Information Notice 1993-42, Failure of Anti-Rotation Keys in Motor-Operated Valves Manufactured by Yelan: 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 June 9, 1993 NRC INFORMATION


NOTICE 93-42: FAILURE OF ANTI-ROTATION
WASHINGTON, D.C. 20555 June 9, 1993 NRC INFORMATION NOTICE 93-42:     FAILURE OF ANTI-ROTATION KEYS IN MOTOR-OPERATED


KEYS IN MOTOR-OPERATED
VALVES MANUFACTURED BY VELAN
 
VALVES MANUFACTURED
 
BY VELAN


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


licenses or construction
reactors.
 
permits for nuclear power reactors.


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


Commission (NRC) is issuing this information
notice to alert addressees to potential problems resulting from the failure


notice to alert addressees
anti-rotation keys in motor-operated globe valves manufactured by Velan forValve


to potential
Corporation. It is expected that recipients will review the information to


problems resulting
applicability to their facilities and consider actions, as appropriate, avoid similar problems. However, suggestions contained in this information  or


from the failure of anti-rotation
notice do not constitute NRC requirements; therefore, no specific action


keys in motor-operated
written response is required.


globe valves manufactured
==Description of Circumstances==
On March 28, 1993, Wisconsin Public Service Corporation, the licensee for


by Velan Valve Corporation.
Kewaunee Nuclear Power Plant, reported that during motor-operated valve (MOV)
dynamic testing on March 27, 1993, one of two redundant safety injection


It is expected that recipients
recirculation valves to the refueling water storage tank failed to close


will review the information
completely. Investigation revealed that the anti-rotation device, an L-shaped


for applicability
key between the valve stem and the yoke bushing (Attachment 1), had broken.


to their facilities
The shorter part of the broken L-shaped key had apparently worked its way The


and consider actions, as appropriate, to avoid similar problems.
toward the valve stem and had jammed the valve stem, preventing closing.


However, suggestions
valve that failed was a 2-inch bonnetless globe valve manufactured by Velan and


contained
Valve Corp. The licensee inspected all nine similar motor-operated valves and


in this information
found that six had broken anti-rotation keys. The inspections were visual can


notice do not constitute
did not require disassembly of the motor-operated valve. Failures usually


NRC requirements;
be observed on normally closed valves, since the broken long leg of the
therefore, no specific action or written response is required.Description


of Circumstances
L-shaped key slides down partially and becomes visible below the yoke bushing.


On March 28, 1993, Wisconsin
According to the licensee, the keys failed in a brittle manner. The fractures


Public Service Corporation, the licensee for Kewaunee Nuclear Power Plant, reported that during motor-operated
began on either side of the key at the sharp radius of the inside corner of


valve (MOV)dynamic testing on March 27, 1993, one of two redundant
the L-shaped key and propagated into the body of the key. Machining of the


safety injection recirculation
sharp inside corner of the L-shaped key may have contributed to the failure of


valves to the refueling
the anti-rotation keys by producing high stresses in the corner of the keys.


water storage tank failed to close completely.
It is likely that the rotational action of the valve stem impacted on both


Investigation
sides of the key, exceeding the impact strength of the material at the sharp


revealed that the anti-rotation
radius of the key.


device, an L-shaped key between the valve stem and the yoke bushing (Attachment
9306030147        POR SIE Wr;c-c 913o0&i                              93o0wt


1), had broken.The shorter part of the broken L-shaped key had apparently
41      'C1301q3                      in    le- //                A


worked its way toward the valve stem and had jammed the valve stem, preventing
IN 93-42 June 9, 1993 In 1990, at the Maine Yankee Atomic Power Station, anti-rotation


closing. The valve that failed was a 2-inch bonnetless
4-inch MOVs manufactured by Velan failed. Maine Yankee                      keys in


globe valve manufactured
the licensee, discovered that spare keys supplied by          Atomic    Power    Company, valves were not of the proper hardness; they were RockwellVelan    for  several    of the


by Velan Valve Corp. The licensee inspected
harder Rockwell C-59 as originally specified. Valves              C-20  instead    of the


all nine similar motor-operated
wrong anti-rotation keys installed were disassembled,      that    may  have  had  the


valves and found that six had broken anti-rotation
replaced the Rockwell C-20 keys with keys made of the and the licensee


keys. The inspections
non-conforming keys that were removed showed signs        correct material. The


were visual and did not require disassembly
During post-maintenance testing, several of the new  of  significant wear.


of the motor-operated
the corner of the 'L" shape. This happened because      (hardened)      keys broke at


valve. Failures usually can be observed on normally closed valves, since the broken long leg of the L-shaped key slides down partially
the


and becomes visible below the yoke bushing.According
adaptor plate was too tight considering the service-related  keyway    in the valve


to the licensee, the keys failed in a brittle manner. The fractures began on either side of the key at the sharp radius of the inside corner of the L-shaped key and propagated
occurred to the rest of the keyway. Maine Yankee engineers          wear  that had


into the body of the key. Machining
larger keyways should be cut in the adaptor plate to                specified      that new


of the sharp inside corner of the L-shaped key may have contributed
breaking when the valve is actuated. The licensee        prevent    the   key   from


to the failure of the anti-rotation
valves and then tested the valves to ensure that they repaired all the affected


keys by producing
operated satisfactorily.


high stresses in the corner of the keys.It is likely that the rotational
Before testing MOYs at Prairie Island this past winter, globe valves also discovered anti-rotation key failures an inspection of Velan


action of the valve stem impacted on both sides of the key, exceeding
in 16 valves) in similar systems. Because of the             (2 broken keys found


the impact strength of the material at the sharp radius of the key.9306030147 POR SIE Wr;c-c 913o0&i 93o0wt 41 ' C1301q3 in le- // A
location of the break on the


