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報告書

高レベル放射性物質研究施設における放射性廃液の安定化処理

小木 浩通*; 荒井 陽一; 粟飯原 はるか; 渡部 創; 柴田 淳広; 野村 和則

JAEA-Technology 2021-007, 27 Pages, 2021/06

JAEA-Technology-2021-007.pdf:2.43MB

放射性物質取扱施設である高レベル放射性物質研究施設(CPF: Chemical Processing Facility)では、過去の試験や分析で発生した多種の廃液をホットセル及びグローブボックス内で保管してきた。2015年7月より、保管されている放射性廃液について、管理方法の適正化を図るべく、実廃液の安定化処理を進めている。また、分析廃液等の多種多様な試薬が混在する廃液については安定化処理が非常に困難であるため、大学等と共同でSTRAD(Systematic Treatments of Radioactive liquid wastes for Decommissioning)プロジェクトを発足させ、処理技術の研究開発を進めている。これらの実績は、他の放射性物質取り扱い施設においても保管する廃液の処理をより効率的かつ安全に進められることが期待できる。本書は、CPFで安定化処理を実施した実廃液の処理方法及び処理状況に関して報告するものである。

論文

Observation of Eu adsorption band in the CMPO/SiO$$_{2}$$-P column by neutron resonance absorption imaging

宮崎 康典; 渡部 創; 中村 雅弘; 柴田 淳広; 野村 和則; 甲斐 哲也; Parker, J. D.*

JPS Conference Proceedings (Internet), 33, p.011073_1 - 011073_7, 2021/03

中性子共鳴吸収イメージングを、抽出クロマトグラフィに使用するマイナーアクチノイド回収用CMPO/SiO$$_{2}$$-Pカラムで形成したEu吸着バンドの観測に適用した。軽水や重水で調製した湿潤カラムと乾燥吸着材を充填した乾燥カラムを比較し、中性子透過を評価した。中性子透過スペクトルから、乾燥カラムは45%、軽水調製カラムは20%、重水調製カラムは40%の中性子透過を確認した。得られた結果から、CMPO/SiO$$_{2}$$-Pカラムに形成したEu吸着バンドを観測するには、重水の使用によって、より鮮明になることを明らかにした。今後、カラム操作による吸着バンドのカラム内移行挙動を明らかにする。

論文

Microscopic analyses on Zr adsorbed IDA chelating resin by PIXE and EXAFS

荒井 陽一; 渡部 創; 大野 真平; 野村 和則; 中村 文也*; 新井 剛*; 瀬古 典明*; 保科 宏行*; 羽倉 尚人*; 久保田 俊夫*

Nuclear Instruments and Methods in Physics Research B, 477, p.54 - 59, 2020/08

 被引用回数:0 パーセンタイル:0.02(Instruments & Instrumentation)

Used PUREX process solvent generated from reprocessing process of spent nuclear fuel contains a small amount of U and Pu complexed with tributyl phosphate (TBP) or dibutyl phosphate (DBP). The radioactive nuclides should be removed from the solvent for safety storage or disposal. The iminodiacetic acid (IDA) type chelating resin was proposed as promising procedures for efficient recovery of the trapped cations in the solvent. In order to reveal the distribution and amount of Zr in the particle and local structure of Zr complex formed in the adsorbent, PIXE and EXAFS analyses on the Zr adsorbed chelating resin were carried out. Micro-PIXE analysis proved that it is an effectual method for quantitative analysis of trace adsorbed elements. Moreover, some of the adsorption sites were possibly occupied by the molecules. On the other hand, Zr-K edge EXAFS analysis suggested that extraction mechanism of Zr from the aqueous solution and the solvent was different.

論文

Structural characterization of Eu-HONTA complexes by IBIL and EXAFS analyses

渡部 創; 佐野 雄一; 岡田 諒*; 松浦 治明*; 羽倉 尚人*; 加田 渉*

Nuclear Instruments and Methods in Physics Research B, 477, p.60 - 65, 2020/08

 被引用回数:1 パーセンタイル:0.02(Instruments & Instrumentation)

抽出クロマトグラフィを用いたMA回収技術開発のためのHONTA含侵吸着材中に形成されるEu錯体の局所構造を、EXAFSとIBILとを組み合わせた手法により調査した。本分析により、吸着材中と溶媒中とで形成される錯体構造の微小な変化をとらえることができることが明らかとなった。

論文

Quantitative analysis of Zr adsorbed on IDA chelating resin using Micro-PIXE

荒井 陽一; 渡部 創; 大野 真平; 野村 和則; 中村 文也*; 新井 剛*; 瀬古 典明*; 保科 宏行*; 久保田 俊夫*

QST-M-23; QST Takasaki Annual Report 2018, P. 59, 2