ML041560511
| ML041560511 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 06/17/2004 |
| From: | Banerjee M NRC/NRR/DLPM/LPD3 |
| To: | Crane C Exelon Generation Co |
| Banerjee M, NRR/ADPT, 415-2277 | |
| Shared Package | |
| ML041590207 | List: |
| References | |
| EA-02-264, IR-02-021 | |
| Download: ML041560511 (4) | |
Text
June 17, 2004 Mr. Christopher M. Crane, President and Chief Nuclear Officer Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555
SUBJECT:
DRESDEN NUCLEAR POWER STATION UNIT 3 RE: FINAL ACCIDENT SEQUENCE PRECURSOR ANALYSIS OF JULY 2001 OPERATIONAL CONDITION
Dear Mr. Crane:
Enclosed for your information is the final Accident Sequence Precursor (ASP) analysis of an adverse condition which was identified at Dresden Nuclear Power Station Unit 3 in July 2001.
The condition involved an inoperable high pressure coolant injection system after a water hammer event and was described in Nuclear Regulatory Commission (NRC) Inspection Report 50-249/02-021, dated November 16, 2001, and documented in LER 249/02-005, dated February 14, 2003. The inoperable system was determined to be of low to moderate safety significance (White) in accordance with the Significance Determination Process (SDP) as documented in the final significance determination for this issue (refer to Enforcement Action 02-264). 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).
For the July 2001 condition, the findings in the ASP analysis (change in CCDP and dominant risk contributors) are consistent with those in the SDP. Since this ASP analysis confirms the results of the final significance determination, which has been reviewed by the NRC staff and Exelon Generation Company, LLC, it is being issued as a final product for information only. In the past, preliminary versions of all ASP analyses were issued for internal peer review by the NRC staff and for external peer review by the licensee. Comments received from these reviews were then resolved as part of the final analysis. To increase efficiency, we are now issuing the "noncontroversial" ASP analyses as final documents.
The NRC staff is continuing to review the appropriate classification of these documents within our records management program, considering changes in our practices following the events of September 11, 2001. Pending a final determination, the enclosed analyses have been marked as sensitive information. Therefore, the staff has not made it publicly available. Please control the document accordingly. We will inform you if the classification of the document changes as a result of our ongoing assessments. If you would like to respond to this letter and believe that
C. Crane your response may include potentially sensitive information, please discuss the matter with me prior to submitting the information.
If you have any questions regarding the analysis, please contact me at 301-415-2277.
Sincerely,
/RA/
Maitri Banerjee, Project Manager, Section 2 Project Directorate III Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No.: 50-249
Enclosure:
ASP Analysis (Sensitive - Not For Public Disclosure) cc w/o
Enclosure:
See next page
C. Crane your response may include potentially sensitive information, please discuss the matter with me prior to submitting the information.
If you have any questions regarding the analysis, please contact me at 301-415-2277.
Sincerely,
/RA/
Maitri Banerjee, Project Manager, Section 2 Project Directorate III Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No.: 50-249
Enclosure:
ASP Analysis (Sensitive - Not For Public Disclosure) cc w/o
Enclosure:
See next page DISTRIBUTION:
PUBLIC (Letter only)
PDIII/2 R/F AMendiola MBanerjee PCoates MRing, RIII AGrady, RES JAndersen ADAMS Accession Number: ML041590207 (Package)
ADAMS Accession Number: ML041560511 (Letter)
ADAMS Accession Number: ML041210885 (Enclosure - Sensitive)
OFFICE PM:PDIII-2 LA:PDIII-2 SC:PDIII-2 NAME MBanerjee PCoates AMendiola DATE 06/17/04 06/12/04 06/17/04 OFFICIAL RECORD COPY
Dresden Nuclear Power 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 U.S. NRC, Region III 801 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, Nuclear Services Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Vice President of Operations - Mid-West Boiling Water Reactors 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 Associate General Counsel Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Manager Licensing - Dresden, Quad Cities and Clinton Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555