ML19210E392

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Interim Deficiency Rept on Safeguards Area Exhaust Sys. Evaluation Revealed Only Safeguards & Central Area Exhaust Sys Must Be Operational After Seismic Event.Final Rept Forthcoming
ML19210E392
Person / Time
Site: North Anna Dominion icon.png
Issue date: 11/30/1979
From: Brown S
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
References
NUDOCS 7912040487
Download: ML19210E392 (1)


Text

D"*D TYg' ce o s A k/ft, p VIRGINI A ELECTRIC AND POWER COMP AN ,a aMON D, VIRGINI A 23061 flovember 30, 1979 Mr. James P. O'Reilly, Directer Serial No. 907A Office of Inspection & Enforcement PSE&C/SCJ:mac:w na

11. S. Nuclear Peculatory Commission Region II Docket No. 50 ~439 101 Marietta Street, Suite 3100 Atlanta, Georgia 3030?

Dear Mr. O'Reilly:

On October 31, 1979 a report was made under the provisions of 10CFR50.55(c) concerning the Safeguards Aree Exhaust System, North Anna Powar Station,finit 2.

We have reviewed this concern and offer the following additional informtion:

The Safeguards Araa Exhaust System discharges into a ventilation exhaust header on top of the auxiliary builcing. In addition to the Safeguards Area Exhaust System, three other systems (Fuel Buildina Exhaust, Decontamination Ruilding Exhaust, & Containment Purge Exhaust) discharge into the same comon header to a vent stack. Tha auxiliary building Central and General Ares Exhaust Systems disch>rga through a second common hader and vent stack. The vent stacks and portions of the exhaust ductwork are not saismically qualifind.

Evaluation of all six systens indicate that only the Safeguards and Central Area Exhaust Systems must he onerational after a seismic event.

We are continuinq our review to determine if modifications are required to ensure that the Safeguards and Central Area Exhaust Svstams will perform thnir intended functions.

We consider this letter an interim report; a'1y information not available at this time will he submitted in a final report. Should you require further information, please centact this office.

?

~vgdly pr , j

/ /V C. Brown, Jr.

. h&& I Senior Vice President - Power +1 tion Engine ring and Construc ,

g ec: Mr. Victor Stello, Director 0 Offi e of Inspection & Enforcement Mr. Ifarold R. Denton, Director Office of rinclear Reactor Regulation 1475 i89 7912040 & 4