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Category:NRC Information Notice
MONTHYEARInformation Notice 1991-09, Counterfeiting of Crane Valves2007-09-25025 September 2007
Counterfeiting of Crane Valves
Information Notice 2007-28, Potential Common Cause Vulnerabilities in Essential Service Water Systems Due to Inadequate Chemistry Controls2007-09-19019 September 2007
Potential Common Cause Vulnerabilities in Essential Service Water Systems Due to Inadequate Chemistry Controls
Information Notice 2006-04, Design Deficiency in Pressurizer Heaters for Pwrs2006-02-13013 February 2006
Design Deficiency in Pressurizer Heaters for Pwrs
Information Notice 2006-04, Design Deficiency in Pressurizer Heaters for PWRs2006-02-13013 February 2006
Design Deficiency in Pressurizer Heaters for PWRs
Information Notice 2005-15, Three-Unit Trip and Loss of Offsite Power at Palo Verde Nuclear Generating Station2005-06-0101 June 2005
Three-Unit Trip and Loss of Offsite Power at Palo Verde Nuclear Generating Station
Information Notice 1999-28, Recall of Star Brand Fire Protection Sprinkler Heads1999-09-30030 September 1999
Recall of Star Brand Fire Protection Sprinkler Heads
Information Notice 1999-27, Malfunction of Source Retraction Mechanism in Cobalt-60 Teletherapy Treatment Units1999-09-0202 September 1999
Malfunction of Source Retraction Mechanism in Cobalt-60 Teletherapy Treatment Units
Information Notice 1999-26, Safety and Economic Consequences of Misleading Marketing Information1999-08-24024 August 1999
Safety and Economic Consequences of Misleading Marketing Information
Information Notice 1999-25, Year 2000 Contingency Planning Activities1999-08-10010 August 1999
Year 2000 Contingency Planning Activities
Information Notice 1999-24, Broad-Scope Licensees' Responsibilities for Reviewing and Approving Unregistered Sealed Sources and Devices1999-07-12012 July 1999
Broad-Scope Licensees' Responsibilities for Reviewing and Approving Unregistered Sealed Sources and Devices
Information Notice 1999-23, Safety Concerns Related to Repeated Control Unit Failures of the Nucletron Classic Model High-Dose-Rate Remote Afterloading Brachytherapy Devices1999-07-0606 July 1999
Safety Concerns Related to Repeated Control Unit Failures of the Nucletron Classic Model High-Dose-Rate Remote Afterloading Brachytherapy Devices
Information Notice 1999-20, Contingency Planning for the Year 2000 Computer Problem1999-06-25025 June 1999
Contingency Planning for the Year 2000 Computer Problem
Information Notice 1999-21, Recent Plant Events Caused by Human Performance Errors1999-06-25025 June 1999
Recent Plant Events Caused by Human Performance Errors
Information Notice 1999-22, 10CFR 34.43(a)(1); Effective Date for Radiographer Certification and Plans for Enforcement Discretion1999-06-25025 June 1999
10CFR 34.43(a)(1); Effective Date for Radiographer Certification and Plans for Enforcement Discretion
Information Notice 1999-19, Rupture of the Shell Side of a Feedwater Heater at the Point Beach Nuclear Plant1999-06-23023 June 1999
Rupture of the Shell Side of a Feedwater Heater at the Point Beach Nuclear Plant
Information Notice 1999-18, Update on Nrc'S Year 2000 Activities for Material Licensees and Fuel Cycle Licensees and Certificate Holders1999-06-14014 June 1999
Update on Nrc'S Year 2000 Activities for Material Licensees and Fuel Cycle Licensees and Certificate Holders
Information Notice 1999-17, Problems Associated with Post-Fire Safe-Shutdown Circuit Analyses1999-06-0303 June 1999
Problems Associated with Post-Fire Safe-Shutdown Circuit Analyses
Information Notice 1999-16, Federal Bureau of Investigation'S Nuclear Site Security Program1999-05-28028 May 1999
Federal Bureau of Investigation'S Nuclear Site Security Program
Information Notice 1999-15, Misapplication for 10CFR Part 71 Transportation Shipping Cask Licensing Basis to 10CFR Part 50 Design Basis1999-05-27027 May 1999
