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=Text=
=Text=
{{#Wiki_filter:March 13, 2009 Mr. Michael P. Gallagher Vice President License Renewal Projects Exelon Generation Company, LLC 200 Exelon Way, KSA/2-E Kennett Square, PA 19348  
{{#Wiki_filter:March 13, 2009 Mr. Michael P. Gallagher Vice President License Renewal Projects Exelon Generation Company, LLC 200 Exelon Way, KSA/2-E Kennett Square, PA 19348


==SUBJECT:==
==SUBJECT:==
SAFETY EVALUATION REPORT WITH OPEN ITEMS RELATED TO THE LICENSE RENEWAL OF THREE MILE ISLAND NUCLEAR STATION, UNIT 1  
SAFETY EVALUATION REPORT WITH OPEN ITEMS RELATED TO THE LICENSE RENEWAL OF THREE MILE ISLAND NUCLEAR STATION, UNIT 1


==Dear Mr. Gallagher:==
==Dear Mr. Gallagher:==


By letter dated January 8, 2008, AmerGen Energy Company, LLC (AmerGen or the applicant), (now Exelon Generation Company, LLC) (Exelon or the applicant), submitted, for the U.S. Nuclear Regulatory Commission's (NRC) review, an application to renew the Three Mile Island Nuclear Station, Unit 1, (TMI-1) operating license for up to an additional 20 years. The license renewal application (LRA) was submitted pursuant to Title 10 of the Code of Federal Regulations Part 54, "Requirements for Renewal of Operating Licenses for Nuclear Power Plants.The staff determined that the LRA was complete and acceptable for docketing on March 10, 2008.  
By letter dated January 8, 2008, AmerGen Energy Company, LLC (AmerGen or the applicant),
(now Exelon Generation Company, LLC) (Exelon or the applicant), submitted, for the U.S.
Nuclear Regulatory Commissions (NRC) review, an application to renew the Three Mile Island Nuclear Station, Unit 1, (TMI-1) operating license for up to an additional 20 years. The license renewal application (LRA) was submitted pursuant to Title 10 of the Code of Federal Regulations Part 54, Requirements for Renewal of Operating Licenses for Nuclear Power Plants. The staff determined that the LRA was complete and acceptable for docketing on March 10, 2008.
The staff has reviewed the TMI-1 LRA and developed the enclosed Safety Evaluation Report with Open Items Related to the License Renewal of Three Mile Island Nuclear Station, Unit 1, hereinafter referred to as the Safety Evaluation Report (SER). This SER reflects the status of the staffs review of the LRA, requests for additional information (RAIs), the applicants responses to the staffs RAIs, and other questions related to the LRA through February 20, 2009, unless otherwise noted. Issuance of the enclosed SER is an important milestone for both the applicant and the staff.
The staff has identified no open items in its review that must be resolved before it can make a final determination on the application, but has identified one confirmatory item. Upon submittal and verification of the information requested by the staff in the confirmatory item, it will be closed.
In accordance with the schedule for completing the review of the TMI-1 LRA, the applicant is requested to review the enclosed SER, verify its accuracy, and provide comments to the staff within 60 days from the date of this letter. Upcoming milestones for this project include an Advisory Committee on Reactor Safeguards meeting on April 1, 2009, and a final SER which is currently scheduled to be issued on or about July 13, 2009.


The staff has reviewed the TMI-1 LRA and developed the enclosed "Safety Evaluation Report with Open Items Related to the License Renewal of Three Mile Island Nuclear Station, Unit 1," hereinafter referred to as the Safety Evaluation Report (SER). This SER reflects the status of the staff's review of the LRA, requests for additional information (RAIs), the applicant's responses to the staff's RAIs, and other questions related to the LRA through February 20, 2009, unless otherwise noted. Issuance of the enclosed SER is an important milestone for both the applicant and the staff.
M. Gallagher                               If you have any questions regarding this matter, please contact the license renewal project manager, Jay Robinson, at 301-415-2878 or by e-mail at Jay.Robinson@nrc.gov.
The staff has identified no open items in its review that must be resolved before it can make a final determination on the application, but has identified one confirmatory item. Upon submittal and verification of the information requested by the staff in the confirmatory item, it will be closed. In accordance with the schedule for completing the review of the TMI-1 LRA, the applicant is requested to review the enclosed SER, verify its accuracy, and provide comments to the staff within 60 days from the date of this letter. Upcoming milestones for this project include an Advisory Committee on Reactor Safeguards meeting on April 1, 2009, and a final SER which is currently scheduled to be issued on or about July 13, 2009.
Sincerely,
M. Gallagher If you have any questions regarding this matter, please contact the license renewal project manager, Jay Robinson, at 301-415-2878 or by e-mail at Jay.Robinson@nrc.gov.
                                              \RA\
Sincerely, \RA\       Brian Holian, Director Division of License Renewal       Office of Nuclear Reactor Regulation Docket No. 50-289  
Brian Holian, Director Division of License Renewal Office of Nuclear Reactor Regulation Docket No. 50-289