IN 93-42 June 9, 1993 In 1990, at the Maine Yankee Atomic Power Station, anti-rotation
anti-rotation key, and the length of the key and key


keys in 4-inch MOVs manufactured
Power Company, the licensee, believed that the broken slot, Northern States


by Velan failed. Maine Yankee Atomic Power Company, the licensee, discovered
still perform their intended function and that the         anti-rotation keys would


that spare keys supplied by Velan for several of the valves were not of the proper hardness;
short leg of the L-shaped key) would not interact    broken    piece (i.e., the
they were Rockwell C-20 instead of the harder Rockwell C-59 as originally


specified.
impede valve operation. This is at variance with    with    the  valve stem so as to


Valves that may have had the wrong anti-rotation
above. The licensee added a step to their generic  the   Kewaunee      event discussed


keys installed
procedure to inspect, clean, debur, and lubricate    actuator      replacement


were disassembled, and the licensee replaced the Rockwell C-20 keys with keys made of the correct material.
anti-rotation devices.


The non-conforming
Discussion


keys that were removed showed signs of significant
On April 5, 1993, Velan issued the attached (Attachment
 
wear.During post-maintenance
 
testing, several of the new (hardened)
keys broke at the corner of the 'L" shape. This happened because the keyway in the valve adaptor plate was too tight considering


the service-related
#SB-106. This bulletin recommends that the anti-rotation2) Service Bulletin


wear that had occurred to the rest of the keyway. Maine Yankee engineers
for possible wear which could result in failure and              keys be inspected


specified
given to replacing the keys at the earliest convenient  that    consideration        be


that new larger keyways should be cut in the adaptor plate to prevent the key from breaking when the valve is actuated.
keys, which have been supplied by Velan for the             time.     The  replacement


The licensee repaired all the affected valves and then tested the valves to ensure that they operated satisfactorily.
past 24 years, are made of


Before testing MOYs at Prairie Island this past winter, an inspection
material meeting American Iron and Steel Institute


of Velan globe valves also discovered
opposed to 440C stainless steel (440C SS). AISI      (AISI) 4140 alloy steel, as


anti-rotation
4140 is significantly tougher


key failures (2 broken keys found in 16 valves) in similar systems. Because of the location of the break on the anti-rotation
than 440C SS. According to Velan, the material was
 
key, and the length of the key and key slot, Northern States Power Company, the licensee, believed that the broken anti-rotation
 
keys would still perform their intended function and that the broken piece (i.e., the short leg of the L-shaped key) would not interact with the valve stem so as to impede valve operation.
 
This is at variance with the Kewaunee event discussed above. The licensee added a step to their generic actuator replacement
 
procedure
 
to inspect, clean, debur, and lubricate
 
anti-rotation
 
devices.Discussion
 
On April 5, 1993, Velan issued the attached (Attachment


2) Service Bulletin#SB-106. This bulletin recommends
4140 is easier to procure and to heat treat properly.   changed to 4140 because


that the anti-rotation
this bulletin to all U.S. nuclear utilities. On              Velan plans to send


keys be inspected for possible wear which could result in failure and that consideration
between the NRC staff and Velan subsequent to the  the  basis    of conversations


be given to replacing
and because of the hardness of anti-rotation keys    issuance      of  the bulletin, made


the keys at the earliest convenient
suggests that both the keys and the keyways be inspected    out    of  440C  SS, Velan


time. The replacement
deterioration. The experience cited above indicates            for    damage    and


keys, which have been supplied by Velan for the past 24 years, are made of material meeting American Iron and Steel Institute (AISI) 4140 alloy steel, as opposed to 440C stainless
material in anti-rotation keys can lead to failures,     that    the   use  of brittle


steel (440C SS). AISI 4140 is significantly
may not always be impaired.                               although      valve  operation


tougher than 440C SS. According
_    a


to Velan, the material was changed to 4140 because 4140 is easier to procure and to heat treat properly.
IN 93-42 June 9, 1993 This information notice requires no specific action or written response. If


Velan plans to send this bulletin to all U.S. nuclear utilities.
you have any questions about the information in this notice, please contact


===On the basis of conversations===
the technical contact listed below or the appropriate Office of Nuclear
between the NRC staff and Velan subsequent


to the issuance of the bulletin, and because of the hardness of anti-rotation
Reactor Regulation (NRR) project manager.


keys made out of 440C SS, Velan suggests that both the keys and the keyways be inspected
Brian K. Grimes, Director


for damage and deterioration.
Division of Operating Reactor Support


The experience
Office of Nuclear Reactor Regulation


cited above indicates
Technical contact:  David C. Fischer, NRR


that the use of brittle material in anti-rotation
(301) 504-2728 Attachments: ('                      w      )
1. Figure 1, Velan Valve and Anti-Rotation Key


keys can lead to failures, although valve operation may not always be impaired._ a
2. Velan Service Bulletin #SB-106
3. List of Recently Issued NRC Information Notices


IN 93-42 June 9, 1993 This information
N-
                                              Attachment 1 IN 93-42 June 9, 1993 VELAN VALVE AND ANTI-ROTATION KEY


notice requires no specific action or written response.
STEM,
        11/X_ 5 ACME-2G-L.H.


