TRITIUM CONCENTRATION MEASUREMENT DEVICE AND TRITIUM CONCENTRATION MEASUREMENT METHOD

• Main Authors: NAITO SUSUMU, NAKAYAMA KOICHI, IZUMI MIKIO
• Format: Patent
• Language: English; Japanese
• Published: 01.06.2017
• Subjects: MEASUREMENT OF NUCLEAR OR X-RADIATION; MEASURING; PHYSICS; TESTING

PROBLEM TO BE SOLVED: To provide a tritium concentration measurement technique for quantifying tritium contained in water which is stored in a large-capacity tank at low concentration with high accuracy for a short period of time.SOLUTION: A tritium concentration measurement device 10 includes: a tank 12 for storing treated water 11 obtained by performing treatment of removing an ionic radioactive nuclide on water which has passed near debris of a nuclear fuel; an agitation part 20 for agitating the treated water 11 stored in the tank 12; a sampling part 13 for partially taking the agitated treated water 11 as samples 15 out of the tank 12; an analysis part 30 for quantitatively analyzing tritium contained in the taken samples 15; and a concentration calculation part 14 for calculating the concentration of the tritium in the treated water 11 stored in the tank 12 on the basis of a plurality of results of the quantitative analysis performed on the plurality of samples 15 which have been intermittently taken.SELECTED DRAWING: Figure 1 【課題】大容量タンクに貯蔵される水に低濃度で含有されるトリチウムを、短時間で高精度に定量するトリチウム濃度測定技術を提供する。【解決手段】トリチウム濃度測定装置１０において、核燃料デブリの近傍を通過した水に対しイオン性放射性核種の除去処理を実施した処理水１１を蓄積するタンク１２と、このタンク１２に蓄積されている処理水１１を撹拌する撹拌部２０と、撹拌されている処理水１１の一部を試料１５としてタンク１２の外部に採取する採取部１３と、採取された試料１５に対し含まれているトリチウムの定量分析を行う分析部３０と、断続的に採取された複数の試料１５に対して行った複数の定量分析の結果に基づいてタンク１２に蓄積されている処理水１１のトリチウム濃度を計算する濃度計算部１４と、を備える。【選択図】 図１