|
|---|
Category:Memoranda
MONTHYEARML23129A6062023-05-0404 May 2023
Special Inspection Team Charters to Evaluate the Circumstances Surrounding the Ground Settling at the Davis-Besse Nuclear Power Station
ML23044A3662023-02-15015 February 2023
Calendar Year 2022 Reactor Oversight Process Baseline Inspection Program Completion - Region III
ML21096A2282021-03-30030 March 2021
FEMA Disapproval of Davis-Besse Exercise Exemption
ML19182A3562019-07-23023 July 2019
Quarterly Report on the Status of Public Petitions Under Title 10 of the Code of Federal Regulations, Section 2.206 - April 1 to June 30, 2019
ML19162A0102019-06-0707 June 2019
Memorandum to File Environmental Assessment and Finding of No Significant Impact for Firstenergy Nuclear Operating Company'S Decommissioning Funding Plan Submitted in Accordance with 10 CFR 72.30(B) and 72.30(C) for Davis Besse ISFSI
ML16088A2052016-03-28028 March 2016
Enclosure 1 - (72.30 DFP Reviews to Be Completed 2015) - Memo T Bowers from s Ruffin, Technial Assistance Requests - Review 2015 Tri-Annual Decommissioning Funding Plans for Multiple Independent Spent Fuel Storage Installations
ML16088A2042016-03-28028 March 2016
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)
ML15205A1692015-08-0707 August 2015
ACRS Review of the Davis Besse Nuclear Plant LRA - Transmittal of the Sser
ML15182A1912015-07-16016 July 2015
Annual Financial Test for a Parent Company Guarantee Given by Firstenergy Solutions Corporation and Firstenergy Corporation
ML15089A1642015-04-27027 April 2015
Summary of February 25, 2015, Partially Closed Meeting with Industry Stakeholders Regarding the Babcock and Wilcox Loss of Coolant Accident Evaluation Model Analysis
IR 05000334/20004122014-07-0808 July 2014
NRC Staff'S Spot-Check Review of First Energy Nuclear Operating Company'S Ownership Interest in Beaver Valley, Units 1 and 2, Perry, and Davis-Besse, Docket No. 05000334, 05000412, 05000440, and 05000346, on June 10, 2014-Finding of No Pote
ML14099A4642014-05-0606 May 2014
Summary of Public Meetings to Discuss Draft Supplement 52 to the Generic Environmental Impact Statement for License Renewal of Nuclear Plants Regarding Davis-Besse Nuclear Generating Station, Unit 1
ML13280A9062013-10-21021 October 2013
Forthcoming Meeting with Firstenergy Nuclear Operating Company (FENOC) to Discuss Voluntary Risk Informed Fire Protection Amendment for Davis-Besse
ML13142A5122013-07-0202 July 2013
Summary of Telephone Conference Call Held on May 21, 2013, Between NRC and Firstenergy Nuclear Operating Company, Concerning RAI Pertaining to the Davis-Besse Nuclear Power Station, LRA
ML13171A2922013-06-13013 June 2013
LTR-13-0540 - Bill Hawkins and Vinod Arora Email San Onofre Nuclear Generating Station (SONGS) Lessons Learn for Davis-Besse
ML13154A4442013-06-0404 June 2013
Rai'S Following Ifib Analysis of Fenoc'S 2013 Decommissioning Funding Status Report for Davis-Besse and Perry
ML12199A2072012-07-17017 July 2012
Public Meeting Notice to Discuss the 2011 End-of-Cycle Performance Assessment
ML12158A4002012-06-0808 June 2012
6/26/2012 Forthcoming Meeting Firstenergy Nuclear Operating Company (FENOC)
ML1206901652012-03-0909 March 2012
Memo - Summary of Public Meeting with Industry Regarding Pwrog'S Boric Acid Corrosion Test Program
ML12018A1652012-01-27027 January 2012
Summary of Telephone Conference Call Held on November 9, 2011, Between the NRC and Firstenergy Nuclear Operating Company, Concerning RAI Pertaining to the Davis-Besse, LRA
ML14028A5462012-01-25025 January 2012
NRC Telecon Regarding Davis-Besse License Renewal Severe Accident Mitigation Alternatives Analysis Questions
ML11363A1712012-01-23023 January 2012
Summary of Telephone Conference Call Held on December 12, 2011 Between the U.S. Nuclear Regulatory Commission and Firstenergy Nuclear Operating Company, Concerning Request for Additional Information
ML11355A0952011-12-29029 December 2011
Summary of Telephone Conference Call Held on December 8, 2011, Between the U.S. Nuclear Regulatory Commission and Firstenergy Nuclear Operating Company, Concerning RAIs Pertaining to the Davis-Besse Nuclear Power Station, LRA
ML11348A0212011-12-21021 December 2011
Summary of Telephone Conference Call Held on November 1, 2011 Between the U.S. Nuclear Regulatory Commission and Firstenergy Nuclear Operating Company, Concerning Requests for Additional Information Pertaining to the Davis Besse Nuclear Pow
ML11341A1182011-12-14014 December 2011
Summary of Telephone Conference Call Held on June 15, 2011 Between the U.S. Nuclear Regulatory Commission and Firstenergy Nuclear Operating Company, Concerning Requests for Additional Information Pertaining to the Davis-Besse Nuclear Power
ML11339A0862011-12-13013 December 2011
Summary of Telephone Conference Call Between the U.S. Nuclear Regulatory Commission and Firstenergy Nuclear Operating Company, Concerning RAIs Pertaining to the Davis-Besse Nuclear Power Station LRA
ML11327A0082011-12-0202 December 2011
