ML20063L353
| ML20063L353 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 09/07/1982 |
| From: | Sinclair J VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | Vassallo D Office of Nuclear Reactor Regulation |
| References | |
| FVY-82-98, NUDOCS 8209090066 | |
| Download: ML20063L353 (2) | |
Text
VEitMONT YANKEE NUCLEAR POWER COItPORATION 2.C.2.1 RD 5, Box 169. Ferry Road Brattleboro, VT 05301 FVY 82-98 p'
ENGINEERING OFFICE j-1671 WOAraSTER ROA D FnAMINGHAM. MASe ACHUSETTS 01701 T E L E PHONE 617 8472-8100 l
September 7,1982 United States Nuclear Regulatory Comailssion Wa shington, D. C. 20555 Attention:
Office of Nuclear Reactor Regulation Mr. Domenic B. Vassallo, Chie f Operating Reactors Branch No. 2 Division of Licensing Re f e re nce s:
(a) License No. DPR-28 (Docket No. 50-271)
(b) Letter, USNRC to All Power Reactors, dated August 8, 1979 t
(c) Letter, VYNPC to USNRC, WVY 80-44, dated March 17, 1980 Subjec t :
Adequacy of Station Electric Distribution System Voltage
Dear Sir:
The purpose of this letter is to provide additional inforutation and clarification as requested in a phone conversation held on August 31, 1982 between R. Prevatte of the NRC and P. R. Johnson of YAEC.
1.
Q estion: What are the new tap settings referred to in Reference (c)?
Response: The new tap settings are:
Transformers 3A and 3B - 115 kV tap Transformers 8 and 9 - 4056 volt tap.
These tap settings were provided in YAEC Report #1205,
" Auxiliary Power System Voltage Study for Vermont Yankee Nuclear Power Station".
2.
Qiestion: Are the taps changed perodically when the plant changes f rom the closed cycle cooling mode to the open cycle cooling mode?
OII 8209090066 820907 PDR ADOCK 05000271 l
P PDR l
l
VisiblONT YANKlif t NUCLIIAlt POwl?It COliTOlt ATION United States Nuclear Regulatory Commission September 7, 1902 Ae te nt io n:
Mr. Domenic B.
Vassallo Page 2 Responce: No.
Reference (3) may have been misleading on this point.
In 1980, Vermont Yankee was required to complete the tap changes before operation in the closed cycle cooling mode, but the tap changes were permanent.
Cases 4A, 48, 4C, and 4D of YAEC Report //1205 demonstrate that adequate voltage exists at safety loads with the new tap settings.
We trust that this inf ormation is satisf actory; however, should you have any questions, please do not hesitate to contact us.
Very truly yours, VERMONT YANKEE NUCLEAR POWER CORPORATION y.'s. L.aus J. B. Sinclair Licensing Engineer JBS:dd