ML20206P287
| ML20206P287 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 06/27/1986 |
| From: | Hunter D VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | Muller D Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20206P291 | List: |
| References | |
| FVY-86-61, NUDOCS 8607020082 | |
| Download: ML20206P287 (2) | |
Text
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4 VERMONT YANKEE NUCLEAR POWER CORPORATION RD 5 Box 169, Ferry Road, Brattleboro, VT 05301 REPLY TO:
y ENGINEERING OFFICE 1671 WORCESTER ROAD FRAMINGHAM, MASSACHUSETTS 01701 TELEPHONE 617-872-8100 June 27, 1986 FVY 86-61 United States Nuclear Regulatory Commission Washington, DC 20555 Attention:
Office of Nuclear Reactor Regulation Mr. Daniel R. Muller, Director l
BWR Project Directorate No. 2 Division of BWR Licensing
References:
(a) License No. DPR-28 (Docket No. 50-271)
(b) Letter, YAEC to NRC, FVY 83-4, dated January 14, 1983 (c) Letter, USNRC to MYAPCO, NMY 84-91, dated May 11, 1984 (d) Letter, USNRC to YAEC, dated January 3, 1985 (e) Letter, MYAPC0 to USNRC, dated January 31, 1985 (f) Letter, YAEC to USNRC, FVY 85-18, dated March 1, 1985 (g) Letter, USNRC to VYNPC, NVY 85-48, dated March 14, 1985 (h) Letter, YAEC to USNRC, FYR 85-48, dated April 30, 1985 (i) Letter, YAEC to USNRC, FYR 85-72, dated July 1,1985 (j) Letter, YAEC to USNRC, FYR 85-87, dated August 15, 1985 (k) Letter, VYNPC to USNRC, FVY 85-98, dated October 22, 1985 (1) Letter, YAEC to USNRC, FYR 85-121, dated November 1,1985 (m) Letter, VYNPC to USNRC, FVY 85-122, dated December 31, 1985
Subject:
Vermont Yankee BWR Loss-of-Coolant Accident Licensing Analysis Method
Dear Sir:
Dy letter, dated January 14,1983 [ Reference (b)], Yankee Atomic Electric Company (YAEC) submitted RELAP5YA, a Computer Program for Light Water Reactor System Thermal-Hydraulic Analysis, to the NRC for review and licensing approval.
In accordance with the schedule established during the February 14, 1985 Vermont Yankee LOCA Analysis Method Licensing meeting, [ Reference (g)],
Vermont Yankee herein submits the attached report, " Vermont Yankee BWR Loss-of-Coolant Licensing Analysis Method."
8607020002 860627 DR ADOCK 0000 1
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United States Nuclear Regulatory Commission June 27, 1986 Attention:
Mr. Daniel R. Muller, Director Page 2 FVY 86-61 This report describes the BWR Loss-of-Coolant Accident (LOCA) licensing analysis method for the Vermont Yankee Nuclear Power Station. This LOCA method will be used to perform full break spectra (size and location) cycle independent LOCA-ECCS licensing analyses in full compliance with applicable USNRC regulations contained in 10CFR50.46 and Appendix K.
The referenced report also provides licensing analysis results for both large and small recirculation loop breaks (Sample Problems 1 and 2).
The method basically uses the RELAPSYA LWR System Thermal-Hydraulic Analysis Computer Program developed and extensively assessed by YAEC. The code assessment work has established the validity of the code to predict the complex thermal-hydraulic phenomena encountered in LWR LOCA events.
In particular, the code assessment has shown that use of the evaluation model features in RELAPSYA required by Appendix K yields reliable, conservative predictions when compared to experimental results such as from TLTA and Marviken tests.
Therefore reliable, conservative predictions are obtained for l
the Vermont Yankee LOCA licensing analyses since these same features plus additional conservative assumptions are used.
f As stated in Vermont Yenkee's (VY) letter of October 22, 1985
[ Reference (k)], the development and licensing of the RELAP5YA LOCA code is one of high importance and one in which NRC's review schedule has direct impact upon the planned application of this method for VY's Cycle 14 high energy bund's reload. Therefore, we request an early meeting with NRC technical s.ff to present the attached report and discuss the status and schedule of NRC's licensing review of Vermont Yankee's LOCA analysis method.
We propose that the meeting be held on July 17, 1986, and we will contact Mr. Vern Rooney, NRC Project Manager for Vermont Yankee, to confinn a date.
We trust the attached report is satisfactory; however, should you have additional questions or require further information, please contact us.
Very truly yours, VERMONT YANKEE NUCLEAR POWER C3RPORATION 6
Donald Hunter Vice President DH/jlc Attachment l
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