ML20086H871

Telecopy AO 75-35:on 750516,reactor Water Cleanup Sys High Temp Isolation Switch TS-2-12-99 Tripped at 215 F.Caused by Setpoint Knob Adjustment Inadvertently Moved.Switch Reset & Checked in Accordance W/Applicable Calibr Check

ML20086H871
Person / Time
Site:	Peach Bottom
Issue date:	05/16/1975
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086H854	List: ML20086H852 ML20086H871
References
AO-75-35, NUDOCS 8401200302
Download: ML20086H871 (1)

Text

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Peach ilottom AtonicxPowg\\Stationi(($(.3, MS4Mh' 1 f N Daltn, Pennsylyn O

O 17314 /

'l',ay 16, 1975

!Jr. James P. O'Reilly,CDirector Offico of Inspection.and. Enforcement.

Region 1

-United. States: Nuclear Regulatory Co= mission

.631 Park Avenue II.ing. of > Prussin>. Pennsylvanih. 19406......-

ubject:

- Abnomal-Occurrenci 24Lucur I;ntification.

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Confirning. J. Franr.'s phones conversation with Mr D.. I'aphton, Region 1, United

, States Nuclear. Regulatory..Co=.ission;.on May 16, 1975'..

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Reference:

Licence ??acbor.DPR-44

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Technict.1. Specification Reference.r Table.3.2'.A.

Report'No.:-

50-277-75-35 Report.Date:.-

May 16, 1975 Occurrence-Date:.u Idy 16,.'1975 -

Facility.:

Peach Cottoa Arc =Ic Powoc Station. -

R M.== a w =- =ma. D 1

D n%dn._ elta. Pennov3 vn.nin 17324 ',

wanwn ums -

m

.=

ddentification of Occurronec Reactor hater CIcanup. System tiigh.Temperatego Isolation Evi.tch.

ES-2-12-S'D tripped at 2150F.

Conditions. Prior. to 0::icurrenec:-

U.dL 2 as full power..

s Description of.0ccurronec::

During, n rcutina instrument. surveillance test, TS-2*12-99,. uns found.

to trip at a higher..cetpoint.thn.- its alicwblo linit o21400F.

Designation of.. Apparent. Cause of. 0ccurrence::

>..Yhe instrument..is. counted.on a Iccul.reck in nn open hallunyaAich has

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ibcen heavily travelled due.to pu=p naintenance work in the aren.

Tho sotpoint kach edjusttent protrudes fron the front of the devica and uas

'.,.. cppnrently inndverennr13 noved..

Anni'ysis of'Occurrencet.

-f Safety significance.-of this> incident'. is ninical,.. The f#nction of this

.' *>. switch is to prevent-daman,e.to the denineralizer resin frc r hi ;h t

,p,l '.gtcapercture byrico.intinn, the synten when the denineralicer inlot water f g>.t?,pupor.sture ronches 140"F.

tt;,.,'

< Cifricctive: Act'io'n:.. :.

2Si'

'Ihe'sbitch uns dn=ediutoIr reset-nnd. checked. in. necordance uith the Tf

, npplienble. calibration.. check type of surveillance tesOc. 9.-

g,,.,

h DO O

FailurciDatae.

S

[.'

One'previousr which occurred on t;cpt. 22, 1973....

V.-

Very m gMS,jc.~yly ycurs p.

<m W-m-rwmem 11.. T. U12rii. Sur,erintend..nts COPY SENT REGION

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