Summary of Telephone Conference Call Held on September 29, 2011, Between the NRC and Firstenergy Nuclear Operating Company, Concerning RAI Pertaining to the Davis-Besse, LRA
ML11327A0792011-12-0202 December 2011
Summary of Telephone Conference Call Held on Between the U.S. Nuclear Regulatory Commission and Firstenergy Nuclear Operating Company, Concerning Requests for Additional Information Pertaining to the Davis Besse Nuclear Power Station
ML11327A0872011-12-0202 December 2011
Summary of Telephone Conference Call Held on July 27, 2011, Between the NRC and Firstenergy Nuclear Operating Company Concerning RAI Pertaining to the Davis-Besse, LRA
ML11279A2182011-10-0606 October 2011
Memo - Task Interface Agreement - Evaluation of Compliance with Code for Examination of Flange Stud Holes on the Replacement Vessel Head at the Davis-Besse Nuclear Power Station (TIA 2011-015)
ML11242A0032011-09-12012 September 2011
Summary of Conference Call Held on August 4, 2011, Between the NRC and FENOC Concerning Requests for Additional Information Pertaining to the Davis-Besse License Renewal Application
ML1122701392011-08-15015 August 2011
Request for Additional Information Response Clarification from Davis-Besse Nuclear Power Station in Support of License Renewal Application Review
ML11173A2002011-08-0101 August 2011
Summary of Public Scoping Meetingsconducted Related to the Review of the Davis-Besse Nuclear Power Station, Unit 1, LRA
ML11193A2032011-07-26026 July 2011
Final Response to TIA 2011-001, Davis-Besse Nuclear Power Station Safety-Related Batteries Electrical Separation Design and Licensing Bases
ML11174A2322011-06-21021 June 2011
for the Record-06-21-2011: NRC Ensures Public Safety Through Rigorous Oversight of Nuclear Power Plant Safety Standards
ML1108202762011-06-0303 June 2011
Summary of Site Audit Related to the Review of the License Renewal Application for Davis-Besse Nuclear Power Station, Unit 1
ML11174A2472011-05-31031 May 2011
for the Record-05-31-2011: NRC Chairman Gregory B. Jaczko'S Statement on Nrc'S Commitment to Safety
ML1110806902011-04-20020 April 2011
Notice of Meeting with First Energy Nuclear Operating Company (FENOC) to Discuss a Proposed LAR to Delete Technical Specification 5.5.8g, Steam Generator (SG) Program Auxiliary Feedwater Header Inspections
ML1028702612010-10-22022 October 2010
11/04/10 Notice of Meeting to Discuss the License Renewal Process and Environmental Scoping for Davis-Besse Nuclear Power Station License Renewal Application Review
ML1029106182010-10-14014 October 2010
Documentation of Telephone Conversation Between Mr. David Lochbaum Regarding Follow-Up Questions Related to NRC Letter Dated July 28, 2010 (ML102040807)
ML1028503032010-10-12012 October 2010
Acceptance of License Renewal Application, Davis-Besse Nuclear Power Station
ML0935101922009-12-14014 December 2009
Completion of Davis-Besse Lessons Learned Task Force Recommendation 3.3.4(8)
ML0825606772008-09-15015 September 2008
Presentation Disc
ML0814207532008-05-20020 May 2008
Summary of Public Meeting with Firstenergy Nuclear Operating Company to Discuss the 2008 Davis-Besse End-of-Cycle Performance Assessment
ML0807400842008-03-14014 March 2008
Draft Regulatory Guide for Comment
ML0723302222007-08-28028 August 2007
09/12/2007 Notice of Meeting with Firstenergy to Discuss the August 3, 2007 License Amendment Request for Conversion to Improved Technical Specifications for Davis-Besse, Unit 1
ML0722108432007-08-0707 August 2007
Request for Renewal of Deviation to the Reactor Oversight Process Action Matrix for Davis-Besse Nuclear Power Station
ML0717103462007-06-21021 June 2007
Revised Notice of Meeting with Firstenergy to Discuss Response to Nrc'S 05/14/2007, Demand for Information Regarding Fenoc'S Re-analysis of the Timeline and Root Causes for the 2002 Davis-Besse Reactor Pressure Vessel Head Degradation Event
ML0716202122007-06-13013 June 2007
Notice of Meeting with Firstenergy Regarding May 14, 2007 Demand for Information Davis-Besse
ML0712803322007-05-18018 May 2007
April 2007 Report on the Status of Public Petitions Under Title 10 of the Code of Federal Regulations (10 Cfr), Section 2.206
2023-05-04
[Table view] |
Text
September 17, 2004 MEMORANDUM TO: Nilesh Chokshi, Chief Materials Engineering Branch Division of Engineering Technology FROM: Mark T Kirk /RA/
Component Integrity Section Division of Engineering Technology THRU: Allen L. Hiser, Chief /RA/
Component Integrity Section Division of Engineering Technology
SUBJECT:
REPORTS DETAILING STRUCTURAL ANALYSIS OF CORROSION WASTAGE AT DAVIS BESSE The purpose of this memorandum is to transmit to you final reports detailing the results of our analysis and testing program aimed at investigating the structural significance of the corrosion wastage discovered in the upper head of the Davis Besse nuclear reactor vessel in February of 2002. Attached to this memorandum please find four letter reports from ORNL:
- 1. Bass, B,R., et al., Experimental Program for Investigating the Influence of Cladding Defects on Burst Pressure, Oak Ridge National Laboratory Report Number ORNL/NRC/LTR-04/13, September 2004.
