ML041730207
| ML041730207 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 07/09/2004 |
| From: | David Beaulieu NRC/NRR/DLPM/LPD3 |
| To: | O'Conner W Detroit Edison |
| Beaulieu, David, NRR/DLPM, 415-3243 | |
| References | |
| Download: ML041730207 (4) | |
Text
July 9, 2004 Mr. William T. OConnor, Jr.
Vice President - Nuclear Generation Detroit Edison Company 6400 North Dixie Highway Newport, MI 48166
SUBJECT:
FERMI 2 - FINAL ACCIDENT SEQUENCE PRECURSOR ANALYSIS OF JULY 2001 OPERATIONAL CONDITION
Dear Mr. O'Connor:
Enclosed for your information is the final accident sequence precursor (ASP) analysis of an operational condition which was discovered at Fermi 2 in July 2001. The condition involved the unavailability of Diesel Generator 14 for long mission events and inoperability for greater than the Technical Specification allowance. This condition is described in U.S. Nuclear Regulatory Commission (NRC) Inspection Report No. 50-341/00-06, dated April 27, 2001, and documented in Licensee Event Report 341/01-001, dated March 28, 2001. The diesel generator unavailability 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. The results of the final ASP analysis indicate that this condition is a precursor (i.e., the importance or change in core damage probability (CCDP) >1E-6).
For the July 2001 event, the findings in the ASP analysis regarding the 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 the Detroit Edison Company, 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 analysis has been marked as sensitive information. Therefore, the NRC 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.
W. OConnor If you have any questions regarding the analysis, please contact me at 301-415-3243.
Sincerely,
/RA/
David P. Beaulieu, Project Manager, Section 1 Project Directorate III Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-341
Enclosure:
ASP Final Analysis (Sensitive - Not for Public Disclosure) cc w/o encl: See next page
W. OConnor If you have any questions regarding the analysis, please contact me at 301-415-3243.
Sincerely,
/RA/
David P. Beaulieu, Project Manager, Section 1 Project Directorate III Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No.: 50-341
Enclosure:
ASP Final Analysis (Sensitive - Not for Public Disclosure) cc w/o encl: See next page DISTRIBUTION:
PUBLIC (Letter Only)
PDIII-1 Reading RidsNrrDlpmLpdiii1 (LRaghavan)
RidsNrrLARBouling RidsNrrPMDBeaulieu RidsOgcRp RidsAcrsAcnwMailCenter RidsRgn3MailCenter (EDuncan) pdo@nrc.gov (P. OReilly, RES)
ADAMS Accession Number: ML041730207 (Letter)
ADAMS Accession Number: ML041210788 (Enclosure - Not for Public Disclosure)
ADAMS Accession Number: ML041800422 (Package)
OFFICE PDIII-1/PM PDIII-1/LA PDIII-1/SC NAME DBeaulieu RBouling H. Chernoff for LRaghavan DATE 07/09/2004 06/30/2004 07/09/2004 OFFICIAL RECORD COPY
Fermi 2 cc w/o enclosure:
Mr. Peter Marquardt Legal Department 688 WCB Detroit Edison Company 2000 2nd Avenue Detroit, MI 48226-1279 Michigan Department of Environmental Quality Waste and Hazardous Materials Division Hazardous Waste and Radiological Protection Section Nuclear Facilities Unit Constitution Hall, Lower-Level North 525 West Allegan Street P.O. Box 30241 Lansing, MI 48909-7741 U.S. Nuclear Regulatory Commission Resident Inspectors Office 6450 W. Dixie Highway Newport, MI 48166 Monroe County Emergency Management Division 963 South Raisinville Monroe, MI 48161 Regional Administrator, Region III U.S. Nuclear Regulatory Commission 801 Warrenville Road Lisle, IL 60532-4351 Norman K. Peterson Director, Nuclear Licensing Detroit Edison Company Fermi 2 - 280 TAC 6400 North Dixie Highway Newport, MI 48166