ML043280315
| ML043280315 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 11/29/2004 |
| From: | Chernoff H NRC/NRR/DLPM/LPD3 |
| To: | Koehl D Nuclear Management Co |
| Chernoff, H, NRR/DLPM, 301-415-4018 | |
| References | |
| IR-02-015 | |
| Download: ML043280315 (4) | |
Text
SENSITIVE - NOT FOR PUBLIC DISCLOSURE SENSITIVE - NOT FOR PUBLIC DISCLOSURE November 29, 2004 Dennis Koehl Site Vice President Point Beach Nuclear Plant Nuclear Management Company, LLC 6610 Nuclear Road Two Rivers, WI 54241-9516
SUBJECT:
POINT BEACH NUCLEAR PLANT, UNITS 1 & 2, RE: FINAL ACCIDENT SEQUENCE PRECURSOR ANALYSIS OF OCTOBER 2002 OPERATIONAL CONDITION
Dear Mr. Koehl:
Enclosed for your information is the final Accident Sequence Precursor (ASP) analysis of an adverse condition which was identified at Point Beach Nuclear Plant (PBNP), Units 1 & 2 in October 2002. This condition involved a design deficiency in the flow-restricting orifices in the auxiliary feedwater (AFW) pumps recirculation lines. It is described in Nuclear Regulatory Commission (NRC) Inspection Reports No. 50-266/02-015 and 50-301/02-015, dated April 2, 2003, and documented in LER 266/02-003, Revision 1, dated October 10, 2003.
The risk significance associated with this condition was a Yellow finding under the Significance Determination Process (SDP) for PBNP, Unit 1 and a Red finding for PBNP, Unit 2. This condition was determined to be of high safety significance in accordance with the SDP as documented in the final significance determination for this issue, Enforcement Action 03-059.
The ASP analysis calculated a mean change in core damage probability (CDP) of 6.0 x 10-5 for PBNP, Unit 1 and 3.6 x 10-4 for PBNP, Unit 2. 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) > 1 x 10-6).
For the October 2002 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 Nuclear Management 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.
Document transmitted herewith contains sensitive unclassified information. When separated from the enclosure, this document is decontrolled
D. Koehl The NRC staff is continuing to review the appropriate classification of these documents within our records management, considering changes in our practices following the events of September 11, 2001. Using our interim guidance, the enclosed analysis have been marked as "Sensitive Information" in accordance with Section 2.390 of Title 10 of the Code of Federal Regulations. Please control the document accordingly (i.e., treat the document as if you had determined that it contained trade secrets and commercial or financial information that you considered privileged or confidential). The NRC staff will inform you if the classification of the document changes as a result of our ongoing assessments.
If you have any questions regarding the analysis, please contact me at 301-415-4018.
Sincerely,
/RA/
Harold K. Chernoff, Project Manager, Section 1 Project Directorate III Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket Nos. 50-266 and 50-301
Enclosure:
As stated (Sensitive) cc w/o encl: See next page
ML043280315 (Letter)
ML042360145 (Enclosure)
ML043340336 (Package)
OFFICE PDIII-1/PM PDIII-1/LA PDIII-1/SC NAME HChernoff DClarke LRaghavan DATE 11/29/04 11/29/04 11/29/04
Point Beach Nuclear Plant, Units 1 and 2 cc:
Jonathan Rogoff, Esquire Vice President, Counsel & Secretary Nuclear Management Company, LLC 700 First Street Hudson, WI 54016 Mr. F. D. Kuester President & Chief Executive Officer WE Generation 231 West Michigan Street Milwaukee, WI 53201 Regulatory Affairs Manager Point Beach Nuclear Plant Nuclear Management Company, LLC 6610 Nuclear Road Two Rivers, WI 54241 Mr. Ken Duveneck Town Chairman Town of Two Creeks 13017 State Highway 42 Mishicot, WI 54228 Chairman Public Service Commission of Wisconsin P.O. Box 7854 Madison, WI 53707-7854 Regional Administrator, Region III U.S. Nuclear Regulatory Commission 801 Warrenville Road Lisle, IL 60532-4351 Resident Inspector's Office U.S. Nuclear Regulatory Commission 6612 Nuclear Road Two Rivers, WI 54241 Mr. Jeffery Kitsembel Electric Division Public Service Commission of Wisconsin P.O. Box 7854 Madison, WI 53707-7854 Nuclear Asset Manager Wisconsin Electric Power Company 231 West Michigan Street Milwaukee, WI 53201 John Paul Cowan Executive Vice President & Chief Nuclear Officer Nuclear Management Company, LLC 700 First Street Hudson, WI 54016 Douglas E. Cooper Senior Vice President - Group Operations Palisades Nuclear Plant Nuclear Management Company, LLC 27780 Blue Star Memorial Highway Covert, MI 49043 Site Director of Operations Nuclear Management Company, LLC 6610 Nuclear Road Two Rivers, WI 54241