Observations from Recent Shutdown Risk and Outage Management Pilot Team InspectionsML031070092 |
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 ![Entergy icon.png](/w/images/7/79/Entergy_icon.png) |
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Issue date: |
09/14/1993 |
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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-93-072, NUDOCS 9309090243 |
Download: ML031070092 (8) |
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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>. |
Ku UNITED STATES NUCLEAR REGULATORY
COMMISSION
OFFICE OF NUCLEAR REACTOR REGULATION
WASHINGTON, D.C. 20555 September
14, 1993 NRC INFORMATION
NOTICE 93-72: OBSERVATIONS
FROM RECENT SHUTDOWN RISK AND OUTAGE MANAGEMENT
PILOT TEAM INSPECTIONS
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 inform addressees
of observations
from recent shutdown risk and outage management
pilot team inspections.
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
Events that occurred during the past several years have caused the NRC staff to be increasingly
concerned
about plant safety during shutdown operations.
The Diablo Canyon event of April 10, 1987, in which boiling of the reactor coolant resulted from a loss of decay heat removal, highlighted
the fact that operation
of a pressurized-water
reactor with a reduced reactor coolant system (RCS) inventory
is a particularly
sensitive
condition.
Based on its review of that event, the staff issued Generic Letter 88-17, "Loss of Decay Heat Removal," October 17, 1988, which requested
that licensees
address certain generic deficiencies
to improve safety during operations
with a reduced RCS inventory.
More recently, Incident Investigation
Team report, NUREG-1410,"Loss of Vital ac Power and the Residual Heat Removal System During Mid-Loop Operations
at Plant Vogtle Unit 1 on March 20, 1990," emphasized
the need for risk management
of shutdown operations.
Discussions
with foreign regulatory
organizations
support NRC staff findings that the core-damage-frequency
for shutdown operations
may be a substantial
fraction of the total core-damage
frequency.
Description
of Circumstances
Between December 1991 and April 1993, the NRC staff conducted
five pilot team inspections
to assess the effectiveness
of industry initiatives
for improving shutdown safety. The inspections
were performed
at Oconee Nuclear Station, Unit 2 [NRC Inspection
Report (IR) 50-270/91-202], Indian Point Nuclear 9309090243
-U 1?-.crn-9
.3 IN 93-72 September
14, 1993 Generating
Station, Unit 3 (IR 50-286/92-901), Diablo Canyon Nuclear Station, Unit 1 (IR 50-275/92-201), Prairie Island Nuclear Generating
Plant, Units 1 and 2 (IR 50-282/92-201;
50-306/92-201), and Cooper Nuclear Station (IR 50-298/93-201).
Approximately
one week of each inspection
focused on licensee pre-outage
planning and control processes
and 8 to 10 days focused on licensee implementation
of the outage.In the pre-outage
portion of the inspection, the inspectors
evaluated
the following:
(1) management
involvement
in and oversight
of the outage planning process, (2) planning and scheduling
of outage activities, especially
the relationships
between significant
work activities
and the availability
of electrical
power supplies, decay heat removal systems, reactor coolant system RCS inventory
and containment
integrity, (3) the process for developing
individual
work packages to ensure coordination
with other activities, and (4)operator response procedures, contingency
plans and training for mitigation
of loss of decay heat removal capability, loss of RCS inventory
and loss of electrical
power sources during shutdown conditions.
The inspectors
walked through procedures
related to shutdown safety to determine
if the specified
activities
could be accomplished
in the allotted time frames and to verify that the procedures
could be implemented
considering
probable equipment
availability.
The inspectors
reviewed training records on outage procedures
to determine
if the training was adequate and that, when appropriate, additional
training was provided as the procedures
were revised.The inspectors
also evaluated
the probable effects of environmental
conditions
such as temperature, steam and flooding on the performance
of activities
that would be required to mitigate adverse shutdown events.In the implementation
portion of the inspection, the inspectors
evaluated:
(1) the control of changes to the outage schedule, control of work activities, and control of system alignments, (2) the working relationships
and communication
channels between operations, maintenance
and other plant support personnel, (3) the conduct of operations
personnel
both inside and outside of the control room regarding
awareness
of plant status, control of plant evolutions, response to alarms and other abnormal indications, (4) the completeness
and effectiveness
of shift turnovers, (5) whether maintenance
and modification
work was performed
in accordance
with current written and approved procedures
and appropriate
post-maintenance
testing was required and performed, and (6) the adequacy of management
involvement
and oversight
of the conduct of the outage as it progressed.