Misapplication for 10CFR Part 71 Transportation Shipping Cask Licensing Basis to 10CFR Part 50 Design Basis
Information Notice 1999-14, Unanticipated Reactor Water Draindown at Quad Cities Unit 2, Arkansas Nuclear One Unit 2, & FitzPatrick1999-05-0505 May 1999
Unanticipated Reactor Water Draindown at Quad Cities Unit 2, Arkansas Nuclear One Unit 2, & FitzPatrick
Information Notice 1999-13, Insights from NRC Inspections of Low-and Medium-Voltage Circuit Breaker Maintenance Programs1999-04-29029 April 1999
Insights from NRC Inspections of Low-and Medium-Voltage Circuit Breaker Maintenance Programs
Information Notice 1999-12, Year 2000 Computer Systems Readiness Audits1999-04-28028 April 1999
Year 2000 Computer Systems Readiness Audits
Information Notice 1999-11, Incidents Involving the Use of Radioactive Iodine-1311999-04-16016 April 1999
Incidents Involving the Use of Radioactive Iodine-131
Information Notice 1999-08, Urine Specimen Adulteration1999-03-26026 March 1999
Urine Specimen Adulteration
Information Notice 1999-09, Problems Encountered When Manually Editing Treatment Data on the Nucletron Microselectron-HDR (New) Model 105-9991999-03-24024 March 1999
Problems Encountered When Manually Editing Treatment Data on the Nucletron Microselectron-HDR (New) Model 105-999
Information Notice 1999-07, Failed Fire Protection Deluge Valves & Potential Testing Deficiencies in Preaction Sprinkler Systems1999-03-22022 March 1999
Failed Fire Protection Deluge Valves & Potential Testing Deficiencies in Preaction Sprinkler Systems
Information Notice 1999-06, 1998 Enforcement Sanctions as a Result of Deliberate Violations of NRC Employee Protection Requirements1999-03-19019 March 1999
1998 Enforcement Sanctions as a Result of Deliberate Violations of NRC Employee Protection Requirements
Information Notice 1999-06, 1998 Enforcement Sanctions As a Result of Deliberate Violations of NRC Employee Protection Requirements1999-03-19019 March 1999
1998 Enforcement Sanctions As a Result of Deliberate Violations of NRC Employee Protection Requirements
Information Notice 1999-05, Inadvertent Discharge of Carbon Dioxide Fire Protection System and Gas Migration1999-03-0808 March 1999
Inadvertent Discharge of Carbon Dioxide Fire Protection System and Gas Migration
Information Notice 1999-04, Unplanned Radiation Exposures to Radiographers, Resulting from Failures to Follow Proper Radiation Safety Procedures1999-03-0101 March 1999
Unplanned Radiation Exposures to Radiographers, Resulting from Failures to Follow Proper Radiation Safety Procedures
Information Notice 1999-03, Exothermic Reactors Involving Dried Uranium Oxide Powder (Yellowcake)1999-01-29029 January 1999
Exothermic Reactors Involving Dried Uranium Oxide Powder (Yellowcake)
Information Notice 1999-02, Guidance to Users on the Implementation of a New Single-Source Dose-Calculation Formalism and Revised Air-Kerma Strength Standard for Iodine-125 Sealed Sources1999-01-21021 January 1999
Guidance to Users on the Implementation of a New Single-Source Dose-Calculation Formalism and Revised Air-Kerma Strength Standard for Iodine-125 Sealed Sources
Information Notice 1999-01, Deterioration of High-Efficiency Particulate Air Filters in a Pressurized Water Reactor Containment Fan Cooler Unit1999-01-20020 January 1999
Deterioration of High-Efficiency Particulate Air Filters in a Pressurized Water Reactor Containment Fan Cooler Unit
Information Notice 1998-45, Cavitation Erosion of Letdown Line Orifices Resulting in Fatigue Cracking of Pipe Welds1998-12-15015 December 1998
Cavitation Erosion of Letdown Line Orifices Resulting in Fatigue Cracking of Pipe Welds
Information Notice 1998-44, Ten-Year Inservice Inspection (ISI) Program Update for Licensees That Intend to Implement Risk-Informed ISI of Piping1998-12-10010 December 1998
