ML20206T149
| ML20206T149 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 07/03/1986 |
| From: | Nauman D SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | Rubenstein L Office of Nuclear Reactor Regulation |
| References | |
| TASK-2.K.3.31, TASK-TM GL-83-35, NUDOCS 8607080030 | |
| Download: ML20206T149 (2) | |
Text
.
i, South Carolina Electric & Gas Company Dan A. Nmman Co umb 29218 N cle perations SCE&G July 3,1986 Mr. Lester S. Rubenstein, Director PWR Project Directorate # 2 Division of PWR Licensing - A Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington,DC 20555
Subject:
Virgil C. Summer Nuclear Station Docket No. 50/395 Operating License No. NPF-12 NOTRUMP Small Break LOCA i
(SBLOCA) Evaluation Model Submittal
Reference:
1.
Thomas M. Novak letter to O. W. Dixon, " Virgil C. Summer Nuclear Station Facility Operating License", June 10,1985.
j 2.
NRC Generic Letter 83-35 from D. G. Eisenhut, " Clarification of TMl Action Plant item II.K.3.31", November 2,1983 3.
L. D. Butterfield letter to J. Lyons, " Westinghouse Owners Group Transmitta! of WCAP-11145, WOG-190, June 11,1986
Dear Mr. Rubenstein:
)
i i
l In accordance with Reference (1), a plant specific analysis utilizing the new NRC a proved NOTRUMP Small Break LOCA (SBLOCA) Evaluation Model (EM) is required to satis TMI Action Plan item II.K.3.31. In Reference (2), the NRC Staff indicated that the resolu ion of i
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. Such generic studies were planned by the Westinghouse Owners Group (WOG) of which South Carolina Electric and Gas (SCE&G) is a participatinc member. The WOG has completed these generic studies and has submitted the results o"the analyses to the NRC in the topical report WCAP-11145 (Reference (3)).
The purpose of this letter is to inform you that SCE&G is referencing to sical report WCAP-11145 in order to satisfy the requirements of TMI Action item II.K.3.31 For Virgil C. Summer Nuclear Station (VCSNS) in a generic fashion, in accordance with Reference (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 EM. 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 3-loop plant category results showed that the NOTRUMP SBLOCA EM calculated a limiting Peak Clad Temperature (PCT)
I which was 586 *F lower than that previously calculated by the WFLASH SBLOCA EM.
l? 2888 8Wo$\\P=
?
1 f
Mr. Lester Rubenstein Page Two July 3,1986 The generic results documented in WCAP-11145, demonstrate that a plant specific reanalysis of the 3-loop VCSNS with the NOTRUMP SBLOCA EM would result in the i
calculation of a limiting PCTwhich would be significantly lower than the 1822 F PCT currently calculated with the WFLASH SBLOCA EM. Hence,the WFLASH SBLOCA EM results which currently form the licensing basis for VCSNS are conservative and still valid for demonstrating the adequacy of the Emergency Core Cooling System to mitic ate the consequences of a SBLOCA, as required by 10CFRSO.46. It is therefore i
conc uoM that a plant specific analysis is not needed in order for VCSNS to comply with TMI Action item II.K.3.31. Rather, SCE&G references WCAP-11145 in order to comply with TMI Action Item II.K.3.31 on a generic basis,in accordance with Reference 2. This should satisfy the license condition 2.C. (23)e of VCSNS Operating License NPF-12.
If there are any questions, please contact Mr. L. R. Cartin of my staff directly at 804-748-3106.
t, ! yours, 1 % Okh i
D.
aymaY
]
DBM: DAN:tdh I
c:
V. C. Su mmer O. W. Dixon, J r./T. C. Nichols, Jr.
E. H. Crews, Jr.
E. C. Roberts l
J. G. Con nelly, Jr.
l W. A. Williams, Jr.
J. Nelson Grace Group Managers O. S. Bradham l
C. A. Price C. L. Ligon (NSRC)
R. M. Campbell K. E. Nodland R. A. Stough G. O. Percival R. L. Prevatte J. B. Knotts, jr H. G. Shealy NPCF File y -.
.-.e y-,
,#.-w.w-
,,,wm
-,~
.,,,4----.v~,.,c-
,,,.3-w.
. - -.,, -,-e,,-,-
.,-,.r..--
., -,.