ML18136A043

Forwards Proposed Startup Test Procedure 1-ST-9,Revision 0, Voltage Profile, in Response to 790808 Request.Also Submits Info Re Adequacy of Electric Distribution on Sys Voltages in Event of Loss of Both Offsite Sources

ML18136A043
Person / Time
Site:	Surry, North Anna
Issue date:	10/09/1979
From:	Stallings C VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	Harold Denton, Gammill W Office of Nuclear Reactor Regulation
Shared Package
ML18136A044	List: ML18136A043 ML18136A045
References
673-080879, 673-80879, NUDOCS 7910120168
Download: ML18136A043 (2)

Text

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a, VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND,VIRGINIA 23261 October 9, 1979 Mr. Harold R. Denton, Director Serial No. 673/080879 Office of Nuclear Reactor Regulation PO/FHT

baw Attn: Mr. William Gammill, Acting Assistant Docket Nos. 50-280 Director for Operating Reactor Projects 50-281 Division of Operator Reactors 50-338 U. S. Nuclear Regulatory Commission 50-339 Washington, D. C. 20555 License Nos. DPR-32 DPR-37 NPF-4 CPPR-78

Subject:

North Anna Power Station Units 1 and 2 Surry Power Station Units 1 and 2 Adequacy of Station Electric Distribution System Voltages

Dear Mr. Denton:

Your letter of August 8, 1979, on the above subject requested licensees to review their station electric distribution systems to determine analytically that they are of sufficient capacity and capability to automatically start as well as operate all required safety loads. Our letter, Serial No. 352A, dated August 16, 1979, provided the results of our analysis for North Anna Unit 1 in response to Mr. D. B. Vasallo's letter of May 2, 1979. Our letter, Serial No. 403A, dated August 7, 1979, provides similar analysis results for North Anna Unit 2.

You have also requested that the analysis of the onsite distribution of power from the offsite source be verified by test. Please find attached a copy of the proposed test program for North Anna which is scheduled for imple-mentation after North Anna Unit 2 becomes operational. Test results will be forwarded as soon as they become available.

In accordance with your instructions, we have examined the North Anna electric power systems to determine if there are any conditions that could result in the simultaneous loss of both offsite sources. We have determined that our system complies with GDC17 with respect to redun-dancy with the possible exception of two areas which require more in-depth analysis. These areas involve 1) a 34.5KV tie breaker and auto-matic transfer scheme between the two 34.5KV buses in the switchyard and 2) the switchyard service transformers which are fed' from the two 34.5KV buses. The results of our further analysis in these two areas will be completed and. forwarded to you within 45 days of the date of this letter.

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e e VIRGINIA ELECTRIC AND POWER COMPANY TO Mr. Harold R. Denton 2 Our analysis of the Surry Power Station electric distribution systems is well underway. We expect to receive the results of the voltage profile analysis in early November, 1979. We will forward the results of the analysis and the results of our GDC 17 review for Surry Power Station as they become available.

If you have any questions or require additional information, please contact this office.

Very truly yours,

~.7)7. ~t£n1a,/

C. M. Stallings Vice President-Power Supply and Production Operations cc: Mr. James P. O'Reilly, Director Office of Inspection and Enforcement Region II