ML20206M195
| ML20206M195 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 06/23/1986 |
| From: | Bailey J GEORGIA POWER CO. |
| To: | Youngblood B Office of Nuclear Reactor Regulation |
| References | |
| TASK-2.K.3.31, TASK-TM 0554V, 554V, GN-959, NUDOCS 8607010085 | |
| Download: ML20206M195 (2) | |
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Georg:a Power Company Route 2, Box 299A Waynesboro, Georgia 30830 Telephone 404 554-9961 404 724 8114 Southern Company Seruces, Inc Post Offlce Box 2625 B,rmegham. Alabama 35202 Telephone 205 870 6011 Vogtle Proj.ect June 23, 1986 Director of Nuclear Reactor Regulation File:
X7BC35 Attention:
Mr. B. J. Youngblood Log:
GN-959 PWR Project Directorate #4 Division of PWR Licensing A U. S. Nuclear Regulatory Commission Washington, D.C.
20555 REF:
(1) NRC GENERIC LETTER 83-35 FROM EISENHUT, " CLARIFICATION OF TMI ITEM II.K.3.31," 11/2/83 (2) BAILEY TO DENTON, GN-666, 7/25/85 (3)
L. D. BUTTERFIELD TO J. LYONS, " WESTINGHOUSE OWNERS GROUP TRANSMITTAL OF WCAP-11145," OG-190, 6/11/86 NRC DOCKET NUMBERS 50-424 AND 50-425 CONSTRUCTION PERMIT NUMBERS CPPR-108 AND CPPR-109 V0GTLE ELECTRIC GENERATING PLANI - UNITS 1 AND 2 SER CONFIRMATORY ITEM 41: TMI ITEM II.K.3.31
Dear Mr. Denton:
The subject SER item requires GPC to submit a plant specific analysis utilizing the new NRC approved NOTRUMP Small Break LOCA (SBLOCA) Evaluation Model (EM), as required by THI Action Plan Item II.K.3.31.
In Reference (1),
the NRC staf f indicated that the resolution of TMI Action Plan Item II.K.3.31 may be accomplished by generic analyses to demonstrate that the previous NRC approved WFLASH SBLOCA EM results were conservative when compared with the new NOTRUMP SBLOCA EM.
In Reference (2) GPC stated its intent to reference the generic analysis. Such generic studies were undertaken by the Hestinghouse Owners Group (WOG) of which GPC is a participating member. The WOG has completed these generic studies and has submitted the results of the analyses to the NRC in the topical report WCAP-11145 (Reference 3).
The purpose of this letter is to inform you that GPC is referencing topical report WCAP-11145 in order to satisfy the requirements of TMI Action Item II.K.3.31 for the VEGP in a generic fashion, in accordance with Reference 2.
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Director of Nuclear Reactor Regulation Files X7BC35 June 23, 1986 Log:
GN-959 Page 2 Topical report WCAP-11145 documents the results of a series of Small Break LOCA (SBLOCA) analyses performed with the NRC approved NOTRUMP SBLOCA Evaluation Model. Cold leg break spectrum analyses were performed for the limiting SBLOCA plant from each of the Westinghouse 4-loop, 4-loop Upper Head Injection (UHI), 3-loop, and 2-loop plant categories. The limiting SBLOCA plant in each category was defined on the basis of previous SBLOCA analyses which were performed with the NRC approved WFLASH SBLOCA FM.
In addition to the cold leg break spectrums, a hot leg and pump suction break were performed as part of the 4-loop plant analyses, confirming that the cold leg was still the worst break location. Comparison of the NOTRUMP cold leg break spectrum results with the previously generated WFLASH results, showed that the WFLASH results were conservative for all plant categories. In particular, the 4-loop plant category results showed that the NOTRUMP SBLOCA EM calculated a limiting Peak Clad Temperature (PCT) which was 573 F lower than that previously calculated by the WFLASH SBLOCA EM.
The generic results documented in WCAP-11145, demonstrate that a plant specific reanalysis of the 4-loop VEGP with the NOTRUMP SBLOCA EM would result in the calculation of a limiting PCT which would be significantly lower than the 15370F PCT currently calculated with the WFLASH SBLOCA EM.
Hence, the WFLASH SBLOCA EM results which currently form the licensing basis for the VEGP are conservative and still valid for demonstrating the adequacy of the Emergency Core Cooling System to mitigate the consequences of a SBLOCA, as required by 10 CFR 50.46.
It is therefore concluded that a plant specific analysis is not needed in order for the VEGP to comply with TMI Action Item II.K.3.31.
Rather, CPC references WCAP-11145 in order to comply with TMI Action Item II.K.3.31 on a generic basis, in accordance with References 1 and 2.
This should satisfy requirements for resolution of the VEGP SER Confirmatory Item 41.
If your staff requires any additional information, please do not hesitate to contact me.
Since rely, 6
J. A. Bailey Project Licensing Manager JAB /sm Attachment xc:
R. E. Conway NRC Regional Administrator 1
R. A. Thomas NRC Resident Inspector J. E. Joine r, Esquire D. C. Teper B. W. Churchill, Enquire W. C. Ramsey M. A. Miller (2)
L. T. Cucwa B. Jones, Esquire C. W. Hayes G. Dockhold, Jr.
Vogtle Project File 0554V
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