Weschler Instruments Model 252 Switchboard Meters| ML031080024 |
| Person / Time |
|---|
| Site: |
Beaver Valley, Millstone, Hatch, Monticello, Calvert Cliffs, Dresden, Davis Besse, Peach Bottom, Browns Ferry, Salem, Oconee, Mcguire, Nine Mile Point, Palisades, Palo Verde, Perry, Indian Point, Fermi, Kewaunee, Catawba, Harris, Wolf Creek, Saint Lucie, Point Beach, Oyster Creek, Watts Bar, Hope Creek, Grand Gulf, Cooper, Sequoyah, Byron, Pilgrim, Arkansas Nuclear, Three Mile Island, Braidwood, Susquehanna, Summer, Prairie Island, Columbia, Seabrook, Brunswick, Surry, Limerick, North Anna, Turkey Point, River Bend, Vermont Yankee, Crystal River, Haddam Neck, Ginna, Diablo Canyon, Callaway, Vogtle, Waterford, Duane Arnold, Farley, Robinson, Clinton, South Texas, San Onofre, Cook, Comanche Peak, Yankee Rowe, Maine Yankee, Quad Cities, Humboldt Bay, La Crosse, Big Rock Point, Rancho Seco, Zion, Midland, Bellefonte, Fort Calhoun, FitzPatrick, McGuire, LaSalle, Fort Saint Vrain, Shoreham, Satsop, Trojan, Atlantic Nuclear Power Plant  |
|---|
| Issue date: |
03/31/1993 |
|---|
| From: |
Grimes B
Office of Nuclear Reactor Regulation |
|---|
| To: |
|
|---|
| References |
|---|
| IN-93-023, NUDOCS 9303240274 |
| Download: ML031080024 (23) |
|
Similar Documents at 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 |
|---|
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2020-09-03 The following query condition could not be considered due to this wiki's restrictions on query size or depth: <code> [[:Beaver Valley]] OR [[:Millstone]] OR [[:Hatch]] OR [[:Monticello]] OR [[:Calvert Cliffs]] OR [[:Dresden]] OR [[:Davis Besse]] OR [[:Peach Bottom]] OR [[:Browns Ferry]] OR [[:Salem]] OR [[:Oconee]] OR [[:Mcguire]] OR [[:Nine Mile Point]] OR [[:Palisades]] OR [[:Palo Verde]] OR [[:Perry]] OR [[:Indian Point]] OR [[:Fermi]] OR [[:Kewaunee]] OR [[:Catawba]] OR [[:Harris]] OR [[:Wolf Creek]] OR [[:Saint Lucie]] OR [[:Point Beach]] OR [[:Oyster Creek]] OR [[:Watts Bar]] OR [[:Hope Creek]] OR [[:Grand Gulf]] OR [[:Cooper]] OR [[:Sequoyah]] OR [[:Byron]] OR [[:Pilgrim]] OR [[:Arkansas Nuclear]] OR [[:Three Mile Island]] OR [[:Braidwood]] OR [[:Susquehanna]] OR [[:Summer]] OR [[:Prairie Island]] OR [[:Columbia]] OR [[:Seabrook]] OR [[:Brunswick]] OR [[:Surry]] OR [[:Limerick]] OR [[:North Anna]] OR [[:Turkey Point]] OR [[:River Bend]] OR [[:Vermont Yankee]] OR [[:Crystal River]] OR [[:Haddam Neck]] OR [[:Ginna]] OR [[:Diablo Canyon]] OR [[:Callaway]] OR [[:Vogtle]] OR [[:Waterford]] OR [[:Duane Arnold]] OR [[:Farley]] OR [[:Robinson]] OR [[:Clinton]] OR [[:South Texas]] OR [[:San Onofre]] OR [[:Cook]] OR [[:Comanche Peak]] OR [[:Yankee Rowe]] OR [[:Maine Yankee]] OR [[:Quad Cities]] OR [[:Humboldt Bay]] OR [[:La Crosse]] OR [[:Big Rock Point]] OR [[:Rancho Seco]] OR [[:Zion]] OR [[:Midland]] OR [[:Bellefonte]] OR [[:Fort Calhoun]] OR [[:FitzPatrick]] OR [[:McGuire]] OR [[:LaSalle]] OR [[:Fort Saint Vrain]] OR [[:Shoreham]] OR [[:Satsop]] OR [[:Trojan]] OR [[:Atlantic Nuclear Power Plant]] </code>.
