ML092180406
| ML092180406 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 08/03/2009 |
| From: | Geer T Duke Energy Carolinas |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML092180406 (5) | |
Text
THOMAS C. GEER
~Duke Vice President Energy Nuclear Engineering Duke Energy Corporation August 3, 2009 526 South Church St.
Charlotte, NC 28202 U. S. Nuclear Regulatory Commission Mailing Address:
EC08H / PO Box 1006 Washington, D. C. 20555-001 Charlotte, NC 28201-1006 Attention: Document Control Desk 704 382 4712 704 382 7852 fax
Subject:
Duke Energy Carolinas, LLC (Duke) tcgeer@duke-energy.com 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 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, 2008 to December 31, 2008.
During this time reporting period, there were no errors identified in the application of the large break loss of coolant accident (LBLOCA) evaluation model (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 Unit 2 began operation with Mark (Mk)-B-HTP fuel during the fall of 2008.
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 for Units 1, 2, and 3, and Mk-B-HTP mixed core PCT summary tables for Oconee Unit 2.
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 74wu-2 www. duke-energy. corn
U.S. Nuclear Regulatory Commission August 3, 2009 Page 2 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 2 xc: (with attachments)
L. A. Reyes, Region II Administrator U.S. Nuclear Regulatory Commission Sam Nunn Atlanta Federal Center, 23 T85 61 Forsyth St., SW Atlanta, GA 30303-8931 J. F. Stang, Senior Project Manager (ONS)
U. S. Nuclear Regulatory Commission 11555 Rockville Pike Mail Stop 0-8 G9A Rockville, MD 20852-2738 E. T. Riggs, Acting NRC Senior Resident Inspector Oconee Nuclear Station
ATTACHMENT Table 1 - Peak Cladding Temperature Summary - Oconee Units 1, 2, and 3 Table 2: Mk-B-HTP Mixed Core Peak Cladding Temperature Summary - Oconee 2
Table 1: Mk-B1 I 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 1
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", July 29, 2008.
Table 2: Mk-B-HTP Mixed Core Peak Cladding Temperature Summary - Oconee Unit 2 LBLOCA PCT(°F)
Comments Evaluation model: RELAP5/MOD2-B&W Analysis of record PCT 2020 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 POT 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 Net change in PCT for this report 0
Final PCT 1788