ML12104A032
| ML12104A032 | |
| Person / Time | |
|---|---|
| Site: | Mcguire, Catawba, McGuire  |
| Issue date: | 04/16/2012 |
| From: | Jacqueline Thompson Plant Licensing Branch II |
| To: | Morris J, Repko R Duke Energy Carolinas |
| Thompson J | |
| References | |
| TAC ME8215, TAC ME8216, TAC ME8217, TAC ME8218 | |
| Download: ML12104A032 (3) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 April 16, 2012 Mr. J. R. Morris Site Vice President Catawba Nuclear Station Duke Energy Carolinas, LLC 4800 Concord Road York, SC 2974S Mr. Regis T. Repko Vice President McGuire Nuclear Station Duke Energy Carolinas, LLC 12700 Hagers Ferry Road Huntersville, NC 28078
SUBJECT:
CATAWBA NUCLEAR STATION, UNITS 1 AND 2 (CATAWBA 1 AND 2),
MCGUIRE NUCLEAR STATION, UNITS 1 AND 2 (MCGUIRE 1 AND 2)
CLOSEOUT OF INFORMATION REQUEST PURSUANT TO 10 CFR SO.S4(f)
RELATED TO THE ESTIMATED EFFECT ON PEAK CLADDING TEMPERATURE RESULTING FROM THERMAL CONDUCTIVITY DEGRADATION IN THE WESTINGHOUSE-FURNISHED REALISTIC EMERGENCY CORE COOLING SYSTEM EVALUATION (TAC NOS. ME821S, ME8216, ME8217, AND ME8218)
Dear Messrs. Morris and Repko:
By letter dated February 16, 2012, the U.S. Nuclear Regulatory Commission (NRC) issued a letter in accordance with Title 10 of the Code of Federal Regulations (10 CFR), Part SO, Section SO.S4(f). Pursuant to this regulation, the NRC staff requested that you provide further information regarding the effect of a potentially significant error, as defined in 10 CFR S0.46(a)(3)(i), associated with thermal conductivity degradation (TCD), on peak cladding temperature in the Westinghouse-furnished realistic emergency core cooling system evaluation models. The requested information would enable the NRC staff to determine compliance with the Catawba 1 and 2 and McGuire 1 and 2 licensing bases, which include the requirements of 10 CFR S0.46(a)(3)(ii), concerning the reporting of errors and changes to the emergency core cooling system evaluation model.
Specifically, the subject letter required that you provide information within 30 days of February 16, 2012, to address the following issues:
(1) An estimation of the effect of the thermal conductivity degradation error on the peak fuel cladding temperature calculation for the emergency core cooling system evaluations at Catawba 1 and 2 and McGuire 1 and 2.
J. Morris and R. Repko
- 2 (2) A description of the methodology and assumptions used to determine the estimates.
This description shall include consideration of experimental data relevant to thermal conductivity degradation and specific information regarding any computer code model changes which were necessary to address these data.
By letter dated March 16, 2012, you submitted a response to the 10 CFR 50.54(f) information request for Catawba 1 and 2 and McGuire 1 and 2. The NRC staff has reviewed your submitted information and determined that for Catawba 1 and 2 and McGuire 1 and 2, your response provides the information required to be responsive to the issues discussed above. In addition, the NRC staff determined that your response, which included a report pursuant to 10 CFR 50.46(a)(3)(ii), demonstrates that your facilities have complied with the applicable reporting requirements. Therefore, the actions under 10 CFR 50.54(f) are closed.
After review of the 10 CFR 50.46(a)(3) report, the NRC staff has determined that additional information will be required to verify the adequacy of your emergency core cooling system evaluation model. Therefore, while the information provided pursuant to 10 CFR 50.54(f) enabled the NRC staff to close this action, the NRC staff has initiated separate actions to request for additional information under the auspices of 10 CFR 50.46.
If you have any questions on this matter, please contact me at 301-415-1119.
Sincerely, Jon Thompson, Project Manager Plant Licensing Branch 11-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-413,50-414,50-369, and 50-370
Enclosure:
As stated cc w/encl: Distribution via Listserv
ML12104A032 NRR/LPL2-1/PM NRR/LPL2-1/LA NRR/LPL2-1/BC NRR/LPL2-1/PM JThompson SFigueroa NSalgado JThompson 04/16/12 04/16/12 04/16/12 04/16/12