ML061310141
| ML061310141 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 06/09/2006 |
| From: | Banerjee M Plant Licensing Branch III-2 |
| To: | Crane C Exelon Generation Co, Exelon Nuclear |
| Maitri Banerjee X2277 | |
| Shared Package | |
| ML061310146 | List: |
| References | |
| Download: ML061310141 (3) | |
Text
June 9, 2006 Mr. Christopher M. Crane, President Exelon Nuclear Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555
SUBJECT:
DRESDEN NUCLEAR POWER STATION, UNITS 2 AND 3 - FINAL ACCIDENT SEQUENCE PRECURSOR ANALYSIS OF MAY 2004 LOSS OF OFF-SITE POWER EVENT
Dear Mr. Crane:
Enclosed for your information is the final accident sequence precursor (ASP) analysis of an event which occurred at Dresden Nuclear Power Station (Dresden) in May 2004. This involved a scram of Dresden, Unit 3 due to a loss of offsite power (LOOP), and subsequent inoperability of the standby gas treatment system for Dresden, Units 2 and 3 (Licensee Event Report 249/04-003). The LOOP event resulted in a special inspection performed by the Nuclear Regulatory Commission (NRC), and the inspection findings are discussed in the Dresden, Unit 3, NRC Special Inspection Report 05000249/2004009, dated June 21, 2004 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML041730504). The NRCs Significant Determination Process Phase 1 assessment found that the performance deficiency would have resulted in low risk significance. The results of the final ASP analysis indicate that this condition is an accident precursor (i.e., a condition which results in a change in conditional core damage probability (CCDP) > 1E-6),
as the ASP analysis calculated a mean CCDP of 2.8xE-6.
The enclosed analysis, also available under ADAMS Accession No. ML060240407, has been marked as non-sensitive information, and is publicly available.
If you have any questions regarding the analysis, please contact me at 301-415-2277.
Sincerely,
/RA/
Maitri Banerjee, Senior Project Manager Plant Licensing Branch III-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-237 and 50-249
Enclosure:
Final Precursor Analysis cc w/o encl: See next page
ML060240407, has been marked as non-sensitive information, and is publicly available.
If you have any questions regarding the analysis, please contact me at 301-415-2277.
Sincerely,
/RA/
Maitri Banerjee, Senior Project Manager Plant Licensing Branch III-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-237 and 50-249
Enclosure:
Final Precursor Analysis cc w/o encl: See next page DISTRIBUTION:
PUBLIC LPL3-2 R/F RidsNrrDorlLplL3-2 RidsNRRPMMBanerjee RidsNrrLADClarke RidsAcrsAcnwMailCenter RidsOgcRp RidsRgn3MailCenter RidsNrrDorlDpr ADAMS Accession Numbers: Package:
ML061310146 Letter: ML061310141
Enclosure:
ML060240407 OFFICE LPL3-2/PM LPL3-2/LA LPL3-2/BC NAME MBanerjee:ca DClarke DCollins DATE 5/26/2006 5/25/2006 6/9/2006
Dresden Nuclear Power Station, Units 2 and 3 cc:
Site Vice President - Dresden Nuclear Power Station Exelon Generation Company, LLC 6500 N. Dresden Road Morris, IL 60450-9765 Dresden Nuclear Power Station Plant Manager Exelon Generation Company, LLC 6500 N. Dresden Road Morris, IL 60450-9765 Regulatory Assurance Manager - Dresden Exelon Generation Company, LLC 6500 N. Dresden Road Morris, IL 60450-9765 U.S. Nuclear Regulatory Commission Dresden Resident Inspectors Office 6500 N. Dresden Road Morris, IL 60450-9766 Chairman Grundy County Board Administration Building 1320 Union Street Morris, IL 60450 Regional Administrator, Region III U.S. Nuclear Regulatory Commission Suite 210 2443 Warrenville Road Lisle, IL 60532-4351 Illinois Emergency Management Agency Division of Disaster Assistance &
Preparedness 110 East Adams Street Springfield, IL 62701-1109 Document Control Desk - Licensing Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Senior Vice President of Operations Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Vice President - Licensing and Regulatory Affairs Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Director - Licensing and Regulatory Affairs Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Assistant General Counsel Exelon Generation Company, LLC 200 Exelon Way Kennett Square, PA 19348 Manager Licensing - Dresden, Quad Cities and Clinton Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555