If you have any questions
PITCH: .200
        LEAD: .200                                      BUSHING


about the information
KEYWAY


in this notice, please contact the technical
VALVE.,
                            BUSHING


contact listed below or the appropriate
STEM


Office of Nuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, Director Division of Operating
Attachment 2
                                    -_                    IN 93-42 June 9, 1993 _,VEAS


===Reactor Support Office of Nuclear Reactor Regulation===
- SERVICE BUlll              ~-                I#SB-1 i
Technical


contact: David C. Fischer, NRR (301) 504-2728 Attachments:
SUBJECT:-GLOBE VALVE STEM ANTROAIIO          KEY
(' w )1. Figure 1, Velan Valve and Anti-Rotation


Key 2. Velan Service Bulletin #SB-106 3. List of Recently Issued NRC Information
This is to advise you that an "LI shaped, globe valve stem anti- rotation key failed at Kewaunee Nuclear Plant. The valve in question


Notices
is a 2; Motor operated globe valve originally supplied to drawing


N-Attachment
137.116/1.


1 IN 93-42 June 9, 1993 VELAN VALVE AND ANTI-ROTATION
The valves affected are those Motor Operated Globe valves requiring a


KEY STEM, 1 1/X_ 5 ACME-2G-L.H.
key installed in mounting flange which prevents the stem from


PITCH: .200 LEAD: .200 BUSHING KEYWAY VALVE., BUSHING STEM
rotating. Globe valves which have been supplied with torque arms are


Attachment
not affected by this failure.


2-_ IN 93-42 June 9, 1993 _,VEAS-SERVICE BUlll ~- I#SB-1 i SUBJECT:-GLOBE
Based on the incident at Kewaunee Nuclear Plant we recommend that keys


VALVE STEM ANTROAIIO
be inspected for possible wear which could result in failure.


KEY This is to advise you that an "LI shaped, globe valve rotation key failed at Kewaunee Nuclear Plant. The valve is a 2; Motor operated globe valve originally
Consideration should also be given to replacing keys at your earliest


supplied 137.116/1.
possible convenience with new keys.        These new keys are supplied in


stem anti-in question to drawing The valves affected are those Motor Operated Globe valves requiring
material meeting AISI 4140. This material replaces the 440C grade


a key installed
which several project drawings call up.


in mounting flange which prevents the stem from rotating.
Replacement keys which have been supplied by us during the last 2 1/2 years have been from this new material. If these have been installed, only regular periodic verification will be required. If no inspection


Globe valves which have been supplied with torque arms are not affected by this failure.Based on the incident at Kewaunee Nuclear Plant we recommend
and or replacements has been made, we recommend that key. be replaced.


that keys be inspected
For additional information or replacement keys, please contact:
                          Velan valve Corp.


for possible wear which could result in failure.Consideration
550 McArthur


should also be given to replacing
Montreal, Quebec


keys at your earliest possible convenience
H4T 1X8 Attn t Nuclear Division


with new keys. These new keys are supplied in material meeting AISI 4140. This material replaces the 440C grade which several project drawings call up.Replacement
Phone: 514-748-7743 Pax s 514-342-2311 Nilaeon


keys which have been supplied by us during the last 2 1/2 years have been from this new material.
Ic -  esident, Quality Assurance              Manager, nuclear Division


If these have been installed, only regular periodic verification
-      p--v..


will be required.
pa--.


===If no inspection===
1  of 1  I
and or replacements


has been made, we recommend
0
I'Tiril 5f 1993    By


that key. be replaced.For additional
l


information
My:  .I. Francois


or replacement
3.1. Francois  Ilew      0o        1"..    1 of 1 I


keys, please contact: Velan valve Corp.550 McArthur Montreal, Quebec H4T 1X8 Attn t Nuclear Division Phone: 514-748-7743 Pax s 514-342-2311 Ic -esident, Quality Assurance Nilaeon Manager, nuclear Division-pa--. I p--v..My: 3.1. Francois 0 1 of 1 I'Tiril 5f 1993 By l .I. Francois Ilew 0o 1"..1 of 1 I
'-I


'-I Attachment
Attachment 3 IN 93-42 June 9, 1993 Page l'of I


3 IN 93-42 June 9, 1993 Page l'of I LIST OF RECENTLY ISSUED NRC INFORMATION
LIST OF RECENTLY ISSUED


NOTICES Information
NRC INFORMATION NOTICES


Date of Notice No. Subject Issuance Issued to 93-41 93-40 93-39 93-38 93-37 93-36 93-35 93-34, Supp. 1 One Hour Fire Endurance Test Results for Thermal Ceramics Kaowool, 3M Company FS-195 and 3M Company Interam E-50 Barrier Systems Fire Endurance
Information                                  Date of


Test Results for Thermal Ceramics FP-60 Fire Barrier Material Radiation
Notice No.            Subject                Issuance    Issued to


Beams from Power Reactor Biolog-ical Shields Inadequate
93-41          One Hour Fire Endurance        05/28/93    All holders of OLs or CPs


Testing of Engineered
Test Results for Thermal                    for nuclear power reactors.


Safety Features Actuation System Eyebolts with Indeter-minate Properties
Ceramics Kaowool, 3M


In-stalled in Limitorque
Company FS-195 and


Valve Operator Housing Covers Notifications, Reports, and Records of Misadmin-istrations
3M Company Interam E-50
                Barrier Systems


Insights from Common-Cause Failure Events Potential
93-40          Fire Endurance Test            05/26/93    All holders of OLs or CPs


for Loss of Emergency
Results for Thermal                        for nuclear power reactors.


Cooling Function Due to A Combination
Ceramics FP-60 Fire


of Operational
Barrier Material


and Post-Loca Debris in Contain-ment 05/28/93 05/26/93 05/25/93 05/24/93 05/19/93 05/07/93 05/12/93 05/06/93 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 holders of OLs or CPs for nuclear power reactors.All holders of OLs or CPs for nuclear power reactors.All U.S. Nuclear Regulatory
93-39          Radiation Beams from          05/25/93   All holders of OLs or CPs


Commission
Power Reactor Biolog-                      for nuclear power reactors.


medical licensees.
ical Shields


All holders of OLs or CPs for nuclear power plants (NPPs).All holders of OLs or CPs for nuclear power reactors.OL = Operating
93-38          Inadequate Testing of         05/24/93    All holders of OLs or CPs


License CP = Construction
Engineered Safety                          for nuclear power reactors.


