ML20070F017
| ML20070F017 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 02/28/1991 |
| From: | Pelletier J VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| BVY-91-21, NUDOCS 9103080001 | |
| Download: ML20070F017 (2) | |
Text
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i Y.
VERMONT YANKEE NUCLEAR POWER CORPORATION 1
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_ Ferry Road, Erattleboro, VT 0530b7002
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28, 1991 y,ce Preodent, Engineering
- 02) 257m ni ed States Nuclear Regulatory Commission
'ATTNt Document Control Desk Washington, DC 20555
References:
a.
License No. DPR-28 (Docket No. 50-271) b.
Letter, VYNPC to NRC,
" Response to Station Blackout, Rule 10 CFR 50.63" 3VY 89-36) dated April 12, 1989 Letter, ion Blackout,VYNPC to NRC, " Supplement to Response c
c.
to Stat Rule 10 CFR 50.63" (BVY 90-038) dated March 30, 1990
Subject:
Vermont Yankee Station Bhckout Plan -
Use of Vernon hydro station Dear Sir In our meeting at NRC headquarters on February 12[irmatlon a 1991 you requested Vermont Yankee to submit under oath and af letter detailing our understandings with-the Vernon hydro station regarding power supplied.from Vernon hydro to Vermont Yankee via the existing direct, dedicated tio line.
As we understand it, your concern in this matter conters around electrical supply and availability to Vermont Yankee from the Vernon hydro station.
The Vernon hydro station tie line provides an alternate AC power source i
in a Station Blacka c scenario.
The purpose of this Letter is to respond.to your request.
As discussed in our Station Blackout submittal References (b) and (c)), Vermont Yankee plans to utilire-the existi(ng tie line between Vermont Yankee and the nearby Vernon hydro station to satisfy Station Blackout Alternate AC power requirements.
The availability-and reliability of this power source has been proven over man years of Vernon hydro station operation.
Additionally, Vermont ankee plans to upgrade the tio line to provide further assurance that the line will not be damaged from external events.
Vermont Yankee recently confirmed by telecon with Vernon nydro station management that "to the best of (the hydro station operators') ability, (they) will keep the Vernon tie line energized at all times and that both the hydro station and NEPOOL consider this line a high priority line."
In addition, a contract is currently in place obligating Green Mountain Power /NEPCO to supply-
" emergency power" to Vermont Yankee from the Vernon hydro station.
Vermont Yankee has a mutual understanding, recently confirmed with Vernon hydro station management, ility of that Vermont Yankee will be notified of an anticipated unavailab the tie line that l
supplies Vermont Yankee from the Vernon hydro station.
It is a long-standing, customary practice for Vermont Yankee, the vernon i
hydro stution, and all other electrical suppliers on the grid to 9103080001 91022ti PDR ADOCK 03000271 PDR g gg P
?,
VERMONT YANKCC NUCLE AR POWER CORPOR ATloN i
notify individuals that may be affected prior to any planned switching, connection, or disconnection of electrical supply, and changes in the availability of the tio line with Vermont Yankee would be no exception.
In addition, the availability in the Vermont Yankee control room of voltage indication for the tic line and Vernon hydro station total power output indication provide i
information regarding the unavailability of voltage on the tie line and loss of the Vernon hydro station generator output for any reason.
At was discussed in our submittal of Reference (b), the tie line between the Vernon hydro station and Vermont Yankee is normally energized and the breaker to control connection of the tie line to emergency busses is under Vermont Yankee control.
Connection of Vernon hydro power to emergency busses can be made directly Irom the Vermont Yankee control room.
Vermont Yankee has indication in the control room which provides Vernon hydro tie line voltage and Vernon hydro tM.sl power output.
In addition, even in the rare instance where tie Vernon hydro power station output is zero, power can still be previded by the separate 69h', grid through the Vernon hydro tio line to Vermont Yankee.
The 69 kV transmission system emanating irom the Vernon hydro station is routed on rig'ats af way which are physically separate from the 115 ).V and 345 kV transmission lines which are the normal source of off-site power for Vermorit Yankee.
In addition, the 69 kV system is considere<l electrically independent from Vermont.
Yankee's 115 kV and 345 kV transmission system because no siegle line f ault or relay actution on the 115 kV or 34 5 kV system will cause loss of the 69 kV Uystem.
We believe that tha above-described mutual understanding between the Vernon hydro station and Vermont Yankee, combined wit.h the technical features of r.he tie line and the inherent rellebility of the Vernon hydro stintion, satisfactorily fulfills the alternate power requirements of 1 he station Blackout rule f or Vermont Yankee.
Should you have ta y further questions regarding this matter, please contact this e.,IfIce.
Very truly yours, l ?,nn l
James P. Pelletier Vice President, Engineering
$,.**-.%D. BCh' cc US!JRC Region I Administrator d
""% [6 US!1RC Resident Inspector - VYt1PS US!1RC Project Manager - VYllPS e
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$ FATE oF VERMONT I
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WINDHAM COUNTY
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sworn,0@ state'k[ lbe is Vice Then personally peared before me, James P. Pelletier, whe t no d President, Engineering of ermont Yankee Nuclear Power Corporation, ihat he is uly authorn, ed to es ute and f.le the toregoino document in the name and on the behalf of Vermont Yankee Nucleaf Power cQ(pt4Afqf and that the statements therein are true to the best of his 6nowledge and belief.
q',, '] t i. f LM Jan -
faenn
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ommissio er ebruary 10, 1995
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