ML20206S455
| ML20206S455 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 06/27/1986 |
| From: | Carey J DUQUESNE LIGHT CO. |
| To: | Harold Denton, Tam P Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-2.K.3.31, TASK-TM 2NRC-6-069, 2NRC-6-69, FL-83-35, GL-83-35, TAC-62930, NUDOCS 8607070356 | |
| Download: ML20206S455 (2) | |
Text
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'Af Duquesne Lidit 2NRC-6-069 Beaver valley No. 2 Unit Project Organization SEG Bu11 din 9 (412) 643-5200 P.O. Box 328 Telecopy(412)6435200 Shippingport, PA 15077 Est. 160 June 27, 1986 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Washington, DC 20555 ATTENTION:
Mr. Peter Tam, Project Manager Division of PWR Licensing - A Of fice of Nuclear Reac tor Regulation
SUBJECT:
Beaver Valley Power Station - Unit No. 2 Docket No. 50-412 Confirmatory Item 41(e), II.K.3.31
References:
a) NRC Generic Letter 83-35 from D.
G. Eisenhut,
" Clarification of IMI Action Plant Item II.K. 3. 31", Novembe r 2, 1983 b)
L.D.
Butterfield letter to J. Lyons,
" Westinghouse Owners Group Transmittal of WCAP-11145", OG-190, June 11, 1986 Gentlemen:
NUREG-0737, Item II.K.3.31 requires a plant specific analysis utilizing the new NRC approved NOTRUMP Small Break LOCA (SBLOCA) Evaluation Model (EM).
In Reference (a), the NRC Staff indicated that the resolution of IMI 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 c onserva tive when compared with the new NOTRUMP SBLOCA EM.
Such generic studies were undertaken by the Westinghouse Owners Group (WOG) of wh ich Duquesne Light Company is a par tic ipa t ing member.
The WOG has completed these generic studies and has submit ted the results of the analyses to the NRC in the topical report WCAP-11145 (Reference b). The purpose of this is to inform you that Duquesne Light Company is referencing topical report WCAP-11145 in order to satisfy the requirements of IMI Action Item II.K.3.31 for Beaver Valley Unit No. 2 in a generic fashion, in accordance with Reference a.
M h
N D
((B
y 1
United States Nuclear Regulatory Commission Mr. Harold R. Denton Confirmatory Item 41(e), II.K.3.31 Page 2 Topical Report WCAP-lll45 documents the results of a series of Small Break LOCA (SBLOCA) analyses performed with the NRC approved NOTRUMP SBLOCA Evaluation Mode.
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 l
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 i
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 conserva tive for all pl ant categories.
In particular, the 3-loop plant category results showed that the NOTRUMP SBLOCA EM calculated a limiting Peak Clad Temperature (PCT) which was 586*F lower than previously calculated by the WFLASH SBLOCA EM.
The generic results documented in WCAP-lll45, demonstrate that a plant specific reanalysis of the 3-loop Beaver Valley Unit No. 2 plant with the NOTRUMP SBLOCA EM would result in the calculation of a limiting PCT i
which would be significantly lower than the 1985*F PCT currently calculated with the WFLASH SBLOCA EM.
Hence, the WFLASH SBLOCA EM results which currently form the licensing basis for Beaver Valley Un i t ' No. 2 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 10CFR50.46.
It is there fore concluded that a plant specific analysis is not needed in order for Beaver Valley Unit No. 2 to comply with TMI Action Item II.K.3.31.
Rather, Duquesne Light Company re ferences WCAP-lll45 in order to comply with the IMI Action Item II.K.3.31 on a generic basis, in accordance with Reference a.
This should satisfy confirmatory Item No.
41(e) from the Beaver Valley Unit No.
2 Sa fe ty Evaluation Report.
DUQUESNE LIGHT COMPANY By J. J. Carey Vice President j
RWF/ijr l
NR/ITDi/41 cc:
Mr. P. Tam, NRC Project Manager Mr. L. Prividy, NRC Resident Inspector
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