Information Notice 1993-23, Weschler Instruments Model 252 Switchboard Meters: Difference between revisions

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{{#Wiki_filter:UNITED STATES NUCLEAR REGULATORY
{{#Wiki_filter:UNITED STATES


COMMISSION
NUCLEAR REGULATORY COMMISSION


===OFFICE OF NUCLEAR REACTOR REGULATION===
OFFICE OF NUCLEAR REACTOR REGULATION
WASHINGTON, D.C. 20555 March 31, 1993 NRC INFORMATION


NOTICE NO. 93-23: WESCHLER INSTRUMENTS
WASHINGTON, D.C. 20555 March 31, 1993 NRC INFORMATION NOTICE NO. 93-23:   WESCHLER INSTRUMENTS MODEL 252 SWITCHBOARD METERS
 
MODEL 252 SWITCHBOARD
 
METERS


==Addressees==
==Addressees==
All holders of operating
All holders of operating licenses or construction permits for nuclear power
 
licenses or construction


permits for nuclear power reactors.
reactors.                                             7
 
7  


==Purpose==
==Purpose==
The U.S. Nuclear Regulatory
The U.S. Nuclear Regulatory Commission (NRC) is issuing this information
 
Commission (NRC) is issuing this information
 
notice to alert addressees
 
to possible problems with Weschler Instruments (Weschler)
Model 252 commercial
 
grade switchboard
 
meters. It is expected that recipients
 
will review the information
 
for applicability
 
to their facilities
 
and 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
notice to alert addressees to possible problems with Weschler Instruments


On November 9, 1992, Weschler informed the NRC of sticking meter movements
(Weschler) Model 252 commercial grade switchboard meters. It is expected that


in some Model 252 meters manufactured
recipients will review the information for applicability to their facilities


and supplied as commercial
and 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.


grade items.Although Weschler reported having no evidence that meters manufactured
==Description of Circumstances==
On November 9, 1992, Weschler informed the NRC of sticking meter movements in


specifically
some Model 252 meters manufactured and supplied as commercial grade items.


for safety-related
Although Weschler reported having no evidence that meters manufactured


service are affected, Weschler was concerned that affected commercial
specifically for safety-related service are affected, Weschler was concerned


grade meters could have been dedicated
that affected commercial grade meters could have been dedicated for use in


for use in nuclear safety-related
nuclear safety-related applications.
 
applications.


Discussion
Discussion


Weschler determined
Weschler determined that some of the commercial grade meters returned for
 
that some of the commercial
 
grade meters returned for repair or calibration
 
were inaccurate
 
and erratic. The vendor engineering
 
report attributed
 
this problem to sticking of the meter movement because of an off-center
 
torsion spring. Weschler determined
 
that this condition
 
resulted from a deviation
 
in the dimensions
 
associated
 
with the torsion head screws combined with several coincidental
 
factors that included (1) degradation
 
of clip-to-torsion
 
screw lubrication, (2) low initial force from the spring-retaining
 
clip or fatigue of the spring-retaining
 
clip, (3) variations
 
in the alignment
 
of the meter movement during initial assembly, and (4) the effect of the summation
 
of the dimensional
 
tolerances
 
in the assembly of the subcomponents.
 
9303240274 P P 5tC C* i\ 9I _X3 C9c
 
IN 93-23 March 31, 1993 To prevent this deficiency
 
in future products, Weschler revised its production
 
inspection
 
procedures


to specifically
repair or calibration were inaccurate and erratic. The vendor engineering


require checking the dimensions
report attributed this problem to sticking of the meter movement because of an


in question.
off-center torsion spring. Weschler determined that this condition resulted


Weschler also revised its nuclear quality assurance
from a deviation in the dimensions associated with the torsion head screws


procedures
combined with several coincidental factors that included (1) degradation of


to.require specific checks of torsion head screw dimensions, although the vendor has not detected a problem with meters manufactured
clip-to-torsion screw lubrication, (2) low initial force from the spring- retaining clip or fatigue of the spring-retaining clip, (3) variations in the


specifically
alignment of the meter movement during initial assembly, and (4) the effect of


for safety-related applications.
the summation of the dimensional tolerances in the assembly of the


Weschler could not determine
subcomponents.


whether or not any Model 252 switchboard
9303240274    P    P      5tC            C*  i\      9I    _X3 C9c


meters sold as commercial
IN 93-23 March 31, 1993 To prevent this deficiency in future products, Weschler revised its production


grade items through the various distributors
inspection procedures to specifically require checking the dimensions in


had been dedicated
question. Weschler also revised its nuclear quality assurance procedures to.


for use in nuclear safety-related
require specific checks of torsion head screw dimensions, although the vendor


applications.
has not detected a problem with meters manufactured specifically for safety- related applications.


Therefore, Weschler has not directly notified any licensees
Weschler could not determine whether or not any Model 252 switchboard meters


about this problem.Weschler stated that the principal
sold as commercial grade items through the various distributors had been


corrective
dedicated for use in nuclear safety-related applications. Therefore, Weschler


action it has taken for affected meters returned for repair and recalibration
has not directly notified any licensees about this problem.


is to replace the faulty torsion head screws because they can't be repaired.
Weschler stated that the principal corrective action it has taken for affected


Upon request, Weschler will give licensees
meters returned for repair and recalibration is to replace the faulty torsion


information
head screws because they can't be repaired. Upon request, Weschler will give


about the problem and the recommended
licensees information about the problem and the recommended corrective


corrective
measures.


measures.This information
This information notice requires no specific action or written response. If


notice requires no specific action or written response.
you have any questions about the information in this notice, please contact


If you have any questions
the technical contact listed below or the appropriate Office of Nuclear


about the information
Reactor Regulation (NRR) project manager.


