ML102420002 November 1, 2010 NRC INFORMATION NOTICE 2010-23: MALFUNCTIONS OF EMERGENCY DIESEL GENERATOR SPEED SWITCH CIRCUITS
ADDRESSEES
All holders of an operating license or construction permit for a nuclear power reactor issued under Title 10 of the Code of Federal Regulations, Part 50, "Domestic Licensing of Production and Utilization Facilities," except those who have permanently ceased operations and have certified that fuel has been permanently removed from the reactor vesse
PURPOSE
The U.S. Nuclear Regulatory Commission (NRC) is issuing this information notice (IN) to inform addressees about recent examples of malfunctions of emergency diesel generator (EDG) speed switch circuit The NRC expects that recipients will review the information for applicability to their facilities and consider actions, as appropriate, to avoid similar problem Suggestions contained in this IN are not NRC requirements; therefore, no specific action or written response is require DESCRIPTION OF CIRCUMSTANCES Wolf Creek Generating Station On October 22, 2009, with the Wolf Creek Generating Station in a refueling outage, the control room annunciator for the "A" EDG actuate The licensee took the "A" EDG out of service for troubleshootin The cause of the event was the actuation of the speed switch in the starting circuit of the "A" EDG because of high alternating current (ac) noise on the direct current (dc) supply circuit of the speed switc The source of this electrical noise was traced to the annunciator power supply within the EDG gauge board pane The noise was more than the filtering capacity of the capacitor installed on the dc feed to the speed switc The licensee replaced the annunciator power supply and the speed switc It also established a preventive maintenance activity to have the ac ripple voltage measured at the dc supply circui Additional information appears in Wolf Creek Generating Station Licensee Event Report 50-482/2009-005, dated December 21, 2009, on the NRC's public Web site in the Agencywide Documents Access and Management System (ADAMS) under Accession No. ML09364004 San Onofre Nuclear Generating Station On December 12, 2009, at San Onofre Nuclear Generating Station Unit 3, during the performance of a test required by the technical specifications, the train "A" EDG failed to start because a capacitor failed in one of the two dc-dc converter power supplies for the local panel IN 2010-23
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list | - Information Notice 2010-01, Pipe Support Anchors Installed Improperly (1 March 2010)
- Information Notice 2010-02, Construction-Related Experience with Cables, Connectors, and Junction Boxes (28 January 2010)
- Information Notice 2010-03, Failures of Motor-Operated Valves Due to Degraded Stem Lubricant (3 February 2010, Topic: Power-Operated Valves)
- Information Notice 2010-04, Diesel Generator Voltage Regulation System Component Due to Latent Manufacturing Defect (26 February 2010)
- Information Notice 2010-04, Diesel Generator Voltage Regulation System Component Due To Latent Manufacturing Defect (26 February 2010)
- Information Notice 2010-05, Management of Steam Generator Loose Parts and Automated Eddy Current Data Analysis (3 February 2010)
- Information Notice 2010-06, Inadvertent Control Rod Withdrawal Event While Shutdown (17 February 2010, Topic: Shutdown Margin)
- Information Notice 2010-07, Welding Defects in Replacement Steam Generators (5 April 2010, Topic: Hydrostatic, Incorporated by reference, Dissimilar Metal Weld)
- Information Notice 2010-09, Importance of Understanding Circuit Breaker Control Power Indications (14 April 2010)
- Information Notice 2010-10, Implementation of a Digital Control System Under 10 CFR 50.59 (28 May 2010, Topic: Enforcement Discretion, Fuel cladding)
- Information Notice 2010-11, Potential for Steam Voiding Causing Residual Heat Removal System Inoperability (16 June 2010)
- 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 Notice 2010-12: Con (17 August 2012, Topic: Moisture barrier, License Renewal)
- 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 Notic (17 August 2012, Topic: Time of Discovery, Moisture barrier, License Renewal)
- 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 Notice 2010-12: Contain (17 August 2012, Topic: Moisture barrier, License Renewal)
- Information Notice 2010-13, Failure to Verify that Post-Fire-Shutdown Procedures Can Be Performed (22 July 2010, Topic: Safe Shutdown, Fire Protection Program)
- Information Notice 2010-13, Failure to Verify That Post-Fire-Shutdown Procedures Can Be Performed (22 July 2010, Topic: Safe Shutdown, Fire Protection Program)
- Information Notice 2010-14, Containment Concrete Surface Condition Examination Frequency And Acceptance Criteria (4 August 2010, Topic: Aging Management)
- Information Notice 2010-14, Containment Concrete Surface Condition Examination Frequency and Acceptance Criteria (4 August 2010)
- Information Notice 2010-17, Common Cause Failure of Boiling-Water Reactor Recirculation Pumps With Variable Speed Drives (10 September 2010, Topic: Minimum Critical Power Ratio)
- Information Notice 2010-17, Common Cause Failure of Boiling-Water Reactor Recirculation Pumps with Variable Speed Drives (10 September 2010, Topic: Minimum Critical Power Ratio)
- Information Notice 2010-18, Generic Issue 199, Implications of Updated Probabilistic Seismic Hazard Estimates in Central and Eastern United States on Existing Plants. (2 September 2010, Topic: Safe Shutdown Earthquake, Probabilistic Risk Assessment, Earthquake, Generic Issues Program, Backfit)
- Information Notice 2010-20, Repetitive Failures of Turbine Driven Auxiliary Feedwater Pumps Due To Ineffective Corrective Actions (24 September 2010, Topic: Condition Adverse to Quality)
- Information Notice 2010-20, Repetitive Failures of Turbine Driven Auxiliary Feedwater Pumps Due to Ineffective Corrective Actions (24 September 2010, Topic: Condition Adverse to Quality)
- Information Notice 2010-21, Crack-Like Indication in the U-bend Region of a Thermally Treated Alloy 600 Steam Generator Tube (6 October 2010)
- Information Notice 2010-22, Fuel Assemblies Damaged During Refueling Operations Due to Misalignment (25 October 2010, Topic: Fuel cladding)
- Information Notice 2010-22, Fuel Assemblies Damaged During Refueling Operations due to Misalignment (25 October 2010, Topic: Fuel cladding)
- Information Notice 2010-23, in: Malfunctions of Emergency Diesel Generator Speed Switch Circuits (1 November 2010)
- Information Notice 2010-23, In: Malfunctions of Emergency Diesel Generator Speed Switch Circuits (1 November 2010)
- Information Notice 2010-23, IN: Malfunctions of Emergency Diesel Generator Speed Switch Circuits (1 November 2010)
- Information Notice 2010-25, Inadequate Electrical Connections (17 November 2010)
- Information Notice 2010-26, 2010/12/21-NRC Staff'S Objection to Nec'S Notification of Information Notice 2010-26 (21 December 2010, Topic: Aging Management)
- 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- (30 December 2010, Topic: Aging Management)
- 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 (30 December 2010, Topic: Aging Management)
- Information Notice 2010-27, Ventilation System Preventive Maintenance and Design Issues (16 December 2010, Topic: Earthquake, Fire Protection Program)
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