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| {{#Wiki_filter: | | {{#Wiki_filter:UNITED STATESNUCLEAR REGULATORY COMMISSIONOFFICE OF NUCLEAR MATERIAL SAFETY AND SAFEGUARDSWASHINGTON, D.C. 20555-0001July 6, 1999NRC INFORMATION NOTICE 99-23: SAFETY CONCERNS RELATED TO REPEATEDCONTROL UNIT FAILURES OF THE NUCLETRONCLASSIC MODEL HIGH-DOSE-RATE REMOTEAFTERLOADING BRACHYTHERAPY DEVICES |
| [[Issue date::July 6, 1999]]
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| NRC INFORMATION NOTICE 99-23: SAFETY CONCERNS RELATED TO REPEATEDCONTROL UNIT FAILURES OF THE NUCLETRONCLASSIC MODEL HIGH-DOSE-RATE REMOTEAFTERLOADING BRACHYTHERAPY DEVICES
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| ==Addressees== | | ==Addressees== |
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| :By January 1996, NRC was aware of three incidents where the Nucletron Classic Model HDRcontrol units failed (locked up) for unexplained reasons. These control unit failures exposed adeficiency in the design of the door interlock circuitry for the Nucletron Classic Model HDR.Nucletron issued a Safety Alert on March 4, 1996, describing this problem and providinginformation on the proper operator response to such failures. This safety alert was also issuedas an attachment to NRC Information Notice 96-21, issued on April 10, 1996, that discussedboth the door interlock problem and the control unit failures. Following these three reportedfailures of the control unit, Nucletron Corporation made field modifications to these devices tocorrect the door interlock failure mechanism and to eliminate the unexplained control unitfailures.Following these modifications, two similar failures were reported in 1997, four in 1998, and threeto date in 1999. These additional nine control unit failures, reported since the 1996 correctiveaction, indicate a ongoing problem with unexplained control unit failures. However, no furtherproblems have been reported with the operation of the door interlocks. Nucletron has continuedto investigate the ongoing control unit failures and now believes it has found the root cause ofthe failures and subsequently developed appropriate corrective measures. We understand thatthe newly developed corrective measures are presently undergoing testing beforeimplementation.0t rn4-] dwotaqq-O2s q4o1o -o4cW c eas | | :By January 1996, NRC was aware of three incidents where the Nucletron Classic Model HDRcontrol units failed (locked up) for unexplained reasons. These control unit failures exposed adeficiency in the design of the door interlock circuitry for the Nucletron Classic Model HDR.Nucletron issued a Safety Alert on March 4, 1996, describing this problem and providinginformation on the proper operator response to such failures. This safety alert was also issuedas an attachment to NRC Information Notice 96-21, issued on April 10, 1996, that discussedboth the door interlock problem and the control unit failures. Following these three reportedfailures of the control unit, Nucletron Corporation made field modifications to these devices tocorrect the door interlock failure mechanism and to eliminate the unexplained control unitfailures.Following these modifications, two similar failures were reported in 1997, four in 1998, and threeto date in 1999. These additional nine control unit failures, reported since the 1996 correctiveaction, indicate a ongoing problem with unexplained control unit failures. However, no furtherproblems have been reported with the operation of the door interlocks. Nucletron has continuedto investigate the ongoing control unit failures and now believes it has found the root cause ofthe failures and subsequently developed appropriate corrective measures. We understand thatthe newly developed corrective measures are presently undergoing testing beforeimplementation.0t rn4-] dwotaqq-O2s q4o1o -o4cW c eas |
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| '-IIN 99-23July 6, 1999 Discussion:In all 12 reported control unit failures no patient or personnel overexposures were reported. Ineach case the treatment unit continued to operate, as designed, when communications with thecontrol unit was lost. In this event, the microprocessor in the treatment unit continues thepreprogrammed treatment to the catheter being treated when the failure occurs, halting uponcompletion. If the failure occurs during a single catheter treatment or during the last catheter ina multi-catheter operation, then the treatment will proceed to completion. Otherwise, it willterminate with completion of the catheter being treated, leaving any remaining cathetersuntreated. Most users, however, when faced with a blank or frozen display on an inoperativecontrol unit, immediately abort the treatment, using the "Emergency Stop" button on the controlunit. The "Treatment Interrupt" button (called for in the 1" step on the Safety Alert procedures)on the control unit is rendered inoperative by the control unit failure. Irrespective of the methodof terminating the patient's treatment, the actual treatment data can subsequently be read fromthe treatment unit, using a handheld terminal device.Most patients receive less than the prescribed dose in the event of a control unit failure and, atthe discretion of the Authorized User, either the Written Directive must be revised to reflect theactual dose given or the remaining portion of the treatment given after repair or replacement ofthe defective control unit. To date, none of the reported control unit failures has resulted inoverexposures or misadministrations. However, the failure of the control unit removes the firstlayer of radiation safety protection. At this point, the avoidance of excessive radiation exposuresdepends upon either the continued proper operation of the treatment unit or operatorintervention.NRC previously issued Information Notice 96-21 on April 10, 1996, and included a copy of theNucletron issued Safety Alert, addressing the control unit failures, as an attachment. This SafetyAlert sets forth a series of