ULNRC-05683, Submittal of Annual Report, ECCS Evaluation Model Revisions

Submittal of Annual Report, ECCS Evaluation Model Revisions

ML100610087
Person / Time
Site:	Callaway
Issue date:	03/01/2010
From:	Sandbothe S AmerenUE, Union Electric Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
ULNRC-05683
Download: ML100610087 (4)

Text

AmerenUE PO Box 620 Callaway Plant Fulton, MO 65251 March 1, 2010 ULNRC-05683 u.s. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 10 CFR 50.46 Ladies and Gentlemen:

~~ DOCKET NUMBER 50-483 wAmeren CALLAWAY PLANT UNION ELECTRIC COMPANY UE 10 CFR 50.46 ANNUAL REPORT ECCS EVALUATION MODEL REVISIONS

References:

1) ULNRC-05260 dated 3-9-06

2) ULNRC-05378 dated 3-7-07

3) ULNRC-05475 dated 3-4-08

4) ULNRC-05600 dated 3-4-09 AmerenUE hereby submits the annual report required per 10 CFR 50.46(a)(3) for Callaway Plant. There are no changes, error corrections, or enhancements to the Westinghouse ECCS Large Break and Small Break Loss of Coolant Accident (LOCA) Evaluation Models to report for Callaway during the time period from March 2009 to March 2010.

Attachment 2 to Reference 4 above provides the current ECCS Evaluation Model Margin Assessment which remains unchanged from 2009. Reference 4 included all peak cladding temperature (PCT) changes resulting from the resolution of prior issues as they apply to Callaway. References 1 through 4 provided annual 10 CFR 50.46 reports that were issued after the LOCA analyses were revised to reflect the installation of the replacement steam generators in 2005.

The PCT values determined in the Large Break and Small Break LOCA analyses of record, when combined with all PCT margin allocations, remain below the 2200°F regulatory limit. As such, no reanalysis is planned by AmerenUE.

This letter does not contain any new commitments. If you have any questions on this report, please contact me at (573) 676-8528 or Mr. Scott Maglio at (573) 676-8719.

a subsidiary of Ameren Corporation

ULNRC-05683 March 1,2010 Page 2 Very tml y yours, Scott Sandbothe Manager, Plant Support GGY/nis

ULNRC-05683 March 1,2010 Page 3 cc:

u.s. Nuclear Regulatory Commission (Original and 1 copy)

Attn: Document Control Desk Washington, DC 20555-0001 Mr. Elmo E. Collins, Jr.

Regional Administrator U.S. Nuclear Regulatory Commission Region IV 612 E. Lamar Blvd., Suite 400 Arlington, TX 76011-4125 Senior Resident Inspector Callaway Resident Office U.S. Nuclear Regulatory Commission 8201 NRC Road Steedman, MO 65077 Mr. Mohan C. Thadani (2 copies)

Senior Project Manager, Callaway Plant Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Mail Stop 0-8G 14 Washington, DC 20555-2738

ULNRC-05683 March 1,2010 Page 4 Index and send hardcopy to QA File A160.0761 Hardcopy:

Certrec Corporation 4200 South Hulen, Suite 630 Fort Worth, TX 76109 (Certrec receives ALL attachments as long as they are non-safeguards and may be publicly disclosed. )

Electronic distribution for the following can be made via Responses and Reports ULNRC Distribution:

A. C. Heflin F. M. Diya L. S. Sandbothe C. O. Reasoner III S. A. Maglio T. B. Elwood S. L. Gallagher T. L. Woodward (NSRB)

G. G. Yates Mr. Ron Reynolds, Director (SEMA)

Mr. Edward Gray, Senior REP Planner (SEMA)

Mr. John Campbell, REP Planner (SEMA)

Ms. Diane M. Hooper (WCNOC)

Mr. Dennis Buschbaum (Luminant Power)

Mr. Ron Barnes (APS)

Mr. Tom Baldwin (PG&E)

Mr. Wayne Harrison (STPNOC)

Mr. John O'Neill (Pillsbury Winthrop Shaw Pittman LLP)

Mr. Floyd Gilzow (DNR) 3