in this notice, please contact the technical
Brian K. Grimes, Director


contact listed below or the appropriate
Division of Operating Reactor Support


Office of Nuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, Director Division of Operating
Office of Nuclear Reactor Regulation


===Reactor Support Office of Nuclear Reactor Regulation===
Technical contact:  S. V. Athavale, NRR
Technical


contact: S. V. Athavale, NRR (301) 504-2974 Attachment:
(301) 504-2974 Attachment:
List of Recently Issued NRC Information


Notices
===List of Recently Issued NRC Information Notices===


K-I Attachment
K-I


IN 93-23 March 31, 1993 LIST OF RECENTLY ISSUED NRC INFORMATION
Attachment


NOTICES Information
IN 93-23 March 31, 1993 LIST OF RECENTLY ISSUED


Date of Notice No. Subject Issuance Issued to 93-22 93-21 93-20 93-19 93-18 Tripping of Klockner-Moeller Molded-Case
NRC INFORMATION NOTICES


Circuit Breakers due to Support Level Failure Summary of NRC Staff Observations
Information                                    Date of


Compiled during Engineering
Notice No.              Subject                Issuance  Issued to


Audits or Inspections
93-22          Tripping of Klockner-          03/26/93  All holders of OLs or CPs


of Licen-see Erosion/Corrosion
Moeller Molded-Case                      for nuclear power reactors.


Programs Thermal Fatigue Cracking of Feedwater
Circuit Breakers due to


===Piping to Steam Generators===
Support Level Failure
Slab Hopper Bulging Portable Moisture-Density


===Gauge User Responsibilities===
93-21          Summary of NRC Staff          03/25/93  All holders of OLs or CPs
during Field Operations


Safety Systems Response to Loss of Coolant and Loss of Offsite Power Failures of Nut-Locking
Observations Compiled                    for light water nuclear


Devices in Check Valves Failure to Verify the Continuity
during Engineering Audits                power reactors.


of Shunt Trip Attachment
or Inspections of Licen- see Erosion/Corrosion


Contacts in Manual Safety Injection and Reactor Trip Switches Clarification
Programs


of 10 CFR 40.22, Small Quantities
93-20          Thermal Fatigue Cracking      03/24/93  All holders of OLs or CPs


of Source Material 03/26/93 03/25/93 03/24/93 03/17/92 03/10/93 03/08/93 02/19/93 02/18/93 02/18/93 All holders of OLs or CPs for nuclear power reactors.All holders of OLs or CPs for light water nuclear power reactors.All holders of OLs or CPs for PWRs supplied by Westinghouse
of Feedwater Piping to                    for PWRs supplied by


or Combustion
Steam Generators                          Westinghouse or Combustion


Engineering.
Engineering.


All nuclear fuel cycle licensees.
93-19          Slab Hopper Bulging            03/17/92  All nuclear fuel cycle
 
===All U.S. Nuclear Regulatory===
Commission
 
licensees
 
that possess moisture-density
 
gauges.All holders of OLs or CPs for nuclear power reactors.All holders of OLs or CPs for nuclear power reactors.All holders of OLs or CPs for nuclear power reactors.All licensees
 
who possess source material.93-17 93-16 93-15 93-14 OL = Operating
 
License CP -Construction
 
Permit
 
~'-2 IN 93-23 March 31, 1993 To prevent this deficiency
 
in future products, Weschler revised its production
 
inspection
 
procedures
 
to specifically
 
require checking the dimensions
 
in question.
 
Weschler also revised its nuclear quality assurance
 
procedures
 
to require specific checks of torsion head screw dimensions, although the vendor has not detected a problem with meters manufactured
 
specifically
 
for safety-related applications.
 
Weschler could not determine
 
whether or not any Model 252 switchboard
 
meters sold as commercial
 
grade items through the various distributors
 
had been dedicated
 
for use in nuclear safety-related
 
applications.
 
Therefore, Weschler has not directly notified any licensees
 
about this problem.Weschler stated that the principal
 
corrective
 
action it has taken for affected meters returned for repair and recalibration
 
is to replace the faulty torsion head screws because they can't be repaired.
 
Upon request, Weschler will give licensees
 
information
 
about the problem and the recommended
 
corrective
 
measures.This information
 
notice requires no specific action or written response.
 
If you have any questions
 
about the information
 
in this notice, please contact the technical
 
contact listed below or the appropriate
 
Office of Nuclear Reactor Regulation (NRR) project manager.orig /s/'d by BKGrimes Brian K. Grimes, Director Division of Operating
 
===Reactor Support Office of Nuclear Reactor Regulation===
Technical
 
contact: S. V. Athavale, NRR (301) 504-2974 Attachment:
% L *List of Receitly Issudd NRC Information
 
Notices DOCUMENT NAME: 93-2IN*D/DRIL:NRR
 
*D/DRCH:NRR
 
*C/OGCB: DORS:NRR CERossi BABoger GHMarcus 3 03/11/93 02/11/93 03/15/93*OGCB:DORS:NRR*HICB:DRCH:NRR*SC/HICB:DRCH:NRR*C/HICB:DRCH:NRR*RPB:ADM
 
AJKugler SVAthavale
 
JMauck JWermiel TechEd 02/08/93 02/08/93 02/10/93 02/10/93 02/08/93 IN 93-XX March XX, 1993 To prevent this deficiency
 
in future products, Weschler revised its production
 
inspection
 
procedures
 
to specifically
 
require checking the dimensions
 
in question.
 
Weschler also revised its nuclear quality assurance
 
procedures
 
to require specific checks of torsion head screw dimensions, although the vendor has not detected a problem with meters manufactured
 
specifically
 
for safety-related applications.
 