Ten-Year Inservice Inspection (ISI) Program Update for Licensees That Intend to Implement Risk-Informed ISI of Piping
Information Notice 1998-43, Leaks in Emergency Diesel Generator Lubricating Oil & Jacket Cooling Water Piping1998-12-0404 December 1998
Leaks in Emergency Diesel Generator Lubricating Oil & Jacket Cooling Water Piping
Information Notice 1998-42, Implementation of 10 CFR 55.55a(g) Inservice Inspection Requirements1998-12-0101 December 1998
Implementation of 10 CFR 55.55a(g) Inservice Inspection Requirements
Information Notice 1998-41, Spurious Shutdown of Emergency Diesel Generators From Design Oversight1998-11-20020 November 1998
Spurious Shutdown of Emergency Diesel Generators From Design Oversight
Information Notice 1998-41, Spurious Shutdown of Emergency Diesel Generators from Design Oversight1998-11-20020 November 1998
Spurious Shutdown of Emergency Diesel Generators from Design Oversight
Information Notice 1998-39, Summary of Fitness-for-Duty Program Performance Reports for Calendar Years 1996 and 19971998-10-30030 October 1998
Summary of Fitness-for-Duty Program Performance Reports for Calendar Years 1996 and 1997
Information Notice 1998-40, Design Deficiencies Can Lead to Reduced ECCS Pump Net Positive Suction Head During Design-Basis Accidents1998-10-26026 October 1998
Design Deficiencies Can Lead to Reduced ECCS Pump Net Positive Suction Head During Design-Basis Accidents
Information Notice 1990-66, Incomplete Draining and Drying of Shipping Casks1998-10-25025 October 1998
Incomplete Draining and Drying of Shipping Casks
Information Notice 1998-38, Metal-Clad Circuit Breaker Maintenance Issues Identified by NRC Inspections1998-10-15015 October 1998
Metal-Clad Circuit Breaker Maintenance Issues Identified by NRC Inspections
Information Notice 1998-37, Eligibility of Operator License Applicants1998-10-0101 October 1998
Eligibility of Operator License Applicants
Information Notice 1998-36, Inadequate or Poorly Controlled, Non-Safety-Related Maintenance Activities Unnecessarily Challenged Safety Systems1998-09-18018 September 1998
Inadequate or Poorly Controlled, Non-Safety-Related Maintenance Activities Unnecessarily Challenged Safety Systems
Information Notice 1998-34, Configuration Control Errors1998-08-28028 August 1998
Configuration Control Errors
Information Notice 1998-33, NRC Regulations Prohibit Agreements That Restrict or Discourage an Employee from Participating in Protected Activities1998-08-28028 August 1998
NRC Regulations Prohibit Agreements That Restrict or Discourage an Employee from Participating in Protected Activities
Information Notice 1998-31, Fire Protection System Design Deficiencies and Common-Mode Flooding of Emergency Core Cooling System Rooms at Washington Nuclear Project Unit 21998-08-18018 August 1998
Fire Protection System Design Deficiencies and Common-Mode Flooding of Emergency Core Cooling System Rooms at Washington Nuclear Project Unit 2
Information Notice 1998-30, Effect of Year 2000 Computer Problem on NRC Licensees and Certificate Holders1998-08-12012 August 1998
Effect of Year 2000 Computer Problem on NRC Licensees and Certificate Holders
Information Notice 1998-29, Predicted Increase in Fuel Rod Cladding Oxidation1998-08-0303 August 1998
Predicted Increase in Fuel Rod Cladding Oxidation
2007-09-25
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UNITED STATESNUCLEAR REGULATORY COMMISSIONOFFICE OF NUCLEAR REACTOR REGULATIONWASHINGTON, D.C. 20555February 13, 2006NRC INFORMATION NOTICE 2006-04: DESIGN DEFICIENCY IN PRESSURIZERHEATERS FOR PRESSURIZED-WATER REACTORS
ADDRESSEES
All holders of operating licenses for pressurized-water reactors, except those who havepermanently ceased operations and have certified that fuel has been permanently removed from the reactor.
