ML20084H418
| ML20084H418 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 08/23/1974 |
| From: | Eric Thomas TENNESSEE VALLEY AUTHORITY |
| To: | Oleary J US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20084H419 | List: |
| References | |
| NUDOCS 8305040131 | |
| Download: ML20084H418 (2) | |
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TENNESSEE VALLEY AUTHORITY LNt". E
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i,g Mr. John F. O'Ioary, Director g
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Dear Mr. O' Leary:
Q T-TENNESSEE VALLEY AUTHORITY - BROTIIS FERRY NUCLEAR FIANT UNIT 1 -
DOCKET UO. 50-259 - FACILITY OPERATING LICEUSE DPR AEHORI&L
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OCCURRENCE REPORT EFAO-50-259/7444W The enclosed report is to provide details concerning recirculation jet pump ricer differential pressure switch FdIS-68-17 malfunction and is submitted in accordance with Appendix A to Regulatory Guide 1.16, Revision 1, October 1973 This event occurred on Browns Ferry nuclear Plant unit 1 on August 13, 1974.
Very truly yours, TENNESSEE VALLEY AUTHORITY
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Director of Power Production Enclosure CC(Enclosure):
Mr.' Norman C. Moseley, Director Region II Regulatory Operatiens Office, USAEC 230 Peachtree Street, NW., Suite 818 Atlanta, Georgia 30303 Ip
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ABNORMAL OCCURRE!CE RE' PORT Report No.: BFAO-50-259/7444W Report Date: August 23, 1974 j
Occurrence Date: August 13, 1974 Facility:
Browns Ferry Nuclear Plant unit 1 Identification of Occurrence i
Recirculation jet pu=p riser differential pressure switch PdIS-68-17 malfunction.
Conditions Prior to Occurrence Reactor was at rated power during comercial operation.
Description of Occurrence Duringrouth.nesurveillancetesting,recirculationjetpumpriserdifferential pressure switch PdIS-68-17 was found to operate outside technical specification setpoint limit of $ 1.5 paid. The as-found setpoint was 2.0 paid.
Designation of A:marent Cause of Occurrence It was determined that the installed switch contact had malfunctioned and could not be adjusted to operate below 2.0 psid. This is consid,cred a random switch failure.
Analysis of Occurrence Switch PdIS-68-17 is one of four switches arrenged in one-out-of-two-teken-twice l{j logic, which ir. conjunction with reactor precaure, less than 900 psig and a 2-second time delay, activates the break detection logic and loop selection for
.i LPCI injection. The other three switches were functionally tested and found to operate satisfactorily. Thus the logic would have perforced its intended i
function if required.
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Corrective Action The malfunctioning switch contacts were replaced, calibrated to the setpcint, and functionally tested. The new switch contacts operated e itisfactorily and the switch was returned to service.
~ Failure Data Differenticipressureindicatingswitch,BartonModel288;S/N288-5540;. Range O to 10 psid.
This mode of failure has not occurred previously for this equipment.
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