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MONTHYEARML0715105522007-06-15015 June 2007 Commitment for Hydrogen Igniter Backup Power Supply & Closure Process for Generic Issue 189, Susceptibility of Ice Condenser & Mark III Containments to Early Failure from Hydrogen Combustion During a Severe Accident Project stage: Other ML0715105402007-06-15015 June 2007 Commitment for Hydrogen Igniter Backup Power Supply & Closure Process for Generic Issue 189, Susceptibility of Ice Condenser & Mark III Containments to Early Failure from Hydrogen Combustion During a Severe Accident Project stage: Other ML0904007952009-02-0404 February 2009 GSI-189 Action Plan, Feb. 09 Update, Publicly Available Version Project stage: Other 2007-06-15
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Category:Letter
MONTHYEARIR 05000458/20230402024-01-18018 January 2024 95001 Supplemental Inspection Supplemental Report 05000458/2023040 and Follow-Up Assessment Letter RBG-48271, Supplement to License Amendment Request to Adopt Risk Informed Completion Times TSTF-505, Revision 2, Provide Risk-Informed Extended Completion Times RITSTF Initiative 4b and Application to Adopt 10 CFR 50.69, Risk2024-01-12012 January 2024 Supplement to License Amendment Request to Adopt Risk Informed Completion Times TSTF-505, Revision 2, Provide Risk-Informed Extended Completion Times RITSTF Initiative 4b and Application to Adopt 10 CFR 50.69, Risk ML24012A1962024-01-12012 January 2024 Response to 2nd Round Request for Additional Information Concerning Relief Request Number EN-RR-22-001 Proposed Alternative to Use ASME Code Case N-752, Risk-Informed Categorization and ML24011A1742024-01-11011 January 2024 Security Baseline Inspection Report (Cover Letter) ML23349A1672023-12-21021 December 2023 Request for Withholding Information from Public Disclosure ML23348A3572023-12-14014 December 2023 Application to Revise Technical Specifications to Use Online Monitoring Methodology Slides and Affidavit for Pre-Submittal Meeting ML23340A1592023-12-13013 December 2023 Entergy Operations, Inc. - Entergy Fleet Project Manager Assignment ML23352A0292023-12-13013 December 2023 Entergy - 2024 Nuclear Energy Liability Evidence of Financial Protection IR 05000458/20230102023-12-12012 December 2023 Biennial Problem Identification and Resolution Inspection Report 05000458/2023010 RBG-48267, Reply to a Notice of Violation, NRC Inspection Report 05000458/20230032023-12-0707 December 2023 Reply to a Notice of Violation, NRC Inspection Report 05000458/2023003 ML23333A1362023-11-29029 November 2023 Supplement to Request for Exemption from Enhanced Weapons, Firearms Background Checks, and Security Event Notifications Implementation ML23325A1432023-11-21021 November 2023 Request for Exemption from Enhanced Weapons, Firearms Background Checks, and Security Event Notifications Implementation ML23310A0322023-11-13013 November 2023 Integrated Inspection Report 05000458/2023003 IR 05000458/20230032023-11-13013 November 2023 Integrated Inspection Report 05000458/2023003 ML23311A2082023-11-0909 November 2023 Reassignment of U.S. Nuclear Regulatory Commission Branch Chief in the Division of Operating Reactor Licensing for Plant Licensing Branch IV ML23311A4322023-11-0909 November 2023 Notification of NRC Supplemental Inspection (95001) and Request for Information RBG-48264, Core Operating Limits Report (COLR) - Cycle 23, Revision 12023-11-0606 November 2023 Core Operating Limits Report (COLR) - Cycle 23, Revision 1 RBG-48260, Notification of Readiness for Supplemental Inspection2023-10-12012 October 2023 Notification of Readiness for Supplemental Inspection ML23278A2402023-10-0606 October 2023 Regulatory Audit Plan in Support of License Amendment Requests to Revise TSs to Adopt Risk-Informed Completion Times and Implement the