Information Notice 1988-84, Defective Motor Shaft Keys in Limitorque Motor Actuators: Difference between revisions

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{{#Wiki_filter:4.UNITED STATESNUCLEAR REGULATORY COMMISSIONOFFICE OF NUCLEAR REACTOR REGULATIONWASHINGTON, D.C. 20555October 20, 1988NRC INFORMATION NOTICE NO. 88-84: DEFECTIVE MOTOR SHAFT KEYS IN LIMITORQUEMOTOR ACTUATORS
{{#Wiki_filter:4.UNITED STATES NUCLEAR REGULATORY
 
COMMISSION
 
===OFFICE OF NUCLEAR REACTOR REGULATION===
WASHINGTON, D.C. 20555 October 20, 1988 NRC INFORMATION
 
NOTICE NO. 88-84: DEFECTIVE
 
===MOTOR SHAFT KEYS IN LIMITORQUE===
MOTOR ACTUATORS


==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 being provided to alert recipients to potentialproblems from defective motor shaft keys installed in certain Limitorqueactuators. It is expected that recipients will review the information forapplicability to their facilities and consider actions, as appropriate, toavoid similar problems. However, suggestions contained in this informationnotice do not constitute NRC requirements; therefore, no specific action orwritten response is required.
: This information
 
notice is being provided to alert recipients
 
to potential problems from defective
 
motor shaft keys installed
 
in certain Limitorque
 
actuators.
 
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 do not constitute
 
NRC requirements;  
therefore, no specific action or written response is required.Description
 
of Circumstances:
On October 15, 1987, the NRC received a report from Houston Lighting and Power Company concerning
 
sheared motor shaft-to-pinion
 
keys found in a Limitorque
 
actuator at its South Texas Project, Unit 2, nuclear plant. A similar key'failure also occurred in April 1987. The sheared key from one of the valves.was sent to a metallurgical
 
laboratory
 
which found that the properties
 
of the-.material were not consistent
 
with those of American Iron and Steel Institute (AISI) type 1018 steel. AISI type 1018 steel is the material designated
 
by Limitorque
 
for these particular
 
keys as specified
 
in Limitorque
 
design documents.
 
In August 1987, three additional
 
keys had been removed from similar actuators and sent to the laboratory
 
for analysis.
 
One of the removed keys was split and the other two showed signs of deformation.
 
Laboratory
 
analysis of these keys revealed that the properties
 
of the key material were not consistent
 
with those of AISI type 1018 steel. The metallurgical
 
analysis revealed that the keys had failed longitudinally
 
along manganese
 
sulfide inclusions
 
and that the key material was probably an AISI type 1118 or 1119 resulphurized
 
steel. Addi-tionally, on March 16, 1983, Westinghouse
 
had submitted
 
a 10 CFR Part 21 report to the NRC concerning
 
its discovery
 
of sheared keys on six actuators.
 
These keys were also analyzed and found to be made of other than AISI type 1018 steel.Discussion:
During an NRC inspection
 
at Limitorque
 
in May 1988, inspectors
 
found that at the time of the manufacture
 
of the South Texas actuators, keys were purchased<0 At101t40018 IN 88-84 October 20, 1988 from a commercial
 
vendor without certificates
 
of conformance
 
for the material type or properties.
 
No checks were performed
 
at Limitorque
 
to verify that the proper key material was received.
 
Keys purchased
 
today are still bought as commercial
 
grade; however, certified
 
material test reports (CMTRs) are received from the vendor. Limitorque
 
also performs hardness and dimensional
 
checks of the keys upon receipt from the vendor.In a letter to the NRC dated May 19, 1988, Limitorque
 
provided additional
 
in-formation
 
on this issue. Limitorque
 
stated that the current material control procedures
 
for key procurement
 
were fully implemented
 
in September
 
1983. At that time, the existing key inventory
 
was scrapped and completely
 
replaced with keys purchased
 
under the new controls.
 
It is estimated
 
that all actuators
 
from serial number 362735 onward were supplied with keys procured under the upgraded material controls.
 
