United States Nuclear Regulatory Commission - Protecting People and the Environment

Information Notices - 1991

File Name Date Description
in91050s1 07/17/1997 Water Hammer Events Since 1991 – Supplement 1
in91085r1 02/27/1997 Potential Failures of Thermostatic Control Valves for Diesel Generator Jacket Cooling Water – Revision 1
in91029s3 11/22/1995 Deficiencies Identified During Electrical Distribution System Functional Inspections – Supplement 3
in91029s2 12/22/1993 Potential Deficiencies Found During Electrical Distribution System Functional Inspections – Supplement 2
in91079s1 08/04/1994 Deficiencies Found in Thermo-Lag Fire Barrier Installation – Supplement 1
in91045s1 07/29/1994 Possible Malfunction of Westinghouse ARD, BFD, and NBFD Relays, and A200 DC and DPC 250 Magnetic Contactors – Supplement 1
in91081s1 05/19/1994 Switchyard Problems that Contribute to Loss of Offsite Power – Supplement 1
in91021s1 12/07/1993 Inadequate Quality Assurance Program of Vendor Supplying Safety-Related Equipment – Supplement 1
in91064s1 10/07/1992 Site Area Emergency Resulting from a Loss of Non-Class 1E Uninterruptable Power Supplies – Supplement 1
in91029s1 09/14/1992 Deficiencies Identified During Electrical Distribution System Functional Inspections – Supplement 1
in91052s1 07/16/1992 Nonconservative Errors in Overtemperature Delta-Temperature (OTdT) Setpoint Caused by Improper Gain Setting – Supplement 1
in91087 12/27/1991 Hydrogen Embrittlement of Raychem Cryofit Couplings
in91086 12/27/1991 New Reporting Requirements for Contamination Events at Medical Facilities (10 CFR 30.50)
in91085 12/26/1991 Potential Failures of Thermostatic Control Valves for Diesel Generator Jacket Cooling Water
in91084 12/26/1991 Problems with Criticality Alarm Components/Systems
in91083 12/20/1991 Solenoid-Operated Valve Failures Resulted in Turbine Overspeed
in91018s1 12/18/1991 High-Energy Piping Failures Caused by Wall Thinning – Supplement 1
in91082 12/18/1991 Problems with Diaphragms in Safety-Related Tanks
in91081 12/16/1991 Switchyard Problems that Contribute to Loss of Offsite Power
in91080 12/11/1991 Failure of Anchor Head Threads on Post-Tensioning System During Surveillance Inspection
in91079 12/06/1991 Deficiencies in the Procedures for Installing Thermo-Lag Fire Barrier Materials
in91078 11/28/1991 Status Indication of Control Power for Circuit Breakers Used in Safety-Related Applications
in91077 11/26/1991 Shift Staffing at Nuclear Power Plants
in91076 11/26/1991 10 CFR Parts 21 and 50.55(e) Final Rules
in91075 11/25/1991 Static Head Corrections Mistakenly Not Included in Pressure Transmitter Calibration Procedures
in91074 11/25/1991 Changes in Pressurizer Safety Valve Setpoints Before Installation
in91073 11/21/1991 Loss of Shutdown Cooling During Disassembly of High Pressure Safety Injection System Check Valve
in91072 11/19/1991 Issuance of a Revision to the EPA Manual of Protective Action Guides and Protective Actions for Nuclear Incidents
in91071 11/12/1991 Training and Supervision of Individuals Supervised by an Authorized User
in91070 11/04/1991 Improper Installation of Instrumentation Modules
in91069 11/01/1991 Errors in Main Steam Line Break Analyses for Determining Containment Parameters
in91068 10/28/1991 Careful Planning Significantly Reduces the Potential Adverse Impacts of Loss of Offsite Power Events During Shutdown
in91067 10/21/1991 Problems with the Reliable Detection of Intergranular Attack (IGA) of Steam Generator Tubing
in91066 10/18/1991 (1) Erroneous Data in ... NUREG/CR-0095 and (2) Thermal Scattering Data Limitation ... KENO and SCALE Codes
in91065 10/16/1991 Emergency Access to Low-Level Radioactive Waste Disposal Facilities
in91064 10/09/1991 Site Area Emergency Resulting from a Loss of Non-Class 1E Uninterruptible Power Supplies
in91063 10/03/1991 Natural Gas Hazards at Fort St. Vrain Nuclear Generating Station
in91062 09/30/1991 Diesel Engine Damage Caused by Hydraulic Lockup Resulting from Fluid Leakage into Cylinders
in91061 09/30/1991 Preliminary Results of Validation Testing of Motor-Operated Valve Diagnostic Equipment
in91060 09/24/1991 False Alarms of Alarm Ratemeters Because of Radiofrequency Interference
in91059 09/23/1991 Problems with Access Authorization Programs
in91058 09/20/1991 Dependency of Offset Disc Butterfly Valve's Operation on Orientation with Respect to Flow
in91057 09/19/1991 Operational Experience on Bus Transfers
in91056 09/19/1991 Potential Radioactive Leakage to Tank Vented to Atmosphere
in91055 09/16/1991 Failures Caused by an Improperly Adjusted Test Link in 4.16 KV General Electric Switchgear
in91054 09/06/1991 Foreign Experience Regarding Boron Dilution
in91053 09/04/1991 Failure of Remote Shutdown System Instrumentation Because of Incorrectly Installed Components
in91052 08/29/1991 Nonconservative Errors in Overtemperature Delta-Temperature (OTdT) Setpoint Caused by Improper Gain Settings
in91051 08/20/1991 Inadequate Fuse Control Programs
in91050 08/20/1991 A Review of Water Hammer Events After 1985