[Table view]The following query condition could not be considered due to this wiki's restrictions on query size or depth: <code> [[:Beaver Valley]] OR [[:Millstone]] OR [[:Hatch]] OR [[:Monticello]] OR [[:Calvert Cliffs]] OR [[:Dresden]] OR [[:Davis Besse]] OR [[:Peach Bottom]] OR [[:Browns Ferry]] OR [[:Salem]] OR [[:Oconee]] OR [[:Mcguire]] OR [[:Nine Mile Point]] OR [[:Palisades]] OR [[:Palo Verde]] OR [[:Perry]] OR [[:Indian Point]] OR [[:Fermi]] OR [[:Kewaunee]] OR [[:Catawba]] OR [[:Harris]] OR [[:Wolf Creek]] OR [[:Saint Lucie]] OR [[:Point Beach]] OR [[:Oyster Creek]] OR [[:Watts Bar]] OR [[:Hope Creek]] OR [[:Grand Gulf]] OR [[:Cooper]] OR [[:Sequoyah]] OR [[:Byron]] OR [[:Pilgrim]] OR [[:Arkansas Nuclear]] OR [[:Three Mile Island]] OR [[:Braidwood]] OR [[:Susquehanna]] OR [[:Summer]] OR [[:Prairie Island]] OR [[:Columbia]] OR [[:Seabrook]] OR [[:Brunswick]] OR [[:Surry]] OR [[:Limerick]] OR [[:North Anna]] OR [[:Turkey Point]] OR [[:River Bend]] OR [[:Vermont Yankee]] OR [[:Crystal River]] OR [[:Haddam Neck]] OR [[:Ginna]] OR [[:Diablo Canyon]] OR [[:Callaway]] OR [[:Vogtle]] OR [[:Waterford]] OR [[:Duane Arnold]] OR [[:Farley]] OR [[:Robinson]] OR [[:Clinton]] OR [[:South Texas]] OR [[:San Onofre]] OR [[:Cook]] OR [[:Comanche Peak]] OR [[:Yankee Rowe]] OR [[:Maine Yankee]] OR [[:Quad Cities]] OR [[:Humboldt Bay]] OR [[:La Crosse]] OR [[:Big Rock Point]] OR [[:Rancho Seco]] OR [[:Zion]] OR [[:Midland]] OR [[:Bellefonte]] OR [[:Fort Calhoun]] OR [[:FitzPatrick]] OR [[:McGuire]] OR [[:LaSalle]] OR [[:Fort Saint Vrain]] OR [[:Shoreham]] OR [[:Satsop]] OR [[:Trojan]] OR [[:Atlantic Nuclear Power Plant]] </code>. |
UNITED STATES NUCLEAR REGULATORY
COMMISSION
OFFICE OF NUCLEAR REACTOR REGULATION
WASHINGTON, D.C. 20555 March 31, 1993 NRC INFORMATION
NOTICE NO. 93-23: WESCHLER INSTRUMENTS
MODEL 252 SWITCHBOARD
METERS
Addressees
All holders of operating
licenses or construction
permits for nuclear power reactors.
7
Purpose
The U.S. Nuclear Regulatory
Commission (NRC) is issuing this information
notice to alert addressees
to possible problems with Weschler Instruments (Weschler)
Model 252 commercial
grade switchboard
meters. It is expected that recipients
will review the information
for applicability
to their facilities
and consider actions, as appropriate, to avoid similar problems.
However, suggestions
contained
in this information
notice are not NRC requirements;
therefore, no specific action or written response is required.Description
of Circumstances
On November 9, 1992, Weschler informed the NRC of sticking meter movements
in some Model 252 meters manufactured
and supplied as commercial
grade items.Although Weschler reported having no evidence that meters manufactured
specifically
for safety-related
service are affected, Weschler was concerned that affected commercial
grade meters could have been dedicated
for use in nuclear safety-related
applications.
