ML20112F622

Amended Significant Deficiency Rept SD 414/84-20 Re NA1 Rotork Electric Motor Operators 14 & 16 Reported to Util by Rotork as Possibly Having Nitrile Thrust Base O-rings. Initially Reported on 840803.No Further Action Planned

ML20112F622
Person / Time
Site:	Catawba
Issue date:	11/29/1984
From:	Tucker H DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
SD-414-84-20, NUDOCS 8501150445
Download: ML20112F622 (3)

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DUKE,PowsRfEOMPANY

' ' P.O. DOX 33180 CHARLOTTE, N.C. 28242

. HAL B. TUGKER P2.04 reterinoxe nr

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'N'ovember 29, 1984 Mr.' James P. O'Reilly, Regional Administrator

.U. S. Nuclear _ Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Re: Catawba Nuclear Station Unit 2 rocket.No. 50 414

Dear Mr. O'Reilly:

.Please find attached an amended response to Significiant Deficiency No.

SD 414/84-20..- As a result of new information which is described in the Corrective Action, no further action is required on this item.

Very truly'yours, f.b. fM

}f Hal B. Tucker LTP/mj f.

Attachment ec:. Director Robert Guild, Esq.

Office of Inspection & Enforcement Attorney-at-Law U. S.' Nuclear Regulatory Commission P. - O. Box 12097 Washington, D. C. 20555 Charleston, South Carolina 29412 NRC Resident Inspector Mr._ Jesse L. Riley Catawba Nuclear Station Carolina Environmental Study Group 854 Henley Place Palmetto Alliance Charlotte, North Carolina.28207 21351s Devine Street.

Columbia, South Carolina 29205 INPO Records Center

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CATAWBA NUCLEAR STATION FOLLOW-UP TO REPORT NUMBER

• SD 414/84-20 REPORT DATE:

November 29, 1984 s

' FACILITY:

Catawba Nuclear Station Unit 2 IDENTIFICATION OF DEFICIENCY:

. A total of twenty-seven 14 and 16 NA1 Rotork Electric Motor Operators were reported'to Duke by Rotork as possibly having nitrile thrust base 0-rings.

The thrust base 0-ring material should have been viton. The deficiency was identified on August 3,1984.

INITIAL REPORT:

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.n August.31, 1984, H. Dance and V. Brownlee, NRC Region ll, Atlanta, CA O

were notified of the subject deficiency by W. O. Henry, T. L. Utterback, R. L. Oakley and J. H. Henkel of Duke Power Company, Charlotte, NC 28242.

COMPONENT AND/OR SUPPLIER:

notork Model 14NA1 and-16NA1 operators.

DESCRIPTION OF DEFICIENCY:

The twenty-seven operators supplied with nitrile thrust base 0-rings do not

- comply with the' environmental qualification report for the inside-containment model NA1 operator. The qualification report is based on tests of operators J.

using viton thrust base 0-rings. Nine operators are currently assigned to inside-and outside-containment applications (the remaining 18 are gpare), where environments can ' reach -3300F and ' radiation levels of 1.1x100 rads total Integrated dose.. The vitgn 0-rings have been tested to temperatures of 3400F and radiation levels of 2x100 rads in the thrust base application. The nitrile 0-rings have 3

not been tested to these conditions. From material publications, the nitrile material is -rated for only 2000F and lx107 rads.

. ANALYSIS OF SAFETY lHPLICATIONS:

Failure of these 0-rings would result in a loss of gear train oil, and subsequent loss of valve / operator function.

Operators furnished with nitrile 0-rings have not been qualified by environmental testing:and therefore cannot be relied upon to assure operability.

Section 3.9.3.2.2

',' Operability Assurance of Duke Safety-Related Active Pumps and Valves" of f

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the FSAR' requires that the operators for active valves be qualified by environmental qualification.

Tag numbers affected:

1KC425A, 2NV037A, 2KCC40B, 2SM074B, 2SM075A,

- 2SM0768,12SM077A, 2NC195B and 2NC196A.

18 spare. The spare operators l

could be used in a number of safety related applications.

CORRECTIVE ACTION:

All affected operators were to be returned to Rotork for enange-out of the 0-rings. Upon further investigation, Rotork has been able to determine at what point in time the use of nit = ie 0-rings took place. Rotork has determined that operators shipped pr3..r to December 1983 have the correct viton10-rings. All operators in question at Catawba were shipped prior to December 1983 and therefore will not-be returned to Rotork.

Operators.at McGuire shipped af ter December 1983 have been returned to Rotork and repaired.

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