ML20085M294
| ML20085M294 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 01/14/1974 |
| From: | Eric Thomas TENNESSEE VALLEY AUTHORITY |
| To: | Oleary J US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| AO-BFAO-7352W, NUDOCS 8311080174 | |
| Download: ML20085M294 (3) | |
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Mr. John F. O' Leary, Director Directorate of Licensing Office of Regulation U.S. Atonic EnerSy Cornission Washington, DC 20545
Dear Fr. O' Lean:
TEimESSEE VALLEY AUTIiORITI - BRO'US FERRY INCLEAR PIAIrf UNIT 1 -
DOCIGT 170. 50-259 - FACILITI OPERATIIIG LICEI!SE DPR ABI!ORMAL OCCURRENCE REPORT BFAO-7352W The enclosed report is to provide details concerning recirculation pump A d/p indicating switch nalfunction which occurred on Browns Ferry Nuclear Plant unit 1 on January 4, 1974, and is submitted in accordance with Appendix A to Regulatory Guide'l.16, Revision 1,..
October 1973 Very truly yours, h [~
TEIEESSE3 VALLIY AUTHORITI 5?
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,g Director of Poucr Production Enclosure CC (Enclosure):
Mr. Noman C. Poseley, Director Region II Regulatog Operations Office, USAEC 230 Peachtree Street, IM.
Atlanta, Georgia 30303
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O ABNORMAL OCCURRENCE REPORT Report No.--BFAO-7352W Report Date--January 14, 1974 Occurrence Date--January 4, 1974 Facility--Browns Ferry Nuclear Plant unit 1 Identification of Occurrence Recirculation pu=p A d/p indicating switch malfunction.
Conditions Prior to Occurrence Reactor was at 30-percent ther=ol power during startup testing.
During accelerated biweekly surveillance testing, PdIS-68-85 was found to operate outside the technical specification limit of less than or equal to 2 psid as specified in Table 3.2.B.
The switch operated at 2.2 paid.
Analysis of Occurrence Each PdIS switch cperates a relay having two sets of contacts, which.are arranged in a one out of two taken four times logic in each trip system of the LPCI break detection system. Theotherthreed/pswitchesonrecirculationpumpAwere tested and found to operate satisfactorila.
If the LPCI break detection has been required, it would have performed its intended function.
Corrective Action There were no apparent reasons for the setpoint drift. This instrument will be tested once a veck until three consecutive tests are satisfactory, at which time an accelerated frequency of biweekly will be resumed.
Evaluation of testing on the accelerated biweekly interval will be made before its normal test period ic resuned. Additionally, if possible, the instrument will be tested with the same personnel and test instruments during the accelerated tests. An offset to co=pensate for drift will also be added to the setpoint.
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Failure Data Barton Model 288 differentini pressure indicating switch.
Serial No. 288-4545 Switch Date Failure Corrective Action PdIS-68-85 11/26/73 Setpoint drift Installed new locking device PdIS-68-85 12/7/73 Setpoint drift' Replaced PdIS due to stripped locking device
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Serial no. 288-6379 Switch Date Failure Corrective Action PdIS-68-85 1/4/74 Setpoint drift Roset switch h
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