ML20215G957
| ML20215G957 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 10/02/1986 |
| From: | Sieber J DUQUESNE LIGHT CO. |
| To: | Tam P Office of Nuclear Reactor Regulation |
| References | |
| TASK-2.K.3.31, TASK-TM TAC-48146, NUDOCS 8610210188 | |
| Download: ML20215G957 (2) | |
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Telephone (412) 393-6000 Io'.'*e*lx l ""
Shippingport. PA 15077-0004 October 2, 1986 Director of Nuclear Reactor Regulation
/ U. S. Nuclear Regulatory Commission Attn:
Mr. Peter S. Tam, Project Manager Project Directorate No. 2 Division of PWR Licensing - A Washington, DC 20555
- Mail Stop 340 -
Reference:
Beaver Valley Power Station, Unit No. 1 Docket No. 50-334, License No. DPR-66 Rerponse to TMI Action Item II.K.3.31 1.
NRC Generic Letter 83-35 from D..G. Eisenhut,
" Clarification of TMI Action Plan Item II.K.3.31", November 2, 1983 2.
L. D. Butterfield letter to J. Lyons,
" Westinghouse Owners' Group Transmittal of WCAP-11145, OG-190", June 11, 1986 Gentlemen:
In Reference (1), the NRC Staff 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 Small Break Loss-of-Coolant (SBLOCA) Evaluation Model (EM) results were conservative when compared with the new NOTRUMP SBLOCA EM. Such generic studies were undertaken by the Westinghouse Owners Group (WOG) of which Duquesne Light Company 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 2).
The purpose of this letter is to inform you that Duquesne Light Company is referencing topical report WCAP-11145 in order to satisfy the requirements of TMI Action Item II.K.3.31 for Beaver Valley Power Station, Unit 1 in a generic fashion, in accordance with Reference 1.
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 J'
8610210188 861002 PDR ADOCK 05000334 g' g p
Beaver Valley Power Station, Unit No. 1 o
Docket No. 50-334, License No. DPR-66 Response to TMI Action Item II.K.3.31 Rege 2 arvaly se s, 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) whfch was 586 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 3-loop Beaver Valley Power Station, Unit 1 plant with the NOTRUMP SBLOCA EM would result in the calculation of a limiting PCT which would be significantly lower than the 1729 F PCT currently calculated with the WFLASH SBLOCA EM.
Hence, the WFLASH SBLOCA EM results which currently form the lice'nsing basis for Beaver Valley Power Station, Unit 1 are conservative and still valid for demonstrating the adequacy of the Emergency Core Cooling System to mitigate the cor. sequences of a SBLOCA, as required by 10CFR50.46.
It is therefore concluded that a plant specific analysis is not needed in order for Beaver Valley Power Stati6n, Unit 1 to comply with TMI Action Item II.K.3.31.
Rather, Duquesne Light Company references WCAP-11145 in order to comply with TMI Action Item II.K.3.31 on a generic basis, in accordance with Reference 1.
If there are any questions about this submittal, please contact either myself or members of my staff.
Very truly yours,.
A
/
/J. D. Sieber
/ Vice President Nuclear Operations cc:
W. M. Troskoski, Resident Inspector U. S. Nuclear Regulatory Commission i
Beaver Valley Power Station Shippingport, PA 15077 U. S. Nuclear Regulatory Commission c/o Document Management Branch Washington, DC 20555 Director, Safety Evaluation & Control Virginia Electric & Power Company P. O. Box 26666 One James River Plaza Richmond, VA 23261 b
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