four steps to be taken if, for any reason, the Control Unit stopsupdating the status of the treatment in progress. These steps should ensure that the treatmentis interrupted and the source retracted before licensee personnel enter the treatment room. Youare encouraged to follow these recommendations from the device vendor, as contained in itsSafety Alert of March 4, 1996. Any questions you may have related to these control unit failuresand related corrective actions, or to get a copy of the Safety Alert, should be addressed to yourNucletron Corporation representativ IN 99-23July 6, 1999 This information notice requires no specific action nor written response. If you have anyquestions about the information in this notice, please contact the technical contact listed belowor the appropriate regional office.Donald A. Cool, DirectorDivision of Industrial andMedical Nuclear SafetyOffice of Nuclear Material Safetyand SafeguardsContact: Robert L. Ayres, NMSS(301) 415-5746E-mail: rxal nrc.gov | | '-IIN 99-23July 6, 1999 Discussion:In all 12 reported control unit failures no patient or personnel overexposures were reported. Ineach case the treatment unit continued to operate, as designed, when communications with thecontrol unit was lost. In this event, the microprocessor in the treatment unit continues thepreprogrammed treatment to the catheter being treated when the failure occurs, halting uponcompletion. If the failure occurs during a single catheter treatment or during the last catheter ina multi-catheter operation, then the treatment will proceed to completion. Otherwise, it willterminate with completion of the catheter being treated, leaving any remaining cathetersuntreated. Most users, however, when faced with a blank or frozen display on an inoperativecontrol unit, immediately abort the treatment, using the "Emergency Stop" button on the controlunit. The "Treatment Interrupt" button (called for in the 1" step on the Safety Alert procedures)on the control unit is rendered inoperative by the control unit failure. Irrespective of the methodof terminating the patient's treatment, the actual treatment data can subsequently be read fromthe treatment unit, using a handheld terminal device.Most patients receive less than the prescribed dose in the event of a control unit failure and, atthe discretion of the Authorized User, either the Written Directive must be revised to reflect theactual dose given or the remaining portion of the treatment given after repair or replacement ofthe defective control unit. To date, none of the reported control unit failures has resulted inoverexposures or misadministrations. However, the failure of the control unit removes the firstlayer of radiation safety protection. At this point, the avoidance of excessive radiation exposuresdepends upon either the continued proper operation of the treatment unit or operatorintervention.NRC previously issued Information Notice 96-21 on April 10, 1996, and included a copy of theNucletron issued Safety Alert, addressing the control unit failures, as an attachment. This SafetyAlert sets forth a series of four steps to be taken if, for any reason, the Control Unit stopsupdating the status of the treatment in progress. These steps should ensure that the treatmentis interrupted and the source retracted before licensee personnel enter the treatment room. Youare encouraged to follow these recommendations from the device vendor, as contained in itsSafety Alert of March 4, 1996. Any questions you may have related to these control unit failuresand related corrective actions, or to get a copy of the Safety Alert, should be addressed to yourNucletron Corporation representative. |
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| | IN 99-23July 6, 1999 This information notice requires no specific action nor written response. If you have anyquestions about the information in this notice, please contact the technical contact listed belowor the appropriate regional office.Donald A. Cool, DirectorDivision of Industrial andMedical Nuclear SafetyOffice of Nuclear Material Safetyand SafeguardsContact: Robert L. Ayres, NMSS(301) 415-5746E-mail: rxal nrc.govAttachments:1. List of Recently Issued NMSS Information Notices2. List of Recently Issued NRC Information NoticesItWt4 a,-TV |
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| | K-'IAttachment 1IN 99-23July 6, 1999 LIST OF RECENTLY ISSUEDNMSS INFORMATION NOTICESInformation Date ofNotice No. Subject Issuance Issued to99-22 10 CFR 34.43(a)(1): Effective 6/25/99 Industrial Radiography LicenseesDate for Radiographer Certificationand Plans for Enforcement Discretion99-2099-1899-16-99-1199-0999-0699-0599-0499-03Contingency Planning for the 6/25/99Year 2000 Computer ProblemUpdate on NRC's Year 2000 6/14/99Activities for Materials Licenseesand Fuel Cycle Licensees andCertificate HoldersFederal Bureau of Investigation's 5/28Nuclear Site Security ProgramIncident Involving the Use of 4/16199Radioactive lodine-1 31Problems Encountered When 3/24/99Manually Editing treatment Dataon the Nucletron Microselectron-HDR (New) Model 105-9991998 Enforcement Sanctions as 3/19/99a Result of Deliberate Violationsof NRC Employee ProtectionRequirementsInadvertent Discharge of Carbon 3/8/99Dioxide Fire Protection Systemand Gas MigrationUnplanned Radiation Exposures 3/8/99to Radiographers, Resulting FromFailures to Follow Proper RadiationSafety ProceduresExothermic Reactions Involving 1/29/99Dried Uranium Oxide Powder(Yellowcake)All material and fuel cyclelicensees and certificate holdersAll material and fuel cyclelicensees and certificateholdersAll U.S. Nuclear RegulatoryCommission fuel cycle, powerreactor, and non-power reactorlicenseesAll medical use licenseesAll medical licensees authorizedto conduct high-dose-rate (HDR)remote after loadingbrachytherapy treatmentsAll U. S. Nuclear RegulatoryCommission licenseesAll holders of licenses for nuclearpower, research, and test reactor,and fuel cycle facilitiesAll radiography licenseesAll operating uranium recoveryfacilities that produce oxidepowder (U308) (yellowcake) |