Additionally, Limitorque
 
determined
 
that only the following actuator-motor
 
combinations
 
could potentially
 
experience
 
similar key failures due to improper material.Unit Size Motor Size SMB-000 None SMB-OO 25-ft.lb 1800 rpm SMB-0 25-ft.lb 1800 rpm 25-ft.ThY
 
-3600 rpm--40-ft.lb 1800 rpm SMB-1 60-ft.lb 1800 rpm 60-ft.lb 3600 rpm SMB-2 80-ft.lb 3600 rpm No specific action or written response is required by this information
 
notice.If you have any questions
 
about this matter, please contact the technical contact listed below or the Regional Administrator
 
of the appropriate
 
regional office.Division of Operational
 
===Events Assessment===
Office of Nuclear Reactor Regulation
 
Technical
 
Contact: Jeffrey B. Jacobson, NRR (301) 492-0996 Attachment:
List of Recently Issued NRC Information
 
Notices
 
, 0 A -%If Attachment
 
IN 88-84 October 20, 1988 LIST OF RECENTLY ISSUED NRC INFORMATION
 
NOTICES Information
 
Date of Notice No. Subject Issuance Issued to 88-83 88-82 88-81 88-80 88-79 Inadequate
 
Testing of Relay Contacts in Safety-Related
 
Logic Systems Torus Shells with Corrosion and Degraded Coatings in BWR Containments
 
Failure of Amp Window Indent Kynar Splices and Thomas and Betts Nylon Wire Caps During Environmental
 
Quali-fication Testing Unexpected
 
Piping Movement Attributed
 
to Thermal Stratification
 
Misuse of Flashing Lights for High Radiation
 
Area Controls 10/19/88 10/14/88 10/7/88 10/7/88 10/7/88 All holders of OLs or CPs for nuclear power reactors.All holders of OLs or CPs for BWRs.All holders of OLs or CPs for nuclear power, test, and research reactors.All holders of OLs or CPs for PWRs.All holders of OLs or CPs for nuclear power reactors.88-69, Supp 1 Movable Contact Finger Binding in HFA Relays Manufactured
 
by General Electric (GE)9/29/88 All holders of OLs or CPs for nuclear power reactors.88-78 88-77 88-76 Implementation
 
of Revised NRC-Administered
 
Requali-fication Examinations
 
Inadvertent
 
Reactor Vessel Overfill Recent Discovery
 
of a Phenomenon
 
not Previously
 
Considered
 
in the Design of Secondary


==Description of Circumstances==
Containment
:On October 15, 1987, the NRC received a report from Houston Lighting and PowerCompany concerning sheared motor shaft-to-pinion keys found in a Limitorqueactuator at its South Texas Project, Unit 2, nuclear plant. A similar key'failure also occurred in April 1987. The sheared key from one of the valves.was sent to a metallurgical laboratory which found that the properties of the-.material were not consistent with those of American Iron and Steel Institute(AISI) type 1018 steel. AISI type 1018 steel is the material designated byLimitorque for these particular keys as specified in Limitorque design documents.In August 1987, three additional keys had been removed from similar actuatorsand sent to the laboratory for analysis. One of the removed keys was splitand the other two showed signs of deformation. Laboratory analysis of thesekeys revealed that the properties of the key material were not consistent withthose of AISI type 1018 steel. The metallurgical analysis revealed that thekeys had failed longitudinally along manganese sulfide inclusions and that thekey material was probably an AISI type 1118 or 1119 resulphurized steel. Addi-tionally, on March 16, 1983, Westinghouse had submitted a 10 CFR Part 21 reportto the NRC concerning its discovery of sheared keys on six actuators. Thesekeys were also analyzed and found to be made of other than AISI type 1018 steel.Discussion:During an NRC inspection at Limitorque in May 1988, inspectors found that atthe time of the manufacture of the South Texas actuators, keys were purchased<0 At101t40018 IN 88-84October 20, 1988 from a commercial vendor without certificates of conformance for the materialtype or properties. No checks were performed at Limitorque to verify that theproper key material was received. Keys purchased today are still bought ascommercial grade; however, certified material test reports (CMTRs) are receivedfrom the vendor. Limitorque also performs hardness and dimensional checks ofthe keys upon receipt from the vendor.In a letter to the NRC dated May 19, 1988, Limitorque provided additional in-formation on this issue. Limitorque stated that the current material controlprocedures for key procurement were fully implemented in September 1983. Atthat time, the existing key inventory was scrapped and completely replaced withkeys purchased under the new controls. It is estimated that all actuators fromserial number 362735 onward were supplied with keys procured under the upgradedmaterial controls. Additionally, Limitorque determined that only the followingactuator-motor combinations could potentially experience similar key failuresdue to improper material.Unit Size Motor SizeSMB-000 NoneSMB-OO 25-ft.lb 1800 rpmSMB-0 25-ft.lb 1800 rpm25-ft.ThY -3600 rpm--40-ft.lb 1800 rpmSMB-1 60-ft.lb 1800 rpm60-ft.lb 3600 rpmSMB-2 80-ft.lb 3600 rpmNo specific action or written response is required by this information notice.If you have any questions about this matter, please contact the technicalcontact listed below or the Regional Administrator of the appropriate regionaloffice.Division of Operational Events AssessmentOffice of Nuclear Reactor Regulation


