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Category:Memoranda
MONTHYEARML23324A4332024-01-23023 January 2024
10/16-17/2023 Summary of Routine NRC Site Visit at the Oyster Creek Nuclear Generating Station to Discuss License Termination Plans and Other Technical Topics
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May 25, 2017, Oyster Creek Nuclear Generating Station Public Meeting Notice
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Memo T Bowers from s Ruffin, Technical Assistance Requests - Review 2015 Tri-Annual Decommissioning Funding Plans for Multiple Independent Spent Fuel Storage Installations W/ Encl 2 (Template)
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OEDO-16-00165 - Briefing Package for Drop-In Visit on March 23, 2016, by Senior Management of Exelon Generation Company, LLC with the NRC Executive Director for Operations
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February 3, 2016, Summary of Closed Meeting with the U.S. Nuclear Regulatory Commission and Exelon Generation Company, LLC, Regarding Security Plan Change for the Oyster Creek Nuclear Generating Station
ML16015A1402016-01-27027 January 2016
Forthcoming Closed Meeting with the U.S. Nuclear Regulatory Commission and Exelon Generation Company, LLC Regarding a Physical Security Plan Change for the Oyster Creek Nuclear Generating Station
ML15239A4622015-08-28028 August 2015
54p PSP Rev 13 Close-out Letter 8-27-15
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Summary - Site Visit Regarding Physical Security License Amendment Request for Oyster Creek Nuclear Generating Station
ML13309A0802013-12-11011 December 2013
Memorandum to File: Transcript for 10 CFR 2.206 Petition from Beyond Nuclear (Et Al) Regarding General Electric Mark I and Mark II Boiling-Water Reactors
ML13199A5092013-09-18018 September 2013
Transmittal of Final Oyster Creek Nuclear Station Accident Sequence Precursor Analysis
ML13240A2952013-09-10010 September 2013
Notice of Forthcoming Closed Meeting with the Nuclear Regulatory Commission and Exelon Generation Company, LLC Regarding a Pre-Submittal Physical Security License Amendment Request for Oyster Creek Nuclear Generating Station
ML13190A3522013-07-10010 July 2013
Notice of Forthcoming Teleconference with Exelon Generation Company, LLC
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1/3/2013 - Notice of Forthcoming Meeting with Exelon Generation Company, LLC, to Discuss Requests for Additional Information Regarding Exelon Physical Security Plans
ML13196A2202012-06-0606 June 2012
Memo from B. Balsam, NRR and D. Logan, NRR to J. Susco, NRR on Summary of Section 7 Consultation Activities Related to the National Marine Fisheries Service'S Final Rule to List the Atlantic Sturgeon
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ML11250A1712011-09-14014 September 2011
Notice of Forthcoming Meeting with Petitioner Requesting Action Under 10 CFR 2.206 Regarding Immediate Suspension of the Operating Licenses of General Electric (GE) Mark 1 Boiling Water Reactors (Bwrs)
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NRC Comments on Draft Licensee-Developed Exam (Operating) (Folder 2)
ML11126A0962011-05-12012 May 2011
Notice of Meeting with Petitioner Requesting Action Under 10CFR2.206 Regarding Immediate Suspension of Operating Licenses of General Electric Mark 1 Boiling Water Reactors
ML1109502212011-04-11011 April 2011
Electronic Transmission, Draft Request for Additional Information Regarding Review of Flaw Evaluation for Weld NG-E-007
ML1108402192011-04-0404 April 2011
Memorandum to File: Transcripts for 10 CFR 2.206 Petition Regarding Oyster Creek and Nine Mile Point, Unit No. 1 Peak Cladding Temperature and ECCS Performance
ML1100502522011-02-0909 February 2011
Memo to Chairman Jaczko Fm R. W. Borchardt, EDO Initiatives for Improved Communication of Groundwater Incidents
ML1035703292011-01-28028 January 2011
OMA Exemption, Fire Protection Input for Request for Exemption from Title 10 of the Code of Federal Regulations Part 50, Appendix R, Section Iii.G, Fire Protection of Safe Shutdown Capability (Phase 1)
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Units 1 & 2 - Electronic Transmission, Draft Request for Additional Information Regarding Request to Implement Emergency Action Level Scheme Change to NEI 99-01, Revision 5
ML1030905672010-11-0505 November 2010
Electronic Transmission, Draft Request for Additional Information Regarding License Amendment Request to Modify Required Actions for Inoperability of an Emergency Diesel Generator
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Closeout of Bulletin 2007-1 Security Officer Attentiveness,
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Electronic Transmission, Draft Request for Additional Information Regarding License Amendment Request to Modify Required Actions for Inoperability of an Emergency Diesel Generator
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Electronic Transmission, Draft Request for Additional Information Regarding License Amendment Request to Relocate Surveillance Frequencies to a Licensee Controlled Document
ML1016806172010-06-18018 June 2010
Electronic Transmission, Draft Request for Additional Information Regarding License Amendment Request to Allow Temporary Changes to Secondary Containment Boundary During Shutdown Conditions
ML1006401882010-03-0505 March 2010
Charter for the Groundwater Contamination Task Force
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Electronic Transmission, Draft Request for Additional Information Regarding License Amendment Request to Relocate Surveillance Frequencies to a Licensee Controlled Document