Provisions of 10 CFR 50.69 RBG-48258, Notification of Readiness for Supplemental Inspection2023-10-0505 October 2023 Notification of Readiness for Supplemental Inspection RBG-48259, Revision to Reply to Notice of Violation; EA-23-0552023-10-0303 October 2023 Revision to Reply to Notice of Violation; EA-23-055 ML23270B9932023-09-29029 September 2023 Request to Update ASME Boiler & Pressure Vessel Code Relief Request SE with NRC-Approved Revision of Bwrip Guidelines (GG-ISI-020 & RBS-ISI-019) (EPID L-2022-LLR-0090) - Non-Proprietary ML23269A1242023-09-27027 September 2023 Request for Withholding Information from Public Disclosure IR 05000458/20234012023-09-26026 September 2023 Cyber Security Inspection Report 05000458/2023401 IR 05000458/20230012023-09-21021 September 2023 NRC Inspection Report 05000458/2023001, Disputed Non-Cited Violation Rescinded RBG-48254, Report of Changes and Errors to 10CFR50.462023-09-21021 September 2023 Report of Changes and Errors to 10CFR50.46 IR 05000458/20234032023-09-21021 September 2023 NRC Security Inspection Report 05000458/2023403 (Cover Letter) RBG-48249, Reply to a Notice of Violation, EA-23-0712023-09-14014 September 2023 Reply to a Notice of Violation, EA-23-071 RBG-48253, Submittal of Owner'S Activity Report Form for Cycle 222023-09-12012 September 2023 Submittal of Owner'S Activity Report Form for Cycle 22 IR 05000458/20230122023-09-0101 September 2023 Comprehensive Engineering Team Inspection Report 05000458/2023012 IR 05000458/20230052023-08-21021 August 2023 Updated Inspection Plan for River Bend Station (Report 05000458/2023005) - Mid Cycle Letter RBG-48247, Reply to Notice of Violation; 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June 15, 2007 Mr. Joseph E. Venable Vice President of Operations Entergy Operations, Inc.
River Bend Station 5485 US Highway 61 N St. Francisville, LA 70775
SUBJECT:
RIVER BEND STATION, UNIT 1 - COMMITMENT FOR HYDROGEN IGNITER BACKUP POWER SUPPLY AND CLOSURE PROCESS FOR GENERIC ISSUE 189, SUSCEPTIBILITY OF ICE CONDENSER AND MARK III CONTAINMENTS TO EARLY FAILURE FROM HYDROGEN COMBUSTION DURING A SEVERE ACCIDENT (TAC MB7245)
Dear Mr. Venable:
This letter acknowledges your February 15, 2007, letter committing to changes at the River Bend Station that will enhance plant capabilities to mitigate the potential for early containment failure from hydrogen combustion. In addition to existing procedures to power one train of igniters through a cross-tie from the Division 3 diesel generator, you proposed changes involving procurement of portable equipment to power one train of igniters and development of associated procedures and training.
The Nuclear Regulatory Commission (NRC) staff agrees that the proposed changes will resolve concerns related to Generic Issue 189 (GI-189), Susceptibility of Ice Condenser and Mark III Containments to Early Failure from Hydrogen Combustion During a Severe Accident, and provide benefits for certain security scenarios. The NRC staff understands that the changes will enhance the electrical independence of the containment hydrogen igniter system. This action is warranted for boiling water reactors with Mark III containments because many systems that prevent core damage rely on the same power supplies and electrical distribution system as the hydrogen igniters. This enhancement mitigates the potential for early containment failure by allowing control of hydrogen within containment following certain beyond-design-basis events that may progress to core damage and preclude operation of the hydrogen igniters from their normal power supply. The NRC staff expects this enhancement will provide hydrogen igniter system electrical independence commensurate with the expected frequency, challenges, and uncertainties associated with these beyond-design-basis events.
