LAilDtJ FILiE'RS Al on: om oe VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND,, VIRGINIA 23261 R.H.LEA.SBURO VxcE PRESIDENT NUCLEAR 0PE11ATXONS August 5, 1982 Mr. Harold R. Denton, Director

e VIRGINIA ELECTRIC AND POWER COMPANY

RICHMOND,, VIRGINIA 23261

R.H.LEA.SBURO VxcE PRESIDENT

NUCLEAR 0PE11ATXONS

August 5, 1982

Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation Attn: Mr. Steven A. Varga, Chief

Operating Reactors Branch No. 1 Division of Licensing

U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Gentlemen:

Serial No. 472 NO, PSEC/JOE, EVF/jmj/SP4 Docket Nos. 50-280

50-281 License Nos. DPR-32

DPR-37

AUXILIARY VENTILATION SYSTEM MODIFICATION SURRY POWER STATION - UNITS 1 AND 2

In our letter of June 7, 1982 (Serial Number 335), it was indicated (Paragraph 3.a) that we would provide justification for our position of utilizing 80 percent relative humidity in the laboratory testing of used charcoal samples from the Auxiliary Ventilation System. Enclosed is a copy of calculations prepared by our Architect-Engineer indicating that even under worst case postulated conditions, the relative humidity entering the Category I filter train would not exceed 76.25 percent. We feel this provides justification of utilizing 80 percent in the acceptance testing of used charcoal.

Should you require additional information, please contact us.

Enclosure

cc: Mr. James P. O'Reilly, Regional Administrator Office of Inspection and Enforcement Region II Atlanta, Georgia 30303

Mr. Richard C. DeYoung, Director Office of Inspection and Enforcement Washington, D.C. 20555

--- 8208100110 - 820805 PDR ADOCK 05000280 P PDR

Very truly yours,

,~\__~ -1.i:, R. H. Leasburg

Aool

l ' -NE&. WEBS.TE~ ENGINEERING CORP~ION

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