Undervoltage Relay & Thermal Overload Setpoint ProblemsML031060586 |
Person / Time |
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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 |
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Issue date: |
12/21/1993 |
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From: |
Grimes B Office of Nuclear Reactor Regulation |
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To: |
|
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References |
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IN-93-099, NUDOCS 9312150073 |
Download: ML031060586 (12) |
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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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Category:NRC Information Notice
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Mclaughlin on NRC, Regarding NRC Information Notice 2006-13: Groundwater Contamination 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 December 21, 1993 NRC INFORMATION
NOTICE 93-99: UNDERVOLTAGE
RELAY AND THERMAL OVERLOAD SETPOINT PROBLEMS
Addressees
All holders of operating
licenses or construction
permits for nuclear power plants.
Purpose
The U.S. Nuclear Regulatory
Commission (NRC) is issuing this information
notice to alert addressees
to continuing
discoveries
of undervoltage
relay and thermal overload setpoints
that are set too low. 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.Background
In August 1976, the NRC wrote generic letters to all LWR licensees
regarding the need for licensees
to evaluate any generic implications
of several events at the Millstone
site involving
episodes of sustained
degraded grid voltage.On June 2, 1977, as part of multiplant
action MPA-23, the staff stated its position that all licensees
must have a second level of undervoltage
protection
with a time delay. (During degraded grid voltage episodes, undervoltage
relays and thermal overload protective
relays protect the safety equipment.)
In a generic letter dated August 8, 1979, the NRC requested
all licensees
to determine
the capability
of the offsite power system to operate all required loads within their voltage ratings under all conditions
within their design basis. The licensees
reviewed their undervoltage
relay setpoints on each of these occasions.
In 1981, the NRC issued Branch Technical Position, Power System Branch-1, "Adequacy
of Station Electric Distribution
System Voltages," which discussed, among other things, the addition of a second undervoltage
relay with an associated
time delay. Between 1981 and 1992, the NRC issued two information
notices, in which it discussed undervoltage
relay setpoints
and other concerns: 1. IN 84-02, "Operating
a Nuclear Power Plant at Voltage Levels Lower than Analyzed," issued January 10, 1984.2. IN 91-29, "Deficiencies
Identified
During Electrical
Distribution
System Functional
Inspections," issued April 15, 1991.9312150073 PDR E No4tEC 93-0 1 e ' , t
IN 93-99 December 21, 1993 3. IN 91-29, Supplement
1, TDeficiencies
Identified
During
--"VIN 93-99 December 21, 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.Bran K. rimes, Director Division of Operating
Reactor Support Office of Nuclear Reactor Regulation
Technical
contact: C. Morris, NRR (301) 504-2778 Attachments:
1. Representative
List of Undervoltage
Relay Setpoint Revisions
1988-1993 2. List of Recently Issued NRC Information
Notices
Attachment
1 IN 93-99 December 21, 1993 Representative
List of Undervoltaqe
Relay Set Point Revision Notifications
and Technical
Specification
Change Proposals
for 1988-1993 Event Notification
Number Licensee Event Notification
Date 11374 14043 00000 14780 16540 17121 Pilgrim Pilgrim Pilgrim 1 1 1 January 30, 1988 November 18, 1988 June 30, 1988 1 5 1 Cooper 1 Crystal River 3 Robinson 2 February 17, September
