Information Notice 1994-18, Accuracy of Motor-Operated Valve Diagnostic Equipment (Responses to Supplement 5 to Generic Letter 89-10): Difference between revisions

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| issue date = 03/16/1994
| issue date = 03/16/1994
| title = Accuracy of Motor-Operated Valve Diagnostic Equipment (Responses to Supplement 5 to Generic Letter 89-10)
| title = Accuracy of Motor-Operated Valve Diagnostic Equipment (Responses to Supplement 5 to Generic Letter 89-10)
| author name = Grimes B K
| author name = Grimes B
| author affiliation = NRC/NRR
| author affiliation = NRC/NRR
| addressee name =  
| addressee name =  
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| page count = 9
| page count = 9
}}
}}
{{#Wiki_filter:' .,^ -/UNITED STATESNUCLEAR REGULATORY COMMISSIONOFFICE OF NUCLEAR REACTOR REGULATIONWASHINGTON, D.C. 20555March 16, 1994NRC INFORMATION NOTICE 94-18:ACCURACY OF MOTOR-OPERATED VALVE DIAGNOSTICEQUIPMENT (RESPONSES TO SUPPLEMENT 5 TOGENERIC LETTER 89-10)
{{#Wiki_filter:' .,                                                             ^- /
                                        UNITED STATES
 
NUCLEAR REGULATORY COMMISSION
 
OFFICE OF NUCLEAR REACTOR REGULATION
 
WASHINGTON, D.C. 20555 March 16, 1994 NRC INFORMATION NOTICE 94-18:   ACCURACY OF MOTOR-OPERATED VALVE DIAGNOSTIC
 
EQUIPMENT (RESPONSES TO SUPPLEMENT 5 TO
 
GENERIC LETTER 89-10)


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


==Purpose==
==Purpose==
This information notice is intended to alert addressees to informationsubmitted by various nuclear power plant licensees related to the accuracy ofmotor-operated valve (MOV) diagnostic equipment. The information wassubmitted in response to Supplement 5, "Inaccuracy of Motor-Operated ValveDiagnostic Equipment," to Generic Letter (GL) 89-10, "Safety-Related Motor-Operated Valve Testing and Surveillance." It is expected that recipients willreview the information for applicability to their facilities and consideractions, as appropriate, related to operability of MOYs. However, suggestionscontained in this information notice do not constitute NRC requirements;therefore, no specific action or written response is required.BackgroundIn GL 89-10 (June 28, 1989), the NRC staff asked holders of operating licensesand construction permits for nuclear power plants to provide additionalassurance of the capability of safety-related MOVs and certain other MOVs insafety-related systems to perform their intended functions by reviewing MOVdesign bases, verifying MOV switch settings initially and periodically,testing MOVs under design-basis conditions where practicable, improvingevaluations of MOV failures and necessary corrective action and trending MOVproblems. The NRC staff issued several supplements to GL 89-10 to clarify ormodify its recommendations.As an integral part of most GL 89-10 programs, licensees are relying on MOVdiagnostic equipment to provide information on the thrust required to open orclose the valve, as well as the thrust delivered by the motor actuator. Thevarious types of MOV diagnostic equipment estimate stem thrust using differentmethods, such as spring pack displacement or strain in the stem, the mountingbolts, or the yoke. Because some licensees make decisions regarding theoperability of safety-related MOVs on the bases of diagnostic equipment9403100159 ftR-I 311qq -0i ~7'4031I
This information notice is intended to alert addressees to information
 
submitted by various nuclear power plant licensees related to the accuracy of
 
motor-operated valve (MOV) diagnostic equipment. The information was
 
submitted in response to Supplement 5, "Inaccuracy of Motor-Operated Valve
 
Diagnostic Equipment," to Generic Letter (GL) 89-10, "Safety-Related Motor- Operated Valve Testing and Surveillance." It is expected that recipients will
 
review the information for applicability to their facilities and consider
 
actions, as appropriate, related to operability of MOYs. However, suggestions
 
contained in this information notice do not constitute NRC requirements;
      therefore, no specific action or written response is required.
 
Background
 
In GL 89-10 (June 28, 1989), the NRC staff asked holders of operating licenses
 
and construction permits for nuclear power plants to provide additional
 
assurance of the capability of safety-related MOVs and certain other MOVs in
 
safety-related systems to perform their intended functions by reviewing MOV
 
design bases, verifying MOV switch settings initially and periodically, testing MOVs under design-basis conditions where practicable, improving
 
evaluations of MOV failures and necessary corrective action and trending MOV
 
problems. The NRC staff issued several supplements to GL 89-10 to clarify or
 
modify its recommendations.
 
As an integral part of most GL 89-10 programs, licensees are relying on MOV
 
diagnostic equipment to provide information on the thrust required to open or
 
close the valve, as well as the thrust delivered by the motor actuator. The
 
various types of MOV diagnostic equipment estimate stem thrust using different
 
methods, such as spring pack displacement or strain in the stem, the mounting
 
bolts, or the yoke. Because some licensees make decisions regarding the
 
operability of safety-related MOVs on the bases of diagnostic equipment
 
9403100159 ftR                                     q -0i   ~
                                                                          7'4031I
 
-I    311q
 
''-IN 94-18 March 16, 1994 thrust readings, the accuracy of MOV diagnostic equipment can have a
 
significant effect on the safe operation of a nuclear power plant.
 
During the implementation of GL 89-10, the NRC staff became aware of new
 
information on the accuracy of MOV diagnostic equipment. This new information
 
raised a generic concern regarding the reliability of the data produced by MOV
 
diagnostic equipment. For example, on February 3, 1992, the MOV Users Group
 
(MUG) of nuclear power plant licensees released "Final Report - MUG Validation
 
Testing as Performed at Idaho National Engineering Laboratories" (Volume 1).
 
The report stated that the MOV diagnostic equipment that relied on spring pack
 
displacement to estimate stem thrust was not as accurate as its vendors
 
claimed. In addition, the NRC staff learned that specific MOV diagnostic
 
equipment that relies on valve yoke strain to estimate stem thrust was less
 
accurate than had been previously reported.
 
On March 2, 1992, the NRC staff held a public meeting with representatives of
 
ITI-MOVATS to discuss the accuracy of the ITI-MOVATS thrust measuring device
 
(TMD) to estimate stem thrust on the basis of spring pack displacement. At
 
this meeting, the representatives of ITI-MOVATS described the results of their
 
field validation program which showed that, in some instances, the TMD may be
 
less accurate than licensees had assumed. The ITI-MOVATS representatives also
 
discussed the results of their activities to resolve concerns about the fact
 
that the TMD is calibrated in the valve opening direction, although it also is
 
used to predict the thrust delivered by the actuator in the valve closing
 
direction. ITI-MOVATS prepared Engineering Report 5.2 (March 13, 1992) to
 
provide guidance to its licensee customers for evaluating the capability of an
 
MOV to perform its safety function under design-basis conditions in light of
 
the decreased accuracy of the TMD. The Nuclear Management and Resources
 
Council (NUMARC) developed guidelines for licensees to use in evaluating MOVs
 
that had been set up using the TMD.
 