Consistent with the guidelines of NRC Management Directive 6.4, Generic Issues Program, the NRC staff will perform a verification inspection at River Bend. These inspections will include elements to verify that you establish procedures to provide back-up power to the hydrogen igniters, train appropriate staff in the procedures, and institute appropriate controls on the reliability and availability of necessary equipment. Procedures that allow trained personnel to establish backup power to the igniters within 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> are fully consistent with goals to mitigate potential hydrogen accumulation. The NRC staff understands that implementation of vendor recommended maintenance and existing procedures will ensure adequate availability and
J. E. Venable reliability of the backup power supplies. In addition, NRC licensing project managers may verify the integrity of your commitments over time through established review procedures for your commitment management program.
Verification of your committed actions and those of other affected licensees will provide the basis by which the NRC will close out GI-189. The NRC staff will perform the verification inspection at a time consistent with the implementation date specified in your letter.
Accordingly, please keep the NRC staff informed of any changes in the scope of modifications or the implementation date.
Sincerely,
/RA by John Lubinski for Catherine Haney/
Catherine Haney, Director Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No.: 50-458 License No.: NPF-47 cc: See next page
ML071510552 OFFICE DSS/SBPB DSS/SBPB:BC DSS:D DPR/PGCB DIRS:D NAME SJones JSegala JWermiel JGolla ECollins DATE 6/5/07 6/5/07 6/5/07 6/5/07 6/8/07 OFFICE DORL/LPLIV/PM DORL/LPLIV/LA DORL/LPLIV/BC DORL/D NAME BVaidya JBurkhardt THiltz JWL for CHaney DATE 6/12/07 6/12/07 6/12/07 6/15/07 River Bend Station cc:
Mr. Michael L. Kansler Executive Vice President and President and Chief Nuclear Officer Chief Operating Officer Entergy Operations, Inc. Entergy Operations, Inc.
1340 Echelon Parkway P.O. Box 31995 Jackson, MS 39213 Jackson, MS 39286-1995 Manager, Licensing General Manager Plant Operations Entergy Operations, Inc. Entergy Operations, Inc.
River Bend Station River Bend Station 5485 US Highway 61N 5485 US Highway 61N St. Francisville, LA 70775 St. Francisville, LA 70775 Director, Nuclear Safety & Licensing Director, Nuclear Safety Assurance Entergy Operations, Inc. Entergy Operations, Inc.
1340 Echelon Parkway River Bend Station Jackson, MS 39213-8298 5485 US Highway 61N St. Francisville, LA 70775 Louisiana Department of Environmental Quality Vice President, Operations Support Radiological Emergency Planning and Entergy Operations, Inc.
Response Division P.O. Box 31995 P.O. Box 4312 Jackson, MS 39286-1995 Baton Rouge, LA 70821-4312 Mr. Jim Calloway Louisiana Department of Environmental Public Utility Quality Commission of Texas Office of Environmental Compliance 1701 N. Congress Avenue P.O. Box 4312 Austin, TX 78711-3326 Baton Rouge, LA 70821-4312 Attorney General Senior Resident Inspector State of Louisiana P.O. Box 1050 P.O. Box 94095 St. Francisville, LA 70775 Baton Rouge, LA 70804-9095 President of West Feliciana Brian Almon Police Jury Public Utility Commission P.O. Box 1921 William B. Travis Building St. Francisville, LA 70775 P.O. Box 13326 1701 North Congress Avenue Regional Administrator, Region IV Austin, Texas 78701-3326 U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 400 Richard Penrod, Senior Environmental Arlington, TX 76011-8064 Scientist/State Liaison Officer Office of Environmental Services Ms. H. Anne Plettinger Northwestern State University 3456 Villa Rose Drive Russell Hall, Room 201 Baton Rouge, LA 70806 Natchitoches, LA 71497 November 2006