| 1. List of Recently Issued NMSS Information Notices2. List of Recently Issued NRC Information NoticesItWt4 a,-TV K-'IAttachment 1IN 99-23July 6, 1999 LIST OF RECENTLY ISSUEDNMSS INFORMATION NOTICESInformation Date ofNotice No. Subject Issuance Issued to99-22 10 CFR 34.43(a)(1): Effective 6/25/99 Industrial Radiography LicenseesDate for Radiographer Certificationand Plans for Enforcement Discretion99-2099-1899-16-99-1199-0999-0699-0599-0499-03Contingency Planning for the 6/25/99Year 2000 Computer ProblemUpdate on NRC's Year 2000 6/14/99Activities for Materials Licenseesand Fuel Cycle Licensees andCertificate HoldersFederal Bureau of Investigation's 5/28Nuclear Site Security ProgramIncident Involving the Use of 4/16199Radioactive lodine-1 31Problems Encountered When 3/24/99Manually Editing treatment Dataon the Nucletron Microselectron-HDR (New) Model 105-9991998 Enforcement Sanctions as 3/19/99a Result of Deliberate Violationsof NRC Employee ProtectionRequirementsInadvertent Discharge of Carbon 3/8/99Dioxide Fire Protection Systemand Gas MigrationUnplanned Radiation Exposures 3/8/99to Radiographers, Resulting FromFailures to Follow Proper RadiationSafety ProceduresExothermic Reactions Involving 1/29/99Dried Uranium Oxide Powder(Yellowcake)All material and fuel cyclelicensees and certificate holdersAll material and fuel cyclelicensees and certificateholdersAll U.S. Nuclear RegulatoryCommission fuel cycle, powerreactor, and non-power reactorlicenseesAll medical use licenseesAll medical licensees authorizedto conduct high-dose-rate (HDR)remote after loadingbrachytherapy treatmentsAll U. S. Nuclear RegulatoryCommission licenseesAll holders of licenses for nuclearpower, research, and test reactor,and fuel cycle facilitiesAll radiography licenseesAll operating uranium recoveryfacilities that produce oxidepowder (U308) (yellowcake)
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| v>Attachment 2IN 99-23July 6, 1999 LIST OF RECENTLY ISSUEDNRC INFORMATION NOTICESInformation Date ofNotice No. Subject Issuance Issued to99-22 10 CFR 34.43(a)(1); Effective 7/6/99 Industrial Radiography LicenseesDate for Radiographer Certificationand Plans for Enforcement Discretion99-2199-2099-1999-1899-1799-16-99-15Recent Plant Events CausedBy Human Performance ErrorsContingency Planning for theYear 200 Computer ProblemRupture of the Shell Side of aFeedwater Heater at the PointBeach Nuclear PlantUpdate on NRC's Year 2000Activities for Materials Licenseesand Fuel Cycle Licensees andCertificate Holders6/25/996/25/996/23/996/14/99All holders of licenses for nuclearpower, test, and research reactorsAll material and fuel cyclelicensees and certificate holdersAll holders of operating licensesor construction permits for nuclearpower reactorsAll material and fuel cyclelicensees and certificate holdersAll holders of OL for nuclearpower reactors, except those whohave permanently ceasedoperations and have certified thatthe fuel has been permanentlyremoved from the reactorAll U.S. Nuclear RegulatoryCommission fuel cycle, powerreactor, and non-power reactorlicenseesAll holders of operating licenses orconstruction permits for nuclearpower reactorsProblems Associated with Post-Fire 6/3/99Safe-Shutdown Circuit AnalysesFederal Bureau of Investigation's 5/28Nuclear Site Security ProgramMisapplication of 10 CFR Part 71Transportation Shipping CaskLicensing Basis to 10 CFR Part 50Design Basis5/27/99OL = Operating LicenseCP = Construction Permit | | v>Attachment 2IN 99-23July 6, 1999 LIST OF RECENTLY ISSUEDNRC INFORMATION NOTICESInformation Date ofNotice No. Subject Issuance Issued to99-22 10 CFR 34.43(a)(1); Effective 7/6/99 Industrial Radiography LicenseesDate for Radiographer Certificationand Plans for Enforcement Discretion99-2199-2099-1999-1899-1799-16-99-15Recent Plant Events CausedBy Human Performance ErrorsContingency Planning for theYear 200 Computer ProblemRupture of the Shell Side of aFeedwater Heater at the PointBeach Nuclear PlantUpdate on NRC's Year 2000Activities for Materials Licenseesand Fuel Cycle Licensees andCertificate Holders6/25/996/25/996/23/996/14/99All holders of licenses for nuclearpower, test, and research reactorsAll material and fuel cyclelicensees and certificate holdersAll holders of operating licensesor construction permits for nuclearpower reactorsAll material and fuel cyclelicensees and certificate holdersAll holders of OL for nuclearpower reactors, except those whohave permanently ceasedoperations and have certified thatthe fuel has been permanentlyremoved from the reactorAll U.S. Nuclear RegulatoryCommission fuel cycle, powerreactor, and non-power reactorlicenseesAll holders of operating licenses orconstruction permits for nuclearpower reactorsProblems Associated with Post-Fire 6/3/99Safe-Shutdown Circuit AnalysesFederal Bureau of Investigation's 5/28Nuclear Site Security ProgramMisapplication of 10 CFR Part 71Transportation Shipping CaskLicensing Basis to 10 CFR Part 50Design Basis5/27/99OL = Operating LicenseCP = Construction Permit |
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| <lI-1,-23>, 6, 1999 This information notice requires no specific action nor written response. If you have anyquestions about the information in this notice, please contact the technical contact listed belowor the appropriate regional office.(ORIG. SIGNED BY)Donald A. Cool, DirectorDivision of Industrial andMedical Nuclear SafetyOffice of Nuclear Material Safetyand SafeguardsContact: Robert L. Ayres, NMSS(301) 415-5746E-mail: rxal nrc.gov | | <lI-1,-23>, 6, 1999 This information notice requires no specific action nor written response. If you have anyquestions about the information in this notice, please contact the technical contact listed belowor the appropriate regional office.(ORIG. SIGNED BY)Donald A. Cool, DirectorDivision of Industrial andMedical Nuclear SafetyOffice of Nuclear Material Safetyand SafeguardsContact: Robert L. Ayres, NMSS(301) 415-5746E-mail: rxal nrc.govAttachments:1. List of Recently Issued NMSS Information Notices2. List of Recently Issued NRC Information NoticesDOCUMENT NAME: A & G:%AYRES\IN99C-XX.WPD* See previous concurrenceOFFICE JMSIB C Editor* I MSIB* N Ms MSIB* I NNAME RAyres/liucy EKraus FSturz LCamper DCoolDATE 6/ 09 /99 6109 /99 6115/99 6/15/99 6/28/99s ^=rloEIf AI aMen n rn0PVA4~w O r K~~~AML REGO~ I u %L W |
