ML19241A735

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Responds to 790502 Ltr Re Station Electrical Distribution Sys Voltages.Mods & Analyses in Progress to Verify Capability of Electrical Power Sys.Results Will Be Forwarded by 790731
ML19241A735
Person / Time
Site: North Anna Dominion icon.png
Issue date: 07/05/1979
From: Stallings C
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To: Harold Denton, Vassallo D
Office of Nuclear Reactor Regulation
References
352-050279, 352-50279, NUDOCS 7907090338
Download: ML19241A735 (1)


Text

VruorsrA l: t.1:cT u r c As n l'ow e. u Co st iw N Y Iticinxoxn vinoixia unuoi July 5, 1979 Mr. Harold R. Denton, Director Serial No: 352/050279 Of fice of Nuclear Practor Regulation P0/DLB:baw Attn: Mr. D. B. Vassallo, Assistant Director Docket No.50-33d for Light Water Reactors License No. NPF-4 Division of Project Manar,ement U. S. Nuclear Regulatory Co:nrtissi a Wishington, D. C. 20555 Dear Mr. Denton This is in response to your lettc.r of May 2, 1979 in reference to station electrical distribution system voltages on North Anna Unit 1. ,

As explaired in e.evious correspondence, several rnodifications to the elec-trical di tribuuon system are either in progress or planned at North Anna.

Modificat'ons to cuand the capabilitir.s of the offsf * . power sources are cu rren t 1:. in progress on Unit 2. New protective relays or degraded voltage protection are to be installed on Unit 1 during the first refueling outage which is scheduled +o b. gin on or about September 15, 1979.

Analyses are currently in proo,ress to verify the capability and capacity of the el.ectric power syt mm to start and operate the required safety loads within their rated citages. These analyses are based on the electrical system destga ac it will be following the above listed modifications. Results of these analyses will be forwarded on or about July 31, 1979.

We intend to perform tests to demonstrate the validity of analyses results.

Since these tests will be based in part on the results of the analyses, specific test procedures have not been finalized at this time. A descrip-tion of.the test program will be forwardei on or about August 15, 1979.

Very truly yours,

b. ), %hthny C. M. Stallings Vice President-Power Supply and Production Operations cc: Mr. James P. O'Reilly 309 166 7007090338