ASEA-Brown Boveri (ABB) Impell manufactures MOV diagnostic equipment (known as
 
OATIS) that relies on spring pack displacement to estimate stem thrust.
 
Following the release of the MUG report, Impell representatives stated that
 
they would be working with their licensee customers to develop new accuracy
 
values.
 
Liberty Technologies has manufactured MOV diagnostic equipment, referred to as
 
valve operation test and evaluation system (VOTES), that estimates the thrust
 
required to open or close a valve based on the strain of the valve yoke.
 
The VOTES system does this by measuring the diametral strain (the change in
 
diameter) of the valve stem for a given yoke strain. The stem thrust is then
 
calculated using the diametral strain and the nominal engineering properties
 
of the stem. This stem thrust is compared to the yoke strain to provide a
 
correlation between the yoke strain and the stem thrust. Once this
 
correlation has been established, the stem thrust can be more easily
 
determined by measuring the yoke strain. On October 2, 1992, Liberty
 
Technologies notified the NRC, in accordance with 10 CFR Part 21, that it had
 
found two new factors that can affect the thrust values obtained with its
 
VOTES equipment. Those factors are (1) the possible use of improper stem
 
\-'IN 94-18 March 16, 1994 material constants and (2) the failure to account for a torque effect when the
 
equipment is calibrated by measuring the strain of the threaded portion of a
 
valve stem.
 
In its October 2 submittal, Liberty Technologies provided guidance to
 
licensees for correcting the thrust data by performing hand calculations, and
 
stated that the new Version 2.3 of its VOTES software would be of help in
 
performing the corrections.
 
On June 28, 1993, the NRC staff issued Supplement 5 to GL 89-10 requesting


''-IN 94-18March 16, 1994 thrust readings, the accuracy of MOV diagnostic equipment can have asignificant effect on the safe operation of a nuclear power plant.During the implementation of GL 89-10, the NRC staff became aware of newinformation on the accuracy of MOV diagnostic equipment. This new informationraised a generic concern regarding the reliability of the data produced by MOVdiagnostic equipment. For example, on February 3, 1992, the MOV Users Group(MUG) of nuclear power plant licensees released "Final Report -MUG ValidationTesting as Performed at Idaho National Engineering Laboratories" (Volume 1).The report stated that the MOV diagnostic equipment that relied on spring packdisplacement to estimate stem thrust was not as accurate as its vendorsclaimed. In addition, the NRC staff learned that specific MOV diagnosticequipment that relies on valve yoke strain to estimate stem thrust was lessaccurate than had been previously reported.On March 2, 1992, the NRC staff held a public meeting with representatives ofITI-MOVATS to discuss the accuracy of the ITI-MOVATS thrust measuring device(TMD) to estimate stem thrust on the basis of spring pack displacement. Atthis meeting, the representatives of ITI-MOVATS described the results of theirfield validation program which showed that, in some instances, the TMD may beless accurate than licensees had assumed. The ITI-MOVATS representatives alsodiscussed the results of their activities to resolve concerns about the factthat the TMD is calibrated in the valve opening direction, although it also isused to predict the thrust delivered by the actuator in the valve closingdirection. ITI-MOVATS prepared Engineering Report 5.2 (March 13, 1992) toprovide guidance to its licensee customers for evaluating the capability of anMOV to perform its safety function under design-basis conditions in light ofthe decreased accuracy of the TMD. The Nuclear Management and ResourcesCouncil (NUMARC) developed guidelines for licensees to use in evaluating MOVsthat had been set up using the TMD.ASEA-Brown Boveri (ABB) Impell manufactures MOV diagnostic equipment (known asOATIS) that relies on spring pack displacement to estimate stem thrust.Following the release of the MUG report, Impell representatives stated thatthey would be working with their licensee customers to develop new accuracyvalues.Liberty Technologies has manufactured MOV diagnostic equipment, referred to asvalve operation test and evaluation system (VOTES), that estimates the thrustrequired to open or close a valve based on the strain of the valve yoke.The VOTES system does this by measuring the diametral strain (the change indiameter) of the valve stem for a given yoke strain. The stem thrust is thencalculated using the diametral strain and the nominal engineering propertiesof the stem. This stem thrust is compared to the yoke strain to provide acorrelation between the yoke strain and the stem thrust. Once thiscorrelation has been established, the stem thrust can be more easilydetermined by measuring the yoke strain. On October 2, 1992, LibertyTechnologies notified the NRC, in accordance with 10 CFR Part 21, that it hadfound two new factors that can affect the thrust values obtained with itsVOTES equipment. Those factors are (1) the possible use of improper stem
licensees and construction permit holders (1) to re-examine their MOV programs


\-'IN 94-18March 16, 1994 material constants and (2) the failure to account for a torque effect when theequipment is calibrated by measuring the strain of the threaded portion of avalve stem.In its October 2 submittal, Liberty Technologies provided guidance tolicensees for correcting the thrust data by performing hand calculations, andstated that the new Version 2.3 of its VOTES software would be of help inperforming the corrections.On June 28, 1993, the NRC staff issued Supplement 5 to GL 89-10 requestinglicensees and construction permit holders (1) to re-examine their MOV programsand to identify measures taken to account for uncertainties in properlysetting valve operating thrust to ensure operability and (2) to evaluate theschedule necessary to first consider the new information on MOV diagnosticequipment inaccuracy and then to take appropriate action'in response to thatinformation. Within 90 days of receipt of Supplement 5 to 4L 89-10, licenseeswere required (1) to notify the NRC staff of the diagnostic equipment used toconfirm the proper size, or to establish settings, for safety-related MOVs,and (2) to report whether they had taken actions or planned to take actions(including schedule) to address the new information on the accuracy of MOVdiagnostic equipment.
and to identify measures taken to account for uncertainties in properly
 
setting valve operating thrust to ensure operability and (2) to evaluate the
 
schedule necessary to first consider the new information on MOV diagnostic
 
equipment inaccuracy and then to take appropriate action'in response to that
 
information. Within 90 days of receipt of Supplement 5 to 4L 89-10, licensees
 
were required (1) to notify the NRC staff of the diagnostic equipment used to
 
confirm the proper size, or to establish settings, for safety-related MOVs, and (2) to report whether they had taken actions or planned to take actions
 
(including schedule) to address the new information on the accuracy of MOV
 
diagnostic equipment.