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| | IN 99-XXAJ June XX, 1999 |
| 1. List of Recently Issued NMSS Information Notices2. List of Recently Issued NRC Information NoticesDOCUMENT NAME: A & G:%AYRES\IN99C-XX.WPD* See previous concurrenceOFFICE JMSIB C Editor* I MSIB* N Ms MSIB* I NNAME RAyres/liucy EKraus FSturz LCamper DCoolDATE 6/ 09 /99 6109 /99 6115/99 6/15/99 6/28/99s ^=rloEIf AI aMen n rn0PVA4~w O r K~~~AML REGO~ I u %L W IN 99-XXAJ June XX, 1999 This information notice requires no specific action nor written response. If you have anyquestions about the information in this notice, please contact the technical contact listed belowor the appropriate regional office.Donald A. Cool, DirectorDivision of Industrial andMedical Nuclear SafetyOffice of Nuclear Material Safetyand SafeguardsContact: Robert L. Ayres, NMSS(301) 415-5746E-mail: rxal @nrc.gov
| | .z~ IN 99-XXJune xx, 1999 DOCUMENT NAME: A & G:\AYRES\IN99C-XX.WPDtfqff /£fL411V5. --/ 0 :"//* See orevious concurrenceOFFICE MSIB C Editor I MSIB MSIB N MSIB l NN /NAME RAyres/jcy EKraus FSturz LCamper DCooI ,,DATE 16/ 9 /99 6/ 09 /99 6/ IU< /99 6/ IS /99 16/ ,199OFFICIAL RECORD COPYI//',,Ii |
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| | 6I~-IN 99-XXL/ June xx, 1999 DOCUMENT NAME: A & G:\AYRES\1N99C-XX.WPD* See previous concurrenceOFFICE _ SBIC Eio*I M~- S9fIN MINAME RAyres/kicy EKraus D -erCoolDATE 1 6/ 09 /99 6/09 /99 Is__ 199 6/ ____99__ 6/ /99OFFICIAL RECORD COPY |
| 1. List of Recently Issued NMSS Information Notices2. List of Recently Issued NRC Information Notices A''<//DOCUMENT NAME: A & G:\AYRES\IN99C-XX.WPD* See previous concurrenceOFFICE MSIB I C Editor I MSIB* I lISIB l MSIB I NNAME RAyrestic EKraus FSturz LCamper DC_______DATE 6/ 09 /99 6/09 /99 6/15/99 6/15/99 6/.t1/99OFFICIAL RECORD COPY
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Safety Concerns Related to Repeated Control Unit Failures of the Nucletron Classic Model High-Dose-Rate Remote Afterloading Brachytherapy DevicesML031040399 |
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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: |
07/06/1999 |
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From: |
Cool D A NRC/NMSS/IMNS |
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To: |
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References |
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IN-99-023, NUDOCS 9907010001 |
Download: ML031040399 (9) |
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Category:NRC Information Notice
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Appendix VI: NRC FOIA Responses (B-51 Through B-53); Turkey Point Event Report; NRC Information Notice 2010-12: Containment Liner Cor Information Notice 2010-12, Intervenors' Fifth Motion to Amend And/Or Supplement Proposed Contention No. 5 (Shield Building Cracking). Appendix VI: NRC FOIA Responses (B-51 Through B-53); Turkey Point Event Report; NRC Information Notic2012-08-17017 August 2012 Intervenors' Fifth Motion to Amend And/Or Supplement Proposed Contention No. 5 (Shield Building Cracking). Appendix VI: NRC FOIA Responses (B-51 Through B-53); Turkey Point Event Report; NRC Information Notice 2010-12: Containment Liner Cor Information Notice 2012-13, Boraflex Degradation Surveillance Programs and Corrective Actions in the Spent Fuel Pool2012-08-10010 August 2012 Boraflex Degradation Surveillance Programs and Corrective Actions in the Spent Fuel Pool Information Notice 2012-13, Boraflex Degradation Surveillance Programs And Corrective Actions In The Spent Fuel Pool2012-08-10010 August 2012 Boraflex Degradation Surveillance Programs And Corrective Actions In The Spent Fuel Pool Information Notice 2012-11, Age Related Capacitor Degradation2012-07-23023 July 2012 Age Related Capacitor Degradation ML12031A0132012-02-0606 February 2012 U.S. Nuclear Regulatory Commission Investigation Report No. 2-2010-058, Cpn International, Inc Information Notice 2011-19, Licensee Event Reports Containing Information Pertaining to Defects to Basic Components2011-09-26026 September 2011 Licensee Event Reports Containing Information Pertaining to Defects to Basic Components Information Notice 2011-15, Steel Containment Degradation and Associated License Renewal Aging Management Issues2011-08-0101 August 2011 Steel Containment Degradation and Associated License Renewal Aging Management Issues Information Notice 2011-17, Calculation Methodologies for Operability Determinations of Gas Voids in Nuclear Power Plant Piping2011-07-26026 July 2011 Calculation Methodologies for Operability Determinations of Gas Voids in Nuclear Power Plant Piping Information Notice 2011-13, Official Exhibit - NYS000329-00-BD01 - NRC Information Notice 2011-13, Control Rod Blade Cracking Resulting in Reduced Design Lifetime (Jun 29, 2011) (NRC in 2011-13)2011-06-29029 June 2011 Official Exhibit - NYS000329-00-BD01 - NRC Information Notice 2011-13, Control Rod Blade Cracking Resulting in Reduced Design Lifetime (Jun 29, 2011) (NRC in 2011-13) Information Notice 2011-13, Official Exhibit - Nys000329-00-Bd01 - NRC Information Notice 2011-13, Control Rod Blade Cracking Resulting in Reduced Design Lifetime (Jun 29, 2011) (Nrc in 2011-13)2011-06-29029 June 2011 Official Exhibit - Nys000329-00-Bd01 - NRC Information Notice 2011-13, Control Rod Blade Cracking Resulting in Reduced Design Lifetime (Jun 29, 2011) (Nrc in 2011-13) Information Notice 2011-13, OFFICIAL EXHIBIT - NYS000329-00-BD01 - NRC Information Notice 2011-13, Control Rod Blade Cracking Resulting in Reduced Design Lifetime (Jun 29, 2011) (NRC in 2011-13)2011-06-29029 June 2011 OFFICIAL EXHIBIT - NYS000329-00-BD01 - NRC