Weschler could not determine
 
whether or not any Model 252 switchboard
 
meters sold as commercial
 
grade items through the various distributors
 
had been dedicated
 
for use in nuclear safety-related


applications.
licensees.


Therefore, Weschler has not directly notified any licensees
93-18          Portable Moisture-Density      03/10/93  All U.S. Nuclear Regulatory


about this problem.Weschler stated that the principal
Gauge User Responsibilities              Commission licensees that


corrective
during Field Operations                  possess moisture-density


action it has taken for affected meters returned to it for repair and recalibration
gauges.


is to replace the faulty torsion head screws because they can't be repaired.
93-17          Safety Systems Response        03/08/93  All holders of OLs or CPs


Upon request, Weschler will give licensees
to Loss of Coolant and                    for nuclear power reactors.


information
Loss of Offsite Power


about the problem and the recommended
93-16          Failures of Nut-Locking        02/19/93  All holders of OLs or CPs


corrective
Devices in Check Valves                  for nuclear power reactors.


measures.This information
93-15          Failure to Verify the          02/18/93  All holders of OLs or CPs


notice requires no specific action or written response.
Continuity of Shunt Trip                  for nuclear power reactors.


If you have any questions
Attachment Contacts in


about the information
Manual Safety Injection


in this notice, please contact the technical
and Reactor Trip Switches


contact listed below or the appropriate
93-14          Clarification of              02/18/93  All licensees who possess


Office of Nuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, Director Division of Operating
10 CFR 40.22, Small                      source material.


===Reactor Suppprt Office of Nuclear Reactor Regulation===
Quantities of Source
Technical


contact: S. V. Athavale (301) 504-2974 Attachment:
Material
List of Recently Issued NRC Information


Notices D/DORS:NRR
OL =  Operating License


*D/DRIL:NRR
CP -  Construction Permit


*D/DRCH:NRR
~'-2 IN 93-23 March 31, 1993 To prevent this deficiency in future products, Weschler revised its production


C/OGCB:DORS:NRR
inspection procedures to specifically require checking the dimensions in


BKGrimes CERossi BABoger GHMarcu 03/ /93 03/11/93 02/11/93 / xi 9*OGCB:DORS:NRR*HICB:DRCH:NRR*SC/HICB:DRCH:NRR*C/HICB:DRCH:NRR*RPB:ADM
question. Weschler also revised its nuclear quality assurance procedures to


AJKugler SVAthavale
require specific checks of torsion head screw dimensions, although the vendor


JMauck JWermiel TechEd 02/08/93 02/08/93 02/10/93 02/10/93 02/08/93
has not detected a problem with meters manufactured specifically for safety- related applications.
-C K>~IN 93-XX March XX, 1993 To prevent this deficiency


in future products, Weschler revised its production
Weschler could not determine whether or not any Model 252 switchboard meters


inspection
sold as commercial grade items through the various distributors had been


procedures
dedicated for use in nuclear safety-related applications. Therefore, Weschler


to specifically
has not directly notified any licensees about this problem.


require checking the dimensions
Weschler stated that the principal corrective action it has taken for affected


in question.
meters returned for repair and recalibration is to replace the faulty torsion


Weschler also revised its nuclear quality assurance
head screws because they can't be repaired. Upon request, Weschler will give


procedures
licensees information about the problem and the recommended corrective


to require specific checks of torsion head screw dimensions, although the vendor has not detected a problem with meters manufactured
measures.


specifically
This information notice requires no specific action or written response. If


for safety-related applications.
you have any questions about the information in this notice, please contact


Weschler could not determine
the technical contact listed below or the appropriate Office of Nuclear


whether or not any Model 252 switchboard
Reactor Regulation (NRR) project manager.


meters sold as commercial
orig /s/'d by BKGrimes


grade items through the various distributors
Brian K. Grimes, Director


had been dedicated
Division of Operating Reactor Support


for use in nuclear safety-related
Office of Nuclear Reactor Regulation


applications.
Technical contact:  S. V. Athavale, NRR


Therefore, Weschler has not directly notified any licensees
(301) 504-2974 Attachment:  %  L  *
List of Receitly Issudd NRC Information Notices


about this problem.Weschler stated that the principal
DOCUMENT NAME:  93-2IN


corrective
*D/DRIL:NRR      *D/DRCH:NRR      *C/OGCB: DORS:NRR


action it has taken for affected meters returned to it for repair and recalibration
CERossi          BABoger          GHMarcus


is to replace the faulty torsion head screws because they can't be repaired.
3      03/11/93          02/11/93        03/15/93
*OGCB:DORS:NRR*HICB:DRCH:NRR*SC/HICB:DRCH:NRR*C/HICB:DRCH:NRR*RPB:ADM


Upon request, Weschler will give licensees
AJKugler      SVAthavale    JMauck            JWermiel        TechEd


information
02/08/93      02/08/93      02/10/93          02/10/93        02/08/93


about the problem and the recommended
IN 93-XX


corrective
March XX, 1993 To prevent this deficiency in future products, Weschler revised its production


measures.This information
inspection procedures to specifically require checking the dimensions in


notice requires no specific action or written response.
question. Weschler also revised its nuclear quality assurance procedures to


If you have any questions
require specific checks of torsion head screw dimensions, although the vendor


about the information
has not detected a problem with meters manufactured specifically for safety- related applications.


in this notice, please contact the technical
Weschler could not determine whether or not any Model 252 switchboard meters


contact listed below or the appropriate
sold as commercial grade items through the various distributors had been


Office of Nuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, Director Division of Operating
dedicated for use in nuclear safety-related applications. Therefore, Weschler


===Reactor Support Office of Nuclear Reactor Regulation===
has not directly notified any licensees about this problem.
Technical


contact: S. V. Athavale (301) 504-2974 Attachment:
Weschler stated that the principal corrective action it has taken for affected
List of Recently Issued NRC Information


Notices D/DORS:NRR
meters returned to it for repair and recalibration is to replace the faulty


C' *D/DRCH:NRR
torsion head screws because they can't be repaired. Upon request, Weschler


C/OGCB:DORS:NRR
will give licensees information about the problem and the recommended


BKGrimes BABoger GHMarcus 03/ /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
corrective measures.