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Forthcoming Meeting Notice with Exelon Generation Company, LLC, to Discuss Oyster Creek Nuclear Generating Station, License Amendment Request Regarding Secondary Containment Operability
ML0933805322009-12-0404 December 2009
Electronic Transmission, Draft Request for Additional Information Regarding Requested Exemptions to Fire Protection Requirements in 10 CFR 50, Appendix R
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Request for Additional Information on Request for Exception from 10 CFR 50, Appendix R, Section Iii. G, Fire Protection of Safe Shutdown Capability (Phase 1 & 2) at Oyster Creek Nuclear Generating Station
ML0932210302009-11-18018 November 2009
Electronic Transmission, Draft RAI Regarding Response to Generic Letter 2008-01, Managing Gas Accumulation in Emergency Core Cooling, Decay Heat Removal, and Containment Spray System
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Notice of Meeting with Exelon Generation Company, LLC, to Discuss Oyster Creek Nuclear Generating Station and Exelon Fleet Lessons-Learned on Buried Piping Issues
ML0926801972009-09-29029 September 2009
Notice of Pre-application Meeting to Discuss Egc'S Plants to Submit Power Uprate Requests for Various Units in Its Reactor Fleet
ML0925803412009-09-17017 September 2009
Revised Notice of Meeting with Exelon Generation Company, LLC, to Discuss Oyster Creek Nuclear Generating Station, License Amendment Request Regarding Secondary Containment Operability
ML0925801582009-09-15015 September 2009
Audit Plan for Review of the Addendum 3-Dimensional Finite Element Analysis for the Oyster Creek Nuclear Generating Station Containment Drywell Shell
ML0925705572009-09-14014 September 2009
Draft Request for Additional Information Regarding Secondary Containment Operability
ML0925402362009-09-11011 September 2009
Draft Request for Additional Information Regarding Secondary Containment Operability
ML0921202792009-08-0404 August 2009
Draft Request for Additional Information Regarding Control Rod Drive Rod Notch Testing Frequency
2024-01-23
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September 18, 2013 MEMORADUM TO: Michele G. Evans, Director Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation FROM: Richard P. Correia, Director /RA/ D. Coe for R. Correia Division of Risk Analysis Office of Nuclear Regulatory Research
SUBJECT:
TRANSMITTAL OF FINAL OYSTER CREEK NUCLEAR STATION ACCIDENT SEQUENCE PRECURSOR ANALYSIS This memorandum provides the final results of an accident sequence precursor (ASP) analysis of an operational event that occurred at Oyster Creek Nuclear Station on July 23, 2012.
This analysis has a final conditional core damage probability (CCDP) of 5x10-5 which is less than the threshold for a significant precursor (i.e., CCDP greater than or equal to 1x10-3).
In accordance with U.S. Nuclear Regulatory Commission Regulatory Issue Summary 2006-24, Revised Review and Transmittal Process for Accident Sequence Precursor Analyses, this analysis was not sent out for formal review to the licensee, Office of Nuclear Reactor Regulation (NRR), and Region I because the analysis had a preliminary CCDP of less than 1x10-4.
However, feedback received from informal reviews by NRR and Region I were incorporated into the analysis, as appropriate.
The ASP Program continues to systematically review licensee event reports (LERs) and all other event reporting information [e.g., inspection reports (IRs)] for potential precursors, and to analyze those events which have the potential to be precursors. The complete summary of FY 2012 ASP events will be provided in the upcoming Commission paper on the status of the ASP Program and Standardized Plant Analysis Risk (SPAR) Models due to be issued in October 2013.
Transmittal to Licensee Requested. We are requesting NRR to send the enclosed final ASP analysis to the licensee for their information. The ASP analysis will be made publically available after the analysis has been transmitted to the licensee. Please inform us when the ASP analysis has been sent to the licensee.
CONTACT: Keith Tetter, RES/DRA 301-251-7605
M. Evans Final ASP Analysis Summary. A brief summary of the final ASP analysis, including the results, is provided below.
Turbine-Generator Trip and Reactor Scram Following a Transmission Line Trip Causing a Loss of Offsite Power (July 2012) at Oyster Creek Nuclear Station. This event is documented in LER 219/12-001-02 and Inspection Report 05000219/2012004.
Event Summary. At 3:29 am on July 23, 2012, Oyster Creek experienced a complete loss of offsite power (LOOP) for about one and a half hours. With the loss of the 230 kV transmission path following a single phase-to-ground fault on one of the three lines, the loading on the main generator was significantly reduced. The reduction in loading resulted in an increase in turbine speed, prompting the reactor protection system to scram the reactor in anticipation of a turbine trip. Both emergency diesel generators (EDGs) automatically started and powered their respective essential busses as designed.
Summary of Analysis Results. This operational event resulted in a CCDP of 5x10-5. The detailed ASP analysis can be found in the Enclosure.
Risk Insights. The dominant sequence for this analysis involves the LOOP initiating event and operator errors. The risk of the at-power LOOP event was heavily influenced by the dependency between operator errors associated with manual depressurization and Emergency Condenser operation.
Sensitive Information. The detailed ASP analysis has been reviewed in accordance with current guidance of sensitive unclassified non-safeguards information, and it has been determined that it may be released to the public.
Enclosure:
As stated
ML13199A502 OFFICE RES/DRA/PRB RES/DRA/PRB RES/DRA NAME K. Tetter G. DeMoss R. Correia DATE 7/19/13 8/2/13 9/18/13