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| | number = ML062620149 | | | number = ML062620149 |
| | issue date = 09/21/2006 | | | issue date = 09/21/2006 |
| | title = Dresden, Units 2 & 3 and Quad Cities, Units 1 & 2 - Request for Additional Information Related to Exelon'S Extended Power Uprate Operation Commitments (TAC Nos. MD2932 & MD2933) | | | title = Request for Additional Information Related to Exelon'S Extended Power Uprate Operation Commitments (TAC Nos. MD2932 & MD2933) |
| | author name = Banerjee M | | | author name = Banerjee M |
| | author affiliation = NRC/NRR/ADRO/DORL/LPLIII-2 | | | author affiliation = NRC/NRR/ADRO/DORL/LPLIII-2 |
| | addressee name = Crane C M | | | addressee name = Crane C |
| | addressee affiliation = Exelon Generation Co, LLC | | | addressee affiliation = Exelon Generation Co, LLC |
| | docket = 05000237, 05000249, 05000254, 05000265 | | | docket = 05000237, 05000249, 05000254, 05000265 |
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MONTHYEARML0626201492006-09-21021 September 2006 Request for Additional Information Related to Exelon'S Extended Power Uprate Operation Commitments (TAC Nos. MD2932 & MD2933) Project stage: RAI ML0708200122007-03-22022 March 2007 Extended Power Uprate (EPU) Meeting, Handouts from March 22, 2007, Meeting Project stage: Request ML0708707282007-04-0404 April 2007 Summary of Meeting with Exelon Generating Company Regarding Resolution of Extended Power Uprate Issues Re Dresden and Quad Cities Project stage: Meeting 2007-03-22
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Category:Letter
MONTHYEARML24270A0332024-09-20020 September 2024 Independent Spent Fuel Storage Installation Annual Radioactive Effluent Release Report IR 05000237/20244022024-09-19019 September 2024 – Security Baseline Inspection Report 05000237/2024402 and 05000249/2024402 - (Public) ML24240A1692024-09-18018 September 2024 Cy 2023 Summary of Decommissioning Trust Fund Status ML24260A2152024-09-16016 September 2024 Confirmation of Initial License Examination IR 05000254/20244022024-09-12012 September 2024 Material Control and Accounting Program Inspection Report 05000254/2024402 and 05000265/2024402 (Public) SVP-24-054, Deviation from BWR Vessel and Internals Project (BWRVIP) Guidelines - Inspection of Top Guide Rim Welds2024-09-11011 September 2024 Deviation from BWR Vessel and Internals Project (BWRVIP) Guidelines - Inspection of Top Guide Rim Welds ML24255A8642024-09-0606 September 2024 Rscc Wire & Cable LLC Dba Marmon Industrial Energy & Infrastructure - Part 21 Retraction of Final Notification ML24249A1362024-09-0404 September 2024 EN 57304 - Westinghouse Electric Company, LLC, Final Report - No Embedded Files. Notification of the Potential Existence of Defects Pursuant to 10 CFR Part 21 IR 05000237/20230052024-08-28028 August 2024 Updated Inspection Plan and Assessment Follow-Up Letter for Dresden Nuclear Power Station, Units 2 and 3 (Report 05000237/2023005; 05000249/2024005) IR 05000254/20240052024-08-28028 August 2024 Updated Inspection Plan and Assessment Follow-Up Letter for Quad Cities Nuclear Power Station (Report 05000254/2024005; 05000265/2024005) ML24239A3972024-08-23023 August 2024 Rssc Wire & Cable LLC Dba Marmon - Part 21 Final Notification - 57243-EN 57243 RS-24-078, Alternative Request RV-08, Revision 1, Associated with Safety Relief Valve Testing Interval2024-08-20020 August 2024 Alternative Request RV-08, Revision 1, Associated with Safety Relief Valve Testing Interval ML24215A2912024-08-14014 August 2024 Request for Withholding Information from Public Disclosure Alternative Schedule to Complete Decommissioning Beyond 60-Years of Permanent Cessation of Operations IR 05000237/20240022024-08-14014 August 2024 Integrated Inspection Report 05000237/2024002 and 05000249/2024002 IR 05000237/20240102024-08-0909 August 2024 NRC Age-Related Degradation Inspection Report 05000237/2024010 