Information Notice 1993-23, Weschler Instruments Model 252 Switchboard Meters

Weschler Instruments Model 252 Switchboard Meters

ML031080024
Person / Time
Site:	Beaver Valley, Millstone, Hatch, Monticello, Calvert Cliffs, Dresden, Davis Besse, Peach Bottom, Browns Ferry, Salem, Oconee, Mcguire, Nine Mile Point, Palisades, Palo Verde, Perry, Indian Point, Fermi, Kewaunee, Catawba, Harris, Wolf Creek, Saint Lucie, Point Beach, Oyster Creek, Watts Bar, Hope Creek, Grand Gulf, Cooper, Sequoyah, Byron, Pilgrim, Arkansas Nuclear, Three Mile Island, Braidwood, Susquehanna, Summer, Prairie Island, Columbia, Seabrook, Brunswick, Surry, Limerick, North Anna, Turkey Point, River Bend, Vermont Yankee, Crystal River, Haddam Neck, Ginna, Diablo Canyon, Callaway, Vogtle, Waterford, Duane Arnold, Farley, Robinson, Clinton, South Texas, San Onofre, Cook, Comanche Peak, Yankee Rowe, Maine Yankee, Quad Cities, Humboldt Bay, La Crosse, Big Rock Point, Rancho Seco, Zion, Midland, Bellefonte, Fort Calhoun, FitzPatrick, McGuire, LaSalle, Fort Saint Vrain, Shoreham, Satsop, Trojan, Atlantic Nuclear Power Plant
Issue date:	03/31/1993
Revision:	0
From:	Grimes B K Office of Nuclear Reactor Regulation
To:
References
IN-93-023, NUDOCS 9303240274
Download: ML031080024 (23)

UNITED STATESNUCLEAR REGULATORY COMMISSIONOFFICE OF NUCLEAR REACTOR REGULATIONWASHINGTON, D.C. 20555March 31, 1993NRC INFORMATION NOTICE NO. 93-23: WESCHLER INSTRUMENTS MODEL 252SWITCHBOARD METERS

Addressees

All holders of operating licenses or construction permits for nuclear powerreactors. 7

Purpose

The U.S. Nuclear Regulatory Commission (NRC) is issuing this informationnotice to alert addressees to possible problems with Weschler Instruments(Weschler) Model 252 commercial grade switchboard meters. It is expected thatrecipients will review the information for applicability to their facilitiesand consider actions, as appropriate, to avoid similar problems. However,suggestions contained in this information notice are not NRC requirements;therefore, no specific action or written response is required.

Description of Circumstances

On November 9, 1992, Weschler informed the NRC of sticking meter movements insome Model 252 meters manufactured and supplied as commercial grade items.Although Weschler reported having no evidence that meters manufacturedspecifically for safety-related service are affected, Weschler was concernedthat affected commercial grade meters could have been dedicated for use innuclear safety-related applications.DiscussionWeschler determined that some of the commercial grade meters returned forrepair or calibration were inaccurate and erratic. The vendor engineeringreport attributed this problem to sticking of the meter movement because of anoff-center torsion spring. Weschler determined that this condition resultedfrom a deviation in the dimensions associated with the torsion head screwscombined with several coincidental factors that included (1) degradation ofclip-to-torsion screw lubrication, (2) low initial force from the spring-retaining clip or fatigue of the spring-retaining clip, (3) variations in thealignment of the meter movement during initial assembly, and (4) the effect ofthe summation of the dimensional tolerances in the assembly of thesubcomponents.9303240274 P P 5tC C* i\ 9I _X3C9c IN 93-23March 31, 1993 To prevent this deficiency in future products, Weschler revised its productioninspection procedures to specifically require checking the dimensions inquestion. Weschler also revised its nuclear quality assurance procedures to.require specific checks of torsion head screw dimensions, although the vendorhas not detected a problem with meters manufactured specifically for safety-related applications.Weschler could not determine whether or not any Model 252 switchboard meterssold as commercial grade items through the various distributors had beendedicated for use in nuclear safety-related applications. Therefore, Weschlerhas not directly notified any licensees about this problem.Weschler stated that the principal corrective action it has taken for affectedmeters returned for repair and recalibration is to replace the faulty torsionhead screws because they can't be repaired. Upon request, Weschler will givelicensees information about the problem and the recommended correctivemeasures.This information notice requires no specific action or written response. Ifyou have any questions about the information in this notice, please contactthe technical contact listed below or the appropriate Office of NuclearReactor Regulation (NRR) project manager.Brian K. Grimes, DirectorDivision of Operating Reactor SupportOffice of Nuclear Reactor RegulationTechnical contact: S. V. Athavale, NRR(301) 504-2974