Permit
Features Actuation


IN 93-42 June 9, 1993 This information
System


notice requires no specific action or written response.
93-37          Eyebolts with Indeter-        05/19/93    All holders of OLs or CPs


If you have any questions
minate Properties In-                      for nuclear power reactors.


about the information
stalled in Limitorque


in this notice, please contact the technical
Valve Operator Housing


contact listed below or the appropriate
Covers


Office of Nuclear Reactor Regulation (NRR) project manager.Original signed by Brian K. Grimes Brian K. Grimes, Director Division of Operating
93-36          Notifications, Reports,        05/07/93    All U.S. Nuclear Regulatory


===Reactor Support Office of Nuclear Reactor Regulation===
and Records of Misadmin-                    Commission medical
Technical


contact: David C. Fischer, NRR (301) 504-2728 Attachments:
istrations                                  licensees.
1. Figure 1, Velan Valve and Anti-Rotation


Key 2. Velan Service Bulletin #SB-106 3. List of Recently Issued NRC Information
93-35          Insights from Common-          05/12/93    All holders of OLs or CPs


Notices*See previous concurrence
Cause Failure Events                        for nuclear power plants


sheet*EMEB:DE:NRR
(NPPs).


DCFischer 4/15/93*C/EMCB:DE:NRR
93-34,        Potential for Loss of          05/06/93   All holders of OLs or CPs


===JRStrosnider===
Supp. 1        Emergency Cooling                          for nuclear power reactors.
4/20/93*OGCB:DORS:NRR


RJKiessel 05/03/93*SC/EMEB:DE:NRR
Function Due to A


EJSullivan
Combination of


4/16/93*C/RVIB:DRIL
Operational and Post- Loca Debris in Contain- ment


LJNorrholm
OL = Operating License


4/20/93*C/OGCB:DORS:NRR
CP = Construction Permit


GHMarcus 05/12/93*RPB:ADM TechEd 4/15/93*C/EMEB:DE:NRR
IN 93-42 June 9, 1993 This information notice requires no specific action or written response. If


JANorberg 4/19/93*D/DE:NRR JERichardson
you have any questions about the information in this notice, please contact


4/23/93 I0*DRS:RIII GCWright 4/21J.3 II /93 DOCUMENT NAME: 93-42.IN
the technical contact listed below or the appropriate Office of Nuclear


IN 93-XX April 22, 1993 Even though a broken anti-rotation
Reactor Regulation (NRR) project manager.


key does not always impair valve operation, it is a concern to the NRC that anti-rotation
Original signed by


keys made of such brittle material (440C SS) are used in safety-related
Brian K. Grimes


valves.This information
Brian K. Grimes, Director


notice requires no specific action or written response.
Division of Operating Reactor Support


If you have any questions
Office of Nuclear Reactor Regulation


about the information
Technical contact:  David C. Fischer, NRR


in this notice, please contact the technical
(301) 504-2728 Attachments:
1. Figure 1, Velan Valve and Anti-Rotation Key


contact listed below or the appropriate
2. Velan Service Bulletin #SB-106
3. List of Recently Issued NRC Information Notices


Office of Nuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, Director Division of Operating
*See previous concurrence sheet


===Reactor Support Office of Nuclear Reactor Regulation===
*EMEB:DE:NRR      *SC/EMEB:DE:NRR    *RPB:ADM              *C/EMEB:DE:NRR
Technical


contact: David C. Fischer, NRR (301) 504-2728 Attachments:
DCFischer        EJSullivan        TechEd                JANorberg
1. Figure 1, Velan Valve and Anti-Rotation


Key 2. Velan Service Bulletin #SB-106 3. List of Recently Issued NRC Information
4/15/93          4/16/93            4/15/93                4/19/93 I0
*C/EMCB:DE:NRR    *C/RVIB:DRIL      *DRS:RIII              *D/DE:NRR


Notices Document Name:*See previous concurrence
JRStrosnider      LJNorrholm        GCWright              JERichardson


sheet*EMEB:DE:NRR
4/20/93          4/20/93            4/21J.3                4/23/93
*OGCB:DORS:NRR    *C/OGCB:DORS:NRR


DCFischer 4/15/93*SC/EMEB:DE:NRR
RJKiessel        GHMarcus


EJSullivan
05/03/93          05/12/93            II /93 DOCUMENT NAME:  93-42.IN


4/16/93*RPB:ADM TechEd 4/15/93*C/EMEB:DE:NRR
IN 93-XX


JANorberg 4/19/93*C/EMCB:DE:NRR
April 22, 1993 Even though a broken anti-rotation key does not always impair valve operation, it is a concern to the NRC that anti-rotation keys made of such brittle


===JRStrosnider===
material (440C SS) are used in safety-related valves.
4/20/93*C/RVIB:DRIL


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


4/20/93*DRS:RIII GCWright 4/21/93*D/DE:NRR JERichardson
you have any questions about the information in this notice, please contact


4/23/93 OGCB:DORS:NRR
the technical contact listed below or the appropriate Office of Nuclear


RJKiessel/ /93 C/OGCB:DORS:NRR
Reactor Regulation (NRR) project manager.