and 05000249/2024010 ML24183A1082024-08-0808 August 2024 – Issuance of Amendment Nos. 302 and 298 Adoption of Tstf-505, Provide Risk Informed Extended Completion Times – RITSTF Initiative 4b SVP-24-049, Owners Activity Report Submittal Sixth 10-Year Interval 2024 Refueling Outage Activities2024-08-0707 August 2024 Owners Activity Report Submittal Sixth 10-Year Interval 2024 Refueling Outage Activities IR 05000237/20230112024-08-0707 August 2024 Reissue - Dresden Nuclear Power Station, Units 2 and 3 Comprehensive Engineering Team Inspection Report 05000237/2023011 and 05000249/2023011 IR 05000237/20200012024-08-0606 August 2024 Reissue - Dresden Nuclear Power Station, Units 2 and 3 - Integrated Inspection Report 05000237/2020001 and 05000249/2020001 ML24184A1712024-08-0202 August 2024 SLRA Schedule Letter IR 05000254/20243012024-08-0101 August 2024 NRC Initial License Examination Report 05000254/2024301; 05000265/2024301 SVP-24-048, Registration of Use of Casks to Store Spent Fuel2024-07-31031 July 2024 Registration of Use of Casks to Store Spent Fuel RS-24-073, Alternative Schedule to Complete Decommissioning Beyond 60 Years of Permanent Cessation of Operations – Additional Information Supporting Request to Withhold Security-Related Information2024-07-31031 July 2024 Alternative Schedule to Complete Decommissioning Beyond 60 Years of Permanent Cessation of Operations – Additional Information Supporting Request to Withhold Security-Related Information ML24136A1322024-07-30030 July 2024 Transmittal Letter for Renewed License ML24208A0962024-07-25025 July 2024 57243-EN 57243 - Rssc Wire & Cable LLC, Dba Marmon - Part 21 Notification ML24204A1862024-07-24024 July 2024 – Regulatory Audit in Support of License Amendment Requests to Adopt TSTF 505, Revision 2; TSTF-591, Revision 0; and 10 CFR 50.69 ML24193A0882024-07-24024 July 2024 Request for Withholding Information from Public Disclosure for Dresden Nuclear Power Station, Unit 1 Alternative Schedule to Complete Decommissioning Beyond 60-Years of Permanent Cessation of Operations (Docket 50-10) SVP-24-046, Turbine Trip and Automatic Scram Due to Digital EHC Power Supply Intermittent Failure2024-07-22022 July 2024 Turbine Trip and Automatic Scram Due to Digital EHC Power Supply Intermittent Failure RS-24-070, Independent Spent Fuel Storage Installation, Nine Mile Point, Units 1 and 2, Quad Cities, Units 1 and 2, R. E. Ginna - Nuclear Radiological Emergency Plan Document Revisions2024-07-12012 July 2024 Independent Spent Fuel Storage Installation, Nine Mile Point, Units 1 and 2, Quad Cities, Units 1 and 2, R. E. Ginna - Nuclear Radiological Emergency Plan Document Revisions SVP-24-041, Regulatory Commitment Change Summary Report2024-07-0505 July 2024 Regulatory Commitment Change Summary Report SVP-24-043, Registration of Use of Casks to Store Spent Fuel2024-07-0505 July 2024 Registration of Use of Casks to Store Spent Fuel ML24162A0982024-07-0303 July 2024 – Issuance of Amendment Nos. 301 and 297 Adoption of 10 CFR 50.69 Risk Informed Categorization and Treatment of Structures, Systems, and Components for Nuclear Power Reactors IR 05000237/20243012024-06-27027 June 2024 NRC Initial License Examination Report 05000237/2024301; 05000249/2024301 ML24138A0572024-06-26026 June 2024 – Issuance of Amendment Nos. 285 and 278 Application to Adopt TSTF-564, Safety Limit MCPR SVP-24-040, Registration of Use of Casks to Store Spent Fuel2024-06-25025 June 2024 Registration of Use of Casks to Store Spent Fuel ML24138A1812024-06-18018 June 2024 Aging Management Audit Plan Regarding the Subsequent License Renewal Application Review RS-24-061, Constellation Energy Generation, LLC, Response to NRC Regulatory Issue Summary 2024-01, Preparation and Scheduling of Operator Licensing Examinations2024-06-14014 June 2024 Constellation Energy Generation, LLC, Response to NRC Regulatory Issue Summary 2024-01, Preparation and Scheduling