ML20073C921
| ML20073C921 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 04/19/1991 |
| From: | Tremblay L VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML19302E524 | List: |
| References | |
| BVY-91-41, NUDOCS 9104260042 | |
| Download: ML20073C921 (2) | |
Text
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. VERMONT YANKEE NUCL, EAR POWER CORPORATION
- -ph Ferry Road. Brattleboro, VT 05301-7002 m,
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ENGINEERING OFFICE wp -
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DOL 10N MA 0170 (508s 77M711 April 19,1991 BVY 91 - 41 United States Nuclear Regulatory Commission Document Control Desk Washington, DC 20555
References:
(Listed on Page 3]
Subject:
Response to Third Request for Additional Infonnation on the Use of RELAP5YA
Dear Sir:
By Reference (o), USNRC approved the RELAP5YA program for use in best estimate Loss of Coolant Accident (LOCA) analyses. By Reference (p), Vermont Yankee provided supplementary information pertaining to our RELAP5YA LOCA analysis methodology for the purpose of justifying the use of the program in Evaluation Methodology analyses for Vermont Yankee, following the 10CFR 50 Appendix K approach.
The Vennont Yankee BWR LOCA licensing analysis method submitted on June 27,1986
[ Reference (n)] describes the method used to perfonn full break spectra cycle independent LOCA-ECCS licensing analyses in full compliance with applicable USNRC regulations contained in 10CFR 50.46 and 10CFR 50 Appendix K. This method uses the RELAP5YA code to model the Vermont Yankee plant and predict its thermal-hydraulic perfonnance. When approved, this methodology will be utilized in combination with the FROSSTEY-2 Fuel Perfonnance Code which is also presently under review at NRC to generate a new LOCA licensing analysis for Vermont Yankee.
References (q), (r), (s), and (t) constitute two sets of USNRC requests for additional information and subsequent responses by Vermont Yankee, in Reference (u), USNRC made a third request for additional information in order to complete review of the above described LOCA methodology, and requested a response within 30 days from letter receipt. Reference (u) was received by Vennoat Yankee on April 17,1991.
Enclosed please find Vermont Yankee's response to USNRC's third request for additional information per Reference (u). The enclosed information is considered proprietary and, in accordance with 10CFR2.790(b)(1), en affidavit attesting to the proprietary nature of the enclosure is attached.
WITHHOLD ENCLOSURE FROM PUBLIC DISCLOSURE wwww wlj P
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United States Nuclear Regulatory Commission April 19,1991 Page 2 We trust that the enclosed infomaation is responsive to your request and proves sufficient for you to com?lete your review of our RELAP5YA LOCA analysis methodology submittal.
Approval of this methodology, in combination with approval of the FROSSTEY-2 Fuel Performance Code currently under NRC review, will allow Vermont Yankee to perform an improved LOCA analysis. Should additional information be required, please contact this office.
Very truly yours, VERMONT Y ANKEE NUCLEAR POWER CORPOR ATION A
G Leonard A.Tremblay,Jr.
\\
Senior Licensing Engineer cc:
USNRC Region I Administrator (without Enclosure)
USNRC Resident Inspector - VYNPS (without Enclosure)
USNRC Project Manager - VYNPS (with Enclosure)
Mr. Lambrose Lois - USNRC (with Enclosure)
WITHHOLD ENCLOSURE FROM PUBLIC DISCLOSURE
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