Information Notice 2011-13, Control Rod Blade Cracking Resulting in Reduced Design Lifetime (Jun 29, 2011) (NRC in 2011-13) Information Notice 2011-04, IN: Contaminants and Stagnant Conditions Affecting Stress Corrosion Cracking in Stainless Steel Piping in Pressurized Water Reactors2011-02-23023 February 2011 IN: Contaminants and Stagnant Conditions Affecting Stress Corrosion Cracking in Stainless Steel Piping in Pressurized Water Reactors Information Notice 2011-04, In: Contaminants and Stagnant Conditions Affecting Stress Corrosion Cracking in Stainless Steel Piping in Pressurized Water Reactors2011-02-23023 February 2011 In: Contaminants and Stagnant Conditions Affecting Stress Corrosion Cracking in Stainless Steel Piping in Pressurized Water Reactors Information Notice 2011-04, in: Contaminants and Stagnant Conditions Affecting Stress Corrosion Cracking in Stainless Steel Piping in Pressurized Water Reactors2011-02-23023 February 2011 in: Contaminants and Stagnant Conditions Affecting Stress Corrosion Cracking in Stainless Steel Piping in Pressurized Water Reactors Information Notice 2010-26, New England Coalition'S Motion for Leave to Reply to NRC Staff'S Objection to Nec'S Notification of Information Notice 2010-26 and Entergy'S Response to the Supplement to Nec'S Petition for Commission Review of LBP-10-2010-12-30030 December 2010 New England Coalition'S Motion for Leave to Reply to NRC Staff'S Objection to Nec'S Notification of Information Notice 2010-26 and Entergy'S Response to the Supplement to Nec'S Petition for Commission Review of LBP-10-19 Information Notice 2010-26, New England Coalition'S Motion for Leave to Reply to NRC Staff'S Objection to Nec'S Notification of Information Notice 2010-26 and Entergy'S Response to the Supplement to Nec'S Petition for Commission Review2010-12-30030 December 2010 New England Coalition'S Motion for Leave to Reply to NRC Staff'S Objection to Nec'S Notification of Information Notice 2010-26 and Entergy'S Response to the Supplement to Nec'S Petition for Commission Review of LBP-10-19 Information Notice 2010-26, 2010/12/21-NRC Staff'S Objection to Nec'S Notification of Information Notice 2010-262010-12-21021 December 2010 2010/12/21-NRC Staff'S Objection to Nec'S Notification of Information Notice 2010-26 ML13066A1872009-12-16016 December 2009 Draft NRC Information Notice 2009-xx - Underestimate of Dam Failure Frequency Used in Probabilistic Risk Assessments ML1007804482009-11-23023 November 2009 Email from Peter Bamford, NRR to Pamela Cowan, Exelon on TMI Contamination Control Event Information Notice 2009-11, NSP000059-Revised Prefiled Testimony of Northard/Petersen/Peterson-NRC Information Notice 2009-112009-07-0707 July 2009 NSP000059-Revised Prefiled Testimony of Northard/Petersen/Peterson-NRC Information Notice 2009-11 Information Notice 2009-10, Official Exhibit - NYS000019-00-BD01- NRC Information Notice 2009-10, Transformers Failures - Recent Operating Experience (Jul. 7, 2009) (NRC in 2009-10)2009-07-0707 July 2009 Official Exhibit - NYS000019-00-BD01- NRC Information Notice 2009-10, Transformers Failures - Recent Operating Experience (Jul. 7, 2009) (NRC in 2009-10) Information Notice 2009-09, Improper Flow Controller Settings Renders Injection Systems Inoperable and Surveillance Did Not Identify2009-06-19019 June 2009 Improper Flow Controller Settings Renders Injection Systems Inoperable and Surveillance Did Not Identify Information Notice 2008-12, Reactor Trip Due to Off-Site Power Fluctuation2008-07-0707 July 2008 Reactor Trip Due to Off-Site Power Fluctuation Information Notice 2008-11, Service Water System Degradation at Brunswicksteam Electric Plant Unit 12008-06-18018 June 2008 Service Water System Degradation at Brunswicksteam Electric Plant Unit 1 Information Notice 2008-04, Counterfeit Parts Supplied to Nuclear Power Plants2008-04-0707 April 2008 Counterfeit Parts Supplied to Nuclear Power Plants Information 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 2007-29, Temporary Scaffolding Affects Operability of Safety-Related Equipment2007-09-17017 September 2007 Temporary Scaffolding Affects Operability of Safety-Related Equipment Information Notice 2007-14, Loss of Offsite Power and Dual-Unit Trip at Catawba Nuclear Generating Station2007-03-30030 March 2007 Loss of Offsite Power and Dual-Unit Trip at Catawba Nuclear Generating Station Information Notice 2007-06, Potential Common Cause Vulnerabilities in Essential Service Water Systems2007-02-0909 February 2007 Potential Common Cause Vulnerabilities in Essential Service Water Systems Information Notice 2007-05, Vertical Deep Draft Pump Shaft and Coupling Failures2007-02-0909 February 2007 Vertical Deep Draft Pump Shaft and Coupling Failures Information Notice 2006-31, Inadequate Fault Interrupting Rating of Breakers2006-12-26026 December 2006 Inadequate Fault Interrupting Rating of Breakers Information Notice 2006-29, Potential Common Cause Failure of Motor-operated Valves as a Result of Stem Nut Wear2006-12-14014 December 2006 Potential Common Cause Failure of Motor-operated Valves as a Result of Stem Nut Wear Information Notice 2006-29, Potential Common Cause Failure of Motor-operated Valves As a Result of Stem Nut Wear2006-12-14014 December 2006 Potential Common Cause Failure of Motor-operated Valves As a Result of Stem Nut Wear Information Notice 2006-13, E-mail from M. Mclaughlin on NRC, Regarding NRC Information Notice 2006-13: Groundwater Contamination2006-07-13013 July 2006 E-mail from M. 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 STATESNUCLEAR REGULATORY COMMISSIONOFFICE OF NUCLEAR MATERIAL SAFETY AND SAFEGUARDSWASHINGTON, D.C. 20555-0001July 6, 1999NRC INFORMATION NOTICE 99-23: SAFETY CONCERNS RELATED TO REPEATEDCONTROL UNIT FAILURES OF THE NUCLETRONCLASSIC MODEL HIGH-DOSE-RATE REMOTEAFTERLOADING BRACHYTHERAPY DEVICES
Addressees
- All U.S. Nuclear Regulatory Commission (NRC) medical licensees authorized to usebrachytherapy sources in Nucletron Classic Model high-dose-rate (HDR) remote afterloaders.
