ML19325C952

Part 21 Rept Re Potential Common Failure of SMB-000 & SMB-00 Cam Type Torque Switches Supplied Prior to 1981 & 1976. Vendor Recommends That Switch W/Fiber Spacer Be Replaced

ML19325C952
Person / Time
Site:	Susquehanna, Clinton, 05000000
Issue date:	09/29/1989
From:	Wilkinson I LIMITORQUE CORP.
To:	Office of Nuclear Reactor Regulation
References
REF-PT21-89-155-000 PT21-89-155, PT21-89-155-000, NUDOCS 8910180201
Download: ML19325C952 (11)

Text

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- Automoted Volve Actuotors and Jotkl for industry- - l b %d; $114 Woodoll Rood P.O. Dox 11018 Lynchburg, VA 245061018 N k Te4 phone-804 528-4400

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h September 29,'1989 t

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U. S. Nuclear Regulatory Commission

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Re: Limitorque Corporation j Part 21 Notification ,

Subject:

SMB-000 and SMB-00 Torque Switches Attention: Director, Nuclear Reactor Regulation Gentlemen:

Pursuant to the requirements of Title 10 of the Code .of Federal Regulations Part 21 herein provided is notification of potential common failure of SMB-000 and SMB-00 cam type torque switches supplied prior to 1981 and 1976 respectively, as detailed in the attached letter. In order to expedite the notification of the facilities affected, Limitorque has made simultaneous-written notice to both the commission and the attached list of

,s. nuclear utility customers.

Signed: .

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I. E. Wilkinson Vice President of Engineering LIMITORQUE CORPORATION

[Ed 8910180201 890929 -

PDR PT21 ENVLMIT s 89 PNV

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Limit @rque C@rp@rati@n A'utornoted Volve Actuotors and Jacks for Industty i

5114 Woodoll Rood. - P,0, Dox 11318- Lynchburg, VA 24506 1318.

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Telephone-804 528-4400

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, ' September 29,1989 meml a

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SUBJECT:

10 CFR Part 21 Notification s

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l - Gentlemen: .

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L: Please be advised Limitorque has concluded its evaluation of two SMB 000 torque switch  ;

L failures, at Clinton Nuclear Power Station and Detroit Edison's Fermi Unit No. 2. We L - have determined that these failures.do represent a potential common mode failure and:

g  ; are therefore a reportable defect in accordance with the Code of Federal Regulations Title

? '10, Part 21. .

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- Idantification~of Ranic Comoonent '

?The component of concern is the SMB 000 and SMB-00 cam type torque switch with fiber spacers under the contact bridge (see attachment #1).-

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Nature of the Defect u.

' A single 1SMB 000-torque switch failure occurred at _two plants as a result of the

stationary contact screws loosening on the side of the torque switch which had fiber -

Jspacers. The fiber spacers were installed on one side of the torque switch to provide equal spring pack compression in each direction to balance the torque switch.

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- 2 Page 2 . j September 29,1989

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. Part 21 Notification-- 1 Two types of failure modes have been reported. In one case only one screw came loose eliminating electrical continuity with the contact bridge resulting in a premature trip i point _ on the torque switch. The second et se occurred when both stationary contact screws loosened and the contact fingers were raised while continuity was maintained.

This resulted in a condition where greater spring pack compression was required before i the electrical contacts would open, in this case the electric motor went to locked rotor

_ before the actuator could produce sufficient output torque to break the torque switch contacts. In both cases, the stationary contact screws that loosened were on the contacts which had the fiber spacers. .

A simikar torque switch failure had occurred in 1980 at the Susquehanna Plant. At that time, it was hypothesized that the cause of the loosening of the contact screws was a result of the fiber spacen taking a set and releasing pre load from the contact screws, thus allowing the screws to loosen. At this time a Part 21 detennination concluded that this was not a reportable incident as it was a single failure of a component which had a large population in use in the industry. In response to this concern Limitorque'  ;

!. modified the torque switch design to replace the fiber spacers with additional metallic I

contact bridges to insure that no further difficulties would be encountered.

Eauinment Effeqtgd _

All EMB 000 and SMB-00 actuaton with cam type torque switches using the fiber spacer  ;

could potentially experience this type of failure. SMB-000 actuators with serial number l less than 326670 and SMB-00's with serial numbers less than 233218 were originally i l

manufactured with cam-type torque switches, using fiber. spacers. Any replacement

! torque switches which may have been purchase for SMB-000's after 1980 or for i' .SMB 00's after 1976 would not have included the fiber spacers and therefore do not '

l contain a reportable defect.

Licensee Corrective Action L Limitorque recommends that those SMB-000 and SMB-00 actuators with the cam-type L torque switch with fiber spacer be replaced. To date, we have received reports of three failures of this torque witch configuration which represents less than one tenth of one percent of the total population of these switches. Consequently, we are recommending that these switches be replaced during the next available maintenance period.