of Operator Licensing Examinations RS-24-063, Response to Request for Additional Information for 10 CFR 50.55a Request No. I5R-222024-06-14014 June 2024 Response to Request for Additional Information for 10 CFR 50.55a Request No. I5R-22 ML24128A2742024-06-14014 June 2024 Notice of Acceptance and Opportunity for Hearing - Letter SVP-24-039, Ile Post Exam Package Letter2024-06-12012 June 2024 Ile Post Exam Package Letter ML24156A2332024-06-11011 June 2024 Letter Supplemental Information for Alternative Schedule to Complete Decommissioning Beyond 60-Years of Permanent Cessation of Operations RS-24-053, Response to Request for Additional Information Related to License Amendment Request to Revise Technical Specifications to Adopt Risk Informed Completion Times TSTF-505, Revision 2, Provide Risk-Informed2024-06-0606 June 2024 Response to Request for Additional Information Related to License Amendment Request to Revise Technical Specifications to Adopt Risk Informed Completion Times TSTF-505, Revision 2, Provide Risk-Informed ML24151A6482024-06-0303 June 2024 Changes in Reactor Decommissioning Branch Project Management Assignments for Some Decommissioning Facilities ML24183A2752024-05-30030 May 2024 Registration of Use of Casks to Store Spent Fuel SVPLTR 24-0020, Registration of Use of Casks to Store Spent Fuel2024-05-30030 May 2024 Registration of Use of Casks to Store Spent Fuel RS-24-056, Application to Adopt 10 CFR 50.69, Risk-Informed Categorization and Treatment of Structures, Systems, and Components for Nuclear Power Reactors2024-05-28028 May 2024 Application to Adopt 10 CFR 50.69, Risk-Informed Categorization and Treatment of Structures, Systems, and Components for Nuclear Power Reactors ML24110A0492024-05-28028 May 2024 Audit Report Related to the TSTF-505 and 10 CFR 50.59 Amendments SVPLTR 24-0019, Registration of Use of Casks to Store Spent Fuel2024-05-23023 May 2024 Registration of Use of Casks to Store Spent Fuel ML24079A0762024-05-23023 May 2024 Issuance of Amendments to Adopt TSTF 264 ML24145A0432024-05-23023 May 2024 Registration of Use of Casks to Store Spent Fuel 10 CFR 72.212 2024-09-06
[Table view] Category:Request for Additional Information (RAI)
MONTHYEARML24197A0482024-07-12012 July 2024 Information Request for the Quad Cities Nuclear Station Biennial Problem Identification and Resolution Inspection ML24142A3352024-05-21021 May 2024 Quad Cities—Information Request to Support the NRC Annual Baseline Emergency Action Level and Emergency Plan Changes ML24135A0182024-05-13013 May 2024 NRR E-mail Capture - Draft Request for Additional Information Quad Cities TSTF-505 Amendment ML24102A2422024-04-10010 April 2024 NRR E-mail Capture - Draft Request for Additional Information Quad Cities TSTF-505 and 50.69 Amendments ML24066A1532024-03-0606 March 2024 NRR E-mail Capture - Request for Additional Information TSTF-505, R2, Provide Risk-Informed Extended Completion Times, RITSTF (Risk-Informed Technical Specification Task Force) Initiative 4b and 10 CFR 50.69 License Amendments ML24066A0872024-03-0404 March 2024 NRR E-mail Capture - Dresden 2 and 3 - Request for Additional Information for Alternative Request I5R-22 ML24067A1242024-03-0101 March 2024 Email to Christian Williams: Request for Additional Information Regarding Dresden Relief Request Dated February 23, 2024 ML24053A1192024-02-22022 February 2024 Request for Information for the NRC Age-Related Degradation Inspection: Inspection Report 05000265/2024010 and 05000254/2024010 ML23349A0362023-12-14014 December 2023 NRR E-mail Capture - Draft Request for Additional Information Re Quad Cities Emergency Amendment Related to Unit 1 Diesel Generator Inoperability ML23338A1192023-11-21021 November 2023 NRR E-mail Capture - Draft Request for Additional Information Quad Cities Relief Request I5R-26 ML23264A7992023-09-21021 September 2023 NRR E-mail Capture - Final RAI - Constellation Energy Generation, LLC