ML20085M883
| ML20085M883 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 11/23/1973 |
| From: | Eric Thomas TENNESSEE VALLEY AUTHORITY |
| To: | Oleary J US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| AO-BFAO-7337W, NUDOCS 8311090439 | |
| Download: ML20085M883 (3) | |
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TENNESSEE VALLSY AUTHO AIT/ C""J]. /'
CHATTANOOGA, TENNESSEE 3740'I U I,21
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w7s v y N r Mr. John F. O'Learj, Director Directorate of Licensin5 Office of Regulation U.S. f.tomic Eaergy Cc=miscica Washin(; ton, DC 20545 Daar Mr. C 'Learj:
TEINESSEE V/1 LEY AUTHORITY - ERC*.!::S I'E!iRY ??UCLSAR PL/.' T UNIT 1 -
DCCICT !!O. 50-259 - FACILITY OPERATI:!O LICEZE JPR /2::OiM1 OCCUliRE: CE RSPCRT IFl.0-7337W The enclosed report is to provide deteils concerning AD3 peraissive, core cpray pump discharge prer. cure evitch calfunction which occurred on Brorac Ferrj ::uclear Plnnt unit 1 on 1:ovember 14, 1973, and is cubnitted in accord mce with Appendix A to iicculatory Guide 1.16, Revision 1, October 1973 Very truly yourc,
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' Director of Pcuer Productica Enclocure CC (Eaclocure):
Mr. I!orcaa C. ::oreley, Dircetor itcgion II Regulatcry O arr.ticas Office, USAEC
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q LJ l-ABNOWJd, OCCURRENCE REPORT Report No.--BFAo-7337u Report Date--Hovember 23, 1973 Occurrence Date--November 14, 1973 Facility--Browns Ferry Nuclear Plant unit 1 Identification of Occurrence Unit 1 ADS permissive, core spray pump discharge pressure switch malfunction.
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Conditions Prior to Occurrence Reactor'in startup mode,-less than 1 percent power.
Description of Occurrence-During routine surveillance testin6 on November 14, 1973, core spray pump discharge pressure switches PS-75-7 and 35 were found to operate outside the technical.
specification setpoint of 185 +,10 psi 6 as specified-in Table 3 2.B.
Both switches operated at 225 psi.
6 Analysis of Occurrence These switches operate relays in the ADS pemissive logie such that operation of one switch affects one of the two trip logics in both trip systems. Both of these switches affected the seme trip logic in both trip systems. The other two_ switches were immediately tested and found.to operate satisfactorily. Although the setpoint had drifted to 225 psic, the core spray pump discharge pressure is greater than 250 psig and, if required, the core cpray pump permissive logic for the ADS would have perfomed its intended function.
Corrective Action The switches were recalibrated and functionally tested several. times to verify repeatability. No problems could be found and the switches were returned to Ocrvice.
An accelerated testing frequency of once every -two weeks ~ has been established for all four_ switches until three consecutive tests prove satisfactory perfomance.
At that time, the original test schedule of.once a month iiill be reestablished.
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Failure'Datae Mercoid Model DA 7943-804 Serial Nos.:
PS-75-7 SD-12998 --
PS-75-35 SD.-12996 t
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SSitch-Date Failure Corrective Action PS-75-7 11/14/73 operated outside tech spec limit Reset switch to setpoint-PS-75-35 11/14/73 operated outside tech spec limit Reset switch to setpoint G
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