==Description of Circumstances==
==Description of Circumstances==
The NRC staff has reviewed the responses to Supplement 5 to GL 89-10 submittedby licensees and construction permit holders. The staff has found that, forthe most part, licensees and permit holders have been actively addressing theuncertainties regarding the accuracy of MOV diagnostic equipment. The newlyrecognized reduced accuracy of MOV diagnostic equipment can raise questionsregarding (1) the adequacy of torque switch settings to provide sufficientthrust while not exceeding thrust or torque structural limits and (2) thecapability of actuator motors with the present settings. In their responses,licensees and permit holders indicated that many MOVs had the potential forunderthrusting or overthrusting as a result of the less-than-expected accuracyof MOV diagnostic equipment. Consequently, some licensees reported that MOVshave been retested, adjusted, or modified to resolve the concerns regardingthe accuracy of MOV diagnostic equipment. The staff will discuss specificaspects of the response to Supplement 5 to GL 89-10 with individual licenseesduring future inspections.The following is a summary of the issues relating to the accuracy of MOVdiagnostic equipment as reported by licensees in their responses toSupplement 5 to GL 89-10.1. ITI-MOVATS Engineering Report 5.2 discussed the calibration of the ITI-MOVATS TMD in the open direction with reliance on the calibration tomeasure thrust in the close direction. This ITI-MOVATS report focuses onaccuracy corrections for the TMD under static test conditions. The NRCstaff knows of no ITI-MOVATS guidance related to accuracy corrections forthe use of the TMD under dynamic test condition IN 94-18March 16, 1994 . The temporary installation of the ITI-MOVATS torque thrust cell (TTC) fordiagnostic testing can affect the actuator output thrust. ITI-MOVATSSpecial Test Report 6.0 addresses the actuator repositioning effect. Thelicensee of the Oyster Creek Nuclear Power Plant stated in its response toSupplement 5 to GL 89-10 that this special test report indicates that ITI-MOVATS recommends that actuator repeatability values and thrust/torquemeasurement error values be revised when using a temporarily installedTTC.3. The torque effects and the material characteristics that are relevant tothe use of the Liberty Technologies' VOTES diagnostic equipment isdiscussed in this company's Part 21 notification of October 2, 1992.4. In addition to the issues involving torque effects and materialcharacteristics, Liberty stated in its Part 21 notification of October 2,1992, that (a) incorrect thrust readings can arise with the use of longcable lengths between the signal conditioning box and the breakout boxwhen calibrating a VOTES sensor with a U-clamp or D-clamp; (b) undercertain conditions, one or more of the four operational amplifiers in thebreakout box oscillates and causes a thrust indication which can be loweror higher than actual by a factor of about two or four; and (c) CB 23-100cables were mistakenly shipped without the offset resistor (which resultsin a lower-than-actual torque indication from the VTC load cell).5. The licensee of the Cooper Nuclear Power Plant reported in its response toSupplement 5 to GL 89-10 that Liberty Technologies is evaluating the issueof calibration of its equipment in one direction and reliance on thrustmeasurements in the other direction.6. The Cooper licensee reported that Liberty Customer Service BulletinCSB-030 (May 6, 1993), 'Proximity Probe Type Calibrators With a Possible3% Shift in Sensitivity," alerts VOTES users to possible changes in thesensitivity of the proximity probe-type calibrator that can overpredictthrust readings.7. The licensee of the Susquehanna Nuclear Power Station reported in itsresponse to Supplement 5 to GL 89-10 that factors that can affect VOTESaccuracy are (a) the change in stem transition areas resulting fromLiberty Technologies' refinement of its finite element model, (b) changesin effective stem diameters, (c) the need to differentiate between General
The NRC staff has reviewed the responses to Supplement 5 to GL 89-10 submitted
 
by licensees and construction permit holders. The staff has found that, for
 
the most part, licensees and permit holders have been actively addressing the
 
uncertainties regarding the accuracy of MOV diagnostic equipment. The newly
 
recognized reduced accuracy of MOV diagnostic equipment can raise questions
 
regarding (1) the adequacy of torque switch settings to provide sufficient
 
thrust while not exceeding thrust or torque structural limits and (2) the
 
capability of actuator motors with the present settings. In their responses, licensees and permit holders indicated that many MOVs had the potential for
 
underthrusting or overthrusting as a result of the less-than-expected accuracy
 
of MOV diagnostic equipment. Consequently, some licensees reported that MOVs
 
have been retested, adjusted, or modified to resolve the concerns regarding
 
the accuracy of MOV diagnostic equipment. The staff will discuss specific
 
aspects of the response to Supplement 5 to GL 89-10 with individual licensees
 
during future inspections.
 
The following is a summary of the issues relating to the accuracy of MOV
 
diagnostic equipment as reported by licensees in their responses to
 
Supplement 5 to GL 89-10.
 
1. ITI-MOVATS Engineering Report 5.2 discussed the calibration of the ITI-
    MOVATS TMD in the open direction with reliance on the calibration to
 
measure thrust in the close direction. This ITI-MOVATS report focuses on
 
accuracy corrections for the TMD under static test conditions. The NRC
 
staff knows of no ITI-MOVATS guidance related to accuracy corrections for
 
the use of the TMD under dynamic test conditions.
 
IN 94-18 March 16, 1994 2. The temporary installation of the ITI-MOVATS torque thrust cell (TTC) for
 
diagnostic testing can affect the actuator output thrust. ITI-MOVATS
 
Special Test Report 6.0 addresses the actuator repositioning effect. The
 
licensee of the Oyster Creek Nuclear Power Plant stated in its response to
 
Supplement 5 to GL 89-10 that this special test report indicates that ITI-
    MOVATS recommends that actuator repeatability values and thrust/torque
 
measurement error values be revised when using a temporarily installed
 
TTC.
 
3. The torque effects and the material characteristics that are relevant to
 
the use of the Liberty Technologies' VOTES diagnostic equipment is
 
discussed in this company's Part 21 notification of October 2, 1992.
 
4. In addition to the issues involving torque effects and material
 
characteristics, Liberty stated in its Part 21 notification of October 2,
    1992, that (a) incorrect thrust readings can arise with the use of long
 
cable lengths between the signal conditioning box and the breakout box
 
when calibrating a VOTES sensor with a U-clamp or D-clamp; (b) under
 
certain conditions, one or more of the four operational amplifiers in the
 
breakout box oscillates and causes a thrust indication which can be lower
 
or higher than actual by a factor of about two or four; and (c) CB 23-100
    cables were mistakenly shipped without the offset resistor (which results
 
in a lower-than-actual torque indication from the VTC load cell).
 
5. The licensee of the Cooper Nuclear Power Plant reported in its response to
 
Supplement 5 to GL 89-10 that Liberty Technologies is evaluating the issue
 
of calibration of its equipment in one direction and reliance on thrust
 
measurements in the other direction.
 