Fleet Request License Amendment Request to Adopt TSTF-580, Revision 1 ML23187A0462023-07-0606 July 2023 Notification of NRC Baseline Inspection and Request for Information; Inspection Report 05000237/2023004 ML23118A1652023-04-28028 April 2023 NRR E-mail Capture - Request for Additional Information Quad Cities, Unit 2, Alternative Request I6R-11 ML23110A3202023-04-21021 April 2023 Information Request to Support the NRC Annual Baseline Emergency Action Level and Emergency Plan Changes Inspection ML23065A2832023-03-0707 March 2023 Request for Information for the NRC Quadrennial Comprehensive Engineering Team Inspection: Inspection Report 05000254/2023010 and 05000265/2023010 ML23052A0652023-02-21021 February 2023 NRR E-mail Capture - Dresden Units 2 and 3 - Request for Additional Information for Alternative Request RV-23H ML23037A9192023-02-0707 February 2023 Request for Information for the NRC Quadrennial Comprehensive Engineering Team Inspection: Inspection Report 05000237/2023011 and 05000249/2023011 ML23013A1502023-01-17017 January 2023 Notification of NRC Baseline Inspection and Request for Information; Inspection Report 05000254/2023002 ML23019A0132023-01-12012 January 2023 NRR E-mail Capture - Final RAI Dresden 2 and 3 - License Amendment Pertaining to GNF3 Fuel Transition ML23004A0262022-12-16016 December 2022 NRR E-mail Capture - Draft Request for Additional Information - Quad Cities Alternative RV-04, Inservice Testing of High Pressure Coolant Injection Drain Pot Solenoid Valves (EPD L-2022-LLR-0070) ML22348A0452022-12-14014 December 2022 NRR E-mail Capture - Draft Request for Additional Information Regarding Quad Cities Alternative I6R-09 ML22290A0842022-10-13013 October 2022 NRR E-mail Capture - Dresden 2 and 3 - RAI License Amendment Request Regarding New Fuel Storage Vault and Spent Fuel Storage Pool Criticality Methodologies ML22227A1152022-09-27027 September 2022 Request for Withholding Information from Public Disclosure ML22270A1032022-09-27027 September 2022 Notification of NRC Baseline Inspection and Request for Information (05000249/2022004) ML22256A0112022-09-12012 September 2022 NRR E-mail Capture - Request for Additional Information LaSalle County Station, Units 1 and 2 and Quad Cities Nuclear Power Station, Units 1 and 2 License Amendments Related to Fuel Storage ML22249A2332022-09-0606 September 2022 Notification of NRC Fire Protection Team Inspection Request for Information Inspection Report 05000254/2022011 05000265/2022011 ML22203A0442022-07-21021 July 2022 Request for Additional Information (RAI) ML22206A0352022-07-13013 July 2022 NRR E-mail Capture - Draft RAI Quad Cities Alternative Related to Sblc Nozzle Inspection ML22199A2422022-07-13013 July 2022 NRR E-mail Capture - Draft RAI Dresden 2 and 3 Proposed Alternative Related to Sblc Nozzle Inspection for the Sixth Inservice Inspection Interval ML22193A0412022-07-11011 July 2022 NRR E-mail Capture - RAI Quad Cities License Amendment to Expand the Use of Prime Methods ML22182A1992022-07-0101 July 2022 NRR E-mail Capture - RAI Alternative RV-11, Code Case OMN-28 ML22178A1362022-06-28028 June 2022 Information Request to Support Upcoming Problem Identification and Resolution (Pi&R) Inspection at Quad Cities Station ML22164A7852022-06-13013 June 2022 NRR E-mail Capture - RAI Quad Cities Amendment for Spent Fuel Pool Storage Analysis ML22164A8562022-06-13013 June 2022 NRR E-mail Capture - RAI Quad Cities Alternative RV-08, Safety Relief Valves ML22164A8582022-06-13013 June 2022 NRR E-mail Capture - RAI Alternative RV-09, MSSVs ML22076A1122022-03-15015 March 2022 Request for Additional Information Related to the Amendment Request to Transition to GNF3 Fuels (EPID L-2021-LLA-0159) (Redacted) ML22059A9902022-03-0101 March 2022 Supplemental Information Needed for Acceptance of Requested Licensing Action Amendment to Implement Prime Methodologies for Evaluating Thermal Overpower