Temperature dependence of cobalt release rate from stainless steel in neutral water.
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概要
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In order to evaluate the release source of Co from heated tubes of the feedwater line of BWR, Co release rate measurements were carried out by measuring <SUP>60</SUP>Co released from ir-radiated stainless steel in contact with neutral water at an oxygen concentration of 20 ppb. The temperature- and time-dependences on Co release rate were studied for 670 h release experiments ; the rate was found to decrease in proportion to <I>t</I><SUP>-1/2</SUP> (<I>t</I> : exposure time) and to have its maximum value around 240°C. An empirical equation was obtained for the Co release rates in the temperature range of 150240°C.<BR><I>R</I><SUB>co</SUB> =1.9 x 10<SUP>6</SUP> exp (- 14, 300/ (<I>RT</I>))<I>t</I><SUP>-1/2</SUP><BR>where <I>R</I><SUB>co</SUB> Co release rate (mg/ (dm<SUP>2</SUP>•month)), <I>R</I>: Gas constant (cal/ (mol•deg.) ), <I>T</I>: Ex-posure temperature (K) and <I>t</I>: Exposure time (h). Decrease in the Co release rate with temperatures over 250°C, seemed to be ascribed to the formation of a protective oxide layer on the surface of stainless steel.
- 一般社団法人 日本原子力学会の論文
著者
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Uchida Shunsuke
Energy Research Laboratory Hitachi Ltd.
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OZAWA Yoshihiro
Energy Research Laboratory, Hitachi Ltd.
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KITAMURA Masao
Energy Research Laboratory, Hitachi Ltd.
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