ML20085G301

AO BFAO-7322W:on 731009,reactor Water Level Switches L1S-3-203B & L1S-3-203C Exceeded Tech Spec Setpoint at Readings of 537.5 & 537.2 Inches,Respectively.Switches Recalibr & Frequency of Testing Increased to Every 2 Wks

ML20085G301
Person / Time
Site:	Browns Ferry
Issue date:	10/19/1973
From:	Eric Thomas TENNESSEE VALLEY AUTHORITY
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
References
BFAO-7322W, NUDOCS 8308240802
Download: ML20085G301 (2)

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TENNESSEE CHATTANOOGA, VALLEY AUTHORITY TENNESSEE MD,ff7f,;

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,bl October 19, 1973

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~. , d v w-2 us n V Mr. John F. O'Irary, Director L. 00TL)g29/Jg,$'

c:, ,3, Directorate of Licensing r,fPcf O Office of Regulation '# '\'

U.S. Atcclic Energy Co:nmission 9 f/;y#.ctf 4 '

7 Washington, DC 20545 cy j f 3 ,s \ '

Daar Mr. O'Icary:

TE:!IESSE3 VALICY AUTEORITY - ERCWI:S FERRY !!UCLEAR PLA';T U:!IT 1 -

DOCKET I:0 50-259 - FACILITY CPZR?.TII!G LICEI!SE DPR AE CIMAL Occur?s::cE REPORT EFAO-7322W The purpose of this report is to provide details concerning the malfunction cf two reactor water level' switches in unit 1 at Erovnc Ferry !!uclear Plant on October 9,1973 This occurrence was reported by telegram to the Region II Directorate of Regulatory Operations, Atlanta, Georgia, en October 10.

Deceription of tr.e Incident '

Daring routine furveillance testing on October 9, reactor vater level switches LlS-3-203E and C vere found to operate outside the technical g)ppecification tero as specified setpoint in tableof3equal 1.a. to Theoras-found 6reatersettings than 538" were above 537 5" vescel f and 537 2", respectively. Thece cvitcher are arranged in ene out of two taken twice logic in the Reactor Protection System. The other two channels were tested and fcuni to operate catisfcetorily. If

. k' 'fk required, the RPS logic would have performed its intended function.-

/T The reactor was in a cold shutdown condition.

t Investigation and Corrective Action These level switches are Earton r:odel 288A differential pressure l switches. The evitch mechenisms vere inspected for binding nicalicn~ents i or other irregularities. !ione were found. The switches were recalibrated l cnd then functionally tested several times to encure repeatability. A functional testing frequency of once every two veeks has been initiated and vill be continued until three consecutive tests prove entisfactory :

perfomance. At that time, the original tect schedule of once n month-8308240002

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2 Mr. John F. O'Incry October 19, 1973 TEI;;;EOSE3 VALLEY !.UTHORITY - L3CU:!S FERIE I!UCLEAR PL!L;T UNIT 1 -

DCCET : 0 50-259 - FACILITY CPERATIiG LICEI!GE DPR AENOR!AL CCCURECE REPORf EFAO-7322W will be resumed. We intend to install, as soon as possible, new locking suitchplate asce:nblies recently nade availabic by the vendor to prevent setpoint drift.

Very truly youro, TE:i:CS3EE VALLEY AUTHCRIT!

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['i E.Director F. Thonnoof Power Production CC: Mr. ?! omen C.1:oceley, Director Region II Regulatory Operations Office, USAEC 230 Peachtree Street, ITJ.

Atlanta, Georgia 30303 <

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