Purpose
- NRC is issuing this information notice to alert you to ongoing control unit failures with NucletronClassic Model HDR devices. You should review this information for applicability to your facilitiesand consider actions, as appropriate, to minimize the impact of such failures on patienttreatments and personnel exposures. However, suggestions contained in this information noticeare not NRC requirements; therefore, no specific action nor written response is required.
Description of Circumstances
- By January 1996, NRC was aware of three incidents where the Nucletron Classic Model HDRcontrol units failed (locked up) for unexplained reasons. These control unit failures exposed adeficiency in the design of the door interlock circuitry for the Nucletron Classic Model HDR.Nucletron issued a Safety Alert on March 4, 1996, describing this problem and providinginformation on the proper operator response to such failures. This safety alert was also issuedas an attachment to NRC Information Notice 96-21, issued on April 10, 1996, that discussedboth the door interlock problem and the control unit failures. Following these three reportedfailures of the control unit, Nucletron Corporation made field modifications to these devices tocorrect the door interlock failure mechanism and to eliminate the unexplained control unitfailures.Following these modifications, two similar failures were reported in 1997, four in 1998, and threeto date in 1999. These additional nine control unit failures, reported since the 1996 correctiveaction, indicate a ongoing problem with unexplained control unit failures. However, no furtherproblems have been reported with the operation of the door interlocks. Nucletron has continuedto investigate the ongoing control unit failures and now believes it has found the root cause ofthe failures and subsequently developed appropriate corrective measures. We understand thatthe newly developed corrective measures are presently undergoing testing beforeimplementation.0t rn4-] dwotaqq-O2s q4o1o -o4cW c eas
'-IIN 99-23July 6, 1999 Discussion:In all 12 reported control unit failures no patient or personnel overexposures were reported. Ineach case the treatment unit continued to operate, as designed, when communications with thecontrol unit was lost. In this event, the microprocessor in the treatment unit continues thepreprogrammed treatment to the catheter being treated when the failure occurs, halting uponcompletion. If the failure occurs during a single catheter treatment or during the last catheter ina multi-catheter operation, then the treatment will proceed to completion. Otherwise, it willterminate with completion of the catheter being treated, leaving any remaining cathetersuntreated. Most users, however, when faced with a blank or frozen display on an inoperativecontrol unit, immediately abort the treatment, using the "Emergency Stop" button on the controlunit. The "Treatment Interrupt" button (called for in the 1" step on the Safety Alert procedures)on the control unit is rendered inoperative by the control unit failure. Irrespective of the methodof terminating the patient's treatment, the actual treatment data can subsequently be read fromthe treatment unit, using a handheld terminal device.Most patients receive less than the prescribed dose in the event of a control unit failure and, atthe discretion of the Authorized User, either the Written Directive must be revised to reflect theactual dose given or the remaining portion of the treatment given after repair or replacement ofthe defective control unit. To date, none of the reported control unit failures has resulted inoverexposures or misadministrations. However, the failure of the control unit removes the firstlayer of radiation safety protection. At this point, the avoidance of excessive radiation exposuresdepends upon either the continued proper operation of the treatment unit or operatorintervention.NRC previously issued Information Notice 96-21 on April 10, 1996, and included a copy of theNucletron issued Safety Alert, addressing the control unit failures, as an attachment. This SafetyAlert sets forth a series of four steps to be taken if, for any reason, the Control Unit stopsupdating the status of the treatment in progress. These steps should ensure that the treatmentis interrupted and the source retracted before licensee personnel enter the treatment room. Youare encouraged to follow these recommendations from the device vendor, as contained in itsSafety Alert of March 4, 1996. Any questions you may have related to these control unit failuresand related corrective actions, or to get a copy of the Safety Alert, should be addressed to yourNucletron Corporation representative.