Other areas observed were, plant housekeeping, normal and emergency
plant lighting, configuration
control, radiological
controls, equipment
labeling and status tagging, vital area access control, use of overtime and licensee control of contractor
work including
contractor
training and qualifications.
Discussion
In general, the inspectors
found that licensees
had instituted
programmatic
changes developed
from guidance contained
in a Nuclear Management
and Resources
Council document, NUMARC 91-06, "Guidelines
for Industry Actions to
TV IN 93-72 September
14, 1993 Assess Shutdown Management." The team inspectors
found individual
examples of licensee failure to follow procedures
but more importantly
the inspectors
identified
two areas of more general concern: (1) risk assessment
for pre-outage
planning, emergent work and schedule changes, and (2)implementation
of defense-in-depth
methodologies
for equipment
availability.
A general discussion
of these areas is provided below. Specific details of the findings are contained
in the inspection
reports referenced
above.Risk Assessment
for Pre-Outage
Planning, Emergent Work and Schedule Changes The inspectors
found that licensees
used various programmatic
controls to assess shutdown risk factors during initial outage planning, emergent work and schedule changes. Assessment
methodologies
used for initial outage planning ranged from following
minimum guidelines
for equipment
availability
to performing
a probabilistic
risk assessment
of scheduled
outage activities.
The inspection
team found that the risk assessment
aided the licensee in identifying
activities
that would be subject to high risk during the sched led outage. However, as the outage progressed, the risk assessment
became less valid because it was not updated as changes to the outage schedule occurreda In the areas of emergent work and schedule changes, the inspectors
found that three of the plants had a proceduralized
process to assess the effect of \emergent work or schedule changes on plant risk. The other two plants relied on a functional
review by planners, schedulers, and operators
to adjust the schedule appropriately
to reduce risk.The inspectors
found that all of the plants maintained
status boards or checklists
in the control room to assist the operators
in tracking the configuration
status of plant systems and to help identify potential risk-significant
activities.
Implementation
of Defense-in-Depth
for Equipment
Availability
The inspection
teams found that licensee implementation
of defense-in-depth
for equipment
availability
was inconsistent.
Although industry guidelines
for declaring
equipment "available" exist, the inspectors
found that the criteria for declaring
equipment
needed to ensure an appropriate
margin of safety"available" varied from licensee to licensee.
For example, declaring
that equipment
was "available" did not always include ensuring that support systems (e.g., cooling water and heating, ventilation
and air conditioning)
were also available.
At times, after maintenance
had been performed, equipment
was listed as "available" without the benefit of a post-maintenance
functional
test. The inspectors
also found that some equipment
was considered
to be"available" even though actions, such as removal of clearances
or realignment
of valves, would be required before the equipment
could perform its function.In addition to the above concerns, at most of the plants the team inspectors
found examples of failures to comply with technical
specification
restrictions
on overtime work in that management
approval to exceed overtime limits was inadequately
documented.
K-, 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: J.D. Wilcox, NRR (301) 504-1262 Attachment:
List of Recently Issued NRC Information
Notices RSIB:DRIL:NRR
JDWilcox 07/02/93 RPB:ADM NBeeson 08/10/93 RSIB:DRIL:NRR
SSanders 07/02/93 OGCB:DORS:NRR
JLBirmingham
08 /1/ 93 J9 AC/RSIB:DRIL:NRR
DNorkin 07/02/93 C70MO:DORS:NRR
iGHMarcus PT ;S/Al/93 D/DRIL:NRR
CERossi 07/10/93 D/DORS:NRR
BKGrimes 09/ /93 RSIB:DRIL:NRR
PSKoltay 07/06/93
-IN 93-xx September
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: J.D. Wilcox, NRR (301) 504-1262 Attachment:
List of Recently Issued NRC Information
Notices*SEE PREVIOUS CONCURRENCE
JDWilcox SSanders 07/02/93 07/02/93*AC/RSIB:DRIL:NRR
DNorkin 07/02/93> C/OGCB:DORS:NRR
GHMarcus/Wen
08/27/93*D/DRIL:NRR
CERossi 07/10/93 D/DORS:NRR
BKGrimes 09/ /93*RPB:ADM NBeeson 08/10/93*OGCB:DORS:NRR
JLBirmingham
08/27/93*RSIB:DRIL:NRR
PSKoltay 07/06/93 DOCUMENT NAME: OUTAGEIN.JLB
'-vJ IN 93-72 September
14, 1993 Based on the five pilot inspections, the NRC inspection
teams concluded
that NRC actions and industry initiatives
have increased
licensee awareness
of the risk associated
with shutdown and low power conditions.