MD:DRIL:NRR
This information notice requires no specific action or written response. If


gtt AJKugler SVAthavale
you have any questions about the information in this notice, please contact


JMauck JWermiel TechEd RZinmerman:ld
the technical contact listed below or the appropriate Office of Nuclear


02/08/93 02/08/93 02/10/93 02/10/93 02/08/93 03/S/93
Reactor Regulation (NRR) project manager.
'S K>IN 93-XX February XX, 1993 To prevent this deficiency


in future products, Weschler revised its production
Brian K. Grimes, Director


inspection
Division of Operating Reactor Suppprt


procedures
Office of Nuclear Reactor Regulation


to specifically
Technical contact:  S. V. Athavale


require checking the dimensions
(301) 504-2974 Attachment:  List of Recently Issued NRC Information Notices


in question.
D/DORS:NRR    *D/DRIL:NRR      *D/DRCH:NRR      C/OGCB:DORS:NRR


Weschler also revised its nuclear quality assurance
BKGrimes      CERossi          BABoger          GHMarcu


procedures
03/  /93      03/11/93          02/11/93          / xi 9
*OGCB:DORS:NRR*HICB:DRCH:NRR*SC/HICB:DRCH:NRR*C/HICB:DRCH:NRR*RPB:ADM


to require specific checks of torsion head screw dimensions, although the vendor has not detected a problem with meters manufactured
AJKugler      SVAthavale    JMauck            JWermiel        TechEd


specifically
02/08/93      02/08/93      02/10/93          02/10/93        02/08/93


for safety-related applications.
-C


Weschler could not determine
K>~                              1 IN 93-XX


whether or not any Model 252 switchboard
March XX, 1993 To prevent this deficiency in future products, Weschler revised its production


meters sold as commercial
inspection procedures to specifically require checking the dimensions in


grade items through the various distributors
question. Weschler also revised its nuclear quality assurance procedures to


had been dedicated
require specific checks of torsion head screw dimensions, although the vendor


for use in nuclear safety-related
has not detected a problem with meters manufactured specifically for safety- related applications.


applications.
Weschler could not determine whether or not any Model 252 switchboard meters


Therefore, Weschler has not directly notified any licensees
sold as commercial grade items through the various distributors had been


about this problem.Weschler stated that the principal
dedicated for use in nuclear safety-related applications. Therefore, Weschler


corrective
has not directly notified any licensees about this problem.


action it has taken for affected meters returned to it for repair and recalibration
Weschler stated that the principal corrective action it has taken for affected


is to replace the faulty torsion head screws because they can not be repaired.
meters returned to it for repair and recalibration is to replace the faulty


Upon request, Weschler will give licensees
torsion head screws because they can't be repaired. Upon request, Weschler


information
will give licensees information about the problem and the recommended


about the problem and the recommended
corrective measures.


corrective
This information notice requires no specific action or written response. If


measures.This information
you have any questions about the information in this notice, please contact


notice requires no specific action or written response.
the technical contact listed below or the appropriate Office of Nuclear


If you have any questions
Reactor Regulation (NRR) project manager.


about the information
Brian K. Grimes, Director


in this notice, please contact the technical
Division of Operating Reactor Support


contact listed below or the appropriate
Office of Nuclear Reactor Regulation


Office of Nuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, Director Division of Operating
Technical contact:  S. V. Athavale


===Reactor Support Office of Nuclear Reactor Regulation===
(301) 504-2974 Attachment:  List of Recently Issued NRC Information Notices
Technical


contact: S. V. Athavale (301) 504-2974 Attachment:  
D/DORS:NRR                C' *D/DRCH:NRR        C/OGCB:DORS:NRR
List of Recentl Issued NRC Information


Notices D/DORS:NRR
BKGrimes                        BABoger          GHMarcus


/DRIL:NRR
03/ /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 gtt


Di q C/OGCB:DORS:NRR
AJKugler      SVAthavale    JMauck            JWermiel        TechEd  RZinmerman:ld


BKGrimes CERossi er +'% GHMarcus 02/ /93 02/ /93 U02/ 1/93 02/ /93*OGCB:DORS:NRR*HICB:DRCH:NRR*SC/HICB:DRCH:NRR*C/H
02/08/93     02/08/93     02/10/93          02/10/93         02/08/93 03/S/93


B:DRCH:NRR*RPB:ADM
'S


AJKugler SVAthavale
K>
                                                                  IN 93-XX


JMauck JWermiel TechEd 02/08/93 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
February XX, 1993 To prevent this deficiency in future products, Weschler revised its production


-IN 93-XX--February
inspection procedures to specifically require checking the dimensions in


XX, 1993 To prevent this deficiency
question. Weschler also revised its nuclear quality assurance procedures to


in future products, Weschler has revised its production
require specific checks of torsion head screw dimensions, although the vendor


inspection
has not detected a problem with meters manufactured specifically for safety- related applications.


procedures
Weschler could not determine whether or not any Model 252 switchboard meters


to specifically
sold as commercial grade items through the various distributors had been


require checking the dimensions
dedicated for use in nuclear safety-related applications. Therefore, Weschler


in question.
has not directly notified any licensees about this problem.