Discussion
Weschler determined
that some of the commercial
grade meters returned for repair or calibration
were inaccurate
and erratic. The vendor engineering
report attributed
this problem to sticking of the meter movement because of an off-center
torsion spring. Weschler determined
that this condition
resulted from a deviation
in the dimensions
associated
with the torsion head screws combined with several coincidental
factors that included (1) degradation
of clip-to-torsion
screw lubrication, (2) low initial force from the spring-retaining
clip or fatigue of the spring-retaining
clip, (3) variations
in the alignment
of the meter movement during initial assembly, and (4) the effect of the summation
of the dimensional
tolerances
in the assembly of the subcomponents.
9303240274 P P 5tC C* i\ 9I _X3 C9c
IN 93-23 March 31, 1993 To prevent this deficiency
in future products, Weschler revised its production
inspection
procedures
to specifically
require checking the dimensions
in question.
Weschler also revised its nuclear quality assurance
procedures
to.require specific checks of torsion head screw dimensions, although the vendor has not detected a problem with meters manufactured
specifically
for safety-related applications.
Weschler could not determine
whether or not any Model 252 switchboard
meters sold as commercial
grade items through the various distributors
had been dedicated
for use in nuclear safety-related
applications.
Therefore, Weschler has not directly notified any licensees
about this problem.Weschler stated that the principal
corrective
action it has taken for affected meters returned for repair and recalibration
is to replace the faulty torsion head screws because they can't be repaired.
Upon request, Weschler will give licensees
information
about the problem and the recommended
corrective
measures.This information
notice requires no specific action or written response.
If you have any questions
about the information
in this notice, please contact the technical
contact listed below or the appropriate
Office of Nuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, Director Division of Operating
Reactor Support Office of Nuclear Reactor Regulation
Technical
contact: S. V. Athavale, NRR (301) 504-2974 Attachment:
List of Recently Issued NRC Information
Notices
K-I Attachment
IN 93-23 March 31, 1993 LIST OF RECENTLY ISSUED NRC INFORMATION
NOTICES Information
Date of Notice No. Subject Issuance Issued to 93-22 93-21 93-20 93-19 93-18 Tripping of Klockner-Moeller Molded-Case
Circuit Breakers due to Support Level Failure Summary of NRC Staff Observations
Compiled during Engineering
Audits or Inspections
of Licen-see Erosion/Corrosion
Programs Thermal Fatigue Cracking of Feedwater
Slab Hopper Bulging Portable Moisture-Density
Gauge User Responsibilities
during Field Operations
Safety Systems Response to Loss of Coolant and Loss of Offsite Power Failures of Nut-Locking
Devices in Check Valves Failure to Verify the Continuity
of Shunt Trip Attachment
Contacts in Manual Safety Injection and Reactor Trip Switches Clarification
of 10 CFR 40.22, Small Quantities
of Source Material 03/26/93 03/25/93 03/24/93 03/17/92 03/10/93 03/08/93 02/19/93 02/18/93 02/18/93 All holders of OLs or CPs for nuclear power reactors.All holders of OLs or CPs for light water nuclear power reactors.All holders of OLs or CPs for PWRs supplied by Westinghouse
or Combustion
Engineering.
All nuclear fuel cycle licensees.
All U.S. Nuclear Regulatory
Commission
licensees
that possess moisture-density
gauges.All holders of OLs or CPs for nuclear power reactors.All holders of OLs or CPs for nuclear power reactors.All holders of OLs or CPs for nuclear power reactors.All licensees
who possess source material.93-17 93-16 93-15 93-14 OL = Operating
License CP -Construction
Permit
~'-2 IN 93-23 March 31, 1993 To prevent this deficiency
in future products, Weschler revised its production
inspection
procedures
to specifically
require checking the dimensions
in question.
Weschler also revised its nuclear quality assurance
procedures
to require specific checks of torsion head screw dimensions, although the vendor has not detected a problem with meters manufactured
specifically
for safety-related applications.
Weschler could not determine
whether or not any Model 252 switchboard
meters sold as commercial
grade items through the various distributors
had been dedicated
for use in nuclear safety-related
applications.
Therefore, Weschler has not directly notified any licensees
about this problem.Weschler stated that the principal
corrective
action it has taken for affected meters returned for repair and recalibration
is to replace the faulty torsion head screws because they can't be repaired.
