ML20086J523

Telecopy AO 74-2:on 740729,refueling Floor Exhaust High Radiation Detector RIS-3-17-458D Found W/Trip Point in Excess of Tech Spec Value.Caused by Device Being Conservatively Set.Devices Reset

ML20086J523
Person / Time
Site:	Peach Bottom
Issue date:	07/29/1974
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086J521	List: ML20086J520 ML20086J523
References
AO-74-2, NUDOCS 8401240055
Download: ML20086J523 (2)

Text

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A* 17314 y} .$q a t. . W fIh 0-l]

, [ p .a q 5 July 29, 1974 20 Mr. Ja=es P. O'Reilly, Director -

United States Ato=ic Energy Co: mission l

. Directorate of Regulatory Operations  !

631 Park Avenue  ;

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King of Irusnia, Pennsylvania 19405 P

Subicet: Abnornal Occurrence 24-fiour UntJficatinn Confirming J. F. Fraur.' phone convercation with Mr. R. A. Feil, A.E.C. Regica 1 Regulatory Operations Office on July 29, 1974.

E

Reference:

Licence nuaber DPn-56 E Technical Specification Table 3.2.D

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_ Report Ho.: 50--273-74-2 -

E Report Date: July 29, 1974 5 Occurrence Date: July 29, 1974

• racilfty: Pesch Ectten Atcaic Po.cr Station R. D.1 Delta, Pennsylvania 17314 'j Identificat'on of Occurrence:

L ..

RIS-3-17-45SD refealin?,ficor exhaust high radiction detcetor

! was found to leve c. trip pai .t in exccon of the Tech Spec value -

y during it.ctrincat calibration.

E i Conditions Pric" to Occurrence: =

h Fuel lor.dici; of iuitial core in nrogrena.

E g Deecription of Occurrence:

e RIS-3-17-458D refueling fJoor exhaunt high radiation nonitor van E

, found to luve a trip point of about 24 rR/lla actual during instrt=ent calibration. Tcch Spec required cetpoint in 16 en/UR.

g- Dc:;ignation of Apparent Cauce of Occurrence: - '

_ The device had been conacrvatively cet to trip at 10.:R/ER indicated  %'

L value. During the calibration of the device vith an crternal source, -

2' E it ucc discovered that actual 16 c.n/T3 yicided an indicated value of .

[ 7nR/I'R. The dt.vice in a four-dr>r ncle 10 device crd thic re dig ic .  ;

g within the instrteent accurccy in percent of equivalent linear full '

ccnic. To prob]ca existo uith the inctru~tatation.

r-Analvsfs of Occurrence: -

d-Thic d vice is one inntrenent in a one-out-of-tt:0-tuice logic which '

inithtra a ventilation 1,ystes ino3ntion on refuellug floor exhaust -

? high rediation. Since th: re in no irrc&ted fuel in Unit 3, there

, is ao nituation uhich could create the initicting cignal. There are e no refety 1:plicctionn ansociated with thia tri , point deviation.

8401240055 74OsOg '

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~ ' i radiation were vt-t to trip at n taore conuervative iixlicated

& M value. Th milented value, when co parc< tho actual calibratio f p value, is significantly be the required actual 16 t..R/IIR in all cases.

Failure Data: .

Ths sane pr5b'Ic5 6cchir~ed on 'a ainilar detector' on Unit '2-~~~~

n nd ra u _repert ci.a tan _Abur aLO; turr enst_. ort 0c tober 29, 1973.

Very truly yours,

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W. T. Ullrich Superintendent Pccch Lottoa Accaic Pcuer Station

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