ML041480136
| ML041480136 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 07/15/2004 |
| From: | Richard Guzman NRC/NRR/DLPM/LPD1 |
| To: | Vanderheyden G Calvert Cliffs |
| Guzman R, NRR/DLPM 415-1030 | |
| References | |
| Download: ML041480136 (4) | |
Text
July 15, 2004 Mr. George Vanderheyden, Vice President Calvert Cliffs Nuclear Plant, Inc.
Calvert Cliffs Nuclear Power Plant 1650 Calvert Cliffs Parkway Lusby, MD 20657-4702
SUBJECT:
CALVERT CLIFFS NUCLEAR POWER PLANT, UNIT NO. 1 RE: FINAL ACCIDENT SEQUENCE PRECURSOR ANALYSIS OF MAY 2001 OPERATIONAL CONDITION
Dear Mr. Vanderheyden:
Enclosed for your information is the final Accident Sequence Precursor (ASP) analysis of an operational condition which was identified at Calvert Cliffs Nuclear Power Plant, Unit No. 1, on May 16, 2001. The condition involved the unavailability of the turbine driven auxiliary feedwater pump for 1 year, and was described in the Nuclear Regulatory Commission (NRC) Inspection Report 50-317/01-09, dated August 24, 2001, and documented in Licensee Event Report 317/01-001. The turbine driven pump unavailability for 1 year was determined to be of moderate safety significance (Yellow) in accordance with the Significance Determination Process (SDP) as documented in the final significance determination for this issue, documented in Enforcement Action 01-206. Overall, the ASP results are consistent with the SDP finding. 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 May 2001 event, 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 Calvert Cliffs Nuclear Power Plant, Inc., 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.
G. Vanderheyden 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 301-415-1030.
Sincerely,
/RA/
Richard V. Guzman, Project Manager, Section 1 Project Directorate I Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-317
Enclosure:
As stated (Sensitive - Not for Public Disclosure) cc w/o encl: See next page
ML041480136 OFFICE PDI-1/PM PDI-1/LA PDI-1/SC NAME RGuzman SLittle RLaufer DATE 7/15/04 7/15/04 7/15/04
Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2 cc:
President Calvert County Board of Commissioners 175 Main Street Prince Frederick, MD 20678 James M. Petro, Esquire Counsel Constellation Energy Group, Inc.
750 East Pratt Street, 5th floor Baltimore, MD 21202 Jay E. Silberg, Esquire Shaw, Pittman, Potts, and Trowbridge 2300 N Street, NW Washington, DC 20037 Mark Geckle Calvert Cliffs Nuclear Power Plant 1650 Calvert Cliffs Parkway Lusby, MD 20657-4702 Resident Inspector U.S. Nuclear Regulatory Commission P.O. Box 287 St. Leonard, MD 20685 Mr. Richard I. McLean, Manager Nuclear Programs Power Plant Research Program Maryland Dept. of Natural Resources Tawes State Office Building, B3 Annapolis, MD 21401 Regional Administrator, Region I U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 Kristen A. Burger, Esquire Maryland Peoples Counsel 6 St. Paul Centre Suite 2102 Baltimore, MD 21202-1631 Patricia T. Birnie, Esquire Co-Director Maryland Safe Energy Coalition P.O. Box 33111 Baltimore, MD 21218 Mr. Loren F. Donatell NRC Technical Training Center 5700 Brainerd Road Chattanooga, TN 37411-4017