ML032740002

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Regarding Final Accident Sequence Precursor Analysis of April 2001 Operational Event
ML032740002
Person / Time
Site: Oconee  Duke Energy icon.png
Issue date: 10/01/2003
From: Olshan L
NRC/NRR/DLPM/LPD2
To: Rosalyn Jones
Duke Energy Corp
Olshan L N, NRR/DLPM, 415-1419
References
IR-00-008
Download: ML032740002 (3)


Text

October 1, 2003 Mr. Ronald A. Jones Vice President, Oconee Site Duke Energy Corporation 7800 Rochester Highway Seneca, SC 29672

SUBJECT:

OCONEE NUCLEAR STATION, UNITS 1, 2, AND 3 RE: FINAL ACCIDENT SEQUENCE PRECURSOR ANALYSIS OF APRIL 2001 OPERATIONAL EVENT

Dear Mr. Jones:

Enclosed for your information is the final Accident Sequence Precursor (ASP) analysis of an operational event which occurred at the Oconee Nuclear Station, Units 1, 2, and 3. This condition, which has existed since the 1970s, was documented in NRC Inspection Reports 50-269/00-08, 50-270/00-08, and 50-287/00-08, dated April 30, 2001. The results of the final ASP analysis indicate that this event is a precursor [i.e., the importance or change in core damage probability >1E-6] for all three units at Oconee.

In the past, preliminary versions of all ASP analyses were issued for internal peer review by 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 non-controversial ASP analyses as final documents. In this event, the findings in the ASP analysis (i.e., the change in core damage probability and dominant risk contributors) are consistent with those in the Significance Determination Process (SDP). Since this ASP analysis confirms the results of the final SDP, that has been reviewed by the NRC staff and Duke Energy, it is being issued as a final product for information only.

Please contact me at 301-415-1419 if you have any questions regarding the enclosure.

Due to the potential sensitivity of the information described in the enclosed ASP analysis, the NRC staff has not made this Enclosure publicly available.

Sincerely,

/RA/

Leonard N. Olshan, Senior Project Manager, Section 1 Project Directorate II Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket Nos. 50-269, 50-270, and 50-287

Enclosure:

ASP Final Analysis (Sensitive - Not for Public Disclosure) cc w/o encl: See next page

ML032740002 OFFICE PDII-1/PM PDII-1/LA PDII-1/SC NAME LOlshan CHawes JNakoski DATE 9/25/2003 9/22/2003 9/26/2003

Oconee Nuclear Station cc:

Ms. Lisa F. Vaughn Duke Energy Corporation Mail Code - PB05E 422 South Church Street P.O. Box 1244 Charlotte, North Carolina 28201-1244 Anne W. Cottingham, Esquire Winston and Strawn 1400 L Street, NW Washington, DC 20005 Manager, LIS NUS Corporation 2650 McCormick Drive, 3rd Floor Clearwater, Florida 34619-1035 Senior Resident Inspector U. S. Nuclear Regulatory Commission 7812B Rochester Highway Seneca, South Carolina 29672 Mr. Henry Porter, Director Division of Radioactive Waste Management Bureau of Land and Waste Management Department of Health and Environmental Control 2600 Bull Street Columbia, South Carolina 29201-1708 Mr. Michael A. Schoppman Framatome ANP 1911 North Ft. Myer Drive Suite 705 Rosslyn, VA 22209 Mr. L. E. Nicholson Compliance Manager Duke Energy Corporation Oconee Nuclear Site 7800 Rochester Highway Seneca, South Carolina 29672 Ms. Karen E. Long Assistant Attorney General North Carolina Department of Justice P. O. Box 629 Raleigh, North Carolina 27602 Mr. C. Jeffrey Thomas Manager - Nuclear Regulatory Licensing Duke Energy Corporation 526 South Church Street Charlotte, North Carolina 28201-1006 Mr. Richard M. Fry, Director Division of Radiation Protection North Carolina Department of Environment, Health, and Natural Resources 3825 Barrett Drive Raleigh, North Carolina 27609-7721 Mr. Peter R. Harden, IV VP-Customer Relations and Sales Westinghouse Electric Company 6000 Fairview Road 12th Floor Charlotte, North Carolina 28210