ML20125C716
| ML20125C716 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley, Monticello, Calvert Cliffs, Davis Besse, Mcguire, Nine Mile Point, Palisades, Indian Point, Catawba, Harris, Wolf Creek, Saint Lucie, Grand Gulf, Cooper, Pilgrim, Arkansas Nuclear, Summer, Prairie Island, Seabrook, Brunswick, Limerick, Turkey Point, Vermont Yankee, Crystal River, Haddam Neck, Ginna, Waterford, Farley, Robinson, Clinton, South Texas, Yankee Rowe, Rancho Seco, Fort Calhoun, FitzPatrick, McGuire, Fort Saint Vrain, Shoreham, Crane |
| Issue date: | 12/07/1992 |
| From: | Wilkinson I LIMITORQUE CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| REF-PT21-92 NUDOCS 9212140046 | |
| Download: ML20125C716 (21) | |
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Limitorque Corporation I
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Telephone (804) 528-4400. FAX (804) 845-9736 f( W+$d>
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_J U. S. Nuclear Regulatory Commission Washington, D.C. 20555
SUBJECT:
Title 10 CFR Part 21 Notification Dated December 7,1992 SMB/SB-000, SMB/SB/SBD-00 Declutch System Anomaly 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 a potential defect in the SMB/SB-000, SMB/SB/SBD-00 Declutch System depending on Licensee operating conditions, 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 nuclear utility customers.
Signed:
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- 1. E. Wilkinson Vice President of Engineering LIMITORQUE CORPORATION Attachment 110030 kli 9212140046 921207
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December 7,1992 1 ~--------
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Subject:
l'otentially Reportable 10 CFR Part 21 Condition SMB/Sil 00r, SMB/Sil/SBD-00 Declutch System Anomaly u
Pin <r lu mIviced.that 1 imbrqur O mn.. nu hac discovered through artimtor testing.
7 that the possibility exists for malfunction of the subject actuators under certain conditions of seisir c excitation. This situation could potentially be reportable depending on the operating practices of the licensee. Therefore, pursuant to the requirements of Title 10 CFR Part 21, notiheation is herein provided of a potent al malfunction of the subject actuators.
i MenliDration.cMasic19nwatta!
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The affected components are the.'cclutching mechanisms in the SMB/SB-000 and m
SMll/Sil/SBD-00 actuators.
Natuieltf thelleftqj A. The llasic Defect When the actuator is vibrated in the vertical axis with sufficient auplitude ne.sr the natural frequency or the declutch spten'. oscillations of the declutch system can cause the motor to become disengaged. MOVs which are required to operate during such a seismic event may exhibit longer stroke times. The malfunction only occurs during the seismic
. sent. After the vibrations stop, the actuator will return to proper operation.
The SMB/SB/SBD-00 and the SMB/SB-000 share the same basic design of declutch system which consists of the declutch lever, shaft, declutch fork, clutch ring, clutch keys, return spring, and tripper lever assembly. The system is imbalanced in the vertical axis because the declutch lever exerts more counter-clockwise torque on the shaft than the other parts exert in the clockwise direction. Thus, the lever can provide a driving force causing the decimch system ;o oscillate with enough amplitude to disengage the motor.
1
Page 2 -
l December 7,1992 lat 21 Notification D. Defect Observed in SMB/S"/SBD-00 Limitorque has on two occasions experienced malfunctions of the SMB/SD/SBD-00 declutch mechanism during seismic testing The type of test performed was a scismic dwell
- est. In this test the actuator was vibra:ed at frequencies from 2 bz to 32 hz in one quarter octave intervals with a sinusoidal waveform in a single axis. The acceleration level was 7.6 gs except at some of the lower frequencic.s where limitations of the shaker t Ales prevented reachint; tha: level. At each frequency, the actuator was vibrated for fifteen seconds.
During each of these Gtteen second dwells, the actuator was electrically operated simulating a close ad open valve stroke. This proccdure was performed with vibrations in the vertical axis of the octuator and in two horizontal axes.
On the occasions in which the malfunction was observed, the actuators would not complete a stroke cicetrically in the expected amount of time d zring the scismic dwell. The problem was only found in the vertical axis, the units operated correctly in the horizonta axes. Fudher, the problem wrs only found at two specific vertical dwdl frequencies: 11.3 mnd J33 b7m The.p.n.$5 nLwatnot.scen at tbc 9,5.b7. Jest an.d. lower Og.ncies.cor wm it.--.
seen at the 16.0 bz test and higher frequencies.