IN 99-23July 6, 1999 This information notice requires no specific action nor written response. If you have anyquestions about the information in this notice, please contact the technical contact listed belowor the appropriate regional office.Donald A. Cool, DirectorDivision of Industrial andMedical Nuclear SafetyOffice of Nuclear Material Safetyand SafeguardsContact: Robert L. Ayres, NMSS(301) 415-5746E-mail: rxal nrc.govAttachments:1. List of Recently Issued NMSS Information Notices2. List of Recently Issued NRC Information NoticesItWt4 a,-TV
K-'IAttachment 1IN 99-23July 6, 1999 LIST OF RECENTLY ISSUEDNMSS INFORMATION NOTICESInformation Date ofNotice No. Subject Issuance Issued to99-22 10 CFR 34.43(a)(1): Effective 6/25/99 Industrial Radiography LicenseesDate for Radiographer Certificationand Plans for Enforcement Discretion99-2099-1899-16-99-1199-0999-0699-0599-0499-03Contingency Planning for the 6/25/99Year 2000 Computer ProblemUpdate on NRC's Year 2000 6/14/99Activities for Materials Licenseesand Fuel Cycle Licensees andCertificate HoldersFederal Bureau of Investigation's 5/28Nuclear Site Security ProgramIncident Involving the Use of 4/16199Radioactive lodine-1 31Problems Encountered When 3/24/99Manually Editing treatment Dataon the Nucletron Microselectron-HDR (New) Model 105-9991998 Enforcement Sanctions as 3/19/99a Result of Deliberate Violationsof NRC Employee ProtectionRequirementsInadvertent Discharge of Carbon 3/8/99Dioxide Fire Protection Systemand Gas MigrationUnplanned Radiation Exposures 3/8/99to Radiographers, Resulting FromFailures to Follow Proper RadiationSafety ProceduresExothermic Reactions Involving 1/29/99Dried Uranium Oxide Powder(Yellowcake)All material and fuel cyclelicensees and certificate holdersAll material and fuel cyclelicensees and certificateholdersAll U.S. Nuclear RegulatoryCommission fuel cycle, powerreactor, and non-power reactorlicenseesAll medical use licenseesAll medical licensees authorizedto conduct high-dose-rate (HDR)remote after loadingbrachytherapy treatmentsAll U. S. Nuclear RegulatoryCommission licenseesAll holders of licenses for nuclearpower, research, and test reactor,and fuel cycle facilitiesAll radiography licenseesAll operating uranium recoveryfacilities that produce oxidepowder (U308) (yellowcake)
v>Attachment 2IN 99-23July 6, 1999 LIST OF RECENTLY ISSUEDNRC INFORMATION NOTICESInformation Date ofNotice No. Subject Issuance Issued to99-22 10 CFR 34.43(a)(1); Effective 7/6/99 Industrial Radiography LicenseesDate for Radiographer Certificationand Plans for Enforcement Discretion99-2199-2099-1999-1899-1799-16-99-15Recent Plant Events CausedBy Human Performance ErrorsContingency Planning for theYear 200 Computer ProblemRupture of the Shell Side of aFeedwater Heater at the PointBeach Nuclear PlantUpdate on NRC's Year 2000Activities for Materials Licenseesand Fuel Cycle Licensees andCertificate Holders6/25/996/25/996/23/996/14/99All holders of licenses for nuclearpower, test, and research reactorsAll material and fuel cyclelicensees and certificate holdersAll holders of operating licensesor construction permits for nuclearpower reactorsAll material and fuel cyclelicensees and certificate holdersAll holders of OL for nuclearpower reactors, except those whohave permanently ceasedoperations and have certified thatthe fuel has been permanentlyremoved from the reactorAll U.S. Nuclear RegulatoryCommission fuel cycle, powerreactor, and non-power reactorlicenseesAll holders of operating licenses orconstruction permits for nuclearpower reactorsProblems Associated with Post-Fire 6/3/99Safe-Shutdown Circuit AnalysesFederal Bureau of Investigation's 5/28Nuclear Site Security ProgramMisapplication of 10 CFR Part 71Transportation Shipping CaskLicensing Basis to 10 CFR Part 50Design Basis5/27/99OL = Operating LicenseCP = Construction Permit
<lI-1,-23>, 6, 1999 This information notice requires no specific action nor written response. If you have anyquestions about the information in this notice, please contact the technical contact listed belowor the appropriate regional office.(ORIG. SIGNED BY)Donald A. Cool, DirectorDivision of Industrial andMedical Nuclear SafetyOffice of Nuclear Material Safetyand SafeguardsContact: Robert L. Ayres, NMSS(301) 415-5746E-mail: rxal nrc.govAttachments:1. List of Recently Issued NMSS Information Notices2. List of Recently Issued NRC Information NoticesDOCUMENT NAME: A & G:%AYRES\IN99C-XX.WPD* See previous concurrenceOFFICE JMSIB C Editor* I MSIB* N Ms MSIB* I NNAME RAyres/liucy EKraus FSturz LCamper DCoolDATE 6/ 09 /99 6109 /99 6115/99 6/15/99 6/28/99s ^=rloEIf AI aMen n rn0PVA4~w O r K~~~AML REGO~ I u %L W
IN 99-XXAJ June XX, 1999
.z~ IN 99-XXJune xx, 1999 DOCUMENT NAME: A & G:\AYRES\IN99C-XX.WPDtfqff /£fL411V5. --/ 0 :"//* See orevious concurrenceOFFICE MSIB C Editor I MSIB MSIB N MSIB l NN /NAME RAyres/jcy EKraus FSturz LCamper DCooI ,,DATE 16/ 9 /99 6/ 09 /99 6/ IU< /99 6/ IS /99 16/ ,199OFFICIAL RECORD COPYI//',,Ii
6I~-IN 99-XXL/ June xx, 1999 DOCUMENT NAME: A & G:\AYRES\1N99C-XX.WPD* See previous concurrenceOFFICE _ SBIC Eio*I M~- S9fIN MINAME RAyres/kicy EKraus D -erCoolDATE 1 6/ 09 /99 6/09 /99 Is__ 199 6/ ____99__ 6/ /99OFFICIAL RECORD COPY
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list | - Information Notice 1999-01, Deterioration of High-Efficiency Particulate Air Filters in a Pressurized Water Reactor Containment Fan Cooler Unit (20 January 1999)
- 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 Sources (21 January 1999, Topic: Brachytherapy)
- Information Notice 1999-03, Exothermic Reactors Involving Dried Uranium Oxide Powder (Yellowcake) (29 January 1999, Topic: Brachytherapy)
- Information Notice 1999-04, Unplanned Radiation Exposures to Radiographers, Resulting from Failures to Follow Proper Radiation Safety Procedures (1 March 1999, Topic: Brachytherapy)
- Information Notice 1999-05, Inadvertent Discharge of Carbon Dioxide Fire Protection System and Gas Migration (8 March 1999, Topic: Brachytherapy)
