ML20039B654

Advises of Revised Design Concept Which Calls for Installation of New Station Svc Transformers Equipped W/Automatic Tap Changing Secondary Capability.Installation Scheduled for Refueling Outage Beginning 820101

ML20039B654
Person / Time
Site:	Beaver Valley
Issue date:	12/15/1981
From:	Carey J DUQUESNE LIGHT CO.
To:	Varga S Office of Nuclear Reactor Regulation
References
TAC-13110, TAC-46213, NUDOCS 8112230348
Download: ML20039B654 (4)

Text

{{#Wiki_filter:- e ?Af 9:2H5s4000 - M",7?" December 15, 1981 t$219 Director of Nuclear Reactor Regulation gh g i United States Nuclear Regulatory Commission Attn: Mr. Steven A. Varga, Chief R fgC - c3 I Operating Reactors Branch No.1 [ $pg Division of Licensing p O$g0 j 8/gg Washfugton, DC 20555

Reference:

Beaver Valley Power Station, Unit. No.1 ( h% 77 Docket No. 50-334,. License No.-DPR-66 /p Emergency Bus. Transient Voltage Regulation Ny p l Centlemen: In our previous letters (reference letters dated January 18, February 22, June 17, and July 20, 1980) we had addressed the installation of 6.3 MVAR capacitor banks as the final resolution for transient voltage regulation on the 4160 volt 4 Emergency Buses. Since that time, procurement and installation problems ,1 associated with the capacitor banks have precluded the use of these components in this application, i This letter is to advise you of the revised design concept which has been issued and calls for the installation of new station service transformers equipped i' with at,tomatic tap changing secondary capability. Provisions will be provided for tap changer failure protection and remote control capability for the operator. I j Load flow tests have been conducted to determine the optimum primary tap setting for several system grid conditions (high r low voltage during normal and emergency conditions) to insure that secondar; voltage will be maintained at 4160V 10 % to the emergency bus switchgear and motors. The voltage analysis and test data which validated the original analysis 1 remain valid for this change in design concept. We believe that the use of tap changing transformers on the 4160 volt emergency buses will result in the desired f improvements in the performance of the system. ) We are forwarding as Attachment "A", the 4KV voltage profile for the range of fixed and variable tap settings presently recommended for the new station service transformers. 4 These transformers will be installed during this refueling outage which is presently scheduled to begin January 1, 1982. f ole Very tr ly yours, .1 M / / . J. Carey n Vice President, Nuclear O

r-l 4 4 Mr. Steven A. Varga, Chief December 15, 1981 BVPS/LC:KDG:125 ~Page 2 cc: M. D. A. Beckman, Resident Inspector U..S. Nuclear Regulatory Commission Beaver Valley Power Station Shippingport, PA 15077 U. S. Nuclear Regulatory Commission c/o Document Management Branch Washington, DC 20555 f i y.. 9

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