Attachment:

List of Recently Issued NRC Information Notices K-IAttachmentIN 93-23March 31, 1993 LIST OF RECENTLY ISSUEDNRC INFORMATION NOTICESInformation Date ofNotice No. Subject Issuance Issued to93-2293-2193-2093-1993-18Tripping of Klockner-Moeller Molded-CaseCircuit Breakers due toSupport Level FailureSummary of NRC StaffObservations Compiledduring Engineering Auditsor Inspections of Licen-see Erosion/CorrosionProgramsThermal Fatigue Crackingof Feedwater Piping toSteam GeneratorsSlab Hopper BulgingPortable Moisture-DensityGauge User Responsibilitiesduring Field OperationsSafety Systems Responseto Loss of Coolant andLoss of Offsite PowerFailures of Nut-LockingDevices in Check ValvesFailure to Verify theContinuity of Shunt TripAttachment Contacts inManual Safety Injectionand Reactor Trip SwitchesClarification of10 CFR 40.22, SmallQuantities of SourceMaterial03/26/9303/25/9303/24/9303/17/9203/10/9303/08/9302/19/9302/18/9302/18/93All holders of OLs or CPsfor nuclear power reactors.All holders of OLs or CPsfor light water nuclearpower reactors.All holders of OLs or CPsfor PWRs supplied byWestinghouse or CombustionEngineering.All nuclear fuel cyclelicensees.All U.S. Nuclear RegulatoryCommission licensees thatpossess moisture-densitygauges.All holders of OLs or CPsfor nuclear power reactors.All holders of OLs or CPsfor nuclear power reactors.All holders of OLs or CPsfor nuclear power reactors.All licensees who possesssource material.93-1793-1693-1593-14OL = Operating LicenseCP -Construction Permit

~'-2 IN 93-23March 31, 1993 To prevent this deficiency in future products, Weschler revised its productioninspection procedures to specifically require checking the dimensions inquestion. Weschler also revised its nuclear quality assurance procedures torequire specific checks of torsion head screw dimensions, although the vendorhas not detected a problem with meters manufactured specifically for safety-related applications.Weschler could not determine whether or not any Model 252 switchboard meterssold as commercial grade items through the various distributors had beendedicated for use in nuclear safety-related applications. Therefore, Weschlerhas not directly notified any licensees about this problem.Weschler stated that the principal corrective action it has taken for affectedmeters returned for repair and recalibration is to replace the faulty torsionhead screws because they can't be repaired. Upon request, Weschler will givelicensees information about the problem and the recommended correctivemeasures.This information notice requires no specific action or written response. Ifyou have any questions about the information in this notice, please contactthe technical contact listed below or the appropriate Office of NuclearReactor Regulation (NRR) project manager.orig /s/'d by BKGrimesBrian K. Grimes, DirectorDivision of Operating Reactor SupportOffice of Nuclear Reactor RegulationTechnical contact: S. V. Athavale, NRR(301) 504-2974

Attachment:

% L *List of Receitly Issudd NRC Information NoticesDOCUMENT NAME: 93-2IN*D/DRIL:NRR *D/DRCH:NRR *C/OGCB: DORS:NRRCERossi BABoger GHMarcus3 03/11/93 02/11/93 03/15/93*OGCB:DORS:NRR*HICB:DRCH:NRR*SC/HICB:DRCH:NRR*C/HICB:DRCH:NRR*RPB:ADMAJKugler SVAthavale JMauck JWermiel TechEd02/08/93 02/08/93 02/10/93 02/10/93 02/08/93 IN 93-XXMarch XX, 1993 To prevent this deficiency in future products, Weschler revised its productioninspection procedures to specifically require checking the dimensions inquestion. Weschler also revised its nuclear quality assurance procedures torequire specific checks of torsion head screw dimensions, although the vendorhas not detected a problem with meters manufactured specifically for safety-related applications.Weschler could not determine whether or not any Model 252 switchboard meterssold as commercial grade items through the various distributors had beendedicated for use in nuclear safety-related applications. Therefore, Weschlerhas not directly notified any licensees about this problem.Weschler stated that the principal corrective action it has taken for affectedmeters returned to it for repair and recalibration is to replace the faultytorsion head screws because they can't be repaired. Upon request, Weschlerwill give licensees information about the problem and the recommendedcorrective measures.This information notice requires no specific action or written response. Ifyou have any questions about the information in this notice, please contactthe technical contact listed below or the appropriate Office of NuclearReactor Regulation (NRR) project manager.Brian K. Grimes, DirectorDivision of Operating Reactor SuppprtOffice of Nuclear Reactor RegulationTechnical contact: S. V. Athavale(301) 504-2974

Attachment:

List of Recently Issued NRC Information NoticesD/DORS:NRR *D/DRIL:NRR *D/DRCH:NRR C/OGCB:DORS:NRRBKGrimes CERossi BABoger GHMarcu03/ /93 03/11/93 02/11/93 / xi 9*OGCB:DORS:NRR*HICB:DRCH:NRR*SC/HICB:DRCH:NRR*C/HICB:DRCH:NRR*RPB:ADMAJKugler SVAthavale JMauck JWermiel TechEd02/08/93 02/08/93 02/10/93 02/10/93 02/08/93

-CK>~IN 93-XXMarch XX, 1993 To prevent this deficiency in future products, Weschler revised its productioninspection procedures to specifically require checking the dimensions inquestion. Weschler also revised its nuclear quality assurance procedures torequire specific checks of torsion head screw dimensions, although the vendorhas not detected a problem with meters manufactured specifically for safety-related applications.Weschler could not determine whether or not any Model 252 switchboard meterssold as commercial grade items through the various distributors had beendedicated for use in nuclear safety-related applications. Therefore, Weschlerhas not directly notified any licensees about this problem.Weschler stated that the principal corrective action it has taken for affectedmeters returned to it for repair and recalibration is to replace the faultytorsion head screws because they can't be repaired. Upon request, Weschlerwill give licensees information about the problem and the recommendedcorrective measures.This information notice requires no specific action or written response. Ifyou have any questions about the information in this notice, please contactthe technical contact listed below or the appropriate Office of NuclearReactor Regulation (NRR) project manager.Brian K. Grimes, DirectorDivision of Operating Reactor SupportOffice of Nuclear Reactor RegulationTechnical contact:S. V. Athavale(301) 504-2974

Attachment:

List of Recently Issued NRC Information NoticesD/DORS:NRR C' *D/DRCH:NRR C/OGCB:DORS:NRRBKGrimes BABoger GHMarcus03/ /93 03//l/93 02/11/93 02/ /93*OGCB:DORS:NRR*HICB:DRCH:NRR*SC/HICB:DRCH:NRR*C/HICB:DRCH:NRR*RPB:ADM MD:DRIL:NRR gttAJKugler SVAthavale JMauck JWermiel TechEd RZinmerman:ld02/08/93 02/08/93 02/10/93 02/10/93 02/08/93 03/S/93

'SK>IN 93-XXFebruary XX, 993To prevent this deficiency in future products, Weschler revised its productioninspection procedures to specifically require checking the dimensions inquestion. Weschler also revised its nuclear quality assurance procedures torequire specific checks of torsion head screw dimensions, although the vendorhas not detected a problem with meters manufactured specifically for safety-related applications.Weschler could not determine whether or not any Model 252 switchboard meterssold as commercial grade items through the various distributors had beendedicated for use in nuclear safety-related applications. Therefore, Weschlerhas not directly notified any licensees about this problem.Weschler stated that the principal corrective action it has taken for affectedmeters returned to it for repair and recalibration is to replace the faultytorsion head screws because they can not be repaired. Upon request, Weschlerwill give licensees information about the problem and the recommendedcorrective measures.This information notice requires no specific action or written response. Ifyou have any questions about the information in this notice, please contactthe technical contact listed below or the appropriate Office of NuclearReactor Regulation (NRR) project manager.Brian K. Grimes, DirectorDivision of Operating Reactor SupportOffice of Nuclear Reactor RegulationTechnical contact:S. V. Athavale(301) 504-2974

