METHOD FOR REDUCING DISPOSITION LOAD OF HIGH-LEVEL RADIOACTIVE WASTE

• Main Authors: KAKINOKI KOICHI, TSUKAMOTO TAISUKE, SHIMADA TAKASHI, KISHIMOTO KAZUYA, OGAWA NAOKI
• Format: Patent
• Language: English; Japanese
• Published: 20.08.2020
• Subjects: DECONTAMINATION ARRANGEMENTS THEREFOR; NUCLEAR ENGINEERING; NUCLEAR PHYSICS; PHYSICS; PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULARRADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL

To provide a reduction method of a high-level radioactive waste (HALW) disposition load in which a minor actinoid (MA) from the HALW being a waste liquid separating uranium and plutonium from solutions of used nuclear fuels is separated and stored regardless of a situation where a MA burning technology is in practical use, a sealed period of a glass solidified body of the HALW can be shortened, and what is more, the number of processes or amount of waste solution upon separating and storing the MA can be suppressed.SOLUTION: In a reduction method of a HALW disposition load according to one embodiment of the present invention, the reduction method is configured to: perform separation processing of separating a MA from the HALW together with a lanthanoid (Ln); obtain a liquid substance including the MA and Ln, and a liquid medium; perform solidification processing of solidifying the liquid substance; and store an obtained solidified body.SELECTED DRAWING: Figure 1 【課題】マイナーアクチノイド（ＭＡ）燃焼技術の実用化状況にかかわらず、使用済み核燃料の溶液からウラン及びプルトニウムを分離した廃液である高レベル放射性廃棄物（ＨＡＬＷ）からＭＡを分離し保管してＨＡＬＷのガラス固化体の閉じ込め期間を短縮でき、しかもＭＡを分離し保管する際の工程数や廃液量を抑制できる、ＨＡＬＷの処分負荷の低減方法を提供する。【解決手段】本発明の一態様に係るＨＡＬＷの処分負荷の低減方法においては、ＨＡＬＷから、ＭＡをランタノイド（Ｌｎ）とともに分離する分離処理を行い、ＭＡとＬｎと液状媒体とを含む液状物を得て、前記液状物を固化する固化処理を行い、得られた固化体を保管する。【選択図】図１