Information Notice 1993-37, Eyebolts with Indeterminate Properties Installed in Limitorque Valve Operator Housing Covers
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UNITED STATES
NUCLEAR REGULATORY COMMISSION
OFFICE OF NUCLEAR REACTOR REGULATION
WASHINGTON, D.C. 20555 May 19, 1993 NRC INFORMATION NOTICE 93-37: EYEBOLTS WITH INDETERMINATE PROPERTIES
INSTALLED IN LIMITORQUE VALVE OPERATOR
HOUSING COVERS
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
notice to alert addressees to problems that could result from eyebolts with
indeterminate properties installed in Limitorque valve operator housing
covers. It is expected that recipients will review the information for
applicability to their facilities and consider actions, as appropriate, to
avoid similar problems. However, suggestions contained in this information
notice are not NRC requirements; therefore, no specific action or written
response is required.
Description of Circumstances
During recent inspections at the Crystal River Nuclear Plant and the
Virgil C. Summer Nuclear Station, the NRC found Limitorque model SMB-O0O and
SMB-00 valve operators in which two of the housing cover bolts were replaced
with an eyebolt and nut combination. The licensees reviewed their design
change programs but did not find any documentation for the installation of the
eyebolts. The affected valve operators were installed in safety- and
nonsafety-related applications. Some of the affected valve operators were
installed on butterfly valves through a worm-drive gearbox such that the
housing cover bolts do not experience stem thrust during valve operation.
However, some of the affected safety-related valve operators were installed on
gate valves and globe valves such that the housing cover bolts do experience
stem thrust-forces during valve operation. The housing cover bolts transmit
valve stem thrust to the operator housing and ultimately to the valve yoke.
The bolts are listed as critical to valve operator function in the Limitorque
Critical Component List.
Discussion
South Carolina Electric and Gas (SCE&G), the licensee for Summer, determined
that the affected valve operators arrived from the Limitorque Corporation, the
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IN 93-37 May 19, 1993 valve operator vendor, with the eyebolts installed. In a letter
December 11, 1992, Limitorque confirmed that it had shipped valve to SCE&G of
with eyebolts installed since the early 1970s, that Limitorque operators
did
the eyebolt material, and that therefore it could not yet address not control
qualification of the eyebolt material for actuator operation. the
representatives stated that they had not received any reports Limitorque
associated with the eyebolts. Limitorque has issued Maintenance of failures
in which it discusses this problem in paragraph 9, and recommends Update 92-2, eyebolts be replaced by grade 5 housing cover bolts at the next that the
maintenance. scheduled
The NRC staff believes that ungraded eyebolts are probably installed
various safety-related applications at other facilities since in
was not previously documented by the vendor. The NRC has attachedthis condition
from the Limitorque Maintenance Update 92-2 because all licensees an excerpt
automatically receive Limitorque maintenance updates. may not
This information notice requires no specific action or written
you have any questions about the information in this notice, response. If
one of the technical contacts listed below or the appropriate please contact
Nuclear Reactor Regulation (NRR) project manager. Office of
Brian K. Grimes, Director
Division of Operating Reactor Support
Office of Nuclear Reactor Regulation
Technical contacts: Stephen Elrod, RII Richard Freudenberger, RII
(407) 464-7822 (904) 795-7677 Lee Keller, RII Thomas Scarbrough, NRR
(803) 345-5683 (301) 504-2794 Attachments:
1. Excerpt from Limitorque Maintenance Update 92-2
2. List of Recently Issued NRC Information Notices
Attachment 1 IN 93-37 May 19, 1993 Limitorque Corporation Maintenance Update 92-2
9. SMB.OOO/OO Evebolt Housing Cover Screws
Philadelphia Electric (Limerick) and South
Carolina Electric and Gas (V.C. Summer)
recently inquired about eyebolts that were
found in place of the housing cover bolts on
0
a number of SMB-OO and SMBOOr
actuators. V.C. Surmmer found that 2 of
the 4 housing cover bolts were replaced
with the evebolts. Limerick found that 3 of
the 6 housing cover bolts were replaced
with the eyebolts. The purpose of the
iJ
eyebolts was to provide a lifting lug for Standard Housf Speclal Housing
moving the actuator. The question inwolved Cover Hex Head GCvow Hex Head
the material grade of the eyebolts. The With Eyebolt for Ufftng
correct housing cover hex head bolt part FIgure 4-Eyebolt Housing Cover Screw
number is HB8-3/8-16x20 and is specified as
a grade S materiaL The housing cover bolts are considered critical in Llmitorque Critical
Component List since the bolts receive the resulting thrust load in the closing direction of
the valve.