===GHMarcusHkiM===
Brian K. Grimes, Director
f /taL/93 D/DORS:NRR


r BKGrimes -/ /93 u
Division of Operating Reactor Support


IN 93-XX April 22, 1993 Even though a broken anti-rotation
Office of Nuclear Reactor Regulation


key does not always impair valve operation, it is a concern to the NRC that anti-rotation
Technical contact:    David C. Fischer, NRR


keys 'made of such brittle material (440C SS) are used in so many safety-related
(301) 504-2728 Attachments:
      1.    Figure 1, Velan Valve and Anti-Rotation Key


valves.This information
2.     Velan Service Bulletin #SB-106
      3.    List of Recently Issued NRC Information Notices


notice requires no specific action or written response.
Document Name:
      *See previous concurrence sheet


If you have any questions
*EMEB:DE:NRR      *SC/EMEB:DE:NRR    *RPB:ADM          *C/EMEB:DE:NRR


about the information
DCFischer          EJSullivan        TechEd            JANorberg


in this notice, please contact the technical
4/15/93            4/16/93            4/15/93          4/19/93
*C/EMCB:DE:NRR    *C/RVIB:DRIL        *DRS:RIII        *D/DE:NRR


contact listed below or the appropriate
JRStrosnider      LJNorrholm          GCWright        JERichardson


Office of Nuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, Director Division of Operating
4/20/93            4/20/93            4/21/93          4/23/93 OGCB:DORS:NRR     C/OGCB:DORS:NRR    D/DORS:NRR r


===Reactor Support Office of Nuclear Reactor Regulation===
RJKiessel          GHMarcusHkiM        BKGrimes -
Technical
  / /93            f /taL/93            / /93 u


contact: David C. Fischer, NRR (301) 504-2728 Attachments:
IN 93-XX
1. Figure 1, Velan Valve and Anti-Rotation


Key 2. Velan Service Bulletin #SB-106 3. List of Recently Issued NRC Information
April 22, 1993 Even though a broken anti-rotation key does not always impair valve operation, it is a concern to the NRC that anti-rotation keys 'made of such brittle


Notices Document Name:*See previous concurrence
material (440C SS) are used in so many safety-related valves.


sheet*EMEB:DE:NRR
This information notice requires no specific action or written response. If


DCFischer 4/15/93*SC/EMEB:DE:NRR
you have any questions about the information in this notice, please contact


EJSullivan
the technical contact listed below or the appropriate Office of Nuclear


4/16/93*RPB:ADM TechEd 4/15/93*C/EMEB:DE:NRR
Reactor Regulation (NRR) project manager.


JANorberg 4/19/93*C/EMCB:DE:NRR
Brian K. Grimes, Director


===JRStrosnider===
Division of Operating Reactor Support
4/20/93*C/RVIB:DRIL


LJNorrholm
Office of Nuclear Reactor Regulation


4/20/93*DRS:RIII GCWright 4/21/93*D/DE:NRR JERichardson
Technical contact:   David C. Fischer, NRR


4/23/93 OGCB:DORS:NRR
(301) 504-2728 Attachments:
      1.    Figure 1, Velan Valve and Anti-Rotation Key


RJKiessel/ /93 C/OGCB:DORS:NRR
2.    Velan Service Bulletin #SB-106
      3.    List of Recently Issued NRC Information Notices


GHMarcus/ /93 D/DORS:NRR
Document Name:
      *See previous concurrence sheet


BKGrimes/ /93
*EMEB:DE:NRR      *SC/EMEB:DE:NRR    *RPB:ADM          *C/EMEB:DE:NRR
114r IN 93-XX-Paige3, 1993 hardness of anti-rotation


keys made out of 440C SS, Velan suggests that both the keys and the keyways be inspected
DCFischer          EJSullivan        TechEd            JANorberg


for damage and deterioration.
4/15/93            4/16/93            4/15/93          4/19/93
*C/EMCB:DE:NRR    *C/RVIB:DRIL      *DRS:RIII        *D/DE:NRR


Even though a broken anti-rotation
JRStrosnider      LJNorrholm        GCWright          JERichardson


key does not always impair valve operation, it is a concern to the NRC that anti-rotation
4/20/93            4/20/93            4/21/93          4/23/93 OGCB:DORS:NRR      C/OGCB:DORS:NRR    D/DORS:NRR


keys made of such brittle material (440C SS) are used in so many safety-related
===RJKiessel          GHMarcus          BKGrimes===
  / /93              / /93              / /93


valves.This information
IN 93-XX


notice requires no specific action or written response.
114r    -Paige3,  1993 hardness of anti-rotation keys made out of 440C SS, Velan suggests that both


If you have any questions
the keys and the keyways be inspected for damage and deterioration.


about the information
Even though a broken anti-rotation key does not always impair valve operation, it is a concern to the NRC that anti-rotation keys made of such brittle


in this notice, please contact the technical
material (440C SS) are used in so many safety-related valves.


contact listed below or the appropriate
This information notice requires no specific action or written response. If


Office of Nuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, Director Division of Operating
you have any questions about the information in this notice, please contact


===Reactor Support Office of Nuclear Reactor Regulation===
the technical contact listed below or the appropriate Office of Nuclear
Technical


contact: David C. Fischer, NRR (301) 504-2728 Attachments:
Reactor Regulation (NRR) project manager.
1. Figure 1, Velan Valve and Anti-Rotation


Key 2. Velan Service Bulletin #SB-106 3. List of Recently Issued NRC Information
Brian K. Grimes, Director


Notices Document Name:*See previous concurrence
Division of Operating Reactor Support


sheet*EMEB:DE:NRR
Office of Nuclear Reactor Regulation


DCFischer 4/15/93*SC/EMEB:DE:NRR
Technical contact:   David C. Fischer, NRR


EJSullivan
(301) 504-2728 Attachments:
      1.    Figure 1, Velan Valve and Anti-Rotation Key