6. The Cooper licensee reported that Liberty Customer Service Bulletin
 
CSB-030 (May 6, 1993), 'Proximity Probe Type Calibrators With a Possible
 
3% Shift in Sensitivity," alerts VOTES users to possible changes in the
 
sensitivity of the proximity probe-type calibrator that can overpredict
 
thrust readings.
 
7. The licensee of the Susquehanna Nuclear Power Station reported in its
 
response to Supplement 5 to GL 89-10 that factors that can affect VOTES
 
accuracy are (a) the change in stem transition areas resulting from
 
Liberty Technologies' refinement of its finite element model, (b) changes
 
in effective stem diameters, (c) the need to differentiate between General


==Purpose==
==Purpose==
ACME and Stub ACME threads when determining torque correctionfactors and effective stem diameters, and (d) new accuracy values based ontorque correction values and percent extrapolation beyond calibrationranges.8. The licensee of the Maine Yankee Nuclear Power Plant noted in its responseto Supplement 5 to GL 89-10 that it had submitted a notice in accordancewith 10 CFR Part 21 on July 21, 1993, regarding its determination that theaccuracy cited by Liberty Technologies for its VOTES equipment is only IN 94-18March 16, 1994 appropriate for torque switch trip when the Best-Fit-Straight-Line (BFSL)calibration method is used. As a result of this question regarding theaccuracy of the VOTES calibration method, the Susquehanna licenseereported that its diagnostic tests will need to be repeated using the BFSLcalibration method. Liberty Technologies is in the process of issuing acustomer service bulletin that will give guidance on the inaccuracies ofthe results obtained by using the BFSL method. The service bulletin willalso include a summary of a statistical analysis that was done to verifythe accuracy of the BFSL method.Related Generic CommunicationsThe NRC has issued other generic communications on the accuracy of MOYdiagnostic equipment. For example, the NRC issued Inforpation Notice (IN)92-23, "Results of Validation Testing of Motor-Operated Valye DiagnosticEquipment," to alert licensees to the potential decreased accuracy of MOVdiagnostic equipment manufactured by ITI-MOVATS and ABB Impell; and IN 93-01,"Accuracy of Motor-Operated Valve Diagnostic Equipment Manufactured by LibertyTechnologies.'This information notice requires no specific action or written response. Ifyou have any questions about the information in this notice, please contactone of the technical contacts listed below.Brian K. Grimes, DirectorDivision of Operating Reactor SupportOffice of Nuclear Reactor RegulationTechnical contacts: Thomas G. Scarbrough, NRR(301) 504-2794Allen G. Hansen, NRR(301) 504-1390
ACME and Stub ACME threads when determining torque correction
 
factors and effective stem diameters, and (d) new accuracy values based on
 
torque correction values and percent extrapolation beyond calibration
 
ranges.
 
8. The licensee of the Maine Yankee Nuclear Power Plant noted in its response
 
to Supplement 5 to GL 89-10 that it had submitted a notice in accordance
 
with 10 CFR Part 21 on July 21, 1993, regarding its determination that the
 
accuracy cited by Liberty Technologies for its VOTES equipment is only
 
IN 94-18 March 16, 1994 appropriate for torque switch trip when the Best-Fit-Straight-Line (BFSL)
    calibration method is used. As a result of this question regarding the
 
accuracy of the VOTES calibration method, the Susquehanna licensee
 
reported that its diagnostic tests will need to be repeated using the BFSL
 
calibration method. Liberty Technologies is in the process of issuing a
 
customer service bulletin that will give guidance on the inaccuracies of
 
the results obtained by using the BFSL method. The service bulletin will
 
also include a summary of a statistical analysis that was done to verify
 
the accuracy of the BFSL method.
 
===Related Generic Communications===
The NRC has issued other generic communications on the accuracy of MOY
 
diagnostic equipment. For example, the NRC issued Inforpation Notice (IN)
92-23, "Results of Validation Testing of Motor-Operated Valye Diagnostic
 
Equipment," to alert licensees to the potential decreased accuracy of MOV
 
diagnostic equipment manufactured by ITI-MOVATS and ABB Impell; and IN 93-01,
"Accuracy of Motor-Operated Valve Diagnostic Equipment Manufactured by Liberty
 
Technologies.'
This information notice requires no specific action or written response. If
 
you have any questions about the information in this notice, please contact
 
one of the technical contacts listed below.
 
Brian K. Grimes, Director
 
Division of Operating Reactor Support
 
Office of Nuclear Reactor Regulation
 
Technical contacts:  Thomas G. Scarbrough, NRR
 
(301) 504-2794 Allen G. Hansen, NRR
 
(301) 504-1390
Attachment:
 
===List of Recently Issued NRC Information Notices===
 
Attachment
 
IN 94-18 March 16, 1994 LIST OF RECENTLY ISSUED
 
NRC INFORMATION NOTICES
 
Information                                  Date of
 
Notice No.            Subject                Issuance    Issued to
 
94-17          Strontium-9O Eye Appli-        03/11/94    All U.S. Nuclear Regulatory
 
cators: Submission of                      Commission Medical Use
 
Quality Management Plan                    Licensees.
 
(QMP), Calibration, and
 
Use
 
94-16          Recent Incidents Resulting      03/03/94    All U.S. Nuclear Regulatory
 
in Offsite Contamination                    Commission material and fuel
 
cycle licensees.
 
94-15          Radiation Exposures during      03/02/94  All U.S. Nuclear Regulatory
 
an Event Involving a Fixed                  Commission licensees author- Nuclear Gauge                              ized to possess, use, manu- facture, or distribute
 
industrial nuclear gauges.
 
94-14          Failure to Implement          02/24/94    All holders of OLs or CPs
 
Requirements for Biennial                  for nuclear power and non- Medical Examinations and                  power reactors and all
 
Notification to the NRC                    licensed reactor operators
 
of Changes in Licensed                    and senior reactor
 
Operator Medical Conditions                operators.
 
92-36,          Intersystem LOCA              02/22/94    All holders of OLs or CPs
 
Supp. 1        Outside Containment                        for nuclear power reactors.
 
94-13          Unanticipated and Un-          02/22/94    All holders of OLs or CPs
 
intended Movement of                      for nuclear power reactors.
 
Fuel Assemblies and
 
Other Components due to
 
Improper Operation of
 
Refueling Equipment
 
94-12          Insights Gained from            02/09/94    All holders of OLs or CPs
 
Resolving Generic                          for nuclear power reactors.
 
Issue 57: Effects of
 
Fire Protection System
 
Actuation on Safety- Related Equipment
 
OL - Operating License
 
CP = Construction Permit
 
' IN 94-18 March 16, 1994 appropriate for torque switch trip when the Best-Fit-Straight-Line (BFSL)
    calibration method is used. As a result of this question regarding the
 
accuracy of the VOTES calibration method, the Susquehanna licensee
 
reported that its diagnostic tests will need to be repeated using the BFSL
 
calibration method. Liberty Technologies is in the process of issuing a
 
customer service bulletin that will give guidance on the inaccuracies of
 
the results obtained by using the BFSL method. The service bulletin will
 
also include a summary of a statistical analysis that was done to verify
 
the accuracy of the BFSL method.
 
