ML20086L527

Telecopy AO 74-10:on 740316,setpoint Shift Found on Switches PS-2-2-3-134C & 134D.Caused by Inability of Switch to Hold Precise Setpoints.Calibr Checked,Setpoint Reset & Checked in Accordance W/Surveillance Test

ML20086L527
Person / Time
Site:	Peach Bottom
Issue date:	03/18/1974
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086L524	List: ML20086L519 ML20086L526 ML20086L527 ML20086L536 ML20086L538 ML20086L543
References
AO-74-10, NUDOCS 8402080295
Download: ML20086L527 (1)

Text

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lhrch 18, 3974 N

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y.r. Jaucc.P, O' 33y, Director thited Sintes Atozie. Energy Comission Nectornte of Regu3ntory Operationc 631 Park Avenue I

j Eing of Pruccias Penncyltarsia 19406 i

D.M eet:

Abnorm 1 Occurrence P'4-Hour liotification 7

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Confirc.ing Mr. F.leicchtrom's convercation with Mr. E. Erunner, 4.E.C, j

Region 1 Regalatory Operntions Office on )hrch 17s 1974.

Referencta 1.icence llun.bor DTR 44, /cenhent ) tup.ber 1, Technical Specification hble 3 2. A

!. Report lio.:

hD-277-74-10 1

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Import. Dat e:

Ihrch 18,19'?4 Occurrence Dste:

ihrch 16s 1974 hel)ity:

Pooch Botton-Atomic Power Station - Unit 2 i

R. D. 1 Deita Pennr.ylvania 17314 5

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P 3dentifiention of Occurrence Betpoint chirt a on PS 2-2-3-1340 and P5-2-2-3-134D which isolates i.

the nnin nican 31nec if preware drops btaov 850 psig when in the run rode.

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ConSitiona Prior to Occurrence:

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Plant stable at upproxinntely 3DW pover.

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Dr.ccription of Occurrence:

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Daring inctrur.ent curveiDance tentingc PS 2-2-3-1340 an$ PS-2-2-3-134D 1

trippu6 e oppro.xir.ately Sh pcic and 847 pcis rerpective)y inr, ten 6 of l

J. 650 prig en specified in the ' loch,Speen.

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Designation of Apy.orent Cause of Coeurrenco:

j Innbility of evitch to hold precice netpoints.

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halysis of Occurrences l

Setpoint chift of the nubject mediches vou'Jd not Inve defeated the

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logic to proGuce the required actionc.

'The operable witches in cach channe) vou)61mve caused trips r,t the proper seipuints.

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Seipoint chifte vere ninor enn have no safety inp'Jications.

F Corrective Actioni i

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'the onlibration was che:heS. netpoint recet and checked 5n accordu.ce

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vith the curveinance tect. The remaining cvitches in this logic were.

r checked ned found to b./ vithin the Tech Spec lititc.

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l Pnilure Datn:

Setpoint chift c hrrvo occurred on this type of cecitch in other opp'lientionc.

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b'. 7. UDrich. Daperintendent I

i Peneb Botto: Aton.ic Power Station i

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e4020e0295 740321

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