ML20067D503

Advises That Util Intends to Terminate Hydrogen Monitoring Program.Parameters of Data Received Impossible to Control in Power Plant Environ to Degree Necessary to Perform Accurate & Meaningful Interpretation of Collected Data

ML20067D503
Person / Time
Site:	North Anna
Issue date:	12/08/1982
From:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	Clark R, Harold Denton Office of Nuclear Reactor Regulation
References
670, AB19-2-20, NUDOCS 8212130319
Download: ML20067D503 (1)

Text

- _ _ _ _ . _-- _ _ _ . -_ _ __ . _ _ _ . - _ - _ _ _ _ - _ - _ _ _ _ _ _ _ _ _

VIRGINIA ELucTHIC AND Powan COMPANY Hicuxown,VrmornrA 20261 4

w.L.srswaar vic r... .. , December 8, 1982 NL'CL.A. OPM.47 son.

Mr. Harold R. Denton, Director Serial No. 670 Office of Nuclear. Reactor Regulation NOCHP/WAT:ba Attention: Mr. Robert A. Clark, Chief Docket No. 50-338 Operating Reactors Branch No. 3 License No. NPF-4 Division of Licensing 4 U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Centlemen:

Ilydrogen Monitoring Program North Anna Power Station - Unit 1 In our December 10, 1979 letter, Serial No. 1003, we indicated that we would purchase and install hydrogen monitors on Unit 1 at North Anna. This was done in an effort to qualify and quantify the effectivenss of the Boric Acid Treatment Program in arresting steam generator support plate corrosion. In our September 16, 1980 letter, Serial No. 794, we indicated that the lack of hydrogen baseline data had hampered the analysis of the effectiveness = of the Hydrogen Monitoring Program.

This lack of baseline data has reduced the effectiveness of the monitoring

program based on hydrogen evolution data obtained so far. The hydrogen analyzers will only give indications of gross, generalized corrosion that may occur. The data being recorded can be affected by a large number of plant conditions such as chemical feed rates and concentrations, cooling - water j temperature variations and flow rates through the monitors themselves, and

primary hydrogen concentrations and permeability rates. It has been Vepco's -

experience over the past two years that these parameters are virtually impossible to control in a power plant environment to the degree necessary to perform an accurate and meaningful interpretation of the collected data, l

i Based on this experience and in conjunction with the positive results and

, observations concerning corrosion abatement as indicated through the steam l generator inspection programs, Vepco intends to terminate the Hydrogen Monitoring Program on North Anna Unit 1.

r If further information is required, please feel free to contact us.

Very truly yours, D'L % &

W. L. Stewart l

cc

Mr. James P. O'Reilly Region II 8212130319 821208 PDR ADOCK 05000338 P PDR L