===Technical Contact:===
Pressure Control 9/22/88 9/22/88 9/19/88 All holders of OLs or CPs for nuclear power reactors.All holders of OLs or CPs for BWRs.All holders of OLs or CPs for nuclear power reactors.OL = Operating
Jeffrey B. Jacobson, NRR(301) 492-0996Attachment: List of Recently Issued NRC Information Notices


, 0 A -%IfAttachmentIN 88-84October 20, 1988 LIST OF RECENTLY ISSUEDNRC INFORMATION NOTICESInformation Date ofNotice No. Subject Issuance Issued to88-8388-8288-8188-8088-79Inadequate Testing of RelayContacts in Safety-RelatedLogic SystemsTorus Shells with Corrosionand Degraded Coatings inBWR ContainmentsFailure of Amp WindowIndent Kynar Splicesand Thomas and BettsNylon Wire Caps DuringEnvironmental Quali-fication TestingUnexpected Piping MovementAttributed to ThermalStratificationMisuse of Flashing Lightsfor High Radiation AreaControls10/19/8810/14/8810/7/8810/7/8810/7/88All holders of OLsor CPs for nuclearpower reactors.All holders of OLsor CPs for BWRs.All holders of OLsor CPs for nuclearpower, test, andresearch reactors.All holders of OLsor CPs for PWRs.All holders of OLsor CPs for nuclearpower reactors.88-69, Supp 1Movable Contact FingerBinding in HFA RelaysManufactured by GeneralElectric (GE)9/29/88All holders of OLsor CPs for nuclearpower reactors.88-7888-7788-76Implementation of RevisedNRC-Administered Requali-fication ExaminationsInadvertent ReactorVessel OverfillRecent Discovery of aPhenomenon not PreviouslyConsidered in the Designof Secondary ContainmentPressure Control9/22/889/22/889/19/88All holders of OLsor CPs for nuclearpower reactors.All holders of OLsor CPs for BWRs.All holders of OLsor CPs for nuclearpower reactors.OL = Operating LicenseCP = Construction Permit
License CP = Construction


}}
Permit}}


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

Revision as of 13:38, 31 August 2018

Defective Motor Shaft Keys in Limitorque Motor Actuators
ML031150062
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, 05000000, Zimmer, Fort Saint Vrain, Shoreham, Satsop, Trojan, Atlantic Nuclear Power Plant
Issue date: 10/20/1988
From: Rossi C E
Office of Nuclear Reactor Regulation
To:
References
IN-88-084, NUDOCS 8810140018
Download: ML031150062 (3)
v • d • e


4.UNITED STATES NUCLEAR REGULATORY

COMMISSION

OFFICE OF NUCLEAR REACTOR REGULATION

WASHINGTON, D.C. 20555 October 20, 1988 NRC INFORMATION

NOTICE NO. 88-84: DEFECTIVE

MOTOR SHAFT KEYS IN LIMITORQUE

MOTOR ACTUATORS

Addressees

All holders of operating

licenses or construction

permits for nuclear power reactors.

Purpose

This information

notice is being provided to alert recipients

to potential problems from defective

motor shaft keys installed

in certain Limitorque

actuators.

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 do not constitute

NRC requirements;

therefore, no specific action or written response is required.Description

of Circumstances:

On October 15, 1987, the NRC received a report from Houston Lighting and Power Company concerning

sheared motor shaft-to-pinion

keys found in a Limitorque

actuator at its South Texas Project, Unit 2, nuclear plant. A similar key'failure also occurred in April 1987. The sheared key from one of the valves.was sent to a metallurgical

laboratory

which found that the properties

of the-.material were not consistent

with those of American Iron and Steel Institute (AISI) type 1018 steel. AISI type 1018 steel is the material designated

by Limitorque

for these particular

keys as specified

in Limitorque

design documents.