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i September 29,1989 Part 21 Notification

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The f.imitoraue Corrective Action L Limitorque modified the SMB-000 torque switch in 1980 and the SMB-00 torque switch ,

in 1976, therefore all new tortine switches manufactured after this period are not subject  ;

p to this problem.

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@ -In the event that you should have any questions concerning this report, please contact f either Rob Laird or Mike Bailey in our Nuclear Support Deputment at our Lynchburg

} facility. j l-Very truly yours,

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l I. E. Wilkinson l Vice President of Engineering LIMITORQUE CORPORATION Attachment L.

L cc: T. Mignogna

[ R. Kornsey 10 CFR 21 - 16 file i

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Attachment 01 l

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September 29.~1989 Part 21 Notification

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-Nuclear Plant R. G.' Bird

'J. Woodward V ., P. Nuclear ,

,. Plant Manager 800 Boylston Street

l. . Boston, MA 02199 1;. . Columbia,7AL 363191 -

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' Boston Edison-Company Alabama. Power Company Hawley F. Brannan

.J. W. McGowen Manager. Quality Assurance Mgr. Safety Audit & Engr. Department 1 Review 25 Braintree Hill Park P. O. Box 2641- Braintree, MA 02184 Birmingham, AL 35291 Carolina Power & Light

- American Electric Power Service R. E. Lumsden L. Company Manager Quality Assurance P. O. Box 1551 Section Mgr. Audits- & Raleigh, NC 27602 Procurement '

P. 0. Box 16631 Columbus, OH 43216 Cleveland Electric Illuminating Company '

E. Riley Arizona Nuclear Power Project Director Quality Assurance L. G. Papworth P. O. Box 97 Director QA/QC .

Perry, OH 44081 l

-P. O. Box 52034 - Mail Station i 4072-Phoenix, AZ 85072 Commonwealth Edison Walter J. Shewski Manager Quality Assurance Arkansas' Power & Light Company P. O. Box 767

- Arkensas Nuclear one Station Chicago, IL 60690 Purchasing '

P. O. Box 551 - Connecticut Yankee Atomic Power Little Rock, AR 72203 Company - Haddem Neck Plant D. B. Miller Station Superintendent

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Indian Point #2 P.-O. Box 1475

(' Baltimore,-MD J. A. Basile General Manager Nuclear Power Generation Buchanan, NY 10511

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Consumers Power Company Florida-Power & Light - Turkey F. W. Buckman Point Station i .Vice President,. Nuclear C. J." Baker j 212 West Michigan Avenue Plant Manager '

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Jackson, MI 48201 P. O. Box 4332 Princeton, FL 33032-Detroit Edison .

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Florida Power & Light -

S t. . i Nuclear Procurement Supv. Lucie Station 6400 North ~ Dixie Highway G. J.-Boissy Newport, MI 48166 Plant Manager P. O. Box 128 l Fort Pierce, FL 34954 b Duke Power Company M. S. Tuckman Station Manager Florida Power & Light 3i J. W. Dickey l Seneca, SC 29679 V. P. Nuclear Operations P. O. Box 14000 Juno Beach, FL 33408 Duke Power Company E.-M. Geddle-

? . Manager Nuclear Operations Florida Power Corporation u P. O. Box 33189 G. R. Westafer Charlotte,;NC 28242 Director Quality Programs P. O. Box 14042 St. Petersburg, FL 33733 Duke. Power Company -

Catawba L Nuclear Station J. W. Hampton GPU Nuclear Corporation -

Station Manager. Oyster Creek Nuclear Generating P. O. Box 256 Station Clover, SC 29710 P. B. Fiedler Vice President P. O. Box 388 Duke Power Company -

McGuire Forked River, NJ 08731 Station T. L. McConnell Station Manager GPU Nuclear Corporation - Three

P. O. Box 488 Mile Island Unit #1 l Cornelius, NC 28013 H. D. Hukill, Jr.

Vice President 1 I

P. O. Box 480 Duquesne Light Company - Beaver Middlett1wn, PA 17057 Valley Power Station C..E. Ewing Manager Quality Assurance GPU Nuclear Corporation - Three P. O. Box 321, SEB3 Mile Island Unit #2 Shippingport, PA 15077 F. R. Standerfer L Vice President P. O. Box 480 Middletown, PA 17057 1

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Georgia' Power Company Illinois Power Company -

I. Otis Berkham Clinton Power Station Vice President Procurement & R. E. Campbell i Materials .

Manager Quality Assurance  !

P. O. Box 4545 P. O. Box 678 Atlanta, GA 30302 Clinton, IL 61727 -

Georgia Power Company - Vogtle' Indiana / Michigan Power Company Plant - Donald C. Cook-Nuclear Plant G. Bockhold W. G. Smith, Jr.

