ML19312C140

Supplies Info Addl to Util 740710,0808 & 28 Ltrs Re Unit 1 Component Cooling Sys.Addl Isolation Valves Installed Between Component Cooling Drain Tank Pump Discharge Header & Miscellaneous Waste Transfer Pump Discharge Header

ML19312C140
Person / Time
Site:	Oconee
Issue date:	05/09/1975
From:	Thies A DUKE POWER CO.
To:	Moseley N NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
NUDOCS 7912060698
Download: ML19312C140 (2)

Text

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e-I Letter to N. C. Moseley from Duke Power Company dated May 9,1975 i

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H. D. Thornburg, IE l

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Office of Standards Development

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A. c. TH Es P. O.Dox as7s seNeon vice passicaNr PRO DUC T ION AND TRANSN.SSioN May 9, 1975 Mr. Norman C. Moseley, Director U. S. Nuclear Regulatory Commission Suite 818 230 Peachtree Street, Northwest Atlanta, Georgia 30303 g

Dear Mr. Moseley:

4 This letter is to supplement my letters dated July 10, August 8, and August 28, 1974 concerning activity in the Component Cooling System at the Oconee Nuclear Station, Unit 1.

A modification has been per-formed which installed additional isolation valves between the component cooling drain tank pump discharge header and the miscellaneous waste transfer pump discharge header. The level of activity in the Component Cooling System has decreased since the additional isolation valves have been installed.

Thus, it is concluded that the original source of activity in the Component Cooling System was through this connection from the Component Cooling System to the liquid waste disposal header. Monitoring of Component Cooling System activity will continue until the activity level decays to normal background.

Very truly yours, A. C. Thies i

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