===Related Generic Communications===
The NRC has issued other generic communications on the accuracy of MOV
 
diagnostic equipment. For example, the NRC issued Information Notice (IN)
92-23, "Results of Validation Testing of Motor-Operated Valve Diagnostic
 
Equipment," to alert licensees to the potential decreased accuracy of MOV
 
diagnostic equipment manufactured by ITI-MOVATS and ABB Impell; and IN 93-01,
"Accuracy of Motor-Operated Valve Diagnostic Equipment Manufactured by Liberty
 
Technologies."
This information notice requires no specific action or written response. If
 
you have any questions about the information in this notice, please contact
 
one of the technical contacts listed below.
 
Odgfnal igned by
 
Brian K. Grimes
 
Brian K. Grimes, Director
 
Division of Operating Reactor Support
 
Office of Nuclear Reactor Regulation
 
Technical contacts:      Thomas G. Scarbrough, NRR
 
(301) 504-2794 Allen G. Hansen, NRR
 
(301) 504-1390
Attachment:
 
===List of Recently Issued NRC Information Notices===
*SEE PREVIOUS CONCURRENCE
 
OFFICE  DE/EMEB*          OGCB/DORS*        *TECH ED      DE/EMEB*          C:DE:EMEB
 
NAME    AGHansen          DCKirkpatrick    RSanders      TScarbrough        JNorberg
 
DATE    J_01/31/94      I01/27/94 _        01/494 i1.A-
                                                              01/31/94        101/31/94 D:DE/NRR*    I AC:OGCB/DORS*
  WHodges        AJKugler          JA    IIII
 
02/01/94        03/03/94          103/I  /94 UUMUMtNI  NAMt:    %-1W.IrN
 
IN 94-XX
 
March xx, 1994 This information notice requires no specific action or written response. If
 
you have any questions about the information in this notice, please contact
 
one of the technical contacts listed below.
 
Brian K. Grimes, Director
 
Division of Operating Reactor Support
 
Office of Nuclear Reactor Regulation
 
Technical Contacts:    Thomas G. Scarbrough, NRR
 
(301) 504-2794 Allen G. Hansen, NRR
 
(301) 504-1390
*SEE PREVIOUS CONCURRENCE
 
OFFICE    DE/EMEB*      OGCB/DORS*      *TECH ED    DE/EMEB*        C:DE:EMEB
 
NAME    AGHansen      DCKirkpatrick  RSanders    TScarbrough    JNorberg
 
DATE    J01/31/94    101/27/94        j01/14/94    01/31/94      I01/31/94 D:DE/NRR*      AC:OGCB/DORS      D:DORS/NRR
 
WHodges        AJKuglerq'-      BKGrimes  II
 
02/01/94      03/03/94          03/  /94 UULUMtN I N.AM :  iLUIUbb. IN
 
IN 94-XX
 
February xx, 1994 This information notice requires no specific action or written response. If
 
you have any questions about the information in this notice, please contact
 
one of the technical contacts listed below.
 
Brian K. Grimes, Director
 
Division of Operating Reactor Support
 
Office of Nuclear Reactor Regulation
 
Technical Contacts:         Thomas G. Scarbrough, NRR
 
(301) 504-2794 Allen G. Hansen, NRR
 
(301) 504-1390
*SEE PREVIOUS CONCURRENCE
 
OFFICE        -D9'M/iDB      OGCB DORS        *TECH ED    DE/EMEB tA 4    rC C
 
NAME          AGHans e        DCKirkpatrick    RSanders    TScarbrough      JN Xerg
 
DATE                7Z
 
/94  D<_      /94        01/14/94    0t/.z/94      I0t/.Ti/94 D:DE/NRR            C:OGCB/DORS        D:DORS/NRR


===Attachment:===
WHodgesg            -6HMar4cus          BKGrimes
List of Recently Issued NRC Information Notices AttachmentIN 94-18March 16, 1994 LIST OF RECENTLY ISSUEDNRC INFORMATION NOTICESInformation Date ofNotice No. Subject Issuance Issued to94-1794-1694-1594-14Strontium-9O Eye Appli-cators: Submission ofQuality Management Plan(QMP), Calibration, andUseRecent Incidents Resultingin Offsite ContaminationRadiation Exposures duringan Event Involving a FixedNuclear GaugeFailure to ImplementRequirements for BiennialMedical Examinations andNotification to the NRCof Changes in LicensedOperator Medical ConditionsIntersystem LOCAOutside ContainmentUnanticipated and Un-intended Movement ofFuel Assemblies andOther Components due toImproper Operation ofRefueling EquipmentInsights Gained fromResolving GenericIssue 57: Effects ofFire Protection SystemActuation on Safety-Related Equipment03/11/9403/03/9403/02/9402/24/9402/22/9402/22/9402/09/94All U.S. Nuclear RegulatoryCommission Medical UseLicensees.All U.S. Nuclear RegulatoryCommission material and fuelcycle licensees.All U.S. Nuclear RegulatoryCommission licensees author-ized to possess, use, manu-facture, or distributeindustrial nuclear gauges.All holders of OLs or CPsfor nuclear power and non-power reactors and alllicensed reactor operatorsand senior reactoroperators.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.92-36,Supp. 194-1394-12OL -Operating LicenseCP = Construction Permit


' IN 94-18March 16, 1994 appropriate for torque switch trip when the Best-Fit-Straight-Line (BFSL)calibration method is used. As a result of this question regarding theaccuracy of the VOTES calibration method, the Susquehanna licenseereported that its diagnostic tests will need to be repeated using the BFSLcalibration method. Liberty Technologies is in the process of issuing acustomer service bulletin that will give guidance on the inaccuracies ofthe results obtained by using the BFSL method. The service bulletin willalso include a summary of a statistical analysis that was done to verifythe accuracy of the BFSL method.Related Generic CommunicationsThe NRC has issued other generic communications on the accuracy of MOVdiagnostic equipment. For example, the NRC issued Information Notice (IN)92-23, "Results of Validation Testing of Motor-Operated Valve DiagnosticEquipment," to alert licensees to the potential decreased accuracy of MOVdiagnostic equipment manufactured by ITI-MOVATS and ABB Impell; and IN 93-01,"Accuracy of Motor-Operated Valve Diagnostic Equipment Manufactured by LibertyTechnologies."This information notice requires no specific action or written response. Ifyou have any questions about the information in this notice, please contactone of the technical contacts listed below.Odgfnal igned byBrian K. GrimesBrian K. Grimes, DirectorDivision of Operating Reactor SupportOffice of Nuclear Reactor RegulationTechnical contacts: Thomas G. Scarbrough, NRR(301) 504-2794Allen G. Hansen, NRR(301) 504-1390
w]L      '1
  02// /94             02/  /94          02/  /94 AME AL9
        ..MA,ITNAME:
VO ..._U_                    5 ...


