ML18269A112

Engine Systems, Inc. Report No. 10CFR21-0122, Rev. 0 - 10CFR21 Reporting of Defects and Non-Compliance

ML18269A112
Person / Time
Site:	Catawba
Issue date:	09/12/2018
From:	Woolard S Engine Systems
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML18269A112 (4)

Text

ENGINE SYSTEMS, INC.

175 Freight Road Telephone: 252/977-2720 Rocky Mount, NC 27804 Fax: 252/446-1134 September 12, 2018 U.S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555-0001

Subject:

10CFR21 Reporting of Defects and Non-Compliance -

Engine Systems, Inc. Report No. 10CFR21-0122, Rev. 0 Motor Operated Potentiometer P/N 72-07900-100-ESI

Dear Sir:

The enclosed report addresses a reportable notification on a Motor Operated Potentiometer, P/N 72-07900-100-ESI.

A copy of the report has been mailed to our affected nuclear customer.

Please sign below, acknowledging receipt of this report, and return a copy to the attention of Document Control at the address above (or, fax to number 252/446-1134) within 10 working days after receipt.

Yours very truly, ENGINE SYSTEMS, INC.

Susan Woolard Document Control Please let us know if ANY of your mailing information changes - name of recipient, name of company/facility, address, etc. Mark the changes on this acknowledgment form and send to us by mail or FAX to the number above.

RECEIVED:

93 DATE:

Quality Performance With Pride

ENGINE SYSTEMS, INC.

175 Freight Road, Rocky Mount, NC 27804 Telephone: 252/977-2720 Fax: 252/446-1134 Report No. 10CFR21-0122 Rev. 0: 09/12/18 10CFR21 REPORTING OF DEFECTS AND NON-COMPLIANCE

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COMPONENT: Motor Operated Potentiometer P/N 72-07900-100-ESI SYSTEM: Emergency Diesel Generator CONCLUSION: Reportable in Accordance With 10CFR21 Prepared By: - - - - i . = - -~

i- ---~-*--------- Date: /~!8~

____,_q...,_,,_/1.:::....,z

~~neering .Manager Reviewed By: - - - ' - ___

~ {4Lr Quality Manager Date: ----=-9_);_2Ji_;3_

Quality Performance With Pride

Report No. 10CFR21-0122 Record of Revisions Page: 1 of 1 REV DATE PAGE DESCRIPTION 0 09/12/18 Initial issue.

I

Report No. 10CFR21-0122 1 Revision: 0 Date: 09/12/18 Page: 1 of 1 Pursuant to 10 CFR 21.21(d)(4), ESI is presenting the required information as follows:

(i) Name and address of the individual or individuals informing.the Commission.

Dan Roberts I John Kriesel Quality Manager Engineering Manager Engine Systems Inc. Engine Systems Inc.

175 Freight Rd. 175 Freight Rd.

Rocky Mount, NC 27804 Rocky Mount, NC 27804 (ii) Identification of the basic component supplied within the United States which fails to comply or contains a defect.

Motor Operated Potentiometer, PIN 72-07900-100-ES/.

(iii) Identification of the firm supplying the basic component which fails to comply or contains a defect.

Engine Systems Inc.

(iv) Nature of the defect or failure to comply and the safety hazard which is created or could be created by such defect of failure to comply.

A batch of Motor Operated Potentiometers (MOPs) supplied by ES/ were found to contain motors that, as they accumulate run time, exhibit increasing current draw and eventually exceed the MOP circuit allowance. Consequently, the motor operation becomes erratic which leads to a sluggish MOP. The MOP is used in a safety-related system to control emergency diesel generator (EOG) output voltage.

Failure of the MOP to operate properly can negatively affect the EOG output voltage which affects associated components required to safely shutdown the nuclear reactor.

(v) The date on which the information of such defect or failure to comply was obtained.

July 19, 2018 (vi) In the case of a basic component which contains a defect or fails to comply, the number and location of these components in use at, supplied for, being supplied for, or may be supplied for, manufactured, or being manufactured for one or more facilities or activities subject to the regulations in this part.

Customer ES/ Serial C-of-C Part Number Customer Qty MOP Serial Number PO Number Date H01931980 H01995585 Duke Energy 72-07900-100-ESI 196046 6 3013905-1.1-1 thru 6 H01995582 H01995586 5/30/2015 Catawba H01995584 H01995587 (vii) The correctiv~ action which has been, is being, or will be taken; the name of the individual or organization responsible for the action; and the length o(time that has been or will be taken to complete the action.

ES/ will revise the test procedure to incorporate an extended run time while trending the motor for any adverse changes. This wi/1 be completed within 30 days and will prevent reoccurrence.

For Catawba, any MOPs from this batch are considered suspect and may be returned to ES/ for rework or replacement. For units installed, the motor performance should be assessed prior to continued use.

The voltage measured across terminals 3(-) and 4(+) while the MOP is operating should remain steady within a range of 22.8 to 25.2 VOC. Any step change or reduction in voltage is an indication of motor deterioration. *

(viii) Any advice related to the potential defect or failure to comply about the facility, activity, or basic component that has been, is being, or will be given to purchasers or licensees.

The root cause of the excessive current draw was found to be build-up of carbonaceous deposits between the commutator sections of the motor either from the carbon brushes, contamination, or a combination of the two. As the motor accumulated run time, the deposits propagated to the point of a low resistance path between commutator sections which are wired to the armature poles. This affected the magnetic field within the motor which had a direct impact on motor performance. ES/ has limited the issue to a single date code of motors supplied within a single batch of MOPs, as listed in the table above.