==Enclosure:==
==Enclosure:==
As stated


cc w/encl: See next page
As stated cc w/encl: See next page


(PKG.)ML090630321, (LTR.)ML090480023, (ENCLOSURE)ML090710604 OFFICE LA:DLR PM:DLR:RPB1 BC:DLR:RPB1 BC:DLR:RER1 BC:DLR:RER2 NAME SFigueroa JRobinson DPelton JDozier RAuluck DATE 02/17/2009 03/03/2009 3/12/09 03/03/2009 03/03/2009 OFFICE PM:DLR:RPOB BC:DE:EEEB BC:DE:EMCB BC:DSS:SRXB BC:DSS:SCVB NAME JDaily RMathew MKhana GCranston RDennig DATE 03/11/2009 02/23/2009 03/04/2009 02/20/2009 02/24/2009 OFFICE BC:DSS:SBPB BC:DCI:CPNB BC:DCI:CSGB BC:DCI:CVIB BC:DRA:AFPB NAME MWaters TChan AHiser MMitchell AKlein DATE 02/27/2009 02/13/2009 02/09/2009 03/12/2009 01/30/2009 OFFICE OGC (NLO) D:DE D:DSS D:DCI D:DRA NAME BMizuno PHiland WRuland MEvans (JLubinski for) MCunningham DATE 03/11/2009 02/27/2009 03/05/2009 03/12/2009 02/26/2009 OFFICE D:DLR NAME BHolian DATE 3/13/09 Letter to M. Gallagher from B. Holian, dated March 13, 2009 DISTRIBUTION
(PKG.)ML090630321, (LTR.)ML090480023, (ENCLOSURE)ML090710604 OFFICE   LA:DLR             PM:DLR:RPB1         BC:DLR:RPB1         BC:DLR:RER1       BC:DLR:RER2 NAME     SFigueroa           JRobinson           DPelton             JDozier           RAuluck DATE     02/17/2009         03/03/2009         3/12/09             03/03/2009         03/03/2009 OFFICE   PM:DLR:RPOB         BC:DE:EEEB         BC:DE:EMCB         BC:DSS:SRXB       BC:DSS:SCVB NAME     JDaily             RMathew             MKhana             GCranston         RDennig DATE     03/11/2009         02/23/2009         03/04/2009         02/20/2009         02/24/2009 OFFICE   BC:DSS:SBPB         BC:DCI:CPNB         BC:DCI:CSGB         BC:DCI:CVIB       BC:DRA:AFPB NAME     MWaters             TChan               AHiser             MMitchell         AKlein DATE     02/27/2009         02/13/2009         02/09/2009         03/12/2009         01/30/2009 OFFICE   OGC (NLO)           D:DE               D:DSS               D:DCI             D:DRA NAME     BMizuno             PHiland             WRuland             MEvans             MCunningham (JLubinski for)
:
DATE     03/11/2009         02/27/2009         03/05/2009         03/12/2009         02/26/2009 OFFICE   D:DLR NAME     BHolian DATE     3/13/09
 
Letter to M. Gallagher from B. Holian, dated March 13, 2009 DISTRIBUTION:


==SUBJECT:==
==SUBJECT:==
SAFETY EVALUATION REPORT WITH OPEN ITEMS RELATED TO THE LICENSE RENEWAL OF THREE MILE ISLAND NUCLEAR STATION, UNIT 1  
SAFETY EVALUATION REPORT WITH OPEN ITEMS RELATED TO THE LICENSE RENEWAL OF THREE MILE ISLAND NUCLEAR STATION, UNIT 1 HARD COPY:
 
DLR RF E-MAIL:
HARD COPY: DLR RF E-MAIL: PUBLIC RidsNrrDlr RidsNrrDlrRpb1 RidsNrrDlrRpb2 RdsNrrDlrRer1 RidsNrrDlrRer2 RidsNrrDlrRerb RidsNrrDciCvib RidsNrrDciCpnb RidsNrrDraAfpb RidsNrrDeEmcb RidsNrrDeEeeb RidsNrrDssSrxb RidsNrrDssSbpb RidsNrrDssScvb RidsOgcMailCenter -------------  
PUBLIC RidsNrrDlr RidsNrrDlrRpb1 RidsNrrDlrRpb2 RdsNrrDlrRer1 RidsNrrDlrRer2 RidsNrrDlrRerb RidsNrrDciCvib RidsNrrDciCpnb RidsNrrDraAfpb RidsNrrDeEmcb RidsNrrDeEeeb RidsNrrDssSrxb RidsNrrDssSbpb RidsNrrDssScvb RidsOgcMailCenter
 
-------------
SLopas MModes, RI DKern JBrand RConte RBellamy PBamford Three Mile Island Nuclear Station, Unit 1 cc:  Site Vice President - Three Mile Island          Nuclear Station, Unit 1 Exelon Generation Company, LLC P.O. Box 480 Middletown, PA  17057 Senior Vice President - Mid-Atlantic Operations Exelon Generation Company, LLC 200 Exelon Way, KSA 3-N Kennett Square, PA  19348 Vice President - Licensing and Regulatory      Affairs Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL  60555 Regional Administrator Region I U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA  19406
SLopas MModes, RI DKern JBrand RConte RBellamy PBamford
 
Chairman Board of County Commissioners  of Dauphin County Dauphin County Courthouse Harrisburg, PA  17120
 
Chairman Board of Supervisors  of Londonderry Township R.D. #1, Geyers Church Road Middletown, PA  17057 Senior Resident Inspector (TMI-1) U.S. Nuclear Regulatory Commission P.O. Box 219 Middletown, PA  17057
 
Director - Licensing and Regulatory Affairs Exelon Generation Company, LLC Correspondence Control P.O. Box 160 Kennett Square, PA  19348 Director Bureau of Radiation Protection Pennsylvania Department of    Environmental Protection Rachel Carson State Office Building P.O. Box 8469 Harrisburg, PA  17105-8469
 
Plant Manager - Three Mile Island Nuclear    Station, Unit 1 Exelon Generation Company, LLC P. O. Box 480 Middletown, PA  17057
 
Manager, Regulatory Assurance Three Mile Island Nuclear Station, Unit 1 Exelon Generation Company, LLC P.O. Box 480 Middletown, PA  17057 Ronald Bellamy, Region I U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA  19406 Michael A. Schoppman Framatome ANP Suite 705 1911 North Ft. Myer Drive Rosslyn, VA  22209 Dr. Judith Johnsrud National Energy Committee Sierra Club 433 Orlando Avenue State College, PA  16803
 
Three Mile Island Nuclear Station,    Unit 1  cc:  Eric Epstein TMI Alert 4100 Hillsdale Road Harrisburg, PA  17112 Correspondence Control Desk Exelon Generation Company, LLC 200 Exelon Way, KSA 1-N-1 Kennett Square, PA  19348 Manager Licensing Exelon Generation Company, LLC Correspondence Control P.O. Box 160 Kennett Square, PA  19348 Christopher M. Crane President and Chief Operating Officer, Exelon Corporation Chief Operating Officer Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL  60555 