Limitorque has testM 9MB-00 ac*uators in the manner described above on seven occasions. Refer to the tabk ;elow for a summary. Of these seven te? 1, the declutch problem was seen in two of the tests (numbered 4 and 6 below). Note that in test 6 the arnplitus of the fundamental frequency did not reach 7.6 gs at either 11.3 or 13.5 hz but therc were spikes of 15 gs present on the waveforms due to difficulties ir controlling the seismi" table. Due to these spikes, test 6 may have bem more severe with respect to exciting the declutch system than the other tests which had clnner waveforms.
SMB-00 Seirmic Tests Pertinent to Declutch Problem Declutch Test Date Acceleration at Frequencies of Interest Pr cibl em Frequencles 1
none 12/19/80 7.6 ss et 11.4 ha and 13.6 ht
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none 4/*4/81
..o os at 11.4 h2 and 13.6 hr 3
none 2/3/83 7.6 ss at 11.4 hz and 13.6 ha 4
11.3 bz 9/23/90 7.6 gs at 11.3 hr and 13.5 hz 5
none 1/8/91 7.6 ss at 11.3 hr and 13.5 ha 6
11.3, 13.5 hr E/22/91 see hote 1 7
une 1/23/92 7.6 ss at 11.3 hr and 13.5 hr kote 1 toring test #5 the fwaecntal fine.nCY reBChed Bn DFplitude of 6.5 os at 11.3 hr and 7.5 es at
~.5 hz. Howver, at both of ther.e fregaencies there were spikes of 15 gs present on the wav6 forms de. to difficulties in controlling the selt.ait table.
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December 7,1992 4
Peut 21 NotiDeation C. Defect Observed in SMB/SB 000
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Limitorque is aware of a similar malfunction in the SMB/SB-000 declutch mech:mism f
duiing a utility sponsored seismic test. The type of test performed was a sine beat test. In this test the actuator was vibrated at frequencies from' 2 hz to 35 hz in one third octave l
intervals with sine beat excitation of 15 cycles per beat in a single axis. Each sine beat test at each frequency consisted of a continuous train of sine beats with no pause between beats.
The acceleration level was 4.5 gs except at some of the lower frequencies where limitations i
of the shaker table prevented reaching that level. At each frequency, the actuator was vibrated for a minimum of fifteen seconds. During each Dfteen second test, the actuator was -
clectiically operated simulating a close and open vr.lve stroke. This 3 xedure was i
performed with vibrations in the vertical axis of the actuator and in two horleontal axes.-
i The SMB 000 tested was reported as yerating intermittently during the 12.5 hz and 16.0 hz tests in tM vertical axis. The accelerat.on level reached 4.6 and 4.8 gs respective during these tests. After the first 16.0 hz test, the declutch lever was prevented from mibm003.ht furthe !c.sts by.being taped lo_the.bandwbwl,..Tbss. it.is Snknowwhether the.
problem would have occurred at the next highest frequency (20.0 bz). It is known that the problem was not seen at the 10.0 hr test and lower frequencies. And, in the horizontal axes the unit operated correctly (the lever was not taped during these axes).
l D. Critical Frequencies Based on the above tests, um potential exists for this malfunction to occur in the SMB/SB/SBD 00 at frequencies between 9.5 and 16.0 hz. This represents a rmtximum range of critical frequencies of three quarters of an octave. The SMB/SB-000 declutch system should have a similar frequency range due to its simihtrity with the SMB/SB/SBD-00 system.
For a conservative estimate of the highest potential problem frequency in the SMB/SB-000 it is calculated timt three quarters of an octave above 12.5 hz is 21.0 hz. Thus, the potential exists for this malfunction to occur in the SMB/SB-003 at frequencies between 10.0 and 21.0 hz.
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4 Limitorque does not have adequate data to determine the minimum acceleration level l
which could potentially cause the inalfunction. Note that the malfunction only occurs during the seismic event. After the vibrations stop, the actuator will return to proper operation.
