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Effects of boron on revaporization of iodine and cesium compounds in a severe accident condition

シビアアクシデント条件におけるセシウム及びヨウ素化合物の再蒸発に与えるホウ素の影響評価

三輪 周平; 品田 雅則; 逢坂 正彦; 杉山 智之; 丸山 結

Miwa, Shuhei; Shinada, Masanori; Osaka, Masahiko; Sugiyama, Tomoyuki; Maruyama, Yu

ソースターム評価手法の高度化に資する核分裂生成物の炉内移行時における化学挙動に係るデータ取得を目的に、シビアアクシデント時の原子炉冷却系内の温度条件を模擬した装置によりセシウム(Cs)及びヨウ素(I)から成る沈着物と酸化ホウ素( B$$_{2}$$O$$_{3}$$)の蒸気種/エアロゾルの化学反応実験を実施した。沈着物とB$$_{2}$$O$$_{3}$$蒸気種/エアロゾルの反応により揮発性I化合物が生成し、有意量のIが再蒸発することがわかった。

In order to acquire the data on fission product chemical behavior during transport in a reactor for the improvement of source term evaluation method, we performed the chemical reaction tests of cesium (Cs) and iodine (I) deposits and boron oxide (B$$_{2}$$O$$_{3}$$) vapor/aerosol using the apparatus which can simulate temperature conditions of reactor coolant system under a sever accident. The volatile I compounds were formed by the reaction of B$$_{2}$$O$$_{3}$$ vapor/aerosol and deposit, and significant amount of I was revaporized from the deposit.

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