PURPOSE
The U.S. Nuclear Regulatory Commission (NRC) is issuing this information notice to informaddressees about pressurizer heaters that failed following replacement because the heater elements provided by the vendor did not match the licensees' design specificatio It is expected that recipients will review the information for applicability to their facilities and consider actions, as appropriate, to avoid similar problem However, suggestions contained in this information notice are not NRC requirements; therefore, no specific action or written response is required.
DESCRIPTION OF CIRCUMSTANCES
During the Fall 2004 refueling outage, the licensee at Palo Verde Generating Station, Unit 3,replaced all 36 pressurizer heaters with replacements supplied by Framatome that had heaterinternals manufactured by Thermocoa From December 2004 through February 2005, four ofthe replaced heaters in the proportional heater banks faile On May 23, 2005, with Palo Verde Unit 3 in Mode 5 (cold shutdown), the licensee replaced nine Framatome/Thermocoax heaters with General Electric (GE) heater During the subsequent reactor heatup, five Framatome/Thermocoax heaters in the backup heater banks faile As a result of the continued heater failures, the licensee returned to Mode 5 to replace all remaining Framatome/Thermocoax pressurizer heaters with GE heater When the Framatome/Thermocoax heaters failed, all were grounded, and all but one tripped a circuit breaker to clear a ground faul The licensee discovered one heater grounded while maintenance was being performed during the outag There was no damage to any other equipment such as power cables as a result of the heater failures.During the Spring 2005 refueling outage, Waterford Steam Electric Station, Unit 3, replaced29 pressurizer heaters with replacements supplied by Framatome that had the heater internalsmanufactured by Thermocoa During plant heatup but prior to reactor startup, two of the replaced heaters experienced partial ejection of the epoxy in the receptacle area due to heat transfer to electrical connections in the receptacle area, six experienced failure due togrounding, and several experienced partial melting of the silicon-type material used to seal the bottom end of the receptacle The licensee replaced 23 Framatome/Thermocoax heaters with Watlow heaters and abandoned the remaining 6 Framatome/Thermocoax heaters in place by electrically disconnecting the There was no damage to any other equipment such as powercables as a result of the heater failures.The vendor subsequently inspected the failed heaters from the Palo Verde and Waterford plantsand determined that the heaters had been incorrectly fabricated with a longer heating element than the licensees' design specificatio The longer heating elements extended down into the heater sleeves and pressurizer shell thereby changing the location of the transition joint that separates the heated and unheated portion of the heater assembl This resulted in a reduced ability to transfer that heat away from the heater and also allowed more heat transfer to electrical connections in the receptacle area.