8, November 16, 1989 1989 1989 5 1 1 18322 18466 18892 19023 20021 Oconee 1, 2 and 3 McGuire 1 and 2 St. Lucie 2 Haddam Neck 1 Calvert Cliff 1 and 2 Ft. Calhoun Kewaunee 1 Salem 2 Dresden 2 and 3 Dresden 2 Zion 1 and 2 April 24, 1990 May 14, 1990 July 14, 1990 August 2, 1990 December 6, 1990 February 12, 1991 February 20, 1991 February 27, 1991 August 23, 1991 November 20, 1991 December 19, 1991 5 1 2 5 1 20435 20503 20542 21691 22281 22498 1 5 2 5 1 5 22580 22658 22847 (TOL)22918 23148 23191 23338 23365 23385 23439 (TOL)23452 23576 23784 23932 00000 24229 24384 Indian Point 3 Dresden 3 Washington
Nuclear 2 Washington
Nuclear 2 Vermont Yankee Quad Cities 1 and 2 LaSalle 1 and 2 LaSalle 2 Crystal River 3 Grand Gulf Comanche Peak 2 Crystal River 3 Zion 1 and 2 Byron 1 and 2 Callaway Crystal River 3 Dresden 2 and 3 January 9, 1992 January 22, 1992 February 19, 1992 March 1, 1992 April 1, 1992 April 7, 1992 April 27, 1992 April 29, 1992 May 1, 1992 May 11, 1992 May 13, 1992 June 4, 1992 July 2, 1992 July 24, 1992 July 23, 1992 September
14, 1992 October 6, 1992*TOL -Thermal Overload
Attachment
1 IN 93-99 December 21, 1993 Event Notification
Licensee Event Notification
Date Class Number 00000 Prairie Island 1 & 2 November 6, 1992 1 00000 St. Lucie 1 November 30, 1992 1 24757 Maine Yankee December 15, 1992 5 00000 Diablo Canyon 1 and 2 December 22, 1992 1 24845 Point Beach 1 and 2 January 7, 1993 1 25248 (TOL) Pilgrim March 29, 1993 5 25362 South Texas April 6, 1993 5 Events Notification
Number-00000
Licensees
whose undervoltage
relay setpoint notifications
to the NRC were reported by LERs, licensee letter, etc., and event notification
numbers if any, were not known.Class Definitions:
1. Undervoltage
Relay setpoints
were found to be incorrect
because of design errors.2. Undervoltage
Relay setpoints, as found, were not the same as required by the technical
specification.
3. Safety load circuit breaker thermal overloads
or other trip setpoints were too low because of design errors.4. Safety load circuit breaker thermal overload, or other trip setpoints, as found, were not the same as required by the technical
specification.
5. Membership
in one of the preceding
four classes could not be definitely
established
because of incomplete
information
in the event notification.
Att~ehment
2 IN 93-99 December 21, 1993 LIST OF RECENTLY ISSUED NRC INFORMATION
NOTICES Information
Date of Notice No. Subject Issuance Issued to 93-98 93-97 93-96 93-95 93-94 93-93 Motor Brakes on Valve Actuator Motors Failures of Yokes Installed
on Walworth Gate and Globe Valves Improper Reset Causes Emergency
Diesel Generator
Failures Storm-Related
Loss of Offsite Power Events due to Salt Buildup on Switchyard
Insulators
Unauthorized
Forced Entry into the Pro-tected Area at Three Mile Island Unit 1 on February 7, 1993 Inadequate
Control of Reactor Coolant System Conditions
During Shutdown Plant Improvements
to Mitigate Common Depend-encies in Component Cooling Water Systems Inadequate
Quality Assurance
Program of Vendor Supplying Safety-Related
Equipment 12/20/93 12/17/93 12/14/93 12/13/93 12/09/93 12/08/93 12/07/93 12/07/93 All holders of OLs and 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 located close to a large body of salt water.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 and all recipients
of NUREG-0040, 'License Con-tractor and Vendor Inspec-tion Status ReportR (White Book)..93-92 91-21, Supp. 1 OL -Operating
License CP = Construction
Permit
IN 93-99 December 21, 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.Odginal signed by Brian K. Grimes Brian K. Grimes, Director Division of Operating
Reactor Support Office of Nuclear Reactor Regulation
Technical
contact: C. Morris, NRR (301) 504-2778 Attachments:
1. Representative
List of Undervoltage
Relay Setpoint Revisions
1988-1993 2. List of Recently Issued NRC Information
Notices E plion: The stress laid by the initial reviewer on the licensees