Mr. Charles G. Pardee Senior Vice President, Exelon Generation Company LLC, President & Chief Nuclear Officer, Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Mr. Michael J. Pacilio Senior Vice President, Exelon Generation Company, LLC Chief Operation Officer, Exelon Nuclear 4300 Winfield Road Warrenville, IL 60555
Three Mile Island Nuclear Station, Unit 1 cc:
Site Vice President - Three Mile Island  Director - Licensing and Regulatory Affairs Nuclear Station, Unit 1                  Exelon Generation Company, LLC Exelon Generation Company, LLC            Correspondence Control P.O. Box 480                              P.O. Box 160 Middletown, PA 17057                      Kennett Square, PA 19348 Senior Vice President - Mid-              Director Atlantic Operations                      Bureau of Radiation Protection Exelon Generation Company, LLC           Pennsylvania Department of 200 Exelon Way, KSA 3-N                    Environmental Protection Kennett Square, PA 19348                  Rachel Carson State Office Building P.O. Box 8469 Vice President - Licensing and Regulatory Harrisburg, PA 17105-8469 Affairs Exelon Generation Company, LLC           Plant Manager - Three Mile Island Nuclear 4300 Winfield Road                         Station, Unit 1 Warrenville, IL 60555                     Exelon Generation Company, LLC P. O. Box 480 Regional Administrator                    Middletown, PA 17057 Region I U.S. Nuclear Regulatory Commission        Manager, Regulatory Assurance 475 Allendale Road                        Three Mile Island Nuclear Station, Unit 1 King of Prussia, PA 19406                Exelon Generation Company, LLC P.O. Box 480 Chairman                                  Middletown, PA 17057 Board of County Commissioners of Dauphin County                        Ronald Bellamy, Region I Dauphin County Courthouse                U.S. Nuclear Regulatory Commission Harrisburg, PA 17120                      475 Allendale Road King of Prussia, PA 19406 Chairman Board of Supervisors                      Michael A. Schoppman of Londonderry Township                  Framatome ANP R.D. #1, Geyers Church Road               Suite 705 Middletown, PA 17057                      1911 North Ft. Myer Drive Rosslyn, VA 22209 Senior Resident Inspector (TMI-1)
U.S. Nuclear Regulatory Commission        Dr. Judith Johnsrud P.O. Box 219                              National Energy Committee Middletown, PA 17057                      Sierra Club 433 Orlando Avenue State College, PA 16803


Senior Vice President, Operations Support Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Associate General Counsel Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Frederick W. Polaski Manager License Renewal Exelon Nuclear 200 Exelon Way Kennett Square, PA 19348 Albert A. Fulvio License Renewal Senior Project Manager Exelon Nuclear 200 Exelon Way Kennett Square, PA 19348}}
Three Mile Island Nuclear Station,          Unit 1 cc:
Eric Epstein                                    Senior Vice President, Operations Support TMI Alert                                      Exelon Generation Company, LLC 4100 Hillsdale Road                            4300 Winfield Road Harrisburg, PA 17112                            Warrenville, IL 60555 Correspondence Control Desk                    Associate General Counsel Exelon Generation Company, LLC                 Exelon Generation Company, LLC 200 Exelon Way, KSA 1-N-1                      4300 Winfield Road Kennett Square, PA 19348                        Warrenville, IL 60555 Manager Licensing                              Frederick W. Polaski Exelon Generation Company, LLC                  Manager License Renewal Correspondence Control                          Exelon Nuclear P.O. Box 160                                    200 Exelon Way Kennett Square, PA 19348                       Kennett Square, PA 19348 Christopher M. Crane                            Albert A. Fulvio President and Chief Operating Officer, Exelon  License Renewal Senior Project Manager Corporation                                    Exelon Nuclear Chief Operating Officer Exelon Generation      200 Exelon Way Company, LLC                                    Kennett Square, PA 19348 4300 Winfield Road Warrenville, IL 60555 Mr. Charles G. Pardee Senior Vice President, Exelon Generation Company LLC, President & Chief Nuclear Officer, Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Mr. Michael J. Pacilio Senior Vice President, Exelon Generation Company, LLC Chief Operation Officer, Exelon Nuclear 4300 Winfield Road Warrenville, IL 60555}}

Latest revision as of 09:53, 14 November 2019

Safety Evaluation Report with Open Items Related to the License Renewal of Three Mile Island Nuclear Station, Unit 1
ML090480023
Person / Time
Site: Three Mile Island Constellation icon.png
Issue date: 03/13/2009
From: Brian Holian
Division of License Renewal
To: Gallagher M
Exelon Generation Co
Robinson , Jay NRR/ADRA/DPR 415-2878
Shared Package
ML090630321 List:
References
Download: ML090480023 (6)


