
tected ccvercl tines to encure repeatcbility. A functionnl testing frec,uency of once every two veeks has been initiated for all four p.
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7772 COPY SEN1' REGION
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L) 2 1fi. John F. O'Ioag Cetober 19, 1973 TEli:!ESSEE VALUTI AUTECRITY - 3ROU:!S ICERY ITUCLEAR PLCT U? LIT 1 -
DOCKET I!C. 50-259 - FACILITY OPERATI!!G LICE!iSE DPR AE'iCPaL OCCURP3::C0 IEPORif EFAO-7323U switchec of thic RP3 function and vill be continued until three consecutive tecto prove satisfactory perfonnance. At that time, the ori inal tect schedule of once a conth will be recumed.
C Very truly yours, TE:!' E3SEE VALIIY f.UTI:C21~'Y f /,/ /
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E. F. Thomas
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Director of Power Productica CC:
l'r. ;iornan C.1:cceley, Director Region II Re6ulatory Cperations Office, USAEC 230 Peachtree Street, I"J.
.t'.ca:n, Cacrgic 30303 I
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