- Information Notice 1999-06, 1998 Enforcement Sanctions as a Result of Deliberate Violations of NRC Employee Protection Requirements (19 March 1999, Topic: Enforcement Discretion, Brachytherapy)
- Information Notice 1999-06, 1998 Enforcement Sanctions As a Result of Deliberate Violations of NRC Employee Protection Requirements (19 March 1999, Topic: Enforcement Discretion)
- Information Notice 1999-07, Failed Fire Protection Deluge Valves & Potential Testing Deficiencies in Preaction Sprinkler Systems (22 March 1999, Topic: Safe Shutdown)
- Information Notice 1999-08, Urine Specimen Adulteration (26 March 1999, Topic: Brachytherapy)
- Information Notice 1999-09, Problems Encountered When Manually Editing Treatment Data on the Nucletron Microselectron-HDR (New) Model 105-999 (24 March 1999, Topic: Brachytherapy)
- Information Notice 1999-10, Degradation of Prestressing Tendon Systems in Prestresssed Concrete Containments (13 April 1999)
- Information Notice 1999-11, Incidents Involving the Use of Radioactive Iodine-131 (16 April 1999, Topic: Brachytherapy)
- Information Notice 1999-12, Year 2000 Computer Systems Readiness Audits (28 April 1999, Topic: Brachytherapy)
- Information Notice 1999-13, Insights from NRC Inspections of Low-and Medium-Voltage Circuit Breaker Maintenance Programs (29 April 1999, Topic: Brachytherapy)
- Information Notice 1999-14, Unanticipated Reactor Water Draindown at Quad Cities Unit 2, Arkansas Nuclear One Unit 2, & FitzPatrick (5 May 1999, Topic: Reactor Vessel Water Level, Brachytherapy)
- Information Notice 1999-15, Misapplication for 10CFR Part 71 Transportation Shipping Cask Licensing Basis to 10CFR Part 50 Design Basis (27 May 1999, Topic: Brachytherapy)
- Information Notice 1999-16, Federal Bureau of Investigation'S Nuclear Site Security Program (28 May 1999, Topic: Brachytherapy)
- Information Notice 1999-17, Problems Associated with Post-Fire Safe-Shutdown Circuit Analyses (3 June 1999, Topic: Hot Short, Safe Shutdown, Temporary Modification, Emergency Lighting, Fire Protection Program)
- Information Notice 1999-18, Update on Nrc'S Year 2000 Activities for Material Licensees and Fuel Cycle Licensees and Certificate Holders (14 June 1999, Topic: Brachytherapy)
- Information Notice 1999-19, Rupture of the Shell Side of a Feedwater Heater at the Point Beach Nuclear Plant (23 June 1999)
- Information Notice 1999-20, Contingency Planning for the Year 2000 Computer Problem (25 June 1999, Topic: Brachytherapy)
- Information Notice 1999-21, Recent Plant Events Caused by Human Performance Errors (25 June 1999, Topic: Probabilistic Risk Assessment)
- Information Notice 1999-22, 10CFR 34.43(a)(1); Effective Date for Radiographer Certification and Plans for Enforcement Discretion (25 June 1999, Topic: Enforcement Discretion, Brachytherapy)
- Information Notice 1999-23, Safety Concerns Related to Repeated Control Unit Failures of the Nucletron Classic Model High-Dose-Rate Remote Afterloading Brachytherapy Devices (6 July 1999, Topic: Enforcement Discretion, Brachytherapy)
- Information Notice 1999-24, Broad-Scope Licensees' Responsibilities for Reviewing and Approving Unregistered Sealed Sources and Devices (12 July 1999, Topic: Enforcement Discretion, Brachytherapy)
- Information Notice 1999-25, Year 2000 Contingency Planning Activities (10 August 1999, Topic: Enforcement Discretion, Brachytherapy)
- Information Notice 1999-26, Safety and Economic Consequences of Misleading Marketing Information (24 August 1999, Topic: Enforcement Discretion, Brachytherapy)
- Information Notice 1999-27, Malfunction of Source Retraction Mechanism in Cobalt-60 Teletherapy Treatment Units (2 September 1999, Topic: Enforcement Discretion, Brachytherapy)
- Information Notice 1999-28, Recall of Star Brand Fire Protection Sprinkler Heads (30 September 1999, Topic: Enforcement Discretion, Brachytherapy)
- Information Notice 1999-30, Failure of Double Contingency Based on Administrative Controls Involving Laboratory Sampling and Spectroscopic Analysis of Wet Uranium Waste (8 November 1999, Topic: Enforcement Discretion, Brachytherapy)
- Information Notice 1999-30, Failure of Double Contingency Based On Administrative Controls Involving Laboratory Sampling and Spectroscopic Analysis of Wet Uranium Waste (8 November 1999, Topic: Enforcement Discretion, Brachytherapy)
- Information Notice 1999-31, Operational Controls to Guard Against Inadventent Nuclear Criticality (17 November 1999, Topic: Enforcement Discretion, Brachytherapy)
- Information Notice 1999-31, Operational Controls To Guard Against Inadventent Nuclear Criticality (17 November 1999, Topic: Enforcement Discretion, Brachytherapy)
- Information Notice 1999-32, Effect of Year 2000 Issue on Medical Licenseess (17 December 1999, Topic: Brachytherapy)
- Information Notice 1999-32, Effect of Year 2000 Issue on Medical Licensees (17 December 1999, Topic: Brachytherapy, Overdose, Underdose)
- Information Notice 1999-33, Management Of Wastess Contaminated with Radioactive Materialss (21 December 1999, Topic: Brachytherapy)
- Information Notice 1999-33, Management of Wastes Contaminated with Radioactive Materials (21 December 1999, Topic: Brachytherapy)
- Information Notice 1999-33, Management Of Wastes Contaminated with Radioactive Materials (21 December 1999, Topic: Brachytherapy)
- Information Notice 1999-33, Management Of Wastes Contaminated With Radioactive Materials (21 December 1999, Topic: Brachytherapy)
- Information Notice 1999-34, Potential Fire Hazard in the Use of Polyalphaolefin in Testing of Air Filter (28 December 1999)
- Information Notice 1999-34, PotentialPotentialPotential FireFireFire HazardHazardHazard ininIn thetheThe UseUseUse ofofOf PolyalphaolefinPolyalphaolefinPolyalphaolefin ininIn TestingTestingTesting ofofOf AirAirAir FilterFilterFilter (28 December 1999)
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