ML060530500
| ML060530500 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 02/28/2006 |
| From: | Hackett E Plant Licensing Branch III-2 |
| To: | Brandi Hamilton Duke Energy Corp |
| Olshan L N, NRR/DORL, 415-1419 | |
| References | |
| TAC MC4608, TAC MC4609, TAC MC4610, TAC MC5457, Y020040261 Y020040261 | |
| Download: ML060530500 (4) | |
Text
February 28, 2006 Mr. Bruce H. Hamilton Vice President, Oconee Site Duke Energy Corporation 7800 Rochester Highway Seneca, SC 29672
SUBJECT:
OCONEE NUCLEAR STATION, UNITS 1, 2, AND 3 (OCONEE) - TORNADO AND HIGH ENERGY LINE BREAK LICENSING BASIS ISSUES (TAC NOS.
MC4608, MC4609, MC4610, AND MC5457)
Dear Mr. Hamilton:
This is in response to your letter dated January 31, 2006, concerning project plans for tornado and high energy line break (HELB) events outside containment. The Nuclear Regulatory Commission (NRC) staff is encouraged by the formation of your tornado/HELB task force and the resultant information presented in your letter, as well as in the follow-up meeting of February 7, 2006. Such an effort is a positive step toward resolving the long-standing tornado and HELB licensing-basis issues at Oconee.
As we discussed during the February 7th meeting, to sustain substantive progress it is imperative that clear, frequent, and open communications transpire between your staff and the NRC staff. I believe that routine public meetings between NRC and Duke Energy management to discuss progress and identify issues requiring clarification are an important element of communication strategy.
In addition to routine management meetings, we have established two primary points of contact; Leonard Olshan for the Office of Nuclear Reactor Regulation (NRR)-related actions and Robert Carroll for the Region II (RII)-related actions. Futhermore, technical leads have already been designated to support the review of your planned license submittals addressing:
(1) incorporation of NUREG/CR-2913, "Two-Phase Jet Loads," and Branch Technical Position MEB 3-1 into the Oconee HELB licensing basis; (2) application of TORMIS and/or Draft Regulatory Guide DG-1143, Design-Basis Tornado and Tornado Missiles for Nuclear Power Plants, in reestablishing the Oconee tornado licensing basis; and (3) use of Fiber Reinforced Polymer (FRP) technology to strengthen selected masonry walls against the effects of tornado wind and differential pressure loads. As this will be the NRCs first time to review such application of the FRP technology, we will make every effort to support your request for a pre-submittal meeting in March 2006.
It is our understanding that you will be providing the NRC with a document listing the structures, systems, and components (SSCs) needed to mitigate tornado-and HELB-related events, as well as specifying which SSCs will be afforded physical protection from these events and which SSCs will rely on analyses to demonstrate adequate safety margin. During the February 7th meeting, you acknowledged the NRCs view that inherent to accrediting an SSC as part of the mitigation strategy for tornado-and/or HELB-related events, appropriate protection must also
B. Hamilton be afforded to the SSCs supporting equipment; this includes associated instrumentation, power supplies, and controls. Other key considerations that will have to be made regarding Oconees mitigation of HELB-related events is the necessity to account for jet impingement (throughout the auxiliary and turbine buildings) and the achievement of cold shutdown. Accordingly, to ensure the overall action plan/goal is understood by everyone involved, it is requested that you also provide the NRC with the intended mitigation strategies for tornado-and HELB-related events. Included in such a submittal should be key risk and/or event assumptions, the intent/concept behind the planned analyses (e.g., jet impingement, cold shutdown, TORMIS, etc.), and the major milestones toward timely resolution.
Should you have any questions regarding this letter, please contact me at (301) 415-3037.
Sincerely,
/RA/
Edwin M. Hackett, Deputy Director Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-269, 50-270, and 50-287 cc: See next page
B. Hamilton Oconee Nuclear Station, Units 1, 2, and 3 cc:
Ms. Lisa F. Vaughn Duke Energy Corporation 526 South Church Street P. O. Box 1006 Mail Code = EC07H Charlotte, North Carolina 28201-1006 Manager, LIS NUS Corporation 2650 McCormick Dr., 3rd Floor Clearwater, FL 34619-1035 Senior Resident Inspector U.S. Nuclear Regulatory Commission 7812B Rochester Highway Seneca, SC 29672 Mr. Henry Porter, Director Division of Radioactive Waste Management Bureau of Land and Waste Management Dept. of Health and Env. Control 2600 Bull St.
Columbia, SC 29201-1708 Mr. Michael A. Schoppman Framatome ANP 1911 North Ft. Myer Dr.
Suite 705 Rosslyn, VA 22209 Mr. B. G. Davenport Regulatory Compliance Manager Oconee Nuclear Site Duke Energy Corporation ON03RC 7800 Rochester Highway Seneca, SC 29672 Ms. Karen E. Long Assistant Attorney General NC Department of Justice P.O. Box 629 Raleigh, NC 27602 Mr. R. L. Gill, Jr.
Manager - Nuclear Regulatory Issues and Industry Affairs Duke Energy Corporation 526 S. Church St.
Mail Stop EC05P Charlotte, NC 28202 Division of Radiation Protection NC Dept of Environment, Health, & Natural Resources 3825 Barrett Dr.
Raleigh, NC 27609-7721 Mr. Peter R. Harden, IV VP-Customer Relations and Sales Westinghouse Electric Company 6000 Fairview Road 12th Floor Charlotte, NC 28210 Mr. Henry Barron Group Vice President, Nuclear Generation and Chief Nuclear Officer P.O. Box 1006-EC07H Charlotte, NC 28201-1006
ML060530500 NRR-106 OFFICE RII:DRP RII:DRP RII:DRP NRR/LPL2-NRR/LPL2-1/BC NAME RCarroll MErnstes JShea LOlshan EMarinos DATE 02/ 22 /06 02/ 22 /06 02/ 22 /06 02/ /06 02/ /06