in91049 08/15/1991 Enforcement of Safety Requirements for Radiographers
in91048 08/09/1991 False Certificates of Conformance Provided by Westinghouse Electric Supply Company for Commercial-Grade Circuit Breakers
in91047 08/06/1991 Failure of Thermo-Lag Fire Barrier Material to Pass Fire Endurance Test
in91046 07/18/1991 Degradation of Emergency Diesel Generator Fuel Oil Delivery Systems
in91043 07/05/1991 Recent Incidents Involving Rapid Increases in Primary-to-Secondary Leak Rate
in91044 07/08/1991 Improper Control of Chemicals in Nuclear Fuel Fabrication
in91045 07/05/1991 Possible Malfunction of Westinghouse ARD, BFD, and NBFD Relays, and A200 DC and DPC 250 Magnetic Contactors
in91042 06/27/1991 Plant Outage Events Involving Poor Coordination Between Operations and Maintenance Personnel During Valve Testing and Manipulations
in91041 06/27/1991 Potential Problems with the Use of Freeze Seals
in91040 06/19/1991 Contamination of Nonradioactive System and Resulting Possibility for Unmonitored, Uncontrolled Release to Environment
in91039 06/17/1991 Compliance with 10 CFR Part 21, "Reporting of Defects and Noncompliance"
in91038 06/13/1991 Thermal Stratification in Feedwater System Piping
in91037 06/10/1991 Compressed Gas Cylinder Missile Hazards
in91036 06/10/1991 Nuclear Plant Staff Working Hours
in91035 06/07/1991 Labeling Requirements for Transporting Multi-Hazard Radioactive Materials
in91034 06/03/1991 Potential Problems in Identifying Causes of Emergency Diesel Generator Malfunctions
in91033 05/31/1991 Reactor Safety Information for States During Exercises and Emergencies
in91032 05/15/1991 Possible Flaws in Certain Piping Systems Fabricated by Associated Piping and Engineering
in91031 05/09/1991 Nonconforming Magnaflux Magnetic Particle (14AM) Prepared Bath
in91030 04/23/1991 Inadequate Calibration of TLDs Utilized to Monitor Extremity Dose at Uranium Processing and Fabrication Facilities
in91029 04/15/1991 Deficiencies Identified During Electrical Distribution System Functional Inspections
in91028 04/15/1991 Cracking in Feedwater System Piping
in91027 04/10/1991 Incorrect Rotation of Positive Displacement Pump
in91026 04/02/1991 Potential Nonconservative Errors ... Working Format Hansen-Roach Cross-Section Set Provided with the KENO and SCALE Codes
in91025 04/01/1991 Commercial-Grade Structural Framing Components Supplied as Nuclear Safety-Related Equipment
in91024 03/26/1991 Recent Operating Experience Involving Reactor Operation Without a Licensed RO or SRO Present in the Control Room
in91023 03/26/1991 Accidental Radiation Overexposures to Personnel Due to Industrial Radiography Accessory Equipment Malfunctions
in91022 03/19/1991 Four Plant Outage Events Involving Loss of AC Power or Coolant Spills
in91021 03/19/1991 Inadequate Quality Assurance Program of Vendor Supplying Safety-Related Equipment
in91021 03/19/1991 Inadequate Quality Assurance Program of Vendor Supplying Safety-Related Equipment
in91020 03/19/1991 Electrical Wire Insulation Degradation Caused Failure in a Safety-Related Motor Control Center
in91021 03/19/1991 Inadequate Quality Assurance Program of Vendor Supplying Safety-Related Equipment
in91019 03/12/1991 Steam Generator Feedwater Distribution Piping Damage
in91018 03/12/1991 High-Energy Piping Failures Caused by Wall Thinning
in91017 03/11/1991 Fire Safety of Temporary Installations or Services
in91016 03/06/1991 Unmonitored Release Pathways from Slightly Contaminated Recycle and Recirculation Water Systems at a Fuel Facility
in91015 03/06/1991 Incorrect Configuration of Breaker Operating Springs in General Electric AK-Series Metal-Clad Circuit Breakers
in91014 03/05/1991 Recent Safety-Related Incidents at Large Irradiators
in91013 03/04/1991 Inadequate Testing of Emergency Diesel Generators (EDGs)
in91011 02/20/1991 Inadequate Physical Separation and Electrical Isolation of Non-Safety-Related Circuits From RPS Circuits
in91012 02/15/1991 Potential Loss of Net Positive Suction Head (NPSH) of Standby Liquid Control System Pumps
in91010 02/12/1991 Summary of Semiannual Program Performance Reports on Fitness-for-Duty (FFD) in the Nuclear Industry
in91009, rev. 1 09/25/2007 Counterfeiting of Crane Valves
in91009 02/05/1991 See in91009, rev 1
in91008 02/05/1991 Medical Examination for Licensed Operators
in91007 02/04/1991 Maintenance Deficiency Associated with General Electric Horizontal Custom 8000 Induction Motors
in91006 01/31/1991 Lock-Up of Emergency Diesel Generator and Load Sequencer Control Circuits Preventing Restart of Tripped EDG
in91005 01/30/1991 Intergranular Stress Corrosion Cracking in Pressurized Water Reactor Safety Injection Accumulator Nozzles
in91004 01/28/1991 Reactor Scram Following Control Rod Withdrawal Associated with Low Power Turbine Testing
in91003 01/07/1991 Management of Wastes Contaminated with Radioactive Materials ("Red Bag" Waste and Ordinary Trash)
in91002 01/07/1991 Brachytherapy Source Management
in91001 01/04/1991 Supplier of Misrepresented Resistors
Page Last Reviewed/Updated Tuesday, November 12, 2013