In addition, Weschler has revised its nuclear quality assurance
Weschler stated that the principal corrective action it has taken for affected


procedures
meters returned to it for repair and recalibration is to replace the faulty


to require specific checks of torsion head screw dimensions, although the vendor has not detected a problem with meters manufactured
torsion head screws because they can not be repaired. Upon request, Weschler


specifically
will give licensees information about the problem and the recommended


for safety-related
corrective measures.


applications.
This information notice requires no specific action or written response. If


Weschler could not determine
you have any questions about the information in this notice, please contact


whether or not any Model 252 switchboard
the technical contact listed below or the appropriate Office of Nuclear


meters sold as commercial
Reactor Regulation (NRR) project manager.


grade items through the various distributors
Brian K. Grimes, Director


had been dedicated
Division of Operating Reactor Support


for use in nuclear safety-related
Office of Nuclear Reactor Regulation


applications.
Technical contact:  S. V. Athavale


Therefore, Weschler has not directly notified any licensees
(301) 504-2974 Attachment:  List of Recentl  Issued NRC Information Notices


about this problem.Weschler stated that the principal
D/DORS:NRR      /DRIL:NRR        Di        q    C/OGCB:DORS:NRR


corrective
BKGrimes      CERossi                er +'%    GHMarcus


action it has taken for affected meters returned to it for repair and recalibration
02/ /93        02/ /93          U02/ 1/93        02/ /93
  *OGCB:DORS:NRR*HICB:DRCH:NRR*SC/HICB:DRCH:NRR*C/H B:DRCH:NRR*RPB:ADM


is to replace the faulty torsion head screws because they can not be repaired.
AJKugler      SVAthavale    JMauck            JWermiel        TechEd


Weschler will provide information
02/08/93      02/08/93      02/10/93          02/10/93        02/08/93 a&_ e P.. TVA


about the problem and the recommended
il C 0 "V C__ .1 ~o2 k2%~-m


corrective
C6Q


measures to licensees
-
                                                                    IN 93-XX


upon request.This information
-      -February                          XX, 1993 To prevent this deficiency in future products, Weschler has revised its


notice requires no specific action or written response.
production inspection procedures to specifically require checking the


If you have any questions
dimensions in question. In addition, Weschler has revised its nuclear quality


about the information
assurance procedures to require specific checks of torsion head screw


in this notice, please contact the technical
dimensions, although the vendor has not detected a problem with meters


contact listed below or the appropriate
manufactured specifically for safety-related applications.


Office of Nuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, Director Division of Operating
Weschler could not determine whether or not any Model 252 switchboard meters


===Reactor Support Office of Nuclear Reactor Regulation===
sold as commercial grade items through the various distributors had been
Technical


contact: S. V. Athavale (301) 504-2974 Attachment:
dedicated for use in nuclear safety-related applications. Therefore, Weschler
List of Recently Issued NRC Information


Notices OGCB:DORS:NRR
has not directly notified any licensees about this problem.


AJKugler.it
Weschler stated that the principal corrective action it has taken for affected


02/ S/9?3U D/DORS:NRR
meters returned to it for repair and recalibration is to replace the faulty


BKGrimes 02/ /93 HICB:DRCH:
torsion head screws because they can not be repaired. Weschler will provide


===RR SVAthavale===
information about the problem and the recommended corrective measures to
02/8 /93 a-.D/DRIL:NRR


CERossi 02/ /93&J .DRCH:NRR 02/ /9<Lif D/DRCH:NRR
licensees upon request.


BABoger C/H RCH:NRR JWe lel 02/10/93 C/OGCB:DORS:NRR
This information notice requires no specific action or written response. If


GHMarcus 02/ /93 RPB:ADM TechEd 02/ /93 IN 93-XX February XX, 1993 To prevent this deficiency
you have any questions about the information in this notice, please contact


in future products, Weschler has revised its production
the technical contact listed below or the appropriate Office of Nuclear


inspection
Reactor Regulation (NRR) project manager.


procedures
Brian K. Grimes, Director


to specifically
Division of Operating Reactor Support


require checking the dimensions
Office of Nuclear Reactor Regulation


in question.
Technical contact:  S. V. Athavale


In addition, Weschler has revised its nuclear quality assurance
(301) 504-2974 Attachment:  List of Recently Issued NRC Information Notices


procedures
D/DORS:NRR    D/DRIL:NRR          D/DRCH:NRR        C/OGCB:DORS:NRR


to require specific checks of torsion head screw dimensions, although the vendor has not detected a problem with meters manufactured
BKGrimes      CERossi            BABoger          GHMarcus


specifically
02/ /93      02/ /93                              02/ /93 OGCB:DORS:NRR HICB:DRCH: RR  &J    .DRCH:NRR C/H        RCH:NRR  RPB:ADM


for safety-related
AJKugler.it  SVAthavale                        JWe lel          TechEd


applications.
02/ S/9?3U    02/8 /93 a-. 02/ /9<            02/10/93          02/ /93 Lif


Weschler could not determine
IN 93-XX


whether or not any Model 252 switchboard
February XX, 1993 To prevent this deficiency in future products, Weschler has revised its


meters sold as commercial
production inspection procedures to specifically require checking the


grade items through the various distributors
dimensions in question. In addition, Weschler has revised its nuclear quality


had been dedicated
assurance procedures to require specific checks of torsion head screw


for use in nuclear safety-related
dimensions, although the vendor has not detected a problem with meters


applications.
manufactured specifically for safety-related applications.