4/16/93*RPB:ADM TechEd 4/15/93*C/EMEB:DE:NRR
2.    Velan Service Bulletin #SB-106
      3.    List of Recently Issued NRC Information Notices


JANorberg 4/19/93*C/EMCB:DE:NRR
Document Name:
      *See previous concurrence sheet


===JRStrosnider===
*EMEB:DE:NRR      *SC/EMEB:DE:NRR  *RPB:ADM          *C/EMEB:DE:NRR
4/20/93*C/RVIB:DRIL


LJNorrholm
DCFischer          EJSullivan        TechEd            JANorberg


4/20/93*DRS:RIII GCWright 4/21/93*D/DE:NRR JERichardson
4/15/93           4/16/93          4/15/93          4/19/93
*C/EMCB:DE:NRR    *C/RVIB:DRIL      *DRS:RIII         *D/DE:NRR


4/23/93 OGCB:DORS:NRR4, RJKiessel g/gJ/93 MQ<C/OGCB:DORS:NRR
JRStrosnider      LJNorrholm        GCWright          JERichardson


GHMarcus/ /93 D/DORS:NRR
4/20/93           4/20/93          4/21/93          4/23/93 OGCB:DORS:NRR4,    C/OGCB:DORS:NRR  D/DORS:NRR


BKGrimes/ /93 Document Name:G:\FISCHER\VELAN.IN
===RJKiessel          GHMarcus          BKGrimes===
g/gJ/93 MQ<          / /93            / /93


EMEB:DE:NRR
Document Name:G:\FISCHER\VELAN.IN  CDoo  t1-1 1I.c"641 Ott FRv


8 :NRR DCFischer
EMEB:DE:NRR    8         :NRR       RPB:ADM                  C:& rgRR


EJSe 1yn 9 /ir/93 4/l /CDoo t1-1 1I.c"641 Ott FRv RPB:ADM TechEd V /f/93 lee OmIL A/ /3 IDRS :R I I I'346s GCWright 4 /'i /93 C:& rgRR D: DE: NRR JERichard
===DCFischer      EJSe 1yn             TechEd===
9/ir/93       4/l /                 V/f/93 IDRS :R III'346s         D: DE: NRR


n t/N~3/93 OGCB:DORS:NRR
lee  OmIL    GCWright                JERichard  n


RJKiessel/ /93 C/OGCB:DORS:NRR
A/ /3        4 /'i/93                  t/N~3/93 OGCB:DORS:NRR      C/OGCB:DORS:NRR          D/DORS:NRR


GHMarcus/ /93 D/DORS:NRR
RJKiessel          GHMarcus                 BKGrimes


BKGrimes/ /93}}
/ /93                / /93                      / /93}}


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

Latest revision as of 04:20, 24 November 2019

Failure of Anti-Rotation Keys in Motor-Operated Valves Manufactured by Yelan
ML031070501
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: 06/09/1993
From: Grimes B
Office of Nuclear Reactor Regulation
To:
References
IN-93-042, NUDOCS 9306030147
Download: ML031070501 (12)
v • d • e


"-

UNITED STATES

NUCLEAR REGULATORY COMMISSION

OFFICE OF NUCLEAR REACTOR REGULATION

WASHINGTON, D.C. 20555 June 9, 1993 NRC INFORMATION NOTICE 93-42: FAILURE OF ANTI-ROTATION KEYS IN MOTOR-OPERATED

VALVES MANUFACTURED BY VELAN

Addressees

All holders of operating licenses or construction permits for nuclear power

reactors.

Purpose

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

notice to alert addressees to potential problems resulting from the failure

anti-rotation keys in motor-operated globe valves manufactured by Velan forValve

Corporation. It is expected that recipients will review the information to

applicability to their facilities and consider actions, as appropriate, avoid similar problems. However, suggestions contained in this information or

notice do not constitute NRC requirements; therefore, no specific action

written response is required.

Description of Circumstances

On March 28, 1993, Wisconsin Public Service Corporation, the licensee for

Kewaunee Nuclear Power Plant, reported that during motor-operated valve (MOV)

dynamic testing on March 27, 1993, one of two redundant safety injection

recirculation valves to the refueling water storage tank failed to close

completely. Investigation revealed that the anti-rotation device, an L-shaped

key between the valve stem and the yoke bushing (Attachment 1), had broken.

The shorter part of the broken L-shaped key had apparently worked its way The

toward the valve stem and had jammed the valve stem, preventing closing.

valve that failed was a 2-inch bonnetless globe valve manufactured by Velan and

Valve Corp. The licensee inspected all nine similar motor-operated valves and

found that six had broken anti-rotation keys. The inspections were visual can

did not require disassembly of the motor-operated valve. Failures usually

be observed on normally closed valves, since the broken long leg of the

L-shaped key slides down partially and becomes visible below the yoke bushing.

According to the licensee, the keys failed in a brittle manner. The fractures

began on either side of the key at the sharp radius of the inside corner of

the L-shaped key and propagated into the body of the key. Machining of the

sharp inside corner of the L-shaped key may have contributed to the failure of

the anti-rotation keys by producing high stresses in the corner of the keys.

It is likely that the rotational action of the valve stem impacted on both

sides of the key, exceeding the impact strength of the material at the sharp

radius of the key.