and Mechanical Overpower Limits for Non-Global Nuclear Fuels Fuel ML22041B5362022-02-10010 February 2022 NRR E-mail Capture - Constellation Energy Generation, LLC - Request for Additional Information Regarding Fleet License Amendment Request to Adopt TSTF-541 ML22039A1912022-02-0808 February 2022 Information Request for an NRC Triennial 10 CFR 50.59 (Evaluation of Changes, Tests, and Experiments) Baseline Inspection ML22020A0642022-01-13013 January 2022 NRR E-mail Capture - Exelon Generation Company, LLC - Request for Additional Information Regarding Proposed Fleet Alternative for Repair of Water Level Instrumentation Partial Penetration Nozzles ML21342A3842021-12-0808 December 2021 NRR E-mail Capture - Request for Additional Information: Quad Cities 1 & 2 License Amendment Request Transition to GNF3 Fuel ML21294A0032021-10-26026 October 2021 Supplemental Information Needed for Acceptance of Requested Licensing Action License Amendment Request Regarding Transition to GNF3 Fuel ML21256A1902021-09-10010 September 2021 NRR E-mail Capture - Exelon Generation Company, LLC - Request for Additional Information Regarding License Transfer Application ML21238A3142021-08-26026 August 2021 Notification of an NRC Triennial Heat Sink Performance Inspection and Request for Information; Inspection Report 05000254/2021004; 05000265/2021004 ML21244A4012021-08-10010 August 2021 (Final) Request for Information (RAI) Dresden, Units 1, 2, 3, and ISFSI Request for Exemptions from Portions of 10 CFR 50.47 and 10 CFR 50 Appendix E ML21190A0192021-07-0808 July 2021 NRR E-mail Capture - Exelon Fleet - Request for Additional Information Regarding Adoption of TSTF-582 and TSTF-583-T ML21144A2132021-05-24024 May 2021 NRR E-mail Capture - Exelon Generation Company, LLC - Request for Additional Information Regarding License Transfer Application ML21097A2602021-04-0808 April 2021 Notification of an NRC Biennial Licensed Operator Requalification Program Inspection and Request for Information ML21096A1752021-04-0606 April 2021 Notification of NRC Fire Protection Team Inspection Request for Information: Inspection Report 05000237/2021011; 05000249/2021011 ML21063A3202021-03-0202 March 2021 RAIs for Dresden, Units 2 and 3, Proposed Defueled Technical Specifications and Revised License Conditions for Permanently Defueled Condition (EPID L-2020-LLA-0239) (E-mail) 2024-07-12
[Table view] |
Text
September 21, 2006Mr. Christopher M. Crane President and Chief Nuclear Officer Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555
SUBJECT:
DRESDEN NUCLEAR POWER STATION, UNITS 2 AND 3, AND QUAD CITIESNUCLEAR POWER STATION, UNITS 1 AND 2 - REQUEST FOR ADDITIONAL INFORMATION RELATED TO EXELON GENERATION COMPANY, LLC'S EXTENDED POWER UPRATE OPERATION COMMITMENTS (TAC NOS. MD2932 AND MD2933)
Dear Mr. Crane:
By letter to the Nuclear Regulatory Commission (NRC) dated January 26, 2006, Exelon made aregulatory commitment to meet with NRC management to discuss the results of evaluationsperformed to support long-term operation of the Quad Cities Nuclear Power Station, Units 1 and 2 (Quad Cities), at the extended power uprate (EPU) level. The NRC staff is reviewing the modifications installed at Quad Cities and the results of the testsperformed to support EPU operation, and has determined that additional information is required to complete the review. The specific information requested is addressed in the enclosure to this letter. This request for information was electronically transmitted to your staff on August 24, 2006, and during a discussion with your staff via telephone on September 8, 2006, it was agreed that Exelon would provide a response to these questions by September 30, 2006. After the NRC staff reviews the response, we will schedule a final technical conferencecall with you to discuss the response. Once all technical issues are resolved, the management meeting mentioned above will be scheduled.
