ML041490077
| ML041490077 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 06/09/2004 |
| From: | Travis Tate NRC/NRR/DLPM/LPD1 |
| To: | Crane C Exelon Generation Co, Exelon Nuclear |
| Tate T, NRR/DLPM, 415-8474 | |
| Shared Package | |
| ML041610019 | List: |
| References | |
| IR-01-011 | |
| Download: ML041490077 (5) | |
Text
June 9, 2004 Mr. Christopher M. Crane President and Chief Nuclear Officer Exelon Nuclear Exelon Generation Company, LLC 200 Exelon Way, KSA 3-E Kennett Square, PA 19348
SUBJECT:
LIMERICK GENERATING STATION, UNIT 2, RE: FINAL ACCIDENT SEQUENCE PRECURSOR ANALYSIS OF FEBRUARY 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 Limerick Generating Station, Unit 2, in February 2001.
The condition involved the inadvertent opening of a main steam relief valve, and is described in Nuclear Regulatory Commission (NRC) Inspection Report 50-353/01-011 dated April 24, 2001, and documented in License Event Report 353/01-001. This condition 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, Enforcement Action 01-293. 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 February 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.
C. Crane 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 have any questions regarding the analysis, please contact me at 301-415-8474.
Sincerely,
/RA/
Travis L. Tate, Project Manager, Section 2 Project Directorate I Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-353
Enclosure:
Final Precursor Analysis (Sensitive - Not for Public Disclosure) cc w/o encl: See next page
C. Crane 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 have any questions regarding the analysis, please contact me at 301-415-8474.
Sincerely,
/RA/
Travis L. Tate, Project Manager, Section 2 Project Directorate I Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-353
Enclosure:
Final Precursor Analysis (Sensitive - Not for Public Disclosure) cc w/o encl: See next page DISTRIBUTION:
PUBLIC (Letter only)
MOBrien SRosenberg DMarksberry CBixler, RGN I PDI-2 R/F JClifford TTate AGrady GDemoss Accession Numbers: Package ML041610019 Letter ML041490077 Enclosure ML041210875 OFFICE PDI-2/PM PDI-2/LA PDI-2/SC NAME SWall for TTate MO'Brien JClifford DATE 6/8/04 6/8/04 6/8/04 OFFICIAL RECORD COPY
Limerick Generating Station, Unit Nos. 1 and 2 cc:
Site Vice President Limerick Generating Station Exelon Generation Company, LLC P.O. Box 2300 Sanatoga, PA 19464 Plant Manager Limerick Generating Station Exelon Generation Company, LLC P.O. Box 2300 Sanatoga, PA 19464 Regulatory Assurance Manager - Limerick Exelon Generation Company, LLC P.O. Box 2300 Sanatoga, PA 19464 Senior Vice President - Nuclear Services Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Vice President - Operations, Mid-Atlantic Exelon Generation Company, LLC 200 Exelon Way, KSA 3-N Kennett Square, PA 19348 Vice President Licensing and Regulatory Affairs Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Director Licensing Licensing and Regulatory Affairs Exelon Generation Company, LLC 200 Exelon Way, KSA 3-E Kennett Square, PA 19348 Manager Licensing Limerick Generating Station Exelon Generation Company, LLC 200 Exelon Way, KSA 3-E Kennett Square, PA 19348 Associate General Counsel Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Correspondence Control Desk Exelon Generation Company, LLC P.O. Box 160 Kennett Square, PA 19348 Regional Administrator, Region I U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 Senior Resident Inspector U.S. Nuclear Regulatory Commission Limerick Generating Station P.O. Box 596 Pottstown, PA 19464 Library U.S. Nuclear Regulatory Commission Region I 475 Allendale Road King of Prussia, PA 19406 Chief-Division of Nuclear Safety PA Dept. of Environmental Resources P.O. Box 8469 Harrisburg, PA 17105-8469 Chairman Board of Supervisors of Limerick Township 646 West Ridge Pike Linfield, PA 19468 Dr. Judith Johnsrud National Energy Committee Sierra Club 433 Orlando Avenue State College, PA 16803