Page 13
Attachnent 1 IN 93-37 May 19, 1993 I.Umitorque Corporation Maintenance Update 92-2 Iimitarque research could not determine the material of the eyebolts. In one case, records
could not confirm that the eyebolts were supplied by Limitorque.
Due to lack of traceability, Limitorque can only infer that the eyebolts were a heat treated
forged steel designed to handle the stresses of lifting the actuator.
Discussion with long term Liimitorque employees implies that the eyebolts may have been
supplied on a number of SMBMO0O and SMB-00 actuators-for commercial and nuclear
service. However, they could not have been supplied on SMB-00 actuators with side
mounted handwheels due to minimal clearance. Additionally, the eyebolt material is of no
concern for applications that the actuator does not withstand the resulting thrust in the
closi ig direction (i.e. quarter-turn applications and many reach-r'.d applications).
For gate and globe valve applications in which the actuator withstands thrust, the question
of the eye-bolt material in regards to actuator operation cannot be addressed without
uncertainty. However, it is Limitorque's opinion that the eyebolts would not require
immediate replacement for continued operation based on the following:
- The material of lifting lugs are designed to withstand the weight of the actuator, consequently the assumed allowable stress of the lugs is within the stresses imparted
on housing cover screws under normal operation.
- The standard grade 5 material of the housing cover bolts has a inherent safety
margin in relation to the Limitorque published thrust ratings of the 000/00
- It appears that 000/00 actuators supplied with eyebolts in place of the housing
cover bolts are only a portion of the total number of housing cover bolts.
- The fact that no reports of eyebolt failures of 000/00 actuators over what may be
a large population (commercial units included) implies that operational history
justifies continued use of the eyebolts.
Note that the above arguments are weakened when an SMB-000 or SMB-00 actuator has
experienced a stall condition above the Lmitorque published thrust rating of the actuator
(see Technical Update 92-02) or have operated at thrust values qualified by Kalsi extended
thrust testing (see Technical Update 92-01). In summary, Limitorque recommends that the
eyebolts found in place of the housing cover bolts be replaced by the grade 5 housing cover
bolts at the next scheduled maintenance. Figure #1-Eyebolt Housing Cover Screw shows
how the eyebolts can be identified. A visual inspection is the only known method for
identifying these cases It is assumed that a jam nut is separate from the eyebolt. This
discussion does not apply to eyebolts located on actuators other than in place of the housing
cover bolts (eyebolts have been supplied in other taps of the actuator housing).
Page 14
Attachment 2 IN 93-37 May 19, 1993 LIST OF RECENTLY ISSUED
NRC INFORMATION NOTICES
Information Date of
Notice No. Subject Issuance Issued to
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 04/06/93 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
93-34 Potential for Loss of 04/26/93 All holders of OLs or CPs
Emergency Cooling for nuclear power reactors.
Function Due to A
Combination of
Operational and Post- Loca Debris in Contain- ment
93-33 Potential Deficiency 04/28/93 All holders of OLs or CPs
of Certain Class IE for nuclear power reactors.
Instrumentation and
Control Cables
93-32 Nonconservative Inputs 04/21/93 All holders of OLs or CPs
for Boron Dilution for pressurized water
Event Analysis reactors (PWRs).
93-31 Training of Nurses 04/13/93 All U.S. Nuclear Regulatory
Responsible for the Commission medical
Care of Patients with licensees.
Brachytherapy Implants
OL = Operating License
CP = Construction Permit
-i
v IN 93-37 May 19, 1993 valve operator vendor, with the eyebolts installed. In a letter to SCE&G of
December 11, 1992, Limitorque confirmed that it had shipped valve operators
with eyebolts installed since the early 1970s, that Limitorque did not control
the eyebolt material, and that therefore it could not yet address the
qualification of the eyebolt material for actuator operation. Limitorque
representatives stated that they had not received any reports of failures
associated with the eyebolts. Limitorque has issued Maintenance Update 92-2, in which it discusses this problem in paragraph 9, and recommends that the
eyebolts be replaced by grade 5 housing cover bolts at the next scheduled
maintenance.