DISCUSSION
Technical specifications for PWRs specify a minimum required available capacity of pressurizerheaters to ensure that the RCS pressure can be controlled to maintain subcooled conditions in the RC Plant operation with failed pressurizer heaters can affect a facility's ability to control reactor pressur Following a reactor trip, unnecessary safety injection actuations could occur due to inability to maintain RCS system pressure above the actuation set point. Additionally, the longer heating elements extended down into the heater sleeves andpressurizer shell resulted the potential to exceed the allowable temperature limits by theAmerican Society of Mechanical Engineers Boiler and Pressure Vessel Cod The Palo Verde and Waterford licensees had each supplied Framatome the correct designspecification regarding the location of the transition joint between the heated and unheated portions of the heater assembl However, Framatome supplied pressurizer heater assemblies that did not match the design specificatio The licensees did not obtain vendor specifications and drawings that were sufficiently detailed to allow them to identify that the replacement pressurizer heaters were not consistent with the licensees' design specification. At Palo Verde Generating Station, Unit 3, one heater was discovered grounded whilemaintenance was being performed during the outag Sensitive ground-fault protection on low voltage circuits such as 480 V pressurizer heater circuits, can help in the detection of a ground faul Additional information on this subject is available in a Title 10 of the Code of FederalRegulations Part 21 (10 CFR Part 21) report from Framatome dated July 28, 2005, which isaccessible using NRC's document control system (Agencywide Documents Access andManagement System (ADAMS), Accession No. ML052140277).
CONTACT
SThis information notice requires no specific action or written respons Please direct anyquestions about this matter to the technical contacts listed below or the appropriate Office of Nuclear Reactor Regulation (NRR) project manager./RA/Christopher I. Grimes, DirectorDivision of Policy and Rulemaking Office of Nuclear Reactor RegulationTechnical Contacts: David N. Graves, R-IV/DRP/RPB-ETroy W. Pruett, R-IV/DRP/RPB-D817-860-8147817-860-8173 E-mail: DNG@nrc.govE-mail: TWP@nrc.govVijay K. Goel, NRR/DE/EEEB301-415-3730 E-mail: VKG@nrc.govNRR Project Manager:Omid Tabatabai, NRR/DIRS/IOEB301-415-6616 E-mail: OTY@nrc.govNote: NRC generic communications may be found on the NRC public Web site,http://www.nrc.gov, under Electronic Reading Room/Document Collection
CONTACT
SThis information notice requires no specific action or written respons Please direct anyquestions about this matter to the technical contacts listed below or the appropriate Office of Nuclear Reactor Regulation (NRR) project manager./RA/Christopher I. Grimes, DirectorDivision of Policy and Rulemaking Office of Nuclear Reactor RegulationTechnical Contacts: David N. Graves, R-IV/DRP/RPB-ETroy W. Pruett, R-IV/DRP/RPB-D817-860-8147817-860-8173 E-mail: DNG@nrc.govE-mail: TWP@nrc.govVijay K. Goel, NRR/DE/EEEB301-415-3730 E-mail: VKG@nrc.govNRR Project Manager:Omid Tabatabai, NRR/DIRS/IOEB301-415-6616 E-mail: OTY@nrc.govNote: NRC generic communications may be found on the NRC public Web site,http://www.nrc.gov, under Electronic Reading Room/Document Collections.DISTRIBUTION:IN FileADAMS ACCESSION NO: ML060100450OFFICEBC: R-IV/DRP/RPB-EBC: R-IV/DRP/RPB-D TECH EDITORD:R-IV/DRPNRR/DE/EEEBNAMEDNGravesTWPruettHChangATHowellVKGoel DATE1/24/20061/24/20061/17/20061/24/20062/13/2006OFFICE BC:NRR/DE/EEEBNRR/DIRS/IOEBTL:NRR/DIRS/IOEBLA:PGCG/DPRPM:PGCB/DPRNAMERVJenkinsOTabatabaiEJBennerCMHawesDBeaulieu DATE 1/23/2006 1/19/2006 1/3/20061/19/20062/13/2006OFFICEBC:NRR/DPR/PGCBD:NRR/DPR/PGCBNAMECJacksonCIGrimes DATE2/13/20062/14 /2006