9306030147 POR SIE Wr;c-c 913o0&i 93o0wt

41 'C1301q3 in le- // A

IN 93-42 June 9, 1993 In 1990, at the Maine Yankee Atomic Power Station, anti-rotation

4-inch MOVs manufactured by Velan failed. Maine Yankee keys in

the licensee, discovered that spare keys supplied by Atomic Power Company, valves were not of the proper hardness; they were RockwellVelan for several of the

harder Rockwell C-59 as originally specified. Valves C-20 instead of the

wrong anti-rotation keys installed were disassembled, that may have had the

replaced the Rockwell C-20 keys with keys made of the and the licensee

non-conforming keys that were removed showed signs correct material. The

During post-maintenance testing, several of the new of significant wear.

the corner of the 'L" shape. This happened because (hardened) keys broke at

the

adaptor plate was too tight considering the service-related keyway in the valve

occurred to the rest of the keyway. Maine Yankee engineers wear that had

larger keyways should be cut in the adaptor plate to specified that new

breaking when the valve is actuated. The licensee prevent the key from

valves and then tested the valves to ensure that they repaired all the affected

operated satisfactorily.

Before testing MOYs at Prairie Island this past winter, globe valves also discovered anti-rotation key failures an inspection of Velan

in 16 valves) in similar systems. Because of the (2 broken keys found

location of the break on the

anti-rotation key, and the length of the key and key

Power Company, the licensee, believed that the broken slot, Northern States

still perform their intended function and that the anti-rotation keys would

short leg of the L-shaped key) would not interact broken piece (i.e., the

impede valve operation. This is at variance with with the valve stem so as to

above. The licensee added a step to their generic the Kewaunee event discussed

procedure to inspect, clean, debur, and lubricate actuator replacement

anti-rotation devices.

Discussion

On April 5, 1993, Velan issued the attached (Attachment

  1. SB-106. This bulletin recommends that the anti-rotation2) Service Bulletin

for possible wear which could result in failure and keys be inspected

given to replacing the keys at the earliest convenient that consideration be

keys, which have been supplied by Velan for the time. The replacement

past 24 years, are made of

material meeting American Iron and Steel Institute

opposed to 440C stainless steel (440C SS). AISI (AISI) 4140 alloy steel, as

4140 is significantly tougher

than 440C SS. According to Velan, the material was

4140 is easier to procure and to heat treat properly. changed to 4140 because

this bulletin to all U.S. nuclear utilities. On Velan plans to send

between the NRC staff and Velan subsequent to the the basis of conversations

and because of the hardness of anti-rotation keys issuance of the bulletin, made

suggests that both the keys and the keyways be inspected out of 440C SS, Velan

deterioration. The experience cited above indicates for damage and

material in anti-rotation keys can lead to failures, that the use of brittle

may not always be impaired. although valve operation

_ a

IN 93-42 June 9, 1993 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: David C. Fischer, NRR

(301) 504-2728 Attachments: (' w )

1. Figure 1, Velan Valve and Anti-Rotation Key

2. Velan Service Bulletin #SB-106

3. List of Recently Issued NRC Information Notices

N-

Attachment 1 IN 93-42 June 9, 1993 VELAN VALVE AND ANTI-ROTATION KEY

STEM,

11/X_ 5 ACME-2G-L.H.

PITCH: .200

LEAD: .200 BUSHING

KEYWAY

VALVE.,

BUSHING

STEM

Attachment 2

-_ IN 93-42 June 9, 1993 _,VEAS

- SERVICE BUlll ~- I#SB-1 i

SUBJECT:-GLOBE VALVE STEM ANTROAIIO KEY

This is to advise you that an "LI shaped, globe valve stem anti- rotation key failed at Kewaunee Nuclear Plant. The valve in question

is a 2; Motor operated globe valve originally supplied to drawing

137.116/1.

The valves affected are those Motor Operated Globe valves requiring a

key installed in mounting flange which prevents the stem from

rotating. Globe valves which have been supplied with torque arms are

not affected by this failure.

Based on the incident at Kewaunee Nuclear Plant we recommend that keys

be inspected for possible wear which could result in failure.

Consideration should also be given to replacing keys at your earliest

possible convenience with new keys. These new keys are supplied in

material meeting AISI 4140. This material replaces the 440C grade

which several project drawings call up.

Replacement keys which have been supplied by us during the last 2 1/2 years have been from this new material. If these have been installed, only regular periodic verification will be required. If no inspection

and or replacements has been made, we recommend that key. be replaced.

For additional information or replacement keys, please contact:

Velan valve Corp.

550 McArthur

Montreal, Quebec

H4T 1X8 Attn t Nuclear Division

Phone: 514-748-7743 Pax s 514-342-2311 Nilaeon

Ic - esident, Quality Assurance Manager, nuclear Division

- p--v..

pa--.

1 of 1 I

0

I'Tiril 5f 1993 By

l

My: .I. Francois

3.1. Francois Ilew 0o 1".. 1 of 1 I

'-I

Attachment 3 IN 93-42 June 9, 1993 Page l'of I

LIST OF RECENTLY ISSUED

NRC INFORMATION NOTICES

Information Date of

Notice No. Subject Issuance Issued to

93-41 One Hour Fire Endurance 05/28/93 All holders of OLs or CPs

Test Results for Thermal for nuclear power reactors.

Ceramics Kaowool, 3M

Company FS-195 and

3M Company Interam E-50

Barrier Systems

93-40 Fire Endurance Test 05/26/93 All holders of OLs or CPs

Results for Thermal for nuclear power reactors.

Ceramics FP-60 Fire

Barrier Material

93-39 Radiation Beams from 05/25/93 All holders of OLs or CPs

Power Reactor Biolog- for nuclear power reactors.

ical Shields

93-38 Inadequate Testing of 05/24/93 All holders of OLs or CPs

Engineered Safety for nuclear power reactors.

Features Actuation

System

93-37 Eyebolts with Indeter- 05/19/93 All holders of OLs or CPs

minate Properties In- for nuclear power reactors.

stalled in Limitorque

Valve Operator Housing

Covers

93-36 Notifications, Reports, 05/07/93 All U.S. Nuclear Regulatory

and Records of Misadmin- Commission medical

istrations licensees.

