ML043270291
| ML043270291 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 11/22/2004 |
| From: | Donohew J NRC/NRR/DLPM/LPD4 |
| To: | Randolph G Union Electric Co |
| Donohew J N, NRR/DLPM,415-1307 | |
| References | |
| Download: ML043270291 (4) | |
Text
SENSITIVE - NOT FOR PUBLIC DISCLOSURE November 22, 2004 Mr. Garry L. Randolph Vice President and Chief Nuclear Officer Union Electric Company Post Office Box 620 Fulton, MO 65251
SUBJECT:
CALLAWAY PLANT, UNIT 1 - FINAL ACCIDENT SEQUENCE PRECURSOR (ASP) ANALYSIS OF THREE 2001 OPERATIONAL CONDITIONS
Dear Mr. Randolph:
Enclosed for your information is the final Accident Sequence Precursor (ASP) analysis of three adverse conditions identified at the Callaway Plant (Callaway) in 2001. During 2001, two conditions occurred at Callaway involving foreign material that affected safety-related equipment. In February 2001, a foreign object (tygon tubing) rendered the essential service water (ESW) pump inoperable for 132 hours0.00153 days <br />0.0367 hours <br />2.18254e-4 weeks <br />5.0226e-5 months <br />. In December 2001, foreign material from the condensate storage tank (CST) caused failure of the motor-driven auxiliary feedwater (AFW) pump. The condition, a degraded floating diaphragm in the CST, had existed for more than a year. Additionally, a component cooling water (CCW) pump was inoperable for 21 days in November to December 2001, due to improper maintenance. Because the time period for the AFW pump event envelopes the ESW pump event, as well as a CCW pump event, a single assessment was performed for all three conditions.
These operational conditions are documented in licensee event reports (LERs) 483/01-002, dated April 11, 2001, and 483/02-001, dated February 1 and March 1, 2002; and in NRC Inspection Report 50-483/01-06, dated January 16, 2002. The result of the significant determination process (SDP) analysis of the NRC risk oversight process was a WHITE finding for the AFW pump event and the ESW pump event, when analyzed separately. The SDP finding for the CCW pump event was GREEN. The point estimate increase in a change in core damage frequency (CDP) for the integrated events is 1.2 x 10-5. 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). In addition, for comparison with the SDP results for single events, separate ASP analyses were performed for these three conditions, and the results for the three separate ASP analyses were similar to the SDP analysis results.
For the 2001 conditions, 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 your staff, 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 and 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."
SENSITIVE - NOT FOR PUBLIC DISCLOSURE
G. Randolph 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. Using our interim guidance, the enclosed ASP analysis has been marked as "Sensitive Information" in accordance with 10 CFR 2.390. Therefore, the staff has not made it publicly available. 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). We will inform you if the classification of the document changes as a result of our ongoing assessments.
Note that public access to ADAMS has been temporarily suspended so that security reviews of publically available documents may be performed and potentially sensitive information removed. Please check the NRC website for updates on the resumption of ADAMS public access.
If you have any questions regarding the ASP analysis, contact me at 301-415-1307.
Sincerely,
/RA/
Jack Donohew, Senior Project Manager, Section 2 Project Directorate IV Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-483
Enclosure:
Accident Sequence Prescursor Analysis (Sensitive - Not for Public Disclosure) cc w/o encl: See next page
G. Randolph November 22, 2004 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. Using our interim guidance, the enclosed ASP analysis has been marked as "Sensitive Information" in accordance with 10 CFR 2.390. Therefore, the staff has not made it publicly available. 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). We will inform you if the classification of the document changes as a result of our ongoing assessments.
Note that public access to ADAMS has been temporarily suspended so that security reviews of publically available documents may be performed and potentially sensitive information removed. Please check the NRC website for updates on the resumption of ADAMS public access.
If you have any questions regarding the ASP analysis, contact me at 301-415-1307.
Sincerely,
/RA/
Jack Donohew, Senior Project Manager, Section 2 Project Directorate IV Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-483 DISTRIBUTION:
PUBLIC
Enclosure:
As stated (Sensitive-Not for Public Disclosure) PDIV-2 Reading RidsNrrDlpmPdiv (HBerkow) cc w/o encl: See next page RidsNrrDlpmPdiv2 (RGramm)
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GDick DMarksberry, RES AGrady, RES ACCESSION NO.: ML043270291 Nrr-106 OFFICE PDIV-2/PM PDIV-2/LA PDIV-2/SC NAME JDonohew EPeyton RGramm DATE 11/17/04 11/19/04 11/18/04 DOCUMENT NAME: E:\\Filenet\\ML043270291.wpd OFFICIAL RECORD COPY
Callaway Plant, Unit 1 cc:
Professional Nuclear Consulting, Inc.
19041 Raines Drive Derwood, MD 20855 John ONeill, Esq.
Shaw, Pittman, Potts & Trowbridge 2300 N. Street, N.W.
Washington, D.C. 20037 Mr. Mark A. Reidmeyer, Regional Regulatory Affairs Supervisor Regulatory Affairs AmerenUE P.O. Box 620 Fulton, MO 65251 U.S. Nuclear Regulatory Commission Resident Inspector Office 8201 NRC Road Steedman, MO 65077-1302 Mr. Chris Younie Manager, Quality Assurance AmerenUE P.O. Box 620 Fulton, MO 65251 Manager - Electric Department Missouri Public Service Commission 301 W. High P.O. Box 360 Jefferson City, MO 65102 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-4005 Mr. Ronald A. Kucera Deputy Director for Public Policy Department of Natural Resources P.O. Box 176 Jefferson City, Missouri 65102 Mr. Rick A. Muench President and Chief Executive Officer Wolf Creek Nuclear Operating Corporation P.O. Box 411 Burlington, KA 66839 Mr. Dan I. Bolef, President Kay Drey, Representative Board of Directors Coalition for the Environment 6267 Delmar Boulevard University City, MO 63130 Mr. Lee Fritz, Presiding Commissioner Callaway County Court House 10 East Fifth Street Fulton, MO 65151 Mr. David E. Shafer Superintendent, Licensing Regulatory Affairs AmerenUE P.O. Box 66149, MC 470 St. Louis, MO 63166-6149 Mr. Keith D. Young Manager, Regulatory Affairs AmerenUE P.O. Box 620 Fulton, MO 65251 Mr. Scott Clardy, Director Section for Environmental Public Health P.O. Box 570 Jefferson City, MO 65102-0570 Certrec Corporation 4200 South Hulen, Suite 630 Fort Worth, TX 76109