Therefore, Weschler has not directly notified any licensees
Weschler could not determine whether or not any Model 252 switchboard meters


about this problem.Weschler stated that the principal
sold as commercial grade items through the various distributors had been


corrective
dedicated for use in nuclear safety-related applications. Therefore, Weschler


action it has taken for affected meters returned to it for repair and recalibration
has not directly notified any licensees about this problem.


is to replace the faulty torsion head screws because they can not be repaired.
Weschler stated that the principal corrective action it has taken for affected


Weschler will provide information
meters returned to it for repair and recalibration is to replace the faulty


about the problem and the recommended
torsion head screws because they can not be repaired. Weschler will provide


corrective
information about the problem and the recommended corrective measures to


measures to licensees
licensees upon request.


upon request.This information
This information notice requires no specific action or written response. If


notice requires no specific action or written response.
you have any questions about the information in this notice, please contact


If you have any questions
the technical contact listed below or the appropriate Office of Nuclear


about the information
Reactor Regulation (NRR) project manager.


in this notice, please contact the technical
Brian K. Grimes, Director


contact listed below or the appropriate
Division of Operating Reactor Support


Office of Nuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, Director Division of Operating
Office of Nuclear Reactor Regulation


===Reactor Support Office of Nuclear Reactor Regulation===
Technical contact:  S. V. Athavale
Technical


contact: S. V. Athavale (301) 504-2974 Attachment:  
(301) 504-2974 Attachment:   List of Recently Issued NRC Information Notices
List of Recently Issued NRC Information


Notices D/DORS:NRR
D/DORS:NRR    D/DRIL:NRR        D/DRCH:NRR      C/OGCB:DORS:NRR


D/DRIL:NRR
BKGrimes      CERossi          BABoger          GHMarcus


D/DRCH:NRR
02/ /93      02/ /93          02/ /93          02/ /93 OGCB:DORS:NRR HICB:DRCH:NRR  SC/HICB:DRCH:NRR C/HICB:DRCH:NRR  RPB:ADM


C/OGCB:DORS:NRR
AJKugler


BKGrimes CERossi BABoger GHMarcus 02/ /93 02/ /93 02/ /93 02/ /93 OGCB:DORS:NRR
02/ /93 SVAthavale


HICB:DRCH:NRR
02/ /93 JMauck


SC/HICB:DRCH:NRR
02/ /93 JWermiel


C/HICB:DRCH:NRR
02/ /93 TechEd 1&'a;n


RPB:ADM AJKugler SVAthavale
02/1 /93 ap


JMauck JWermiel TechEd 1&'a;n ap 02/ /93 02/ /93 02/ /93 02/ /93 02/1 /93 a}}
a}}


{{Information notice-Nav}}
{{Information notice-Nav}}

Latest revision as of 04:20, 24 November 2019

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  Entergy icon.png
Issue date: 03/31/1993
From: Grimes B
Office of Nuclear Reactor Regulation
To:
References
IN-93-023, NUDOCS 9303240274
Download: ML031080024 (23)
v • d • e


UNITED STATES

NUCLEAR REGULATORY COMMISSION

OFFICE OF NUCLEAR REACTOR REGULATION

WASHINGTON, D.C. 20555 March 31, 1993 NRC INFORMATION NOTICE NO. 93-23: WESCHLER INSTRUMENTS MODEL 252 SWITCHBOARD METERS

Addressees

All holders of operating licenses or construction permits for nuclear power

reactors. 7

Purpose

The U.S. Nuclear Regulatory Commission (NRC) is issuing this information

notice to alert addressees to possible problems with Weschler Instruments

(Weschler) Model 252 commercial grade switchboard meters. It is expected that

recipients will review the information for applicability to their facilities

and 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 in

some Model 252 meters manufactured and supplied as commercial grade items.

Although Weschler reported having no evidence that meters manufactured

specifically for safety-related service are affected, Weschler was concerned

that affected commercial grade meters could have been dedicated for use in

nuclear safety-related applications.

Discussion

Weschler determined that some of the commercial grade meters returned for

repair or calibration were inaccurate and erratic. The vendor engineering

report attributed this problem to sticking of the meter movement because of an

off-center torsion spring. Weschler determined that this condition resulted

from a deviation in the dimensions associated with the torsion head screws

combined with several coincidental factors that included (1) degradation of

clip-to-torsion screw lubrication, (2) low initial force from the spring- retaining clip or fatigue of the spring-retaining clip, (3) variations in the

alignment of the meter movement during initial assembly, and (4) the effect of

the summation of the dimensional tolerances in the assembly of the

subcomponents.

9303240274 P P 5tC C* i\ 9I _X3 C9c

IN 93-23 March 31, 1993 To prevent this deficiency in future products, Weschler revised its production

inspection procedures to specifically require checking the dimensions in

question. Weschler also revised its nuclear quality assurance procedures to.

require specific checks of torsion head screw dimensions, although the vendor

has not detected a problem with meters manufactured specifically for safety- related applications.

Weschler could not determine whether or not any Model 252 switchboard meters

sold as commercial grade items through the various distributors had been

dedicated for use in nuclear safety-related applications. Therefore, Weschler

has not directly notified any licensees about this problem.

Weschler stated that the principal corrective action it has taken for affected

meters returned for repair and recalibration is to replace the faulty torsion

head screws because they can't be repaired. Upon request, Weschler will give

licensees information about the problem and the recommended corrective

measures.

This information notice requires no specific action or written response. If

you have any questions about the information in this notice, please contact

the technical contact listed below or the appropriate Office of Nuclear

Reactor Regulation (NRR) project manager.

Brian K. Grimes, Director

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical contact: S. V. Athavale, NRR

(301) 504-2974 Attachment:

List of Recently Issued NRC Information Notices

K-I

Attachment

IN 93-23 March 31, 1993 LIST OF RECENTLY ISSUED

NRC INFORMATION NOTICES

Information Date of

Notice No. Subject Issuance Issued to

93-22 Tripping of Klockner- 03/26/93 All holders of OLs or CPs

Moeller Molded-Case for nuclear power reactors.