Text

March 13, 2009 Mr. Michael P. Gallagher Vice President License Renewal Projects Exelon Generation Company, LLC 200 Exelon Way, KSA/2-E Kennett Square, PA 19348

SUBJECT:

SAFETY EVALUATION REPORT WITH OPEN ITEMS RELATED TO THE LICENSE RENEWAL OF THREE MILE ISLAND NUCLEAR STATION, UNIT 1

Dear Mr. Gallagher:

By letter dated January 8, 2008, AmerGen Energy Company, LLC (AmerGen or the applicant),

(now Exelon Generation Company, LLC) (Exelon or the applicant), submitted, for the U.S.

Nuclear Regulatory Commissions (NRC) review, an application to renew the Three Mile Island Nuclear Station, Unit 1, (TMI-1) operating license for up to an additional 20 years. The license renewal application (LRA) was submitted pursuant to Title 10 of the Code of Federal Regulations Part 54, Requirements for Renewal of Operating Licenses for Nuclear Power Plants. The staff determined that the LRA was complete and acceptable for docketing on March 10, 2008.

The staff has reviewed the TMI-1 LRA and developed the enclosed Safety Evaluation Report with Open Items Related to the License Renewal of Three Mile Island Nuclear Station, Unit 1, hereinafter referred to as the Safety Evaluation Report (SER). This SER reflects the status of the staffs review of the LRA, requests for additional information (RAIs), the applicants responses to the staffs RAIs, and other questions related to the LRA through February 20, 2009, unless otherwise noted. Issuance of the enclosed SER is an important milestone for both the applicant and the staff.

The staff has identified no open items in its review that must be resolved before it can make a final determination on the application, but has identified one confirmatory item. Upon submittal and verification of the information requested by the staff in the confirmatory item, it will be closed.

In accordance with the schedule for completing the review of the TMI-1 LRA, the applicant is requested to review the enclosed SER, verify its accuracy, and provide comments to the staff within 60 days from the date of this letter. Upcoming milestones for this project include an Advisory Committee on Reactor Safeguards meeting on April 1, 2009, and a final SER which is currently scheduled to be issued on or about July 13, 2009.

M. Gallagher If you have any questions regarding this matter, please contact the license renewal project manager, Jay Robinson, at 301-415-2878 or by e-mail at Jay.Robinson@nrc.gov.

Sincerely,

\RA\

Brian Holian, Director Division of License Renewal Office of Nuclear Reactor Regulation Docket No. 50-289

Enclosure:

As stated cc w/encl: See next page

(PKG.)ML090630321, (LTR.)ML090480023, (ENCLOSURE)ML090710604 OFFICE LA:DLR PM:DLR:RPB1 BC:DLR:RPB1 BC:DLR:RER1 BC:DLR:RER2 NAME SFigueroa JRobinson DPelton JDozier RAuluck DATE 02/17/2009 03/03/2009 3/12/09 03/03/2009 03/03/2009 OFFICE PM:DLR:RPOB BC:DE:EEEB BC:DE:EMCB BC:DSS:SRXB BC:DSS:SCVB NAME JDaily RMathew MKhana GCranston RDennig DATE 03/11/2009 02/23/2009 03/04/2009 02/20/2009 02/24/2009 OFFICE BC:DSS:SBPB BC:DCI:CPNB BC:DCI:CSGB BC:DCI:CVIB BC:DRA:AFPB NAME MWaters TChan AHiser MMitchell AKlein DATE 02/27/2009 02/13/2009 02/09/2009 03/12/2009 01/30/2009 OFFICE OGC (NLO) D:DE D:DSS D:DCI D:DRA NAME BMizuno PHiland WRuland MEvans MCunningham (JLubinski for)

DATE 03/11/2009 02/27/2009 03/05/2009 03/12/2009 02/26/2009 OFFICE D:DLR NAME BHolian DATE 3/13/09

Letter to M. Gallagher from B. Holian, dated March 13, 2009 DISTRIBUTION:

SUBJECT:

SAFETY EVALUATION REPORT WITH OPEN ITEMS RELATED TO THE LICENSE RENEWAL OF THREE MILE ISLAND NUCLEAR STATION, UNIT 1 HARD COPY:

DLR RF E-MAIL:

PUBLIC RidsNrrDlr RidsNrrDlrRpb1 RidsNrrDlrRpb2 RdsNrrDlrRer1 RidsNrrDlrRer2 RidsNrrDlrRerb RidsNrrDciCvib RidsNrrDciCpnb RidsNrrDraAfpb RidsNrrDeEmcb RidsNrrDeEeeb RidsNrrDssSrxb RidsNrrDssSbpb RidsNrrDssScvb RidsOgcMailCenter


SLopas MModes, RI DKern JBrand RConte RBellamy PBamford

Three Mile Island Nuclear Station, Unit 1 cc:

Site Vice President - Three Mile Island Director - Licensing and Regulatory Affairs Nuclear Station, Unit 1 Exelon Generation Company, LLC Exelon Generation Company, LLC Correspondence Control P.O. Box 480 P.O. Box 160 Middletown, PA 17057 Kennett Square, PA 19348 Senior Vice President - Mid- Director Atlantic Operations Bureau of Radiation Protection Exelon Generation Company, LLC Pennsylvania Department of 200 Exelon Way, KSA 3-N Environmental Protection Kennett Square, PA 19348 Rachel Carson State Office Building P.O. Box 8469 Vice President - Licensing and Regulatory Harrisburg, PA 17105-8469 Affairs Exelon Generation Company, LLC Plant Manager - Three Mile Island Nuclear 4300 Winfield Road Station, Unit 1 Warrenville, IL 60555 Exelon Generation Company, LLC P. O. Box 480 Regional Administrator Middletown, PA 17057 Region I U.S. Nuclear Regulatory Commission Manager, Regulatory Assurance 475 Allendale Road Three Mile Island Nuclear Station, Unit 1 King of Prussia, PA 19406 Exelon Generation Company, LLC P.O. Box 480 Chairman Middletown, PA 17057 Board of County Commissioners of Dauphin County Ronald Bellamy, Region I Dauphin County Courthouse U.S. Nuclear Regulatory Commission Harrisburg, PA 17120 475 Allendale Road King of Prussia, PA 19406 Chairman Board of Supervisors Michael A. Schoppman of Londonderry Township Framatome ANP R.D. #1, Geyers Church Road Suite 705 Middletown, PA 17057 1911 North Ft. Myer Drive Rosslyn, VA 22209 Senior Resident Inspector (TMI-1)

U.S. Nuclear Regulatory Commission Dr. Judith Johnsrud P.O. Box 219 National Energy Committee Middletown, PA 17057 Sierra Club 433 Orlando Avenue State College, PA 16803

Three Mile Island Nuclear Station, Unit 1 cc:

Eric Epstein Senior Vice President, Operations Support TMI Alert Exelon Generation Company, LLC 4100 Hillsdale Road 4300 Winfield Road Harrisburg, PA 17112 Warrenville, IL 60555 Correspondence Control Desk Associate General Counsel Exelon Generation Company, LLC Exelon Generation Company, LLC 200 Exelon Way, KSA 1-N-1 4300 Winfield Road Kennett Square, PA 19348 Warrenville, IL 60555 Manager Licensing Frederick W. Polaski Exelon Generation Company, LLC Manager License Renewal Correspondence Control Exelon Nuclear P.O. Box 160 200 Exelon Way Kennett Square, PA 19348 Kennett Square, PA 19348 Christopher M. Crane Albert A. Fulvio President and Chief Operating Officer, Exelon License Renewal Senior Project Manager Corporation Exelon Nuclear Chief Operating Officer Exelon Generation 200 Exelon Way Company, LLC Kennett Square, PA 19348 4300 Winfield Road Warrenville, IL 60555 Mr. Charles G. Pardee Senior Vice President, Exelon Generation Company LLC, President & Chief Nuclear Officer, Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Mr. Michael J. Pacilio Senior Vice President, Exelon Generation Company, LLC Chief Operation Officer, Exelon Nuclear 4300 Winfield Road Warrenville, IL 60555