Upon request, Weschler will give licensees
information
about the problem and the recommended
corrective
measures.This information
notice requires no specific action or written response.
If you have any questions
about the information
in this notice, please contact the technical
contact listed below or the appropriate
Office of Nuclear Reactor Regulation (NRR) project manager.orig /s/'d by BKGrimes Brian K. Grimes, Director Division of Operating
Reactor Support Office of Nuclear Reactor Regulation
Technical
contact: S. V. Athavale, NRR (301) 504-2974 Attachment:
% L *List of Receitly Issudd NRC Information
Notices DOCUMENT NAME: 93-2IN*D/DRIL:NRR
- C/OGCB: DORS:NRR CERossi BABoger GHMarcus 3 03/11/93 02/11/93 03/15/93*OGCB:DORS:NRR*HICB:DRCH:NRR*SC/HICB:DRCH:NRR*C/HICB:DRCH:NRR*RPB:ADM
AJKugler SVAthavale
JMauck JWermiel TechEd 02/08/93 02/08/93 02/10/93 02/10/93 02/08/93 IN 93-XX March XX, 1993 To prevent this deficiency
in future products, Weschler revised its production
inspection
procedures
to specifically
require checking the dimensions
in question.
Weschler also revised its nuclear quality assurance
procedures
to require specific checks of torsion head screw dimensions, although the vendor has not detected a problem with meters manufactured
specifically
for safety-related applications.
Weschler could not determine
whether or not any Model 252 switchboard
meters sold as commercial
grade items through the various distributors
had been dedicated
for use in nuclear safety-related
applications.
Therefore, Weschler has not directly notified any licensees
about this problem.Weschler stated that the principal
corrective
action it has taken for affected meters returned to it for repair and recalibration
is to replace the faulty torsion head screws because they can't be repaired.
Upon request, Weschler will give licensees
information
about the problem and the recommended
corrective
measures.This information
notice requires no specific action or written response.
If you have any questions
about the information
in this notice, please contact the technical
contact listed below or the appropriate
Office of Nuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, Director Division of Operating
Reactor Suppprt Office of Nuclear Reactor Regulation
Technical
contact: S. V. Athavale (301) 504-2974 Attachment:
List of Recently Issued NRC Information
Notices D/DORS:NRR
C/OGCB:DORS:NRR
BKGrimes CERossi BABoger GHMarcu 03/ /93 03/11/93 02/11/93 / xi 9*OGCB:DORS:NRR*HICB:DRCH:NRR*SC/HICB:DRCH:NRR*C/HICB:DRCH:NRR*RPB:ADM
AJKugler SVAthavale
JMauck JWermiel TechEd 02/08/93 02/08/93 02/10/93 02/10/93 02/08/93
-C K>~IN 93-XX March XX, 1993 To prevent this deficiency
in future products, Weschler revised its production
inspection
procedures
to specifically
require checking the dimensions
in question.
Weschler also revised its nuclear quality assurance
procedures
to require specific checks of torsion head screw dimensions, although the vendor has not detected a problem with meters manufactured
specifically
for safety-related applications.
Weschler could not determine
whether or not any Model 252 switchboard
meters sold as commercial
grade items through the various distributors
had been dedicated
for use in nuclear safety-related
applications.
Therefore, Weschler has not directly notified any licensees
about this problem.Weschler stated that the principal
corrective
action it has taken for affected meters returned to it for repair and recalibration
is to replace the faulty torsion head screws because they can't be repaired.
Upon request, Weschler will give licensees
information
about the problem and the recommended
corrective
measures.This information
notice requires no specific action or written response.
If you have any questions
about the information
in this notice, please contact the technical
contact listed below or the appropriate
Office of Nuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, Director Division of Operating
Reactor Support Office of Nuclear Reactor Regulation
Technical
contact: S. V. Athavale (301) 504-2974 Attachment:
List of Recently Issued NRC Information
Notices D/DORS:NRR
C' *D/DRCH:NRR
C/OGCB:DORS:NRR
BKGrimes BABoger GHMarcus 03/ /93 03//l/93 02/11/93 02/ /93*OGCB:DORS:NRR*HICB:DRCH:NRR*SC/HICB:DRCH:NRR*C/HICB:DRCH:NRR*RPB:ADM
MD:DRIL:NRR
gtt AJKugler SVAthavale
JMauck JWermiel TechEd RZinmerman:ld
02/08/93 02/08/93 02/10/93 02/10/93 02/08/93 03/S/93
'S K>IN 93-XX February XX, 1993 To prevent this deficiency
in future products, Weschler revised its production
inspection
procedures
to specifically
require checking the dimensions
in question.