The NRC staff believes that ungraded eyebolts are probably installed in
various safety-related applications at other facilities since this condition
was not previously documented by the vendor. The NRC has attached an excerpt
from the Limitorque Maintenance Update 92-2 because all licensees may not
automatically receive Limitorque maintenance updates.
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 or the appropriate Office of
Nuclear Reactor Regulation (NRR) project manager.
Orginal igned by
Brian K. Grimes
Brian K. Grimes, Director
Division of Operating Reactor Support
Office of Nuclear Reactor Regulation
Technical contacts: Stephen Elrod, RII Richard Freudenberger, RII
(407) 464-7822 (904) 795-7677 Lee Keller, RII Thomas Scarbrough, NRR
(803) 345-5683 (301) 504-2794 Attachments:
1. Excerpt from Limitorque Maintenance Update 92-2
2. List of Recently Issued NRC Information Notices
- SEE PREVIOUS CONCURRENCES
DOC NAME: 93-37.IN
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02/25/93 03/02/93 03/03/93 03/18/93 03/02/93
- ' x IN 93-XX
April XX, 1993 valve operator vendor, with the eyebolts installed. In a letter to SCE&G of
December 11, 1992, Limitorque confirmed that it had shipped valve operators
with eyebolts installed since the early 1970s, that Limitorque did not control
the eyebolt material, and that therefore it could not yet address the
qualification of the eyebolt material for actuator operation. Limitorque
representatives stated that they had not received any reports of failures
associated with the eyebolts. Limitorque has issued Maintenance Update 92-2, in which it discusses this problem in paragraph 9, and recommends that the
eyebolts be replaced by grade 5 housing cover bolts at the next scheduled
maintenance.
The NRC staff believes that ungraded eyebolts are probably installed in
various safety-related applications at other facilities since this condition
was not previously documented by the vendor. The NRC has attached an excerpt
from the Limitorque Maintenance Update 92-2 because (1) all licensees may not
automatically receive Maintenance Update 92-2 and (2) licensees may believe
that the eyebolts are qualified for safety-related service because the vendor
supplied the eyebolts.
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 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 contacts: Stephen Elrod, RII Richard Freudenberger, RII
(407) 464-7822 (904) 795-7677 Lee Keller, RII Thomas Scarbrough, NRR
(803) 345-5683 (301) 504-2794 Attachments: _ 'I ACi
1. Excerpt from Limitorque Maintenance Update 92-2
2. List of Recently Issued NRC Information Notices
- SEE PREVIOUS CONCURRENCES
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0DC 1_)Add-::7_ AJi06
IN 93-XX
April XX, 1993 Discussion
South Carolina Electric and Gas (SCE&G), the licensee for Summer, determined
that the affected valve operators arrived from the Limitorque Corporation, the
valve operator vendor, with the eyebolts installed. In a letter to SCE&G of
December 11, 1992, Limitorque confirmed that it had shipped valve operators
with eyebolts installed since the early 1970s, that Limitorque did not control
the eyebolt material, and that therefore it could not yet address the
qualification of the eyebolt material for actuator operation. Limitorque
representatives stated that they had not received any reports of failures
associated with the eyebolts. Limitorque has issued Maintenance Update 92-2, in which it discusses this problem in paragraph 9, and recommends that the
eyebolts be replaced by grade 5 housing cover bolts at the next scheduled
maintenance.
The NRC staff believes that ungraded eyebolts are probably installed in
various safety-related applications at other facilities since this condition
was not previously documented by the vendor. The NRC has attached an excerpt
from the Limitorque Maintenance Update 92-2 because (1) all licensees may not
automatically receive Maintenance Update 92-2 and (2) licensees may believe
that the eyebolts are qualified for safety-related service because the vendor
supplied the eyebolts.
