ML20004E577
| ML20004E577 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 06/10/1981 |
| From: | Sylvia B VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Clark R, Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| 340, NUDOCS 8106120357 | |
| Download: ML20004E577 (2) | |
Text
m VsmorwxA Er.ECTRIC AND POWEN COMPANY Racumons VrmorwzA 20261 June 10,1981 Mr. Harold R. Denton, Director Serial No. 340 Office of Nuclear T tor Regulation N0/AS:smv Attention:
Mr. Roo. t A. Clark, Chief Docket No. 50-338 Operating Reactors Branch No. 3 License No. NPF-4 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Centlemen:
CONDENSATE POLISHING SYSTEM NORTH ANNA POWER STATION Vepco letter, Serial No.1033, dated December 10, 1979 with attachment reported the results of the first inservice steam generator inspection performed at North Anna Unit 1.
Section V of the attachment entitled " Corrective Action",
paragraph "A" entitled " Condensate Polishers" indicated that "the Powdex units will be operated as filters or in the bypass mode until an evaluation of modifications to prevent additional resin discharges can be completed".
i The condensate polishing system (Powdex) has been in the bypass mode since the completion of the first steam generator inservice inspection. An engineering evaluation was made to determine the extent of system modifications.
Design Change No.80-69A for North Anna Unit No. I was prepared and has been implemented.
The content of the design change includes: polisher vessel overpressurization protection, powdered resin sampling equipment in vessel discharge piping, repair of polisher vessel control valve seats, and redesign of polisher vessel filter elemente to provide sealing at the element tube sheet.
The modifications are designed to prevent powdered resin migration from the polisher system to the unit feedwater system.
In summary, final testing to complete the requirements of the design change are in process.
Af ter completion of the system check (required due to the extended period of system standby), we plan to return the polisher system to service.
Return to service is e:tpected to be by June 20, 1981.
Condensate polishing will then provide treatment to the condensate for continued improved feedwater chemistry and shorter cleanup periods following unit transients or outages.
an, no357 p
m o Vamonwar EtscTmic Ann Powsm Courawv to If you have any questions or comments, please contact us.
Very truly yours, B. Rr Sylvia Manager - Nuclear Operations and Maintenance cc:
Mr. James P. O'Reilly, Director i
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