Weschler also revised its nuclear quality assurance
procedures
to require specific checks of torsion head screw dimensions, although the vendor has not detected a problem with meters manufactured
specifically
for safety-related applications.
Weschler could not determine
whether or not any Model 252 switchboard
meters sold as commercial
grade items through the various distributors
had been dedicated
for use in nuclear safety-related
applications.
Therefore, Weschler has not directly notified any licensees
about this problem.Weschler stated that the principal
corrective
action it has taken for affected meters returned to it for repair and recalibration
is to replace the faulty torsion head screws because they can not be repaired.
Upon request, Weschler will give licensees
information
about the problem and the recommended
corrective
measures.This information
notice requires no specific action or written response.
If you have any questions
about the information
in this notice, please contact the technical
contact listed below or the appropriate
Office of Nuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, Director Division of Operating
Reactor Support Office of Nuclear Reactor Regulation
Technical
contact: S. V. Athavale (301) 504-2974 Attachment:
List of Recentl Issued NRC Information
Notices D/DORS:NRR
/DRIL:NRR
Di q C/OGCB:DORS:NRR
BKGrimes CERossi er +'% GHMarcus 02/ /93 02/ /93 U02/ 1/93 02/ /93*OGCB:DORS:NRR*HICB:DRCH:NRR*SC/HICB:DRCH:NRR*C/H
B:DRCH:NRR*RPB:ADM
AJKugler SVAthavale
JMauck JWermiel TechEd 02/08/93 02/08/93 02/10/93 02/10/93 02/08/93C 0 "V C__ .1~o 2 k2%~-m &_ C6Q a e P. .TVA
-IN 93-XX--February
XX, 1993 To prevent this deficiency
in future products, Weschler has revised its production
inspection
procedures
to specifically
require checking the dimensions
in question.
In addition, Weschler has revised its nuclear quality assurance
procedures
to require specific checks of torsion head screw dimensions, although the vendor has not detected a problem with meters manufactured
specifically
for safety-related
applications.
Weschler could not determine
whether or not any Model 252 switchboard
meters sold as commercial
grade items through the various distributors
had been dedicated
for use in nuclear safety-related
applications.
Therefore, Weschler has not directly notified any licensees
about this problem.Weschler stated that the principal
corrective
action it has taken for affected meters returned to it for repair and recalibration
is to replace the faulty torsion head screws because they can not be repaired.
Weschler will provide information
about the problem and the recommended
corrective
measures to licensees
upon request.This information
notice requires no specific action or written response.
If you have any questions
about the information
in this notice, please contact the technical
contact listed below or the appropriate
Office of Nuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, Director Division of Operating
Reactor Support Office of Nuclear Reactor Regulation
Technical
contact: S. V. Athavale (301) 504-2974 Attachment:
List of Recently Issued NRC Information
Notices OGCB:DORS:NRR
AJKugler.it
02/ S/9?3U D/DORS:NRR
BKGrimes 02/ /93 HICB:DRCH:
RR SVAthavale
02/8 /93 a-.D/DRIL:NRR
CERossi 02/ /93&J .DRCH:NRR 02/ /9<Lif D/DRCH:NRR
BABoger C/H RCH:NRR JWe lel 02/10/93 C/OGCB:DORS:NRR
GHMarcus 02/ /93 RPB:ADM TechEd 02/ /93 IN 93-XX February XX, 1993 To prevent this deficiency
in future products, Weschler has revised its production
inspection
procedures
to specifically
require checking the dimensions
in question.
In addition, Weschler has revised its nuclear quality assurance
procedures
to require specific checks of torsion head screw dimensions, although the vendor has not detected a problem with meters manufactured
specifically
for safety-related
applications.
Weschler could not determine
whether or not any Model 252 switchboard
meters sold as commercial
grade items through the various distributors
had been dedicated
for use in nuclear safety-related
applications.
