並列タイトル等Enrichment and measurement of tag gas (No.2); Cryogenic Adsorption test of improved enrichment system
一般注記タグガス濃縮装置の冷却法の改善ならびにタグガス処理能力の向上を目的として,改良型濃縮装置を製作し,濃縮装置の性能試験,大型濃縮筒の吸着特性試験ならびに共吸着アルゴンの分離試験を実施した。主な結果は次のとおりである。(1)冷媒として液化窒素のみを使用して,-180$\sim$+360$^{\circ}C$の温度を制御し得るコンパクトにまとまった改良型濃縮装置を製作した。この装置の冷却性能試験および温度制御性能試験を行い,仕様を十分満足し得ることを確認した。(2)濃縮筒の大型化により,タグガス処理能力をPhase(I)試験の約50倍(2.7m$\times$3/hr)に向上し得たこと,ならびに極低濃度領域におけるクリプトンの濃縮性能を大巾に改善し得たことなど,所期の目的を達成できた。(3)濃縮筒の大型化に伴って残留アルゴン量が多くなり,これがクリプトンおよびキセノンの同位体比測定を妨害することが認められた。これを避けるためには,深冷吸着システムを一段追加すればよいことがわかった。(4)改良型濃縮装置を用いて市販アルゴン中のクリプトンおよびキセノンを濃縮し,これを測定した結果,それらの濃度は各々3$\times$10$\times$3ppbおよび8$\times$10$\times$-4ppbであった。これらのクリプトンおよびキセノンは,タグガスの測定上無視し得る濃度であることがわかった。本試験研究の結果は,原型炉「もんじゅ」の破損燃料位置検出系の計画に反映される。
The purpose of this study is to improve the cooling method of tag gas enrichment system and to advance the system performance. With this purpose, an improved enrichment system was fabricated, and examinations were conducted to confirm thermocontrol function of this system, adsorption characteristics of enlarged enriching tube and the separating condition of argon co-adsorbed. The results are summarised as follows ; (1)An improved enrichment system was fabricated which was compact and could control the temperature in the range from -180$^{\circ}$C to +360$^{\circ}$C using liquid nitrogen as a coolant. It was confirmed that this system was satisfactory in its cooling and thermocontrol function. (2)With the enriching tube enlarged, the treatment performance of feed gas was increased by about 50 times (2.7 m$^{3}$/hr) that of Phase (I) Test, and the enrichment performance of krypton at very low concentration level was remarkably improved, thereby achieving the purpose of present study. (3)It was recognized that the measurement of isotopic ratios of krypton or xenon was interfered by the residual argon whose volume increased as the enriching tube became larger. However, it was found that such interferences could be eliminated by adding one more system of cryogenic adsorption. (4)As the result of enriching krypton and xenon in commercial argon gas with the improved enrichment system. their contents were determined to be 3$\times$10$^{-3}$ ppb and 8 $\times$ 10$^{-4}$ ppb, respectively. It was found that these krypton and xenon contents were negligible for the measurement of tag gas in cover gas. The results of present work is reflected to the design of Failed Fuel Detection and Location system of "MONJU".
一次資料へのリンクURL/PNC-TN941-81-91.pdf （fulltext）
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