and the staff should feel for such a preblem, viz. low UVR set points, has been all present IN.degree of concern that widespread
and persistent
but eliminated
from the (SEE PREVIOUS CONC.)*C.MORRIS 15 NOV. 93 (S/D)*SEE PREVIOUS CONCURRENCES
D/DORS:NRR
NCampbell
GHMarcus 07/30/93 08/10/93 12//$193*EELB:DE:NRR
CMorris 04/28/93*SC/EELB:DE:NRR
EWWeiss 95/19/93*C/EELB:DE:NRR
CHBerlinger
05/19/93*D/DE: NRR JTWiggins 07/23/93*RPB:ADM Tech Ed 07/13/93# Concurred
in electronically
by JMain.DOC NAME: 93-99.IN
IN 93-XX November XX, 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: C. Morris, NRR (301) 504-2778 Attachments:
1. Representative
List of Undervoltage
Relay Setpoint Revisions
1988-1993 2. List of Recently Issued NRC Information
Notices Exception:
The stress laid by the initial reviewer on the degree of concern that licensees
and the staff should feel for such a widespread
and persistent
problem, viz. low UVR set points, has been all but eliminated
from the present IN. G4'C.MORRIS 15 NOV. 93 Document Name: G:\SHARED\R3UNRELS.IN
- SEE PREVIOUS CONCURRENCES
- Concurred
in electronically
by D/DORS:NRR
- C/OGCB: DORS:NRR BKGrimes GHMarcus 11/ /93 A 08/10/93*C/EELB:DE:NRR
JTWiggins 05/19/93 07/23/93 JMain.*OGCB:DORS:NRR
NCampbell 07/30/93*RPB:ADM Tech Ed 07/13/93*EELB:DE:NRR
CMorris 04/28/93*SC/EELB:DE:NRR
EWWeiss 05/19/93&Wp: & 4 Lso1 IN 93-XX November XX, 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: C. Morris, NRR (301) 504-2778 Attachments:
1. Representative
List of Undervoltage
Relay Setpoint Revisions
1988-1993 2. List of Recently Issued NRC Information
Notices Document Name: G:\SHARED\R3UNRELS.IN
- SEE PREVIOUS CONCURRENCES
- Concurred
in D/DORS:NRR
BKGrimes ll/ /93*C/EELB:DE:NRR
CHBerlinger
05/19/93 electronically
by*C/OGCB:DWRS:NRR
GHMarcus 08/10/93*D/DE:NRR JTWiggins 07/23/93 JMain.*OGCB: DORS:NRR NCampbell 07/30/93*RPB:ADM Tech Ed 07/13/93*EELB:DE:NRR
CMorris 04/28/93*SC/EELB:DE:NRR
EWWeiss 05/19/93 IN 93-XX August XX, 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: C. Morris, NRR (301) 504-2778 Attachments:
1. Representative
List of Undervoltage
Relay Setpoint Revisions
1988-1993 2. List of Recently Issued NRC Information
Notices*SEE PREVIOUS CONCURRENCES
Document Name: UNRELSET.IN
DORS/OGCB NCampbell 07/30/93 D/DORS: BKGrime 08/ /93 C/OGCB: DORS:NRR GHMarcus6#/W
08/to /93*EELB:DE:NRR
CMorris 04/28/93*SC/EELB:DE:NRR
EWWeiss 05/19/93*C/EELB:DE:NRR
CHBerlinger
05/19/93*D/DE : NRR JTWiggins 07/23/93*RPB:ADM Tech Ed 07/13/93# Concurred
in electronically
by JMain.
IN 93-XX August XX, 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 Operational
Events Assessment
Office of Nuclear Reactor Regulation
Technical
contact: C. Morris, NRR (301) 504-2778 Attachments:
1. Representative
List of Undervoltage
Relay Setpoint Revisions
1988-1993 2. List of Recently Issued NRC Information
Notices*SEE PREVIOUS CONCURRENCES
Document Name: UNRELSET.IN
DRS/OGCB NCampbell 07/8* /93 D/DORS:NRR
BKGrimes 07/ /93 C/OGCB:DORS:NRR
GHMarcus 07/ /93*EELB:DE:NRR
CMorris 04/28/93*SC/EELB:DE:NRR
EWWeiss 05/19/93*C/EELB:DE:NRR
CHBerlinger
05/19/93*D/DE:NRR JTWiggins 07/23/93*RPB:ADM Tech Ed 07/13/93# Concurred
in electronically
by JMain.
_> K_> IN 93-XX July XX, 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 Operational
Events Assessment
Office of Nuclear Reactor Regulation
Technical
contact: C. Morris, NRR (301) 504-2778 Attachments:
1. Representative
List of Undervoltage
Relay Setpoint Revisions
1988-1993 2. List of Recently Issued NRC Information
Notices*SEE PREVIOUS CONCURRENCES
Document Name: UNRELSET.IN
DORS/OGCB
D NCampbell
BI 07/ /93 0,*C/EELB:DE:NRR
CHBerlinger
05/19/93/DORS:NRR KGrimes 7/ /24*EELB:DE:NRR
CMorris 04/28/93*SC/EELB:DE:NRR
EWWeiss 05/19/93 Marcus T/ /93*RPB:ADM Tech Ed 07/13/93# Concurred
in electronically
by JMain.
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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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