- 2. Williams, P.T., Yin, S., and Bass, B.R., Probabilistic Structural Mechanics Analysis of the Degraded Davis-Besse RPV Head, Oak Ridge National Laboratory Report Number ORNL/NRC/LTR-04/15, September 2004.
- 3. Williams, P.T. and Bass, B.R., Analysis of the Davis-Besse RPV Head Wastage Area and Cavity, Oak Ridge National Laboratory Report Number ORNL/NRC/LTR-02/09, September 2004.
- 4. Williams, P.T. and Bass, B.R., Stochastic Failure Model of the Davis-Besse RPV Head, Oak Ridge National Laboratory Report Number ORNL/NRC/LTR-02/10, September 2004.
The first report concerns our probabilistic structural analysis and provides details of our forensic examinations of samples removed from the Davis Besse cladding. The second report details results of our mock-up burst tests. The results of these tests were used to develop and validate the structural model described in the first report. The third and fourth reports describe our preliminary modeling efforts. The models described in the first report evolved out of insights gained from reports three and four.
Please note that I have reviewed all of these reports for technical accuracy and to ensure that any proprietary information has been removed.
Key conclusions from these studies can be summarized as follows:
Our forensic examination of the cracks in the stainless steel cladding removed from Davis Besse reveals no evidence of tearing at the reactors operating pressure, something that would have to occur prior to any cladding failure. This finding suggests strongly that no near-term failure was likely when the plant was shut down.
Our structural analyses showed that the exposed cladding that existed on February 16, 2002, would have held until pressures reached about one and a quarter to one and a half times the normal operating pressure of 2200 psi, i.e. between 2700 and 3300 psi (5th and 95th percentile), with a median pressure estimate of 3000 psi. Uncertainties regarding the cladding material properties and the irregularity of the crack network are responsible for the range in these predicted pressure margins. It is important to note that all of these pressures exceed the safety relief valve setpoint pressure of 2500 psi.
To accurately estimate how long after February 16, 2002, the stainless steel cladding could have held would require more information on the rate at which the cavity behind the cladding was expanding and the rate at which the existing cladding cracks were growing, among other variables. Significant uncertainties remain regarding these variables, and regarding the mechanism responsible for cavity growth. By using a simplified model we have determined that Davis Besse could have continued to operate between 2 to 22 months after February 16, 2002 without failure of the RPV head.
This information has previously been reported to the EDO (see Adams ML041250112) and has been provided to Mr. Gary DeMoss of the Risk Analysis Branch to support his Accident Sequence Precursor calculations. Mr. DeMoss has reported the results of his calculations separately.
Should you have any questions or concerns please do not hesitate to contact me.
DISTRIBUTION MEB r/f DET r/f DOCUMENT NAME: C:\ORPCheckout\FileNET\ML042660384.wpd OAR in ADAMS? (Y or N) Y ADAMS ACCESSION NO.:ML042600455 TEMPLATE NO. RES-Publicly Available? (Y or N) Y DATE OF RELEASE TO PUBLIC 9-21-04 SENSITIVE?
To receive a copy of this document, indicate in the box: "C" = Copy without enclosures "E" = Copy with enclosures "N" = No copy OFFICE RES/MEB RES/MEB RES/MEB NAME M. Kirk /RA/ A. Hiser /RA/ N. Chokshi /RA/
DATE 09/17/04 09/17/04 09/17/04 OFFICIAL RECORD COPY