Therefore, Weschler has not directly notified any licensees
about this problem.Weschler stated that the principal
corrective
action it has taken for affected meters returned to it for repair and recalibration
is to replace the faulty torsion head screws because they can not be repaired.
Weschler will provide information
about the problem and the recommended
corrective
measures to licensees
upon request.This information
notice requires no specific action or written response.
If you have any questions
about the information
in this notice, please contact the technical
contact listed below or the appropriate
Office of Nuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, Director Division of Operating
Reactor Support Office of Nuclear Reactor Regulation
Technical
contact: S. V. Athavale (301) 504-2974 Attachment:
List of Recently Issued NRC Information
Notices D/DORS:NRR
D/DRIL:NRR
D/DRCH:NRR
C/OGCB:DORS:NRR
BKGrimes CERossi BABoger GHMarcus 02/ /93 02/ /93 02/ /93 02/ /93 OGCB:DORS:NRR
HICB:DRCH:NRR
SC/HICB:DRCH:NRR
C/HICB:DRCH:NRR
RPB:ADM AJKugler SVAthavale
JMauck JWermiel TechEd 1&'a;n ap 02/ /93 02/ /93 02/ /93 02/ /93 02/1 /93 a
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| list | - Information Notice 1993-01, Accuracy of Motor-Operated Valve Diagnostic Equipment Manufactured by Liberty Technologies (4 January 1993)
- Information Notice 1993-02, Malfunction of a Pressurizer Code Safety Valve (4 January 1993, Topic: Loop seal)
- Information Notice 1993-04, Investigation and Reporting of Misadministrations by the Radiation Safety Officer (7 January 1993)
- Information Notice 1993-05, Locking of Radiography Exposure Devices (14 January 1993, Topic: Uranium Hexafluoride)
- Information Notice 1993-06, Potential Bypass Leakage Paths Around Filters Installed in Ventilation Systems (22 January 1993)
- Information Notice 1993-07, Classification of Transportation Emergencies (1 February 1993)
- Information Notice 1993-08, Failure of Residual Heat Removal Pump Bearings Due to High Thrust Loading (1 February 1993, Topic: Probabilistic Risk Assessment)
- Information Notice 1993-09, Failure of Undervoltage Trip Attachment on Westinghouse Model DB-50 Reactor Trip Breaker (2 February 1993)
- Information Notice 1993-10, Dose Calibrator Quality Control (2 February 1993)
- Information Notice 1993-11, Single Failure Vulnerability of Engineered Safety Features Actuation Systems (4 February 1993)
- Information Notice 1993-12, Off-Gassing in Auxiliary Feedwater System Raw Water Sources (11 February 1993)
- Information Notice 1993-13, Undetected Modification of Flow Characteristics in High Pressure Safety Injection System (16 February 1993)
- Information Notice 1993-14, Clarification of 10 CFR 40.22, Small Quantities of Source Material (18 February 1993)
- Information Notice 1993-15, Failure to Verify the Continuity of Shunt Trip Attachment Contacts in Manual Safety Injection and Reactor Trip Switches (18 February 1993)
- Information Notice 1993-16, Failures of Not-Locking Devices in Check Valves (19 February 1993, Topic: Anchor Darling, Flow Induced Vibration)
- Information Notice 1993-17, Safety Systems Response to Loss of Coolant and Loss of Offsite Power (25 March 1994, Topic: Fire Barrier, Backfit)
- Information Notice 1993-18, Portable Moisture-Density Gauge User Responsibilities During Field Operations (10 March 1993, Topic: Moisture Density Gauge, Moisture-Density Gauge, Stolen)
- Information Notice 1993-19, Slab Hopper Bulging (17 March 1993, Topic: Hydrostatic)
- Information Notice 1993-20, Thermal Fatigue Cracking of Feedwater Piping to Steam Generators (24 March 1993)
- Information Notice 1993-21, Summary of NRC Staff Observations Compiled During Engineering Audits or Inspections of Licensee Erosion/Corrosion Programs (25 March 1993, Topic: Weld Overlay)
- Information Notice 1993-22, Tripping of Klockner-Moeller Molded-Case Circuit Breakers Due to Support Lever Failure (26 March 1993)