The inspection
teams found that licensees
were aware of the necessity
for ensuring that required systems be available
and of the need to maintain the capability
of backup equipment
during an outage. However, the inspection
teams found that licensee interpretations
of industry initiatives
for addressing
shutdown risk varied greatly. This was demonstrated
by the various licensee interpretations
of industry guidelines
for declaring
equipment "available." This information
notice requires no specific action or written response.
If you have any questions
about the information
in this notice, please contact the technical
contact listed below or the appropriate
Office of Nuclear Reactor Regulation (NRR) project manager.Original signed by Brian K. Grimes Brian K. Grimes, Director Division of Operating
Reactor Support Office of Nuclear Reactor Regulation
Technical
contact: J.D. Wilcox, NRR (301) 504-1262 Attachment:
List of Recently Issued NRC Information
Notices*SEE PREVIOUS CONCURRENCE
JDWilcox SSanders 07/02/93 07/02/93*AC/RSIB:DRIL:NRR
DNorkin 07/02/93*C/OGCB:DORS:NRR
GHMarcus/Wen
08/27/93*D/DRIL:NRR
CERossi 07/1 dJ3 (qy*RPB:ADM NBeeson 08/10/93*OGCB:DORS:NRR
JLBirmingham
08/27/93*RSIB:DRIL:NRR
PSKoltay 07/06/93 DOCUMENT NAME: 93-72.IN
IN 93-72 September
14, 1993 Based on the five pilot inspections, the NRC inspection
teams concluded
that NRC actions and industry initiatives
have increased
licensee awareness
of the risk associated
with shutdown and low power conditions.
The inspection
teams found that licensees
were aware of the necessity
for ensuring that required systems be available
and of the need to maintain the capability
of backup equipment
during an outage. However, the inspection
teams found that licensee interpretations
of industry initiatives
for addressing
shutdown risk varied greatly. This was demonstrated
by the various licensee interpretations
of industry guidelines
for declaring
equipment "available." 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.C-Brian K. Grimes, Director Division of Operating
Reactor Support Office of Nuclear Reactor Regulation
Technical
contact: J.D. Wilcox, NRR (301) 504-1262 Attachment:
List of Recently Issued NRC Information
Notices
KJ Attachment
IN 93-72 September
14, 1993 LIST OF RECENTLY ISSUED NRC INFORMATION
NOTICES Information
Date of Notice No. Subject Issuance Issued to 93-71 93-70 93-69 93-68 92-16, Supp. 2 93-67 93-66 93-65 Fire at Chernobyl
Unit 2 Degradation
of Boraflex Neutron Absorber Coupons Radiography
Events at Operating
Power Reactors Failure of Pump Shaft Coupling Caused by Temper Embrittlement
during Manufacture
Loss of Flow from the Residual Heat Removal Pump during Refueling Cavity Draindown Bursting of High Pressure Coolant Injection
Steam Line Rupture Discs Injures Plant Personnel Switchover
to Hot-Leg Injection
Following A Loss-of-Coolant
Accident in Pres-surized Water Reactors Reactor Trips Caused by Breaker Testing with Fault Protection
Bypassed 09/13/93 09/10/93 09/02/93 09/01/93 08/23/93 08/16/93 08/16/93 08/13/93 All holders of OLs or CPs for nuclear power reactors.All holders of OLs or CPs for nuclear power reactors.All holders of OLs or CPs for nuclear power reactors and all radiography
licensees.
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 pressurized
water reactors.All holders of OLs or CPs for nuclear power reactors.OL = Operating
License CP = Construction
Permit
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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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