ML101670086
| ML101670086 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 06/10/2010 |
| From: | Geer T Duke Energy Carolinas |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML101670086 (5) | |
Text
Thomas C. Geer Duke Vice President Mid9Energy 10 CFR 50.46 Nuclear Engineering Duke Energy Corporation 526 South Church Street Charlotte, NC 28202 Mailing Address:
June 10, 2010 EC08H/P. 0. Box 1006 Charlotte, NC 28201-1006 U. S. Nuclear Regulatory Commission 704 382 4712.
Washington, D. C. 20555-001 704 382 7852 fax Attention: Document Control Desk Tom. Geer@duke-energy.com
Subject:
Duke Energy Carolinas, LLC (Duke Energy)
Oconee Nuclear Station, Units 1, 2, and 3 Docket Numbers 50-269, 50-270, and 50-287 Report Pursuant to 10 CFR 50.46, Changes to or Errors in an ECCS Evaluation Model 10 CFR 50.46 (a)(3)(ii) requires the reporting of changes to or errors in Emergency Core Cooling (ECCS) evaluation models (EMs). This report covers the time period from January 1, 2009 to December 31, 2009.
During this time reporting period, there were no errors identified in the application of the large break loss of coolant accident (LBLOCA) EM or the small break loss of coolant accident (SBLOCA) EM.
However, there was a fuel design change identified during this reporting period as Oconee Units 1 and 3 began operation-with Mark (Mk)-B-HTP fuel. Mk-B-HTP LBLOCA analyses were performed to define the allowable LOCA linear heat rate (LHR) limits and determine the corresponding peak clad temperatures (PCTs) in a mixed core configuration with Mk-B1 1 fuel.
Mk-B-HTP'SBLOCA analyses were also performed to define the maximum PCT for Mk-B-HTP fuel in a mixed core configuration with Mk-B1 1 fuel. The continued applicability of the Mk-B1 1 LBLOCA and SBLOCA analyses for a mixed core configuration were also verified.
Included in this report are Mk-B1 1 fuel PCT summary tables and Mk-B-HTP mixed core PCT summary tables for Units 1, 2, and 3.
There are no regulatory commitments associated with this letter.
Please address any comments or questions regarding this matter to L. B. Jones at (704) 382-4753.
Sincerely, Thomas C. Geer Vice President, Nuclear Engineering Attachments Table 1 - Mk-B1 1 Peak Cladding Temperature Summary - Oconee Units 1, 2, and 3 Table 2 - Mk-B-HTP Mixed Core Peak Cladding Temperature Summary - Oconee Units 1, 2, and 3 www.duke-energy.corn
U.S. Nuclear Regulatory Commission June 10, 2010 Page 2 xc: (with attachments)
L. A. Reyes, Region II Administrator U.S. Nuclear Regulatory Commission Marquis One Tower 245 Peachtree Center Avenue NE, Suite 1200 Atlanta, GA 30303-1257 J. F. Stang, Senior Project Manager (ONS)
U. S. Nuclear Regulatory Commission 11555 Rockville Pike Mail Stop 0-8 G9A Rockville, MD 20852-2738 A. T. Sabisch, NRC Senior Resident Inspector Oconee Nuclear Station
ATTACHMENTS Table 1 - Peak Cladding Temperature Summary - Oconee Units 1, 2, and 3 Table 2 - Mk-B-HTP Mixed Core Peak Cladding Temperature Summary -
Oconee Units 1, 2, and 3
Table 1: Mk-B11 Peak Cladding Temperature Summary - Oconee Units 1, 2, and 3 LBLOCA PCT(°F)
Comments Evaluation model: RELAP5/MOD2-B&W Analysis of record PCT 2035 Mark-B1 1 (M5), 17.7 kW/ft at 6.021 ft elevation Prior errors (APCT)
- 1. Energy Deposition Factor 0
Reference A (see below)
- 2.
Input error to RBCU heat removal rate curve fit 0
- 3. CONTEMPT mass and energy input time step 0
- 4. Typo on containment pressure response value 0
Prior evaluation model changes (APCT)
- 1. None 0
Errors (APCT)
- 1. None 0
Evaluation model changes (APCT)
- 1. None 0
Absolute value of errors/changes for this report (APCT) 0 Net change in PCT for this report 0
Comments Evaluation model: RELAP5/MOD2-B&W Analysis of record PCT 1461 Full Power -100% FP (2 HPI Case) 0.15 ft2 break Prior errors (APCT)
- 1. None 0
Prior evaluation model changes (APCT)
- 1. None 0
Errors (APCT)
- 1. None 0
Evaluation model changes (APCT)
- 1. None 0
Absolute value of errors/changes for this report (APCT) 0 Net change in PCT for this report 0
Comments Analysis of record PCT 1774 Reduced Power - 75% FP (1 HPI case) 0.075 ft2 break Prior errors (APCT)
- 1. None 0
Prior evaluation model changes (APCT)
- 1. None 0
Errors (APCT)
- 1. None 0
Evaluation model changes (APCT)
- 1. None 0
Absolute value of errors/changes for this report (APCT) 0 Net change in PCT for this report 0
Final PCT 1774 Reference A: letter, T. C. Geer (Duke) to USNRC, "Report Pursuant to 10 CFR 50.46, Changes to or Errors in an ECCS Evaluation Model", August 3, 2009,.
Table 2: Mk-B-HTP Mixed Core Peak Cladding Temperature Summary - Oconee Units 1, 2, and 3 LBLOCA PCT(°F)
Comments Evaluation model: RELAP5/MOD2-B&W Analysis of record PCT 2020 Mark-B-HTP Mixed core, 17.6 kW/ft at 2.506 ft elevation Prior errors (APCT)
- 1. Not Applicable (Mk-B-HTP fuel loaded in 2008)
N/A Prior evaluation model changes (APCT)
- 1. Not Applicable (Mk-B-HTP fuel loaded in 2008)
N/A Errors (APCT)
- 1. None 0
Evaluation model changes (APCT)
- 1. None 0
Absolute value of errors/changes for this report (APCT) 0 Net change in PCT for this report 0
Comments Evaluation model: RELAP5/MOD2-B&W Analysis of record PCT 1397 Full Power -100% FP (2 HPI Case) 0.15 ft2 break Prior errors (APCT)
- 1. Not Applicable (Mk-B-HTP fuel loaded in 2008)
N/A, Prior evaluation model changes (APCT)
- 1. Not Applicable (Mk-B-HTP fuel loaded in 2008)
N/A Errors (APCT)
- 1. None 0
Evaluation model changes (APCT)
- 1. None 0
Absolute value of errors/changes for this report (APCT) 0 Net change in PCT for this report 0
Comments Analysis of record PCT 1788 Reduced Power - 75% FP (1 HPI case) 0.075 ft2 break Prior errors (APCT)
- 1. Not Applicable (New Analysis performed in 2008)
N/A Prior evaluation model changes (APCT)
- 1. Not Applicable (New Analysis performed in 2008)
N/A Errors (APCT)
- 1. None 0
Evaluation model changes (APCT)
- 1.,None 0
Absolute value of errors/changes for this report (APCT),
0 1
Net change in PCT for this report 0
Final PCT 1788