93-35 Insights from Common- 05/12/93 All holders of OLs or CPs

Cause Failure Events for nuclear power plants

(NPPs).

93-34, Potential for Loss of 05/06/93 All holders of OLs or CPs

Supp. 1 Emergency Cooling for nuclear power reactors.

Function Due to A

Combination of

Operational and Post- Loca Debris in Contain- ment

OL = Operating License

CP = Construction Permit

IN 93-42 June 9, 1993 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.

Original signed by

Brian K. Grimes

Brian K. Grimes, Director

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical contact: David C. Fischer, NRR

(301) 504-2728 Attachments:

1. Figure 1, Velan Valve and Anti-Rotation Key

2. Velan Service Bulletin #SB-106

3. List of Recently Issued NRC Information Notices

  • See previous concurrence sheet
  • EMEB:DE:NRR *SC/EMEB:DE:NRR *RPB:ADM *C/EMEB:DE:NRR

DCFischer EJSullivan TechEd JANorberg

4/15/93 4/16/93 4/15/93 4/19/93 I0

  • C/EMCB:DE:NRR *C/RVIB:DRIL *DRS:RIII *D/DE:NRR

JRStrosnider LJNorrholm GCWright JERichardson

4/20/93 4/20/93 4/21J.3 4/23/93

  • OGCB:DORS:NRR *C/OGCB:DORS:NRR

RJKiessel GHMarcus

05/03/93 05/12/93 II /93 DOCUMENT NAME: 93-42.IN

IN 93-XX

April 22, 1993 Even though a broken anti-rotation key does not always impair valve operation, it is a concern to the NRC that anti-rotation keys made of such brittle

material (440C SS) are used in safety-related valves.

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: David C. Fischer, NRR

(301) 504-2728 Attachments:

1. Figure 1, Velan Valve and Anti-Rotation Key

2. Velan Service Bulletin #SB-106

3. List of Recently Issued NRC Information Notices

Document Name:

  • See previous concurrence sheet
  • EMEB:DE:NRR *SC/EMEB:DE:NRR *RPB:ADM *C/EMEB:DE:NRR

DCFischer EJSullivan TechEd JANorberg

4/15/93 4/16/93 4/15/93 4/19/93

  • C/EMCB:DE:NRR *C/RVIB:DRIL *DRS:RIII *D/DE:NRR

JRStrosnider LJNorrholm GCWright JERichardson

4/20/93 4/20/93 4/21/93 4/23/93 OGCB:DORS:NRR C/OGCB:DORS:NRR D/DORS:NRR r

RJKiessel GHMarcusHkiM BKGrimes -

/ /93 f /taL/93 / /93 u

IN 93-XX

April 22, 1993 Even though a broken anti-rotation key does not always impair valve operation, it is a concern to the NRC that anti-rotation keys 'made of such brittle

material (440C SS) are used in so many safety-related valves.

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: David C. Fischer, NRR

(301) 504-2728 Attachments:

1. Figure 1, Velan Valve and Anti-Rotation Key

2. Velan Service Bulletin #SB-106

3. List of Recently Issued NRC Information Notices

Document Name:

  • See previous concurrence sheet
  • EMEB:DE:NRR *SC/EMEB:DE:NRR *RPB:ADM *C/EMEB:DE:NRR

DCFischer EJSullivan TechEd JANorberg

4/15/93 4/16/93 4/15/93 4/19/93

  • C/EMCB:DE:NRR *C/RVIB:DRIL *DRS:RIII *D/DE:NRR

JRStrosnider LJNorrholm GCWright JERichardson

4/20/93 4/20/93 4/21/93 4/23/93 OGCB:DORS:NRR C/OGCB:DORS:NRR D/DORS:NRR

RJKiessel GHMarcus BKGrimes

/ /93 / /93 / /93

IN 93-XX

114r -Paige3, 1993 hardness of anti-rotation keys made out of 440C SS, Velan suggests that both

the keys and the keyways be inspected for damage and deterioration.

Even though a broken anti-rotation key does not always impair valve operation, it is a concern to the NRC that anti-rotation keys made of such brittle

material (440C SS) are used in so many safety-related valves.

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: David C. Fischer, NRR

(301) 504-2728 Attachments:

1. Figure 1, Velan Valve and Anti-Rotation Key

2. Velan Service Bulletin #SB-106

3. List of Recently Issued NRC Information Notices

Document Name:

  • See previous concurrence sheet
  • EMEB:DE:NRR *SC/EMEB:DE:NRR *RPB:ADM *C/EMEB:DE:NRR

DCFischer EJSullivan TechEd JANorberg

4/15/93 4/16/93 4/15/93 4/19/93

  • C/EMCB:DE:NRR *C/RVIB:DRIL *DRS:RIII *D/DE:NRR

JRStrosnider LJNorrholm GCWright JERichardson

4/20/93 4/20/93 4/21/93 4/23/93 OGCB:DORS:NRR4, C/OGCB:DORS:NRR D/DORS:NRR

RJKiessel GHMarcus BKGrimes

g/gJ/93 MQ< / /93 / /93

Document Name:G:\FISCHER\VELAN.IN CDoo t1-1 1I.c"641 Ott FRv

EMEB:DE:NRR 8 :NRR RPB:ADM C:& rgRR

DCFischer EJSe 1yn TechEd

9/ir/93 4/l / V/f/93 IDRS :R III'346s D: DE: NRR

lee OmIL GCWright JERichard n

A/ /3 4 /'i/93 t/N~3/93 OGCB:DORS:NRR C/OGCB:DORS:NRR D/DORS:NRR

RJKiessel GHMarcus BKGrimes

/ /93 / /93 / /93


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