===Attachment:===
===DOCUM                  IL891055.1N===
List of Recently Issued NRC Information Notices*SEE PREVIOUS CONCURRENCEOFFICE DE/EMEB* OGCB/DORS* *TECH ED DE/EMEB* C:DE:EMEBNAME AGHansen DCKirkpatrick RSanders TScarbrough JNorbergDATE J_01/31/94 I 01/27/94 _ 01/494 01/31/94 1 01/31/94i 1. A-D:DE/NRR* I AC:OGCB/DORS*WHodges AJKugler JA IIII02/01/94 03/03/94 1 03/I /94UUMUMtNI NAMt: %-1W.IrN IN 94-XXMarch xx, 1994 This information notice requires no specific action or written response. Ifyou have any questions about the information in this notice, please contactone of the technical contacts listed below.Brian K. Grimes, DirectorDivision of Operating Reactor SupportOffice of Nuclear Reactor RegulationTechnical Contacts:Thomas G. Scarbrough, NRR(301) 504-2794Allen G. Hansen, NRR(301) 504-1390*SEE PREVIOUS CONCURRENCEOFFICE DE/EMEB* OGCB/DORS* *TECH ED DE/EMEB* C:DE:EMEBNAME AGHansen DCKirkpatrick RSanders TScarbrough JNorbergDATE J01/31/94 101/27/94 j01/14/94 01/31/94 I 01/31/94D:DE/NRR*AC:OGCB/DORSD:DORS/NRRWHodges AJKuglerq'- BKGrimes II02/01/94 03/03/94 03/ /94UULUMtN I N.AM : iLUIUbb. IN IN 94-XXFebruary xx, 994This information notice requires no specificyou have any questions about the informationone of the technical contacts listed below.action or written response. Ifin this notice, please contactBrian K. Grimes, DirectorDivision of Operating Reactor SupportOffice of Nuclear Reactor RegulationTechnical Contacts:Thomas G. Scarbrough, NRR(301) 504-2794Allen G. Hansen, NRR(301) 504-1390*SEE PREVIOUS CONCURRENCEOFFICE -D9'M/iDB OGCB DORS *TECH ED DE/EMEB tA 4 r C CNAME AGHans e DCKirkpatrick RSanders TScarbrough JN XergDATE 7Z /94 D<_ /94 01/14/94 0t/.z/94 I 0t/.Ti/94D:DE/NRRC:OGCB/DORSD:DORS/NRRWHodgesg -6HMar4cus w]L BKGrimes '102// /94 02/ /94 02/ /94VO ... _U_ ..MA, AME AL9 5 ...DOCUM IT NAME:OtfIL891055.1N}}
        Otf}}


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

Latest revision as of 04:26, 24 November 2019

Accuracy of Motor-Operated Valve Diagnostic Equipment (Responses to Supplement 5 to Generic Letter 89-10)
ML031060610
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: 03/16/1994
From: Grimes B
Office of Nuclear Reactor Regulation
To:
References
GL-89-010 IN-94-018, NUDOCS 9403100159
Download: ML031060610 (9)
v • d • e


' ., ^- /

UNITED STATES

NUCLEAR REGULATORY COMMISSION

OFFICE OF NUCLEAR REACTOR REGULATION

WASHINGTON, D.C. 20555 March 16, 1994 NRC INFORMATION NOTICE 94-18: ACCURACY OF MOTOR-OPERATED VALVE DIAGNOSTIC

EQUIPMENT (RESPONSES TO SUPPLEMENT 5 TO

GENERIC LETTER 89-10)

Addressees

All holders of operating licenses or construction permits for nuclear power

reactors.

Purpose

This information notice is intended to alert addressees to information

submitted by various nuclear power plant licensees related to the accuracy of

motor-operated valve (MOV) diagnostic equipment. The information was

submitted in response to Supplement 5, "Inaccuracy of Motor-Operated Valve

Diagnostic Equipment," to Generic Letter (GL) 89-10, "Safety-Related Motor- Operated Valve Testing and Surveillance." It is expected that recipients will

review the information for applicability to their facilities and consider

actions, as appropriate, related to operability of MOYs. However, suggestions

contained in this information notice do not constitute NRC requirements;

therefore, no specific action or written response is required.

Background

In GL 89-10 (June 28, 1989), the NRC staff asked holders of operating licenses

and construction permits for nuclear power plants to provide additional

assurance of the capability of safety-related MOVs and certain other MOVs in

safety-related systems to perform their intended functions by reviewing MOV

design bases, verifying MOV switch settings initially and periodically, testing MOVs under design-basis conditions where practicable, improving

evaluations of MOV failures and necessary corrective action and trending MOV

problems. The NRC staff issued several supplements to GL 89-10 to clarify or

modify its recommendations.

As an integral part of most GL 89-10 programs, licensees are relying on MOV

diagnostic equipment to provide information on the thrust required to open or

close the valve, as well as the thrust delivered by the motor actuator. The

various types of MOV diagnostic equipment estimate stem thrust using different

methods, such as spring pack displacement or strain in the stem, the mounting

bolts, or the yoke. Because some licensees make decisions regarding the

operability of safety-related MOVs on the bases of diagnostic equipment

9403100159 ftR q -0i ~

7'4031I

-I 311q

-IN 94-18 March 16, 1994 thrust readings, the accuracy of MOV diagnostic equipment can have a

significant effect on the safe operation of a nuclear power plant.

During the implementation of GL 89-10, the NRC staff became aware of new

information on the accuracy of MOV diagnostic equipment. This new information

raised a generic concern regarding the reliability of the data produced by MOV

diagnostic equipment. For example, on February 3, 1992, the MOV Users Group

(MUG) of nuclear power plant licensees released "Final Report - MUG Validation

Testing as Performed at Idaho National Engineering Laboratories" (Volume 1).

The report stated that the MOV diagnostic equipment that relied on spring pack

displacement to estimate stem thrust was not as accurate as its vendors

claimed. In addition, the NRC staff learned that specific MOV diagnostic

equipment that relies on valve yoke strain to estimate stem thrust was less

accurate than had been previously reported.