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 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 contacts: Stephen Elrod, RII Richard Freudenberger, RII
(407) 464-7822 (904) 795-7677 Lee Keller, RII Thomas Scarbrough, NRR
(803) 345-5683 (301) 504-2794 Attachments:
1. Excerpt from Limitorque Maintenance Update 92-2
2. List of Recently Issued NRC Information Notices
- SEE PREVIOUS CONCURRENCES
D/DORS:NRR
BKGrimes
C/OGCB:DORS:NRR
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02/25/93 03/02/93 03/03/93 03/18/93 03/02/93
s _IN 93-XX
April XX, 1993 Discussion
South Carolina Electric and Gas (SCE&G), the licensee for Summer, determined
that the affected valve operators arrived from the Limitorque Corporation, the
valve operator vendor, with the eyebolts installed. In a letter to SCE&G of
December 11, 1992, Limitorque confirmed that it had shipped valve operators
with eyebolts installed since the early 1970s, that Limitorque did not control
the eyebolt material, and that therefore it could not yet address the
qualification of the eyebolt material for actuator operation. Limitorque
representatives stated that they had not received any reports of failures
associated with the eyebolts. Limitorque has issued Maintenance Update 92-2, in which it discusses this problem in paragraph 9, and recommends that the
eyebolts be replaced by grade 5 housing cover bolts at the next scheduled
maintenance.
The NRC staff believes that ungraded eyebolts are probably installed in
various safety-related applications at other facilities since this condition
was not previously documented by the vendor. The NRC has attached an excerpt
from the Limitorque Maintenance Update 92-2 because (1) all licensees may not
automatically receive Maintenance Update 92-2 and (2) licensees may believe
that the eyebolts are qualified for safety-related service because the vendor
supplied the eyebolts.
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 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 contacts: Stephen Elrod, RII Richard Freudenberger, RII
(407) 464-7822 (904) 795-7677 Lee Keller, RII Thomas Scarbrough, NRR
(803) 345-5683 (301) 504-2794 Attachments:
1. Excerpt from Limitorque Maintenance Update 92-2
2. List of Recently Issued NRC Information Notices
- SEE PREVIOUS CONCURRENCES
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March XX. 1993 South Carolina Electric and Gas (SCE&G), the licensee for Summer, determined
that the affected valve operators arrived from the Limitorque Corporation, the
valve operator vendor, with the eyebalts installed. In a letter to SCE&G of
December 11, 1092, Limltorque confirm#d that Ithad shipped valve operators
with eyabolts installed since the early 1970:, that the eyebolt material was
not controlled by Limitorque, and that therefore the question of the
qualification of the eyebolt material for actuator operation could not
currently be addressed. Llmitorque stated that It had not received any
reports of failures associated with the eyebolts. Subsequently, Llmitorqut
issued Maintenance Update 92-2 which discussed this problem in paragraph 9, and recommended thit the eyeboits be replaced by grade S housing cover bolts
at the next scheduled maintenance.
The NRC staff considers it likely that ungraded eyebolts exist in various
licensee safety-related applications since this condition was not previously
documented by the vendor. The attached excerpt from the Limitorque
Maintenance Update 92-2 isprovided because the NRC staff Isconcerned that:
(1 all lIcenses may not automatically receive Maintenance Update 92-2 and
(2)licensees ay believo that the eyebolts are qualified for safety-rilated
service because the vendor supplied the eyobolts.
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 or the appropriate Office of
Nuclear Reactor Regulation (NRR) project manager.
Brian K. Grimes, Director
Division of Oporating Reactor Support
Office of Nuc lear Reactor Regulation
Technical contacts; Steohen Elrod, RI! Richard Freudenberger, RI!
(407) 464-7822 (904) 795-7677 Lee Keller, RII Thomas Scarbrough, NRR
(803) 345-5683 (301) 504-2794 Attachments:
1. Excerpt from Llmitorque Maintenance Update 92-2
2. List of Recently Issued NRC Information Notices
- SEE PREVI[OUS CNtWEJ~
OS C/DORS;NRR
C/OGCB:DORS:NRR D/DRIL:NRR
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s'-' IN 93-XX
March XX, 1993 Discussion
South Carolina Electric and Gas (SCE&G), the licensee for Summer, determined
that the affected valve operators arrived from the Limitorque Corporation, the
valve operator vendor, with the eyebolts installed. In a letter to SCE&G of
December 11, 1992, Limitorque confirmed that it had shipped valve operators
with eyebolts installed since the early 1970s, that the eyebolt material was
not controlled by Limitorque, and that therefore the question of the
qualification of the eyebolt material for actuator operation could not
currently be addressed. Limitorque stated that it had not received any
reports of failures associated with the eyebolts. Subsequently, Limitorque
issued Maintenance Update 92-2, which discussed this problem in paragraph 9, and recommended that the eyebolts be replaced by grade 5 housing cover bolts
at the next scheduled maintenance.