E. Actuator Output Torque Can Prevent Malfunction In the observed cases of this malfunction, the actuators had minimal torque load
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present. When torque load is present, su loads are applied to the clutch keys and the side loads in turn generate frictiona' forces. Tase frictional forces oppose clutch key movement and thus inovement of the declutch sy wm. This is observed, for example, when an actuator is declutched while under valve seating load. Much more force must be applied to the declutch lever than when the valve is in an unloaded condition. The driving force causing oscillations of the declutch system la due to the imbahnce of the sys'.em as the actuator is
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Page 4-December 7, 992 Part 21 Notificsion ncelerated veitically. If sufficient torque load is present,.the frictional forces on the clutch -
keys will be high <.nough to oppose the driving force due to the imbalanced lever and oscillations of the system wul be prevented. At higher acceleration levels more driving force is generated W w hymr torque load is required to prevent oscillation.
Limitorquu has performed calculations comparing the frictional key forces to the driving force to determine how much torque load is required to prevent shaft oscillations at a given acceleration level. In order to provide a conservative margin of safety and allow for uncerttinties in the calcelations, a factor of safety of apploximately 4 is meluded in the resulting formulas forque is measured in ft lbs and Accelcration is measured in gs.
SMB/SB-000 j
Torque = 4 x Acceleration I
SMB/SB/SBD-00 i
Torque c 7 x Acceleration
!!xamp!c: For an SidIb000 undergoing a scismic event cf 7.6 gs maximum acceleration the torque calculated is 30 ft lbs. For an SMB 00 at the same acceleration level the torque calculated is 53 ft lbs.
These calculations may be used to provide assurance that an actuator will be able to l
open a valve from the torque seated condition to a point et which the opening torque drops to i
the level calculated.
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MfrsicUrdprME1 The equipment affected are SMB/SB/SBD-00 and SMB/SB-000 actuators.
l Limitemuelsnmatimletrfetive Actim i
To correct this problem, Limitorque has designed a declutch lever which balances the torque of the other components in the declutch system. With this lever installed, there is no l
l imbalance in the system and thus no driving force to cause oscillations. Levers have been riesigned for the SMB/SB/SBD-00 ud for the SMB/SB-000; Such a lever was installed -
doring the course of the SMB-00 test 6l mentioned above. This cured the declutch problem in that test. Also, one of these levers was present in a test of an SB-00 and no declutch prob!cm was observed.
Limitorque will make the new levers standard for future orders of SMBiSB/SBD-00 am. oiB/SB-000_ units for nuclear service. L ever availability is scheduled during the first quarter of 1993.
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l Pas;e 5' December 7,1992 Part 21 Notification LittarLCaradhi/Ali2Q
- Lhnitorque recommends that cach licensee evaluate this situation based on the potential of actuator malfunction at the frequencies mentioned above. If a specified valve stroke time is required, it must be assumed that valve motica ceasce d +a -
ismic event which includes these frequencies in a vertical orientation relative to
.. ors. Therefore, the actual valve stroke time will be increased by the duration of the seisnue event. An i
exception to this is a situation in which the torque load on the actuator is sufficient to create enough frictional forces to prevent declutch shaft oscillations as describcd in section E.
above. In this case the actuator v/ill function as long as the torque load remains above the critical value.
Balanced levers may be purchased from Limitorque. For the SMB/SB/SBD-00 the new lever is part 0301-059 and for the Sh!B/SB-000 the new lever is part 0101-081. In the interim it is recommended that levers be secured to prevent potential movement.
- Acy qecsti?ns regrding th above notification may be di.rected te P. McQuihn,
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Nucicar/Special Projects Manager at (804) 528-4400 Ext. 714.
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I, E. Wilkinson Vice President of Engineering LIMITORQUE CORPORATION pc:
Mc. Mignogna Mr. Komsey Mr. R. Segca Mr. M. Logan Part 21 Notification File l
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Birmingham, AL 35291 American Electric Power Service Co.
Section Mgr. Audik & Procurement P. O.Txa 16631 Columbus, OH 43216 Arizona Public Service Company Michael Ferguson Supervisor of the Vendor Quality Department P. O. Box 52034 Phoenix, AZ 85072 Arkansas Power & Light Company Arkansas Nuclear One Station Purchasing -
P. O. Box 551 Little Rock,- AR 72203 Arkansas Power & Light Co npany Operations Assessment Supenntendent Route 3, Box 137G' Russellville, AK 72801 Arkansas Power & Light Company Engineering Support Supervisor Route 3, Box 137G Russellville, AK 72801 =
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Manager Quality Assurance Department Rocky Hill Road Plyneouth, MA 02360 Carolina Power & Light R. E. Lumsden Manager Quality Assurance P. O. Box 1551 Raleigh, NC 27602 Carolina Power & Light
- Brunswick Nuclear Project Department Manager Box 10429 Southport, NC 28461 Carolina Power & Light llarris Nuclear Project Department Manager Box 165 New 1Ii11, NC - 27562 T
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-Robinson Nuctscar Project Department Manager Box 790 liartsville, SC 29550 Cleveland Electric illuminating Company E. Riley Director Quality Assurance P. O. Ilox 97 l
Perry, Oli 44081 Commonwealth Edison
-i Walter J. Shewski Manager Quahty Assurance P. O. Box 767 i
Chicago, IL 60690 Connecticut Yankee Atomic Power Co.