C. Crane- 2 -The NRC staff considers that timely responses to requests for additional information helpensure sufficient time is available for staff review and contribute toward the NRC's goal ofefficient and effective use of staff resources. If you should have any questions, please contact John Honcharik at (301) 415-1157.Sincerely,/RA/Maitri Banerjee, Senior Project Manager Plant Licensing Branch III-2 Division of Operating Reactor Licensing Office of Nuclear Reactor RegulationDocket Nos. 50-237, 50-249, 50-254 and 50-265
Enclosure:
RAIcc w/encl: See next page C. Crane- 3 -The NRC staff considers that timely responses to requests for additional information helpensure sufficient time is available for staff review and contribute toward the NRC's goal ofefficient and effective use of staff resources. If you should have any questions, please contact John Honcharik at (301) 415-1157.Sincerely,/RA/Maitri Banerjee, Senior Project Manager Plant Licensing Branch III-2 Division of Operating Reactor Licensing Office of Nuclear Reactor RegulationDocket Nos. 50-237, 50-249, 50-254 and 50-265
Enclosure:
RAIcc w/encl: See next pageDISTRIBUTION:PUBLICLPL3-2 R/FRidsRgn3MailCenterRidsNrrDorlLpl3-2CWu, NRRRidsNrrLADClarke RidsNrrPMJHoncharikRidsOgcRpTScarbrough, NRR RidsNrrDeEembRidsNrrDciCptbADAMS Accession Number: ML062620149 NRR-106OFFICELPL3-2/PMLPL3-2/LADE/EEMB/BCDCI/CPTB/BCLPL3-2/BCNAMEMBanerjee:mwDClarkeKManolyTLiuDCollinsDATE9/20/069/20/069/20/069/20/069/21/06OFFICIAL RECORD EnclosureREQUEST FOR ADDITIONAL INFORMATIONRELATED TO LONG-TERM EXTENDED POWER UPRATE OPERATION CONDITIONS ATQUAD CITIES NUCLEAR POWER STATION, UNITS 1 AND 2DOCKET NOS. 50-237 AND 50-249By letter to the Nuclear Regulatory Commission (NRC) dated January 26, 2006, ExelonGeneration Company, LLC (Exelon) made a regulatory commitment to meet with NRC management to discuss the results of evaluations performed to support long-term operation of the Quad Cities Nuclear Power Station, Units 1 and 2 (QC1 and QC2), at the extended poweruprate (EPU) level. The NRC staff has determined that the following information is needed inorder to complete its review:1.How will Exelon monitor the performance of the acoustic side branches (ASBs) installedat QC1 and QC2 in maintaining acceptable main steam line (MSL) pressure fluctuations and vibrations during long-term operation up to extended power uprate (EPU) conditions? For example, what are the plans for monitoring MSL strain gage and accelerometer data; performing plant walkdowns of the ASBs and MSL piping and components; inspecting and testing of MSL components (such as ASBs and electromatic relief valves); and conducting steam dryer inspections? What are the consequences associated with the loss of ASB performance (such as clogging by debris or wear of the wire mesh)? How will ASB performance degradation be addressed?2.What are the sources of new acoustic resonance peaks that appear in the MSL straingage data discussed in Exelon Report AM-2006-002 (Revision 0), "Quad Cities Unit 2 Main Steam Line Acoustic Source Identification and Recommendations for Load Reduction," and Exelon Report AM-2006-003 (Revision 0), "Quad Cities Unit 1 Main Steam Line Acoustic Source Identification and Load Reduction," submitted in Exelon letters dated May 3 and August 2, 2006, respectively, following return of the QC units to EPU operation with the ASB modifications? For example, see the resonance peak at 36 Hz in the QC1 MSL strain gage data, and the resonance peaks between 22 and 25 Hz, and at 158 Hz, in QC2 MSL strain gage data. What are the plans to ensure that such peaks do not cause unacceptable pressure loads on the steam dryer and vibrations in MSL components?3.What are the plans to ensure that extended operation of QC1 and QC2 between originallicensed thermal power (OLTP) and EPU conditions will not result in unacceptableacoustic-generated pressure fluctuations and vibrations? For example, see the resonance peaks at 127 and 143 Hz between OLTP and EPU conditions in the Structural Integrity Associates Report SIR-06-199 (May 1, 2006), "Quad Cities Unit 2 Strain Gage and Accelerometer Data Reduction Summary," referenced in Exelon Report AM-2006-002 enclosed with the licensee's submittal dated May 3, 2006. 