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高速実験炉「常陽」運転試験報告書; 回転プラグ温度分布測定試験

Experimental fast reactor "JOYO" operational test; Temperature distribution test of rotating plugs

石鳥 隆司*; 向坊 隆一*; 米田 吉之*; 井上 晃次*; 横田 淑生*; 藤原 昭和*; 佐藤 勲雄*

not registered; not registered; not registered; Inoue, Teruji*; not registered; not registered; not registered

高速実験炉「常陽」の回転プラグの内部及び表面の温度を測定し,軸方向及び同一平面内での時間変化をグラフにプロットし,各運転サイクルにおける温度分布について検討を行い,以下の事項が明らかになった。回転プラグ全体の温度分布は炉心上部機構が高く,小回転プラグ,大回転プラグの順に低くなる傾向があり,原子炉起動後一週間程でほぼ定常状態に達する。回転プラグの内部・表面の温度とも数日あるいはそれ以上のサイクルで周期的に変化する傾向が見られず,50MW出力上昇から75MW第6サイクルまでの運転サイクルで著しいナトリウムペーパの局所的付着によると推定される温度変化は見いだされない。

The reactor power of the Experimental Fast Reactor Joyo was raised to 50 MW in July, 1978 and then to 75 MW in July, 1979. This report discribes the temperature distributions of the rotating plugs of Joyo measured from April, 1978 through December, 1981. The following results were obtained. (1)The overall temperature distributions of the large rotating plug the samll rotating plug, and the upper-core-structure have a tendency to become higher in this order and become steady state within about a week. (2)The temperature distributions of the rotating plugs have no tendency to change periodically within either a few days or longer period, and unusual temperature distributions due to imbalanced sodium vapor deposition have not been detected.

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