ML19338E899

Significant Deficiency Rept SD 413-414/80-13 Re Improper Operation of Model 175C141 Optical Isolater, Initially Reported 800828.Isolators Will Be changed-out W/Isolator of Adequate Current Capacity.Change to Be Completed by 820101

ML19338E899
Person / Time
Site:	Catawba
Issue date:	09/26/1980
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 8010060281
Download: ML19338E899 (2)

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Duxz POWER COMPANY Powsm Duis.oixo 422 Socin Cnuncu Sruzer, CnAar.orrt R C.asa.sa witU = o. nnnen.sn. September 26, 1980 VsCE 88mttsetMT Tc6conome; Anta 7C4 Sf taas P800uCYtON 373 4083 l

Mr. J. P. O'Reilly, Director U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, Suite 3100 Atlanta, Georgia .'10303 Re: Catawba Nulcear Station Units 1 and 2 Docket Nos. 50-413 and 50-414

Dear Mr. O'Reilly:

Pursuant to 10CFR 50.55e, please find attached Significant Deficiency Report SD 413-414/80-13.

Very'truly yours,

- - - ~ LA .

lWilliamO. Parker,Jc.

RWO:ses Attachment cc: Director NRC Resident Inspector Office of. Inspection & Enforcement Catawba Nuclear Station U. S. Nuclear Regulatory Commission Washington, D. C. 20555 -

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CATAWBA NUCLEAR STATION REPORT NUMBER: 50 413-414/80-1 REPORT DATE: September 26, 1980 FACILITY: Catawba Nuclear Station Units 1 and 2 IDENTIFICATION OF DEFICIENCY: Improper operation of optical isolator model 175Cl41.

INITIAL REPORT: On August 28, 1980, Mr. John Rausche of .9egion II was notified of this deficiency by Mr. J. R. Wells and'Mr. J. E. Thomas of Duke Power Company, Charlotte, NC 28242.

SUPPLIER / COMPONENT: The malfunctioning optical isolators were part number 175C141, supplied by E-max Instruments, Inc., Englewood, Colorado, in  !

accordance with Duke Power Specification: CNS-1338.00-00-0001. I l

DESCRIPTION OF DEFICIENCY: During operation and testing a number of the subject {

isolators _ failed to operate properly when driving loads with greater than j one amp inrush current. It has been determined that the one amp inruth t

current exceeds the capacity of this model isolator. This deficiency I potentially affects approximately 57. of the isolators installed at the l Catawba Nuclear Staion.

SAFETY IMPLICATIONS: Failure of the isolator output to correctly respond to the input could prevent proper operation of a safety function of that circuit. However, the isolation capability of these devices is not affected by the described deficiency.

CORRECTIVE ACTION: All model 175C141 isolators driving loads with excessive inrush current will be changed out with isolator part number 175Cl46, of adequate current capacity. This change is scheduled to be completed by 1/1/82.

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