ML20085G727
| ML20085G727 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 09/24/1973 |
| From: | Eric Thomas TENNESSEE VALLEY AUTHORITY |
| To: | Oleary J US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20085G728 | List: |
| References | |
| BFAO-7313W, NUDOCS 8308290303 | |
| Download: ML20085G727 (2) | |
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TENNESSEE VALLEY AUTHOAITY MTT.
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September 24, 1973
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- ff fff Mr. John !. O' leary, Director Q'
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Directorate of Li 2nning 1,j Office of Regulation A"
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U.S. Atomic Energy Comnission
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Washington, DC 205h5
Dear Mr. O' leary:
TE!CIESSEE VALLEY AUTHORITY - EROWIIS FERRY I;UCI2AR PIluT U?IIT 1 -
i DOCTET Iio. 50-259 - FACILITY OPSRATING LICEI!SE DPR AE iORMAL OCCURRE !CE RSPORT BFAO 'l313W The purpose of this report in to provide details concerning the i
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malfunction of a differential pressure switch in unit 1 RCIC isolation logic at Browns Ferry I;uclear Plant on September 14, 1973 This occurrence was reported by telegram on September 14, 1973, to u
the Region II Directorate of Regulatory Operations, Atlanta, Georgia.
e Dercription of the Incident During routine curveillance testing on September 14, 1973, PdIS-71-1A vas found to operate outside the technical specification setting of c
equal to or less than 450 inches of water as specified in table 3 2.B.
i The as-found setting vac 457 inches of water.
The cwitch han two contacts in parallel that fom a trip logic in i
the trip system. The trip logic ccts to trip the RCIC turbine and isolate the system upon stera line high flow.
Since only 1 of the 2 channels is required operable and tne other channel tested i
satisfactorily, the logic vould have perfomed its intended function L
if required. The reactor was in the COLD, SRUTDOWN condition; and RCIC was not required.
g This is a Earton differeatial indicatin6 switch, Model 288, with a
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range of 0-to-500 inches of vater.
It was last runctionally tested i
on nagust 1*(,1973, and was found satisfactory. The switch was inspected for catisfcetory clearance and freedom of operation and e
was recalibrated allowing for instrument accuracy.
Several operations of the switch were perfomed to ensure operability.
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2 Mr. John F. 0 % ary September 2!+,1973 TENNESSEE V/.LLEY AUTl!ORITY - EROWNS FERRY HUCLEAR PIET UNIT 1 -
DOCKET NO. 50-259 - FACILITY OPERATIIC LICENSE DPR ABNORMAL OCCURRENCE RSPORT EFAo-7313W Thic instrument will be scheduled for testing once every two weeks until three concecutive tests prove caticfactory performance. At that. time, the original test schedule of once a month will be recumed.
Very truly yours, TENNESSEE VALIEY AUTEORITY Y
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E. F. Thcmas
' Director of Power Production CC:
Mr. Norman C. Moseley, Director e
Regicn II Regulatory Operations Office, USAEC 230 Peachtree Street, IF..'
Atlanta, Geor8 a 30303 1
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