ML19344B396

Deficiency Repts SD 369/80-17 & 370/80-12 Re Improper Operation of E-max Instruments,Inc Model 175C141 Optical Isolator When Driving Loads W/Greater than 1 Amp Inrush Current.Parts Will Be Replaced W/Model 175C146

ML19344B396
Person / Time
Site:	McGuire, Mcguire
Issue date:	10/10/1980
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
10CFR-050.55E, 10CFR-50.55E, NUDOCS 8010200525
Download: ML19344B396 (2)

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.Mr.!! James'P.'0'Reilly, Director ~

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Re: ; McGuira Nuhlear Station

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Dear Mr. O'Reilly:

. Pursuant.to 10CFR 50.55e please. find attached 3tanificant Deficiency

-Report SD.369/80-17, 1.0/80-12.'-

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-Willias O. Parker, Jr.

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. Ft.CI LITY: ~ McGuire. Nuclear Station Units 1 and -2

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-.j IDENTIFICATION OF DEFICIENCYi. ' improper ' operation of optical isolator.

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INITIAL' REPORT:

.On September 12,1980, 'Mr. McFarle,id of Region II~ was; notified L.

3 of. this deficiency by Mr. J. R. Wells and Mr. T. C.'McMeekin of Duke Power L Company,eCharlotte, NC'

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,5jlPPLI ER/ COMPONENT:- LThe malfunction'ing opticalilsolators were part number p(accordance with!0 uke Power Specification:175C141,rsupplied by E-max Instr CNS-1338.00-00-0001.x

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DESCRIPTION- 0F DEFICIENCY::

During operation and -testing a number.of the subject l:i solators.falled to operate properly when driving ^1oads with greater than-Jone amp Inrush c arrent. - It has been determined that the one amp inrush '

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SAFETY-IMPLICATIONS: Fallure ~ of an-I solator.- : output to correctly respond to the inputs could prevent proper operation of a' safety function of that circuit.

LThe Isolation depability of these' devices Is-not affected by;the described deficiency.'

. CORRECTIVE ' ACTION - T All model 175C141 Isolators driv!ng. loads with excessive

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Inrush current will. be changed. out-with)lsola" tor part numberE175C146, of.'

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adequate current capacity. The only use of these isolators'-at McGuire is in' the staiidby' shutdown factlity; interface with the plant safety system. The-r change:outlls scheduled to be completed Lprior tolthe SSF. completion ~date.

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