The NRC staff considers it likely that ungraded eyebolts exist in various
licensee safety-related applications since this condition was not previously
documented by the vendor. The attached excerpt from the Limitorque
Maintenance Update 92-2 is provided because the NRC staff is concerned that:
(1) all licensees may not automatically receive Maintenance Update 92-2 and
(2) licensees may believe that the eyebolts are qualified for safety-related
service because the vendor supplied the eyebolts.
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 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 contacts: Stephen Elrod, RII Richard Freudenberger, RII
(407) 464-7822 (904) 795-7677 Lee Keller, RII Thomas Scarbrough, NRR
(803) 345-5683 (301) 504-2794 Attachments:
1. Excerpt from Limitorque Maintenance Update 92-2
2. List of Recently Issued NRC Information Notices
- SEE PREVIOUS CONCURRENCES
D/DORS:NRR C/OGCB:DORS:NRR D/DRIL:NRR
BKGrimes GHMarcus CERossi
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IN 93-XX
March XX, 1993 RIscu SIon
South Carolina Elect:ric and Gas (;CE&G), th licensee for Summer, determinedthe
that the affected va llve operators arrived from the limitorque Corporation, SCE&G of
valve operator vendoir,wIth the e (ebolts installed. In a letter tooperators
December 11. 1992, L,imitorque con Firmed that It had shipped valve
with eyebolts Instal led since the early 1970s, that the eyeboltofmaterial was
not controlled by Limitorque, and that therefore the question the
qualification of the eyebolt mate 1ial for actuator operation could not
currently be address'ad. Limitorq ie stated that it had not received any
reports of failures assoclated wIth the eyebolts. Subsequently, Limitorque9, Issued Maintenance .1pdate 92-2, w 1ich discussed this problem in paragraph
and recommended that the eysbolts be replaced by grade 5 housing cover bolts
at the next scheduleidmaintenance
The NRC staff consic ers it likely that ungraded eyebolts exist In various
1icensee safety-rel ted 4pplicati Dns since this condition was not previously
documented by the vindor. The attached excerpt from the Llmitorque
Maintenance Update 52-2 is provid ed because the NRC staff is concerned that:
(1)all licensees mi iy not automat ically receive Maintenance Update 92-2 and
(2)licensees may bfIlieve that the eyebolts are qualified for safety-related
service because the vendor suppli ed the eyebolts
This information nol ice requires no specific action or written response. If
you have any questl ns about the information in this notice, please contact
one of the technica contacts lis ted below or the appropriate Office of
Nuclear Reactor Regi lation (NRR) project manager.
Brian K. Grimes, Director
Division of Operating Reactor Support
Office of Nuclear Reactor Regulation
Technical contacts: Ste phen Elroc
- RII Richard Freudenberger, RII
(407) 464-78; 2 (904) 795-7677
- Lee Keller, III Thomas Scarbrough. NRR
(803) 345-561'3 (301) 504-2794 Attachments: I
1. Excerpt from Limitorque Mal tenance Update 92-2
2. List of Recently Issued NRC Information Notices
- SEE PREVIOUS CONCURRENCES
D/D RS:NRR C/OGCB:DORS:NRR D/DRIL:NRR
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02/25/93 03/2 /93iU 0 - X/ 3/ /93 03/ /93 SO 'd £ id INI1-- 3 HIMJ OUN EBSE aeo T0 ca:60 £66T-20-z0
FROM USNRC ST. LUCIE 03/02/93 09:42 P. 5
... a.DAA
March XX, 1993
^ , . South Carolina'Electric znd Gas (SCE&G), the licensee for Summer, determined
that the Affected valve operators arrived from the Llmitorque Corporation, the
valve operator vendor, with the eyebolts installed. In a letter to SCE&G of
December 11, 1992, Limitorque confirmed that it had shipped valve operators
with eyebolts Installed since the early 1970s, that the eyebolt material was
not controlled by Limitorque, and that therefore the question of the
qualification of the Qyebolt material for actuator operation could not
currently be addressed. Limitorque stated that it had not received any
reports of failures associated with the eyebolts. Subsequently, Limitorque
issued Maintenance Update 92-2, which discussed this problem in paragraph 9, and recommended that the eyebolts be replaced by gradQ 5 housing cover boll-s
at the next scheduled malntenance.