Circuit Breakers due to

Support Level Failure

93-21 Summary of NRC Staff 03/25/93 All holders of OLs or CPs

Observations Compiled for light water nuclear

during Engineering Audits power reactors.

or Inspections of Licen- see Erosion/Corrosion

Programs

93-20 Thermal Fatigue Cracking 03/24/93 All holders of OLs or CPs

of Feedwater Piping to for PWRs supplied by

Steam Generators Westinghouse or Combustion

Engineering.

93-19 Slab Hopper Bulging 03/17/92 All nuclear fuel cycle

licensees.

93-18 Portable Moisture-Density 03/10/93 All U.S. Nuclear Regulatory

Gauge User Responsibilities Commission licensees that

during Field Operations possess moisture-density

gauges.

93-17 Safety Systems Response 03/08/93 All holders of OLs or CPs

to Loss of Coolant and for nuclear power reactors.

Loss of Offsite Power

93-16 Failures of Nut-Locking 02/19/93 All holders of OLs or CPs

Devices in Check Valves for nuclear power reactors.

93-15 Failure to Verify the 02/18/93 All holders of OLs or CPs

Continuity of Shunt Trip for nuclear power reactors.

Attachment Contacts in

Manual Safety Injection

and Reactor Trip Switches

93-14 Clarification of 02/18/93 All licensees who possess

10 CFR 40.22, Small source material.

Quantities of Source

Material

OL = Operating License

CP - Construction Permit

~'-2 IN 93-23 March 31, 1993 To prevent this deficiency in future products, Weschler revised its production

inspection procedures to specifically require checking the dimensions in

question. Weschler also revised its nuclear quality assurance procedures to

require specific checks of torsion head screw dimensions, although the vendor

has not detected a problem with meters manufactured specifically for safety- related applications.

Weschler could not determine whether or not any Model 252 switchboard meters

sold as commercial grade items through the various distributors had been

dedicated for use in nuclear safety-related applications. Therefore, Weschler

has not directly notified any licensees about this problem.

Weschler stated that the principal corrective action it has taken for affected

meters returned for repair and recalibration is to replace the faulty torsion

head screws because they can't be repaired. Upon request, Weschler will give

licensees information about the problem and the recommended corrective

measures.

This information notice requires no specific action or written response. If

you have any questions about the information in this notice, please contact

the technical contact listed below or the appropriate Office of Nuclear

Reactor Regulation (NRR) project manager.

orig /s/'d by BKGrimes

Brian K. Grimes, Director

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical contact: S. V. Athavale, NRR

(301) 504-2974 Attachment:  % L *

List of Receitly Issudd NRC Information Notices

DOCUMENT NAME: 93-2IN

  • D/DRIL:NRR *D/DRCH:NRR *C/OGCB: DORS:NRR

CERossi BABoger GHMarcus

3 03/11/93 02/11/93 03/15/93

  • OGCB:DORS:NRR*HICB:DRCH:NRR*SC/HICB:DRCH:NRR*C/HICB:DRCH:NRR*RPB:ADM

AJKugler SVAthavale JMauck JWermiel TechEd

02/08/93 02/08/93 02/10/93 02/10/93 02/08/93

IN 93-XX

March XX, 1993 To prevent this deficiency in future products, Weschler revised its production

inspection procedures to specifically require checking the dimensions in

question. Weschler also revised its nuclear quality assurance procedures to

require specific checks of torsion head screw dimensions, although the vendor

has not detected a problem with meters manufactured specifically for safety- related applications.

Weschler could not determine whether or not any Model 252 switchboard meters

sold as commercial grade items through the various distributors had been

dedicated for use in nuclear safety-related applications. Therefore, Weschler

has not directly notified any licensees about this problem.

Weschler stated that the principal corrective action it has taken for affected

meters returned to it for repair and recalibration is to replace the faulty

torsion head screws because they can't be repaired. Upon request, Weschler

will give licensees information about the problem and the recommended

corrective measures.

This information notice requires no specific action or written response. If

you have any questions about the information in this notice, please contact

the technical contact listed below or the appropriate Office of Nuclear

Reactor Regulation (NRR) project manager.

Brian K. Grimes, Director

Division of Operating Reactor Suppprt

Office of Nuclear Reactor Regulation

Technical contact: S. V. Athavale

(301) 504-2974 Attachment: List of Recently Issued NRC Information Notices

D/DORS:NRR *D/DRIL:NRR *D/DRCH:NRR C/OGCB:DORS:NRR

BKGrimes CERossi BABoger GHMarcu

03/ /93 03/11/93 02/11/93 / xi 9

  • OGCB:DORS:NRR*HICB:DRCH:NRR*SC/HICB:DRCH:NRR*C/HICB:DRCH:NRR*RPB:ADM

AJKugler SVAthavale JMauck JWermiel TechEd

02/08/93 02/08/93 02/10/93 02/10/93 02/08/93

-C

K>~ 1 IN 93-XX

March XX, 1993 To prevent this deficiency in future products, Weschler revised its production

inspection procedures to specifically require checking the dimensions in

question. Weschler also revised its nuclear quality assurance procedures to

require specific checks of torsion head screw dimensions, although the vendor

has not detected a problem with meters manufactured specifically for safety- related applications.

Weschler could not determine whether or not any Model 252 switchboard meters

sold as commercial grade items through the various distributors had been

dedicated for use in nuclear safety-related applications. Therefore, Weschler

has not directly notified any licensees about this problem.

Weschler stated that the principal corrective action it has taken for affected

meters returned to it for repair and recalibration is to replace the faulty

torsion head screws because they can't be repaired. Upon request, Weschler

will give licensees information about the problem and the recommended

corrective measures.