- Information Notice 1993-23, Weschler Instruments Model 252 Switchboard Meters (31 March 1993)
- Information Notice 1993-24, Distribution of Revision 7 of NUREG-1021, Operation Licensing Examiner Standards (31 March 1993, Topic: Job Performance Measure)
- Information Notice 1993-25, Electrical Penetration Assembly Degradation (1 April 1993)
- Information Notice 1993-26, Grease Soldification Causes Molded-Case Circuit Breaker Failure to Close (31 January 1994)
- Information Notice 1993-27, Level Instrumentation Inaccuracies Observed During Normal Plant Depressurization (8 April 1993, Topic: Reactor Vessel Water Level)
- Information Notice 1993-28, Failure to Consider Loss of DC Bus in the Emergency Core Cooling System Evaluation May Lead to Nonconservative Analysis (9 April 1993, Topic: Fuel cladding)
- Information Notice 1993-29, Problems with the Use of Unshielded Test Leads in Reactor Protection System Circuitry (12 April 1993)
- Information Notice 1993-30, NRC Requirements for Evaluation of Wipe Test Results; Calibration of Count Rate Survey Instruments (12 April 1993)
- Information Notice 1993-31, Training of Nurses Responsible for the Care of Patients with Brachytherapy Implants (13 April 1993, Topic: Brachytherapy)
- Information Notice 1993-32, Nonconservative Inputs for Boron Dilution Events Analysis (21 April 1993, Topic: Shutdown Margin)
- Information Notice 1993-33, Potential Deficiency of Certain Class Ie Instrumental and Control Cables (28 April 1993)
- Information Notice 1993-33, Potential Deficiency of Certain Class IE Instrumental and Control Cables (28 April 1993, Topic: Brachytherapy)
- Information Notice 1993-34, Potential for Loss of Emergency Cooling Function Due to a Combination of Operational and Post-LOCA Debris in Containment (6 May 1993, Topic: Brachytherapy)
- Information Notice 1993-35, Insights from Common-Cause Failure Events (12 May 1993, Topic: Brachytherapy)
- Information Notice 1993-36, Notifications, Reports, and Records of Misadministrations (7 May 1993, Topic: Brachytherapy)
- Information Notice 1993-37, Eyebolts with Indeterminate Properties Installed in Limitorque Valve Operator Housing Covers (19 May 1993, Topic: Brachytherapy)
- Information Notice 1993-38, Inadequate Testing of Engineered Safety Features Actuation Systems (24 May 1993)
- Information Notice 1993-39, Radiation Beams From Power Reactor Biological Shields (25 May 1993)
- Information Notice 1993-39, Radiation Beams from Power Reactor Biological Shields (25 May 1993)
- Information Notice 1993-40, Fire Endurance Test Results for Thermal Ceramics FP-60 Fire Barrier Material (26 May 1993, Topic: Safe Shutdown, Fire Barrier, Fire Protection Program)
- Information Notice 1993-41, One Hour Fire Endurance Test Results for Thermal Ceramics Kaowool, 3M Company FS-195 and 3M Company Interam E-50 Fire Barrier Systems (28 May 1993, Topic: Safe Shutdown, Fire Barrier)
- Information Notice 1993-42, Failure of Anti-Rotation Keys in Motor-Operated Valves Manufactured by Yelan (9 June 1993)
- Information Notice 1993-43, Use of Inappropriate Lubrication Oils in Satety-Related Applications (10 June 1993)
- Information Notice 1993-44, Operational Challenges During a Dual-Unit Transient (15 June 1993)
- Information Notice 1993-45, Degradation of Shutdown Cooling System Performance (16 June 1993)
- Information Notice 1993-46, Potential Problem with Westinghouse Rod Control System and Inadvertent Withdrawal of Single Rod Control Cluster Assembly (10 June 1993)
- Information Notice 1993-47, Unrecognized Loss of Control Room Annunciators (18 June 1993)
- Information Notice 1993-48, Failure of Turbine-Driven Main Feedwater Pump to Trip Because of Contaminated Oil (6 July 1993)
- Information Notice 1993-49, Improper Integration of Software Into Operating Practices (8 July 1993)
... further results |
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