Experimental studies on the coupled THMC processes by couple equipment

COUPLE施設を用いたTHMC試験

藤崎 淳; 鈴木 英明*; 藤田 朝雄 ; 伊藤 彰*; 小田 好博 

Fujisaki, Kiyoshi; Suzuki, Hideaki*; Fujita, Tomoo; Ito, Akira*; Oda, Yoshihiro

高レベル廃棄物地層処分システムにおけるニアフィールドの性能を評価するうえで、熱-水-応力-化学連成現象の評価が重要な課題の一つになっている。このようなTHMC現象の解明のためにCOUPLE施設を用いた試験研究が行われてきている。本論では、COUPLE施設を用いた試験結果を示すとともに、TH現象と化学現象にかかわる予備的な解析結果について示す。

An important part of the safety assessments of near field in a geological disposal system of high-level radioactive waste consists an assessment of the coupled thermal-hydraulic-mechanical and chemical (THMC) phenomena. In order to validate the newly developed THMC model, the engineered scale experimental studies on the coupled THMC processes by COUPLE equipment have been carried out with a simulated engineered barrier surrounded by a mortar block. In this experiment, temperature at heater and side surface of mortar block was controlled at constant temperature, respectively. And high-pH water reacted with mortar infiltrates into the buffer material. This paper presents the results of measured data by various sensors during the experiment and sampling data of pH and leaching cations in buffer material after the experiment, in COUPLE equipment. And also the results of preliminary simulations on coupled T-H processes and chemical process in the experiment are described.