On March 2, 1992, the NRC staff held a public meeting with representatives of

ITI-MOVATS to discuss the accuracy of the ITI-MOVATS thrust measuring device

(TMD) to estimate stem thrust on the basis of spring pack displacement. At

this meeting, the representatives of ITI-MOVATS described the results of their

field validation program which showed that, in some instances, the TMD may be

less accurate than licensees had assumed. The ITI-MOVATS representatives also

discussed the results of their activities to resolve concerns about the fact

that the TMD is calibrated in the valve opening direction, although it also is

used to predict the thrust delivered by the actuator in the valve closing

direction. ITI-MOVATS prepared Engineering Report 5.2 (March 13, 1992) to

provide guidance to its licensee customers for evaluating the capability of an

MOV to perform its safety function under design-basis conditions in light of

the decreased accuracy of the TMD. The Nuclear Management and Resources

Council (NUMARC) developed guidelines for licensees to use in evaluating MOVs

that had been set up using the TMD.

ASEA-Brown Boveri (ABB) Impell manufactures MOV diagnostic equipment (known as

OATIS) that relies on spring pack displacement to estimate stem thrust.

Following the release of the MUG report, Impell representatives stated that

they would be working with their licensee customers to develop new accuracy

values.

Liberty Technologies has manufactured MOV diagnostic equipment, referred to as

valve operation test and evaluation system (VOTES), that estimates the thrust

required to open or close a valve based on the strain of the valve yoke.

The VOTES system does this by measuring the diametral strain (the change in

diameter) of the valve stem for a given yoke strain. The stem thrust is then

calculated using the diametral strain and the nominal engineering properties

of the stem. This stem thrust is compared to the yoke strain to provide a

correlation between the yoke strain and the stem thrust. Once this

correlation has been established, the stem thrust can be more easily

determined by measuring the yoke strain. On October 2, 1992, Liberty

Technologies notified the NRC, in accordance with 10 CFR Part 21, that it had

found two new factors that can affect the thrust values obtained with its

VOTES equipment. Those factors are (1) the possible use of improper stem

\-'IN 94-18 March 16, 1994 material constants and (2) the failure to account for a torque effect when the

equipment is calibrated by measuring the strain of the threaded portion of a

valve stem.

In its October 2 submittal, Liberty Technologies provided guidance to

licensees for correcting the thrust data by performing hand calculations, and

stated that the new Version 2.3 of its VOTES software would be of help in

performing the corrections.

On June 28, 1993, the NRC staff issued Supplement 5 to GL 89-10 requesting

licensees and construction permit holders (1) to re-examine their MOV programs

and to identify measures taken to account for uncertainties in properly

setting valve operating thrust to ensure operability and (2) to evaluate the

schedule necessary to first consider the new information on MOV diagnostic

equipment inaccuracy and then to take appropriate action'in response to that

information. Within 90 days of receipt of Supplement 5 to 4L 89-10, licensees

were required (1) to notify the NRC staff of the diagnostic equipment used to

confirm the proper size, or to establish settings, for safety-related MOVs, and (2) to report whether they had taken actions or planned to take actions

(including schedule) to address the new information on the accuracy of MOV

diagnostic equipment.

Description of Circumstances

The NRC staff has reviewed the responses to Supplement 5 to GL 89-10 submitted

by licensees and construction permit holders. The staff has found that, for

the most part, licensees and permit holders have been actively addressing the

uncertainties regarding the accuracy of MOV diagnostic equipment. The newly

recognized reduced accuracy of MOV diagnostic equipment can raise questions

regarding (1) the adequacy of torque switch settings to provide sufficient

thrust while not exceeding thrust or torque structural limits and (2) the

capability of actuator motors with the present settings. In their responses, licensees and permit holders indicated that many MOVs had the potential for

underthrusting or overthrusting as a result of the less-than-expected accuracy

of MOV diagnostic equipment. Consequently, some licensees reported that MOVs

have been retested, adjusted, or modified to resolve the concerns regarding

the accuracy of MOV diagnostic equipment. The staff will discuss specific

aspects of the response to Supplement 5 to GL 89-10 with individual licensees

during future inspections.

The following is a summary of the issues relating to the accuracy of MOV

diagnostic equipment as reported by licensees in their responses to

Supplement 5 to GL 89-10.

1. ITI-MOVATS Engineering Report 5.2 discussed the calibration of the ITI-

MOVATS TMD in the open direction with reliance on the calibration to

measure thrust in the close direction. This ITI-MOVATS report focuses on

accuracy corrections for the TMD under static test conditions. The NRC

staff knows of no ITI-MOVATS guidance related to accuracy corrections for

the use of the TMD under dynamic test conditions.

IN 94-18 March 16, 1994 2. The temporary installation of the ITI-MOVATS torque thrust cell (TTC) for

diagnostic testing can affect the actuator output thrust. ITI-MOVATS

Special Test Report 6.0 addresses the actuator repositioning effect. The

licensee of the Oyster Creek Nuclear Power Plant stated in its response to

Supplement 5 to GL 89-10 that this special test report indicates that ITI-

MOVATS recommends that actuator repeatability values and thrust/torque

measurement error values be revised when using a temporarily installed

TTC.

3. The torque effects and the material characteristics that are relevant to

the use of the Liberty Technologies' VOTES diagnostic equipment is

discussed in this company's Part 21 notification of October 2, 1992.

4. In addition to the issues involving torque effects and material

characteristics, Liberty stated in its Part 21 notification of October 2,

1992, that (a) incorrect thrust readings can arise with the use of long

cable lengths between the signal conditioning box and the breakout box

when calibrating a VOTES sensor with a U-clamp or D-clamp; (b) under

certain conditions, one or more of the four operational amplifiers in the

breakout box oscillates and causes a thrust indication which can be lower

or higher than actual by a factor of about two or four; and (c) CB 23-100

cables were mistakenly shipped without the offset resistor (which results

in a lower-than-actual torque indication from the VTC load cell).

5. The licensee of the Cooper Nuclear Power Plant reported in its response to

Supplement 5 to GL 89-10 that Liberty Technologies is evaluating the issue

of calibration of its equipment in one direction and reliance on thrust

measurements in the other direction.

6. The Cooper licensee reported that Liberty Customer Service Bulletin

CSB-030 (May 6, 1993), 'Proximity Probe Type Calibrators With a Possible

3% Shift in Sensitivity," alerts VOTES users to possible changes in the

sensitivity of the proximity probe-type calibrator that can overpredict

thrust readings.

7. The licensee of the Susquehanna Nuclear Power Station reported in its

response to Supplement 5 to GL 89-10 that factors that can affect VOTES

accuracy are (a) the change in stem transition areas resulting from

Liberty Technologies' refinement of its finite element model, (b) changes

in effective stem diameters, (c) the need to differentiate between General

Purpose

ACME and Stub ACME threads when determining torque correction

factors and effective stem diameters, and (d) new accuracy values based on

torque correction values and percent extrapolation beyond calibration

ranges.