In August 1987, three additional

keys had been removed from similar actuators and sent to the laboratory

for analysis.

One of the removed keys was split and the other two showed signs of deformation.

Laboratory

analysis of these keys revealed that the properties

of the key material were not consistent

with those of AISI type 1018 steel. The metallurgical

analysis revealed that the keys had failed longitudinally

along manganese

sulfide inclusions

and that the key material was probably an AISI type 1118 or 1119 resulphurized

steel. Addi-tionally, on March 16, 1983, Westinghouse

had submitted

a 10 CFR Part 21 report to the NRC concerning

its discovery

of sheared keys on six actuators.

These keys were also analyzed and found to be made of other than AISI type 1018 steel.Discussion:

During an NRC inspection

at Limitorque

in May 1988, inspectors

found that at the time of the manufacture

of the South Texas actuators, keys were purchased<0 At101t40018 IN 88-84 October 20, 1988 from a commercial

vendor without certificates

of conformance

for the material type or properties.

No checks were performed

at Limitorque

to verify that the proper key material was received.

Keys purchased

today are still bought as commercial

grade; however, certified

material test reports (CMTRs) are received from the vendor. Limitorque

also performs hardness and dimensional

checks of the keys upon receipt from the vendor.In a letter to the NRC dated May 19, 1988, Limitorque

provided additional

in-formation

on this issue. Limitorque

stated that the current material control procedures

for key procurement

were fully implemented

in September

1983. At that time, the existing key inventory

was scrapped and completely

replaced with keys purchased

under the new controls.

It is estimated

that all actuators

from serial number 362735 onward were supplied with keys procured under the upgraded material controls.

Additionally, Limitorque

determined

that only the following actuator-motor

combinations

could potentially

experience

similar key failures due to improper material.Unit Size Motor Size SMB-000 None SMB-OO 25-ft.lb 1800 rpm SMB-0 25-ft.lb 1800 rpm 25-ft.ThY

-3600 rpm--40-ft.lb 1800 rpm SMB-1 60-ft.lb 1800 rpm 60-ft.lb 3600 rpm SMB-2 80-ft.lb 3600 rpm No specific action or written response is required by this information

notice.If you have any questions

about this matter, please contact the technical contact listed below or the Regional Administrator

of the appropriate

regional office.Division of Operational

Events Assessment

Office of Nuclear Reactor Regulation

Technical

Contact: Jeffrey B. Jacobson, NRR (301) 492-0996 Attachment:

List of Recently Issued NRC Information

Notices

, 0 A -%If Attachment

IN 88-84 October 20, 1988 LIST OF RECENTLY ISSUED NRC INFORMATION

NOTICES Information

Date of Notice No. Subject Issuance Issued to 88-83 88-82 88-81 88-80 88-79 Inadequate

Testing of Relay Contacts in Safety-Related

Logic Systems Torus Shells with Corrosion and Degraded Coatings in BWR Containments

Failure of Amp Window Indent Kynar Splices and Thomas and Betts Nylon Wire Caps During Environmental

Quali-fication Testing Unexpected

Piping Movement Attributed

to Thermal Stratification

Misuse of Flashing Lights for High Radiation

Area Controls 10/19/88 10/14/88 10/7/88 10/7/88 10/7/88 All holders of OLs or CPs for nuclear power reactors.All holders of OLs or CPs for BWRs.All holders of OLs or CPs for nuclear power, test, and research reactors.All holders of OLs or CPs for PWRs.All holders of OLs or CPs for nuclear power reactors.88-69, Supp 1 Movable Contact Finger Binding in HFA Relays Manufactured

by General Electric (GE)9/29/88 All holders of OLs or CPs for nuclear power reactors.88-78 88-77 88-76 Implementation

of Revised NRC-Administered

Requali-fication Examinations

Inadvertent

Reactor Vessel Overfill Recent Discovery

of a Phenomenon

not Previously

Considered

in the Design of Secondary

Containment

Pressure Control 9/22/88 9/22/88 9/19/88 All holders of OLs or CPs for nuclear power reactors.All holders of OLs or CPs for BWRs.All holders of OLs or CPs for nuclear power reactors.OL = Operating

License CP = Construction

Permit


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