The NRC staff considers it likely that ungraded eyebolts exist In various
licenses safety-related applications since this condition was not, previously
documented by the vendor. The attached excerpt from the Limitorque
Maintenance Update 92-2 is provided because the NRC staff is concerned that:
(1)all licensees may not automatically receive Maintenance Update 92-2 and
(2)licensees may bellevA that the eyebolts are qualified for safety-related
service because the vendor supplied the eyebolts.
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 or the appropriate Office of
Nuclear Reactor Regulation (NRR) project manager.
Brian K. Grimes, Director
Division of Op orating Reactor Support
Office of Nuclear Reactor Regulation
Technical contacts: Staphen Elrod, RI! Richard Freudenberger, RI!
(407) 464-7822 (904) 795-7677 Lee Kellor, RII Thomas Scarbrough, NRR
(803) 345-5683 (301) 504-2794 Attachments:
1. Excerpt from Limitorque Maintenance Update 92-2
2. List of Recently Issued NRC Information Notices
- SEE PREVIOUS CONCURRENCES
D/DORS:NRR C/OGCB:DORS :NRR D/DRIL: NRR
BKGrimes GHMarcus CERossi
03/ /93 03/ /93 03/ /93 C/EMEB:DE:NRR D/DE:NRR RVIB:DRIL:NRR RVIB:DRIL:NRR C/RVIB:DRIL:NRR
JANorberg JERichardson LLCampbel 1 UPotapovs LJNorrhnl m
03/ /93 03/ /93 03/ /93 03/ /93 03/ /93 ORP:RII DRP:RII D/DRP:RII EMEB:DE:NRR EMEB:t)E:NRR
RPSchtn MVSi nkule EWMerschoff TGScarbrough EJSul lIvan
03/ /93 03/ /93 03/ /93 03/ /93 03/ /93
- RPB:ADM OGCB: DORS: NRR RII RIl
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IN 93-XX
March XX, 1993 Discussion
South Carolina Electric and Gas (SCE&G), the licensee for Summer, determined
that the affected valve operators arrived from the Limitorque Corporation, the
valve operator vendor, with the eye bolts installed. In a letter to SCE&G of
December 11, 1992, Limitorque confirmed that it had shipped valve operators
with eye bolts installed since the early 1970s, that the eye bolt material was
not controlled by Limitorque, and that therefore the question of the
qualification of the eye bolt material for actuator operation could not
currently be addressed. Limitorque stated that it had not received any
reports of failures associated with the eye bolts. Subsequently, Limitorque
issued Maintenance Update 92-2, which discussed this problem in paragraph 9, and recommended that the eye bolts be replaced by grade 5 housing cover bolts
at the next scheduled maintenance.
The NRC staff considers it likely that ungraded eye bolts exist in various
licensee safety-related applications since this condition was not previously
documented by the vendor. The attached excerpt from the Limitorque
Maintenance Update 92-2 is provided because the NRC staff is concerned that:
(1) all licensees may not automatically receive Maintenance Update 92-2 and
(2) licensees may believe that the eye bolts are qualified for safety-related
service because the vendor supplied the eye bolts.
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 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 contacts: Stephen Elrod, RII Rich Freudenberger, RII
(407) 464-7822 (904) 795-7677 Lee Keller, RII
(803) 345-5683 Attachments:
1. Excerpt from Limitorque Maintenance Update 92-2
2. List of Recently Issued NRC Information Notices
C/OGCB:DORS:NRR D/DORS:NRR
GHMarcus BKGrimes
03/ /93 03/ /93 D/DE:NRR RVIB:DRIL:NRR RVIB:DRIL:NRR C/RVIB:DRIL:NRR D/DRIL:NRR
JERichardson LJNorrholm CERossi
03/ /93 03/ /93 03/ /93 03/ /93 03/ /93 RPB:ADM OGCB:DORS:NRR EMEB:DE:NRR EMEB:DE:NRR C/EMEB:DE:NRR
TechEdUJamn4A AJKugler TGScarbrough EJSullivan JANorberg
02/25/93 I 02/ /93 03/ /93 03/ /93 03/ /93