This information notice requires no specific action or written response. If

you have any questions about the information in this notice, please contact

the technical contact listed below or the appropriate Office of Nuclear

Reactor Regulation (NRR) project manager.

Brian K. Grimes, Director

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical contact: S. V. Athavale

(301) 504-2974 Attachment: List of Recently Issued NRC Information Notices

D/DORS:NRR C' *D/DRCH:NRR C/OGCB:DORS:NRR

BKGrimes BABoger GHMarcus

03/ /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 gtt

AJKugler SVAthavale JMauck JWermiel TechEd RZinmerman:ld

02/08/93 02/08/93 02/10/93 02/10/93 02/08/93 03/S/93

'S

K>

IN 93-XX

February XX, 1993 To prevent this deficiency in future products, Weschler revised its production

inspection procedures to specifically require checking the dimensions in

question. Weschler also revised its nuclear quality assurance procedures to

require specific checks of torsion head screw dimensions, although the vendor

has not detected a problem with meters manufactured specifically for safety- related applications.

Weschler could not determine whether or not any Model 252 switchboard meters

sold as commercial grade items through the various distributors had been

dedicated for use in nuclear safety-related applications. Therefore, Weschler

has not directly notified any licensees about this problem.

Weschler stated that the principal corrective action it has taken for affected

meters returned to it for repair and recalibration is to replace the faulty

torsion head screws because they can not be repaired. Upon request, Weschler

will give licensees information about the problem and the recommended

corrective measures.

This information notice requires no specific action or written response. If

you have any questions about the information in this notice, please contact

the technical contact listed below or the appropriate Office of Nuclear

Reactor Regulation (NRR) project manager.

Brian K. Grimes, Director

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical contact: S. V. Athavale

(301) 504-2974 Attachment: List of Recentl Issued NRC Information Notices

D/DORS:NRR /DRIL:NRR Di q C/OGCB:DORS:NRR

BKGrimes CERossi er +'% GHMarcus

02/ /93 02/ /93 U02/ 1/93 02/ /93

  • OGCB:DORS:NRR*HICB:DRCH:NRR*SC/HICB:DRCH:NRR*C/H B:DRCH:NRR*RPB:ADM

AJKugler SVAthavale JMauck JWermiel TechEd

02/08/93 02/08/93 02/10/93 02/10/93 02/08/93 a&_ e P.. TVA

il C 0 "V C__ .1 ~o2 k2%~-m

C6Q

-

IN 93-XX

- -February XX, 1993 To prevent this deficiency in future products, Weschler has revised its

production inspection procedures to specifically require checking the

dimensions in question. In addition, Weschler has revised its nuclear quality

assurance procedures to require specific checks of torsion head screw

dimensions, although the vendor has not detected a problem with meters

manufactured specifically for safety-related applications.

Weschler could not determine whether or not any Model 252 switchboard meters

sold as commercial grade items through the various distributors had been

dedicated for use in nuclear safety-related applications. Therefore, Weschler

has not directly notified any licensees about this problem.

Weschler stated that the principal corrective action it has taken for affected

meters returned to it for repair and recalibration is to replace the faulty

torsion head screws because they can not be repaired. Weschler will provide

information about the problem and the recommended corrective measures to

licensees upon request.

This information notice requires no specific action or written response. If

you have any questions about the information in this notice, please contact

the technical contact listed below or the appropriate Office of Nuclear

Reactor Regulation (NRR) project manager.

Brian K. Grimes, Director

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical contact: S. V. Athavale

(301) 504-2974 Attachment: List of Recently Issued NRC Information Notices

D/DORS:NRR D/DRIL:NRR D/DRCH:NRR C/OGCB:DORS:NRR

BKGrimes CERossi BABoger GHMarcus

02/ /93 02/ /93 02/ /93 OGCB:DORS:NRR HICB:DRCH: RR &J .DRCH:NRR C/H RCH:NRR RPB:ADM

AJKugler.it SVAthavale JWe lel TechEd

02/ S/9?3U 02/8 /93 a-. 02/ /9< 02/10/93 02/ /93 Lif

IN 93-XX

February XX, 1993 To prevent this deficiency in future products, Weschler has revised its

production inspection procedures to specifically require checking the

dimensions in question. In addition, Weschler has revised its nuclear quality

assurance procedures to require specific checks of torsion head screw

dimensions, although the vendor has not detected a problem with meters

manufactured specifically for safety-related applications.

Weschler could not determine whether or not any Model 252 switchboard meters

sold as commercial grade items through the various distributors had been

dedicated for use in nuclear safety-related applications. Therefore, Weschler

has not directly notified any licensees about this problem.

Weschler stated that the principal corrective action it has taken for affected

meters returned to it for repair and recalibration is to replace the faulty

torsion head screws because they can not be repaired. Weschler will provide

information about the problem and the recommended corrective measures to

licensees upon request.

This information notice requires no specific action or written response. If

you have any questions about the information in this notice, please contact

the technical contact listed below or the appropriate Office of Nuclear

Reactor Regulation (NRR) project manager.

Brian K. Grimes, Director

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical contact: S. V. Athavale

(301) 504-2974 Attachment: List of Recently Issued NRC Information Notices

D/DORS:NRR D/DRIL:NRR D/DRCH:NRR C/OGCB:DORS:NRR

BKGrimes CERossi BABoger GHMarcus

02/ /93 02/ /93 02/ /93 02/ /93 OGCB:DORS:NRR HICB:DRCH:NRR SC/HICB:DRCH:NRR C/HICB:DRCH:NRR RPB:ADM

AJKugler

02/ /93 SVAthavale

02/ /93 JMauck

02/ /93 JWermiel

02/ /93 TechEd 1&'a;n

02/1 /93 ap

a


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