General' Manager Plant Manager Old River Road P. O. Box 458 Waynesboro, GA 30830 Bridgman, MI 49105 .

i Georgia Power Company'- Edwin Iowa Electric Light & Power

,I. Hatch Plant #2 Company - General Office J. T. Bockham, Jr. E. G. Matthews Vice' President Manager Quality Assurance P. O. Box-439

-Baxley, GA 31513 Cedar Rapids,_ IA 51406 Gulf States Utilities Long Island Lighting Company -

T. F. Plunkett Shoremam Plant Manager. W. E. Steiger -

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'St."Francisville, LA 70775 P. O. Box 618 Wading River, NY 11792 Houston Lighting & Power i

Company -

Document Control Louisiana-Power & Light Company l_ Center - Waterford Nuclear Station ,

l N. S. Cams '

Plant Manager P. O. Box 1103 P. O. Box B, Highway 18 Houston, TX 77251 Killona, LA 70066 Houston Lighting & Power Maine Yankee Atomic Power Company - South Texas Project Company

! W. Kinsey C. D. Fritzle i Plant Manager Vice President Manager of

-P.,0. Box 308 Operations Bay City, TX 77414 Edison Drive Augusta, Me 04336

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L Nebraska Public Power Distiict -NoEtheast Utilities

• ' - Cooper Power Plant  !

G. R.-Horn . Supervisor, Procurement QA Division- ' Manager Nuclear P. O. Box 270 Operations Hartford, CT 06140-0270  :

P. O. Box 98 i Brownville, NB 68321  ;

Northern States Power -

Monticello Nuclear Plant New Hampshire Yankee W. Shamla T. Feigenbaum Plant Manager V. P. . of - Engineering and Quality Programs P. O. Box 600 P. O. Box 700 Monticello, MN 55362 Seabrook, NH 03874

, Northern States Power - Prarie L New York Power Authority -

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Supv. Procurement Quality Indian Point Unit #2 Assurance C. Mackay .1623 Harney Street Operations Superintendent Omaha, NB 68102 P. O. Box.215 Buchanan, NY 10511 f

Omaha Public Power District -

L Ft. Calhoun Nuclear Station L Niagara Mohawk Power L.-T. Kusek Corporation Supervisor Operation A. E. Winegard P. O. Box 399 Q.A. Building C-1 Ft. Calhoun, NB 68023 3001 Erie Boulevard West Syracuse, NY. 13202 Pacific Gas & Electric S. M. Skidmore Niagara Mohawk Power '

Corporation - Nine Mile Point 77 Beale Street - Room F 1800 T. J.-Perkins San Francisco, CA 94106-General Superintendent Nuclear Generation P. O. Box 32 Lycoming, NY 13093 l-'

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NQA-Procurement A2-2 -Company-A. R. Sabel Charles Johnson 4 Manager . Nuclear Quality General Manager Nuclear Quality j Assurance Assurance- i Two_ North' Ninth Street 80 Parks Plaza J Allentown, PA 18101 Newark, NJ 07101 Philadelphia Electric -~ Rochester Gas & Electric

. Limerick Station Corporation - Robert E. Ginna ,

' Brian Curry Plant J. C. Bodine <

P. O. Box A, Sanatoga Branch Manager Nuclear Assurance ,

Pottstown, PA 19464 1503 ' Lake Road-

- Ontario, NY 14519 L

i: Philadelphia Electric Sacramento Municipal Utility '

Director Quality Assurance District - Rancho Seco Nuclear 2301-Market Street Plant Philadelphia, PA 19103 .

Director of Quality Assurance 14440 Twin Cities Road Portland General Electric -

Herald, CA 95638-9799 Trojan Nuclear Plant C. A. Olmsted l Plant Manager Southern California Edison. ,

L Route 2,-Box 439 R. M. Rosenblum l- Rainer, OR 97048 Manager Nuclear Quality l Assurance L P. O. Box 800 l

Public Service Company of Rosemead, CA 91770 colorado -

Ft. St. Vrain Generating Station C. H. Fullers System Energy Resources, Inc. -

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P. O. Box 756 Public Service Company of Port Gibson, MS 39150 Colorado n R.'O. Williams Vice President Nuclear Tennessee Valley Authority lo Operations Daryl Cox l P. O. Box 840 WT7D197P-K Denver, CO 80201 400 W. Summit Hill Drive - 143 LB Knoxville, TN 37902 1

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- J.'F. Streeter A. J. Ruege Director Quality Assurance Supervisor Quality Assurance P. ' O. Box 2300 P. O. Box'19002 Glen Rose, TX 76043 Green Bay, WI 54307 Toledo Edison Company Wolf Creek Nuclear Operating L. Ramsett Corporation .

Director Quality Assurance .R. Grant 5501 N. State Rt. 2 Vice President, Quality Oak Harbor, OH 43449- P. O. Box 411 Burlington, KS 66839

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Route 5, Box 169 Route 3, Box 137G Brattleboro, VT 05301 Russellville, AK 72801 Virginia Power Company Arkansas Power & Light Company

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