8. The licensee of the Maine Yankee Nuclear Power Plant noted in its response

to Supplement 5 to GL 89-10 that it had submitted a notice in accordance

with 10 CFR Part 21 on July 21, 1993, regarding its determination that the

accuracy cited by Liberty Technologies for its VOTES equipment is only

IN 94-18 March 16, 1994 appropriate for torque switch trip when the Best-Fit-Straight-Line (BFSL)

calibration method is used. As a result of this question regarding the

accuracy of the VOTES calibration method, the Susquehanna licensee

reported that its diagnostic tests will need to be repeated using the BFSL

calibration method. Liberty Technologies is in the process of issuing a

customer service bulletin that will give guidance on the inaccuracies of

the results obtained by using the BFSL method. The service bulletin will

also include a summary of a statistical analysis that was done to verify

the accuracy of the BFSL method.

Related Generic Communications

The NRC has issued other generic communications on the accuracy of MOY

diagnostic equipment. For example, the NRC issued Inforpation Notice (IN)

92-23, "Results of Validation Testing of Motor-Operated Valye Diagnostic

Equipment," to alert licensees to the potential decreased accuracy of MOV

diagnostic equipment manufactured by ITI-MOVATS and ABB Impell; and IN 93-01,

"Accuracy of Motor-Operated Valve Diagnostic Equipment Manufactured by Liberty

Technologies.'

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

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

one of the technical contacts listed below.

Brian K. Grimes, Director

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical contacts: Thomas G. Scarbrough, NRR

(301) 504-2794 Allen G. Hansen, NRR

(301) 504-1390

Attachment:

List of Recently Issued NRC Information Notices

Attachment

IN 94-18 March 16, 1994 LIST OF RECENTLY ISSUED

NRC INFORMATION NOTICES

Information Date of

Notice No. Subject Issuance Issued to

94-17 Strontium-9O Eye Appli- 03/11/94 All U.S. Nuclear Regulatory

cators: Submission of Commission Medical Use

Quality Management Plan Licensees.

(QMP), Calibration, and

Use

94-16 Recent Incidents Resulting 03/03/94 All U.S. Nuclear Regulatory

in Offsite Contamination Commission material and fuel

cycle licensees.

94-15 Radiation Exposures during 03/02/94 All U.S. Nuclear Regulatory

an Event Involving a Fixed Commission licensees author- Nuclear Gauge ized to possess, use, manu- facture, or distribute

industrial nuclear gauges.

94-14 Failure to Implement 02/24/94 All holders of OLs or CPs

Requirements for Biennial for nuclear power and non- Medical Examinations and power reactors and all

Notification to the NRC licensed reactor operators

of Changes in Licensed and senior reactor

Operator Medical Conditions operators.

92-36, Intersystem LOCA 02/22/94 All holders of OLs or CPs

Supp. 1 Outside Containment for nuclear power reactors.

94-13 Unanticipated and Un- 02/22/94 All holders of OLs or CPs

intended Movement of for nuclear power reactors.

Fuel Assemblies and

Other Components due to

Improper Operation of

Refueling Equipment

94-12 Insights Gained from 02/09/94 All holders of OLs or CPs

Resolving Generic for nuclear power reactors.

Issue 57: Effects of

Fire Protection System

Actuation on Safety- Related Equipment

OL - Operating License

CP = Construction Permit

' IN 94-18 March 16, 1994 appropriate for torque switch trip when the Best-Fit-Straight-Line (BFSL)

calibration method is used. As a result of this question regarding the

accuracy of the VOTES calibration method, the Susquehanna licensee

reported that its diagnostic tests will need to be repeated using the BFSL

calibration method. Liberty Technologies is in the process of issuing a

customer service bulletin that will give guidance on the inaccuracies of

the results obtained by using the BFSL method. The service bulletin will

also include a summary of a statistical analysis that was done to verify

the accuracy of the BFSL method.

Related Generic Communications

The NRC has issued other generic communications on the accuracy of MOV

diagnostic equipment. For example, the NRC issued Information Notice (IN) 92-23, "Results of Validation Testing of Motor-Operated Valve Diagnostic

Equipment," to alert licensees to the potential decreased accuracy of MOV

diagnostic equipment manufactured by ITI-MOVATS and ABB Impell; and IN 93-01,

"Accuracy of Motor-Operated Valve Diagnostic Equipment Manufactured by Liberty

Technologies."

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

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

one of the technical contacts listed below.

Odgfnal igned by

Brian K. Grimes

Brian K. Grimes, Director

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical contacts: Thomas G. Scarbrough, NRR

(301) 504-2794 Allen G. Hansen, NRR

(301) 504-1390

Attachment:

List of Recently Issued NRC Information Notices

  • SEE PREVIOUS CONCURRENCE

OFFICE DE/EMEB* OGCB/DORS* *TECH ED DE/EMEB* C:DE:EMEB

NAME AGHansen DCKirkpatrick RSanders TScarbrough JNorberg

DATE J_01/31/94 I01/27/94 _ 01/494 i1.A-

01/31/94 101/31/94 D:DE/NRR* I AC:OGCB/DORS*

WHodges AJKugler JA IIII

02/01/94 03/03/94 103/I /94 UUMUMtNI NAMt:  %-1W.IrN

IN 94-XX

March xx, 1994 This information notice requires no specific action or written response. If

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

one of the technical contacts listed below.

Brian K. Grimes, Director

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical Contacts: Thomas G. Scarbrough, NRR

(301) 504-2794 Allen G. Hansen, NRR

(301) 504-1390

  • SEE PREVIOUS CONCURRENCE

OFFICE DE/EMEB* OGCB/DORS* *TECH ED DE/EMEB* C:DE:EMEB

NAME AGHansen DCKirkpatrick RSanders TScarbrough JNorberg

DATE J01/31/94 101/27/94 j01/14/94 01/31/94 I01/31/94 D:DE/NRR* AC:OGCB/DORS D:DORS/NRR

WHodges AJKuglerq'- BKGrimes II

02/01/94 03/03/94 03/ /94 UULUMtN I N.AM : iLUIUbb. IN

IN 94-XX

February xx, 1994 This information notice requires no specific action or written response. If

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

one of the technical contacts listed below.

Brian K. Grimes, Director

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical Contacts: Thomas G. Scarbrough, NRR

(301) 504-2794 Allen G. Hansen, NRR

(301) 504-1390

  • SEE PREVIOUS CONCURRENCE

OFFICE -D9'M/iDB OGCB DORS *TECH ED DE/EMEB tA 4 rC C

NAME AGHans e DCKirkpatrick RSanders TScarbrough JN Xerg

DATE 7Z

/94 D<_ /94 01/14/94 0t/.z/94 I0t/.Ti/94 D:DE/NRR C:OGCB/DORS D:DORS/NRR

WHodgesg -6HMar4cus BKGrimes

w]L '1

02// /94 02/ /94 02/ /94 AME AL9

..MA,ITNAME:

VO ..._U_ 5 ...

DOCUM IL891055.1N

Otf


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