4.Figures 10 through 13 in Exelon Report AM-2006-002 show the QC2 MSL B vibrationspectra at OLTP and EPU conditions prior to ASB installation for frequencies up to 1 kHz. The figures show harmonics at twice and three times the fundamental singing frequency (about 320 and 480 Hz). What is the potential impact of any new resonances that might be excited at higher frequencies due to the installation of the ASBs?5.In its EPU restart reports submitted on May 3 and August 6, 2006, Exelon does notinclude a revised steam dryer stress analysis for QC1 and QC2 using MSL strain gage data collected during EPU operation with the ASB modifications. As discussed in the past, the NRC staff has not accepted specific aspects of Exelon's steam dryer stress analysis. For example, the bias error and uncertainty assumptions for the acoustic circuit methodology (ACM) are not supported by a comparison of the QC2 steam dryer pressure loads calculated by the ACM during EPU operation before the ASB modifications to actual measured QC2 steam dryer data for specific frequencies intervals or steam dryer locations. Exelon has not justified the assumptions for damping applied in its steam dryer stress analysis in light of the data from the hammer tests of the replacement steam dryers. Also, the bias error/uncertainty assumptions associated with the finite element model stress-to-force transfer functions (based on comparison to dynamic hammer test data on the QC1 and QC2 replacement dryers) needs to be properly addressed. The exponent used by the licensee for the load extrapolation from maximum achieved thermal power to licensed EPU power is not clearly supported by data near the maximum achieved thermal power in the frequency range of interest.
Some uncertainties in the steam dryer stress analysis, such as load extrapolation and time shifting, appear more appropriately addressed as bias errors. With the current effectiveness of the ASBs in reducing MSL pressure fluctuations and vibrations to less than OLTP levels prior to the ASB modifications, it is not necessary to resolve these issues with Exelon's steam dryer stress analysis at this time for EPU operation of QC1 and QC2. However, these issues might need to be addressed if the ASB effectiveness becomes degraded at QC1 or QC2, or if Exelon plans to use its steam dryer stress analysis approach, along with its bias error/uncertainty assumptions, for other plants.
Dresden and Quad Cities Nuclear Power Stations cc:
Site Vice President - Dresden Nuclear Power StationExelon Generation Company, LLC 6500 N. Dresden Road Morris, IL 60450-9765Plant Manager - Dresden Nuclear Power Station Exelon Generation Company, LLC 6500 N. Dresden Road Morris, IL 60450-9765Manager Regulatory Assurance - DresdenExelon Generation Company, LLC 6500 N. Dresden Road Morris, IL 60450-9765U.S. Nuclear Regulatory CommissionDresden Resident Inspectors Office 6500 N. Dresden Road Morris, IL 60450-9766ChairmanGrundy County Board Administration Building 1320 Union Street Morris, IL 60450Regional AdministratorU.S. NRC, Region III 801 Warrenville RoadLisle, IL 60532-4351Illinois Emergency Management AgencyDivision of Disaster Assistance & Preparedness 110 East Adams Street Springfield, IL 62701-1109Document Control Desk - LicensingExelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555Senior Vice President Operations SupportExelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555Vice President - Regulatory & Legal AffairsExelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555Director - Licensing and Regulatory AffairsExelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555Assistant General CounselExelon Generation Company, LLC 200 Exelon Way Kennett Square, PA 19348Manager Licensing - Dresden & Quad CitiesExelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555Site Vice President - Quad Cities Exelon Generation Company, LLC 22710 206th Avenue N.
Cordova, IL 61242-9740Plant Manager - Quad CitiesExelon Generation Company, LLC 22710 206th Avenue N.
Cordova, IL 61242-9740Regulatory Assurance Manager - Quad CitiesExelon Generation Company, LLC 22710 206th Avenue N.
Cordova, IL 61242-9740Quad Cities Resident Inspectors OfficeU.S. Nuclear Regulatory Commission 22712 206th Avenue N.
Cordova, IL 61242David C. TubbsMidAmerican Energy Company One River Center Place 106 E. Second, P.O. Box 4350 Davenport, IA 52808-4350 Dresden and Quad Cities Nuclear Power Stations cc:Senior Vice President - Midwest OperationsExelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555Vice President - Law and Regulatory AffairsMidAmerican Energy Company One River Center Place 106 E. Second Street P.O. Box 4350 Davenport, IA 52808ChairmanRock Island County Board of Supervisors 1504 3rd Avenue Rock Island County Office Bldg.
Rock Island, IL 61201