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| list | - Information Notice 2006-02, Use of Galvanized Supports and Cable Trays with Meggitt Si 2400 Stainless Steel Jacketed Electrical Cables (19 January 2006, Topic: Safe Shutdown, Fire Barrier)
- Information Notice 2006-03, Motor Starter Failures Due to Mechanical Interlock Binding (25 January 2006, Topic: Stroke time)
- Information Notice 2006-04, Design Deficiency in Pressurizer Heaters for Pwrs (13 February 2006)
- Information Notice 2006-04, Design Deficiency in Pressurizer Heaters for PWRs (13 February 2006)
- Information Notice 2006-05, Possible Defect in Bussman KWN-R and KTN-R Fuses (3 March 2006)
- Information Notice 2006-07, Inappropriate Use of a Single Parameter Limit as a Nuclear Criticality Safety Limit at Fuel Cycle Facilities (31 March 2006)
- Information Notice 2006-07, Inappropriate Use of a Single Parameter Limit As a Nuclear Criticality Safety Limit at Fuel Cycle Facilities (31 March 2006)
- Information Notice 2006-07, Inappropriate Use of a Single Parameter Limit as a Nuclear Criticality Safety limit at Fuel Cycle Facilities (31 March 2006)
- Information Notice 2006-08, Secondary Piping Rupture at Mihama Power Station in Japan (16 March 2006, Topic: Safe Shutdown, Flow Accelerated Corrosion, Feedwater Heater)
- Information Notice 2006-08, Secondary Piping Rupture At Mihama Power Station in Japan (16 March 2006, Topic: Safe Shutdown, Flow Accelerated Corrosion, Feedwater Heater)
- Information Notice 2006-09, Performance of NRC-Licensed Individuals While on Duty With Respect to Control Room Attentiveness (11 April 2006, Topic: Inattentive)
- Information Notice 2006-09, Performance of NRC-Licensed Individuals While on Duty with Respect to Control Room Attentiveness (11 April 2006, Topic: Inattentive)
- Information Notice 2006-10, Use of Concentration Control For Criticality Safety (23 April 2006)
- Information Notice 2006-10, Use of Concentration Control for Criticality Safety (23 April 2006)
- Information Notice 2006-11, Applicability of Patient Intervention in Determining Medical Events for Gamma Stereotactic Radiosurgery and Other Therapy Procedures (12 June 2006, Topic: Brachytherapy)
- Information Notice 2006-13, Ground-Water Contamination Due To Undetected Leakage of Radioactive Water (10 July 2006, Topic: Time of Discovery)
- Information Notice 2006-13, E-mail from M. Mclaughlin on NRC, Regarding NRC Information Notice 2006-13: Groundwater Contamination (13 July 2006, Topic: Boric Acid, Time of Discovery)
- Information Notice 2006-14, Potentially Defective External Lead-Wire Connections in Barton Pressure Transmitters (25 September 2006, Topic: Functionality Assessment, Operability Assessment)
- Information Notice 2006-17, Recent Operating Experience of Service Water Systems Due to External Conditions (31 July 2006, Topic: Significance Determination Process, Frazil ice, Biofouling)
- Information Notice 2006-22, New Ultra-Low-Sulfur Diesel Fuel Oil Could Adversely Impact Diesel Engine Performance (12 October 2006)
- Information Notice 2006-29, Potential Common Cause Failure of Motor-operated Valves as a Result of Stem Nut Wear (14 December 2006)
- Information Notice 2006-29, Potential Common Cause Failure of Motor-operated Valves As a Result of Stem Nut Wear (14 December 2006)
- Information Notice 2006-30, Summary of Fitness-for-Duty Program Performance Reports for Calendar Year 2004 and 2005 (21 December 2006, Topic: Time of Discovery, Fitness for Duty, Blind Performance Test)
- Information Notice 2006-31, Inadequate Fault Interrupting Rating of Breakers (26 December 2006)
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