Attachment:

List of Recentl Issued NRC Information NoticesD/DORS:NRR /DRIL:NRR Di q C/OGCB:DORS:NRRBKGrimes CERossi er +'% GHMarcus02/ /93 02/ /93 U02/ 1/93 02/ /93*OGCB:DORS:NRR*HICB:DRCH:NRR*SC/HICB:DRCH:NRR*C/H B:DRCH:NRR*RPB:ADMAJKugler SVAthavale JMauck JWermiel TechEd02/08/93 02/08/93 02/10/93 02/10/93 02/08/93C 0 "V C__ .1~o 2 k2%~-m &_ C6Q a e P. .TVA

-IN 93-XX--February XX, 1993 To prevent this deficiency in future products, Weschler has revised itsproduction inspection procedures to specifically require checking thedimensions in question. In addition, Weschler has revised its nuclear qualityassurance procedures to require specific checks of torsion head screwdimensions, although the vendor has not detected a problem with metersmanufactured specifically for safety-related applications.Weschler could not determine whether or not any Model 252 switchboard meterssold as commercial grade items through the various distributors had beendedicated for use in nuclear safety-related applications. Therefore, Weschlerhas not directly notified any licensees about this problem.Weschler stated that the principal corrective action it has taken for affectedmeters returned to it for repair and recalibration is to replace the faultytorsion head screws because they can not be repaired. Weschler will provideinformation about the problem and the recommended corrective measures tolicensees upon request.This information notice requires no specific action or written response. Ifyou have any questions about the information in this notice, please contactthe technical contact listed below or the appropriate Office of NuclearReactor Regulation (NRR) project manager.Brian K. Grimes, DirectorDivision of Operating Reactor SupportOffice of Nuclear Reactor RegulationTechnical contact:S. V. Athavale(301) 504-2974

Attachment:

List of Recently Issued NRC Information NoticesOGCB:DORS:NRRAJKugler.it02/ S/9?3UD/DORS:NRRBKGrimes02/ /93HICB:DRCH: RRSVAthavale02/8 /93 a-.D/DRIL:NRRCERossi02/ /93&J .DRCH:NRR02/ /9<LifD/DRCH:NRRBABogerC/H RCH:NRRJWe lel02/10/93C/OGCB:DORS:NRRGHMarcus02/ /93RPB:ADMTechEd02/ /93 IN 93-XXFebruary XX, 1993 To prevent this deficiency in future products, Weschler has revised itsproduction inspection procedures to specifically require checking thedimensions in question. In addition, Weschler has revised its nuclear qualityassurance procedures to require specific checks of torsion head screwdimensions, although the vendor has not detected a problem with metersmanufactured specifically for safety-related applications.Weschler could not determine whether or not any Model 252 switchboard meterssold as commercial grade items through the various distributors had beendedicated for use in nuclear safety-related applications. Therefore, Weschlerhas not directly notified any licensees about this problem.Weschler stated that the principal corrective action it has taken for affectedmeters returned to it for repair and recalibration is to replace the faultytorsion head screws because they can not be repaired. Weschler will provideinformation about the problem and the recommended corrective measures tolicensees upon request.This information notice requires no specific action or written response. Ifyou have any questions about the information in this notice, please contactthe technical contact listed below or the appropriate Office of NuclearReactor Regulation (NRR) project manager.Brian K. Grimes, DirectorDivision of Operating Reactor SupportOffice of Nuclear Reactor RegulationTechnical contact: S. V. Athavale(301) 504-2974

Attachment:

List of Recently Issued NRC Information NoticesD/DORS:NRR D/DRIL:NRR D/DRCH:NRR C/OGCB:DORS:NRRBKGrimes CERossi BABoger GHMarcus02/ /93 02/ /93 02/ /93 02/ /93OGCB:DORS:NRR HICB:DRCH:NRR SC/HICB:DRCH:NRR C/HICB:DRCH:NRR RPB:ADMAJKugler SVAthavale JMauck JWermiel TechEd 1&'a;n ap02/ /93 02/ /93 02/ /93 02/ /93 02/1 /93 a