ML20086K421

Telecopy AO 74-57:on 741218,setpoint of HPCI Steam Line High Flow Switch DPIS-2-23-76 Found Outside Tech Spec Limits. Caused by Setpoint Shift.Switch Adjusted & Checked for Proper Calibr

ML20086K421
Person / Time
Site:	Peach Bottom
Issue date:	12/19/1974
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086K415	List: ML20086K412 ML20086K421 ML20086K437
References
AO-74-57, NUDOCS 8401270080
Download: ML20086K421 (2)

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, PHit.ADEI.PIIIA ELECTit!C COMPANY ww W ca6 b.wh Peach Detten Atemic Power Station Delta, Pennsylvania 17314 g 37N December [9,\'197 P d 2;x

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. 'j {~'n5f // h N y l'.r. James P. O'Reilly, Director

!!ntted States Atomic Energy Coent iton  :~I kg07 'jgN[AW d4 Directorate of Regulatory OperatLor..' .

631. Park Avenuo Q' f King of Prussia, Pennsylvanta 19406 . .. , ' W ,

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Subject:

Abncen.11 Occurrence 2'4-Hour No_ti,fj ca,t tyn ffkf Confircing R. S. Pleischmann's phone conversat ion with Mr. k' nit Patunack', '

A.E.C. P.cgion 1 Regulatory Operations Office un' December 19, 1974.

Reference:

License Uutber DFR-44 Technical Spectf tcation

Reference:

Table 3.2.11 Report No.: 50-277-74-37 Report Dato: December 19, 1974 Occurrence Date: Decc:::ber 10, 1974 Fact 11ty: Peach Bottom Atomic Power Station Delta, Pennsylvania 17314 j .

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3 IdentificatLon of Occurrence:

i: Setpoint of 11PCI steno lino high flow switch.dPIS-2-23-76, outside of Teclutical Specification IIcits.

k l Conditinns Prier to Occurrence:

The reo : tor van .at 100% power.

- Description of Occurrence

4 During a routine inntrument calibration surveillance test the netpolat of one of the llPCI ntene line high flow nen. morn, dPIS-2-23-76, was i found to have drif ted oucalde the limits allowed by the Technical Specif tent toni. The prc9ertbed actpoint for this device in Lers than or equal to 225 in. II20. The dev.tec van found to tr tp at 230.5 in. 112 0 .

Designntion of Apparent Cnune of Occurrence:

Setraint phlf t within the accuracy of the instrument.

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Analynla of Occurronce:

! The esafety implications are r;inttml. pince the netpoint nhtft van very crxill and the companion redundant r+wicch wan tested and found to trip

'within the Techulent Specification.11mitu.

1- Correct.tve Action:

i The switch was ndjuuted und . checked for proper calibration in acenrdance with I the applicabic wurvettlance c.m t . The companion nuitch w.in tunted nutinfnetarity.

!- The nubj ect uvitchen u til be placed on a conthly calibrat ton nchedulo instead of f the required Technicu t Spec tf lencion schedule of once every 3 months in on t' atte::ot to deteernino the reauon for thu .sutuo Lnt drif c.

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1 Abnorral Occur _renefl-Hmar ::otif (cat Ion Reyo rt I!o. 50-277-74-57 _

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One previous f ailure of thin avitch reported an A0-50-277-74-41. ->

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i Very truly yours. \g

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W. T. Ullrich, Superintendent f Peach Bottum Atomic Power Station. t*

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