11addern Neck Plant D. B. Miller
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Station Superintendent-P. O. Box 127E East Ilampton, CT 06424 Consolidated Edison Company of New York
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Mr. Stephen Bram Vice President, Nuclear Power Broadway and Bleakley Avenue Buchanan, NY 10511 Consumers Power Company
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Duke l'ower Company E. M. Geddie Manager _ Nuclear Operations P. O. Box 33189 Charlotte, NC 28242 Ijuke Power Company Catawba Nuclear Station J. W. Hampton Station Manager P. O. Box 256 Clover, SC 29710 Duke Power Company McGuire Station T. L. McConnell Station Manager P. O. Box 488 Cornelius, NC '28013 Duquesne Light Company Beaver Valley Power Station C. E. Ewing Manager Quality Assurance P. O. Box 321, SEB3 -
Shippingport, PA 15077
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-i Arkansas Nuclear One Manager Industry Events Review p
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Site Purchasing Supervisor P. O. Box 1200 Jensen Beach, FL 34958 1200 Florida Power & Light Co.
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G. R. Westafer Director Quality Programs P. O. Box 14042
- St. Petersburg, FL 33733 Florida Power Corporation Manager Nuclear Procurement Engineering Services P. O. Box 219 Crystal River, FL 32623-0219 GPU Nuclear Corporation Three Mile Island Nuclear Station -
Ron Harbin Vendor Document Control P. O. Box 480 Middletown, PA 17057 Georgia Power Company I. Otis Berkham Vice President Procurement & Materials P. O. Box 4545 Atlanta, GA 30302 GPU Nuclear-l Anthony A. Cavallo, Jr./VDC P. O. Ilox 388 - Trailer 300C Forked River, NJ 08731 Gulf States Utilities T. F. Plunkett Plant Manager.
P. O. Box 220 St. Francisville, LA 70775-l-
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W. Kinsey Plant Manager P. O. Box 308 Bay City, TX 77414 Houston Lighting and Power Co.
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P. O. Box 289 Wadsworth, TX 77483 Illinois Power Company Clinton Power Station -
R. E. Campbell Manager Quality Assurance P. O. Box 678 Clinton, IL 61727 Indiana / Michigan Power Company Donald C. Cook Nuclear Plant W. G. Smith, Jr.
Plant Marager P. O. Box 458 -
Bridgman, MI 49106 lowa Electric Light & Power Company Gencial Of0cc E. G. Matthews Manager Quality Assurance Cedar Rapids, IA 51406 Long Island Lighting Company Shoremam W. E. Steiger j
Plant Manager P. O. Box 618 i
L Wading River, NY 11792 Louisiana Power & Light Company Waterford Nuclear Station N.S. Cams Plant Manager P. O. Box B, Highway 18 Killona, LA 70066 s
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l Division Manager Nuclear Operations P. O. Box 98 Brownville, NB 68321 New 11ampshire Yankee Records Management Department Supervisor P. O. Box 300 Seabrook, Nil 03874 New York Power Authority James A. Fitzpatrick Plant Resident Manager P. O. Box 4i Lycoming, NY 13093 New York Power Authority Indian Point Unit #2 i.
C. Mackay Operations Superintendent
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P. O. Box 215 Buchanan,' NY 10511 Niagara Mohawk Power Corporation -
Q.A. Building C-1 A. E. Winegard 300 Erie Boulevard West Syracuse, NY 13202
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^l Northeast Utilities Supervisor, Procurement QA P. O. Box 270 Ilartford, CT 06140-0270 Northern States Power Monticello Nuclear Plant W. Shamla Plant Manager P. O. Box 600 Monticello, MN 55362 Northern States Power Prarie Island Nuclear Station E. Watzi Plant Manager 1717 Wakouada Drive, East Welch, MN 55089 Omaha Public Power District I
Manager, Nuclear Licensing &
Industry Affairs,8E/EP4 444 South 16th Street Mall Omaha, NB 68102 2247-Omaha Public Power District Ft. Calhoun Nuclear Station L. T. Kusek Supervisor Operation -
P. O. Box 399 Ft.-Calhoun, NB 68023 Pacific Gas & Electric S. M. Skidmore 77 Beale Street - Room F 1800 San Francisco, CA 94106 l
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A. R. Sabel Manager Nuclear Quality Assurance Two North Ninth Street Allentown, PA 18101 Philadelphia Electric Limerick Station Brian Curry P. O. Box A, Sanatoga Branch Pottstown, PA 19464 Philadelphia Electric Director Quality Assurance 2301 hiarket Street Philadelphia, PA 19103 Portland General Electric Mark Hoffmann Manager of NSRD 71760 Columbia River liwy.
Ranier, OR 97048 Public Service Company of Colorado Ft. St. Vrain Generating Station C. H. Fullers Plant Manager 16805 Weld County Road - 191/2 Platteville, CO 80651 Public Service Company of Colorado P. O. Box 840 Denver, CO 80201 Public Service Company of Colorado j-Nuclear Licensing Department l:
16805 Weld County Road 191/2 Platteville, CO 80651 1.'
Public Service Electric & Gas Company L
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Nuclear Department Manager - Mail Code N-14 P. O. Box 236 liancocks Bridge, NJ 08038 I
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Sacramento Municipal Utility District Rancho Seco Nuclear Plant 7.
Director of Quality Assurance 14440 Twin Cities Road Herald, CA 95638-9799 Southern California &lison D. E. Shull, Jr.
Manager Nuclear Oversight 23 Parker Street Irvine, CA 92718 South Carolina Electric & Gas Company V, C. Summer Nuclear Station A. R. Koon -
Manager Nuclear Licensing (830)
P. C. Box 88 l
Jenkinsville, SC 29065 Southern Company Services, Inc.
Nuclear Procurement Organizatica
. P. M. Varner P. O. Box 1295, Bldg. 40 Iverness r
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Birmingham, AL 3520!
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Skyway Tower Group Vice President Nuclear Engeering & Operations
- 400 N. Olive St., L.B. 81 Dallas, TX 75201 Toledo Iklison Company
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L. Ramsett Director Quality Assurance 5501 N. State Rt. 2 Oak Harbor, OH 43449 Toledo Edison Company Davis-Bessr Mail Stop 3043 Design Enge eering Manager 5501 N. State Roate 2 Oak liarbor, OH 43449 s
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W. P. h!urphy Vice President hianager of Operations Route 5, Ilox 169 Brattleboro, VT 05301 Virginia Power Company W. L. Stewart Vice President Nuclear Operations P. O. Box 26666 -
Richmond, VA 23261 Virginia Power Innsbrook Technical Center 5000 Dominion Boulevard Glen Allen, VA 23060 Washington Public Power Supply System D. S. Feldman hianager Plant Qa/QC P. O. Box 968 Richland, WA 99352 t
Westinghouse Electric Energy Systems Business Unit Chris Delsignore P. O. Box 355 Pittsburgh, PA 15230 Wisconsin Electric Power Company C. W. Fay Vice President - Nuclear P. O. Box 2046 hiilwaukee, WI 53201 Wisconsin Public Service Corporation Superintendent, Nuclear 1.icensing and Systems P. O. Box 19002 Green Bay, WI 54307-9002 L
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NON-LICENSEES Anchor Darling Valve Company George Knieser Quality Assurance Manager 701 First Street Williamspon, PA 17701 B & W Nuclear Serv %c Company Sub DasGupta Quality Assurance Manager 3315 Old Fotest Road - P. O. Box 10935 Lynchburg, VA 24506 BWR Owners' Group GE Nuclear Energy Wendell G. Fiock Senior Program Manager 175 Curtner Ave., MC 382 San Jose, CA 95125 Contramatics Charles S. Guarneri Quality Assurance Specialist 222 Roberts Street East 11artford, CT 06108 Edwards Valve Inc.
Rafiq Bandukwala
. Quality Assurance Manager 1900 S. Saunders Street Raleigh, NC 27603-Henry Pratt Company Bruce Cummins Quality Assurance Manager
- 401 S. Highland Avenue Aurora, IL 60507 U
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