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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I cci ' Director Office of(Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington,tD. C. 20555-7

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RjPONTNUN8ERi'SD.369/80-17h370/80-i2 E

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"%'4: . Ft.CI LITY: ~ McGuire. Nuclear Station Units 1 and -2 '

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

-model I.75Cl41.

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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 *

',s .3 L Company,eCharlotte, NC' 28242.

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

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DESCRIPTION- 0F DEFICIENCY:: During operation and -testing a number .of the subject

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il 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 '

y . current exceeds the capacity of this model isolator. '

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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 ~

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

adequate current capacity. The only use of these isolators'-at McGuire is in' the staiidby' shutdown factlity; interfacer with the plant safety system. The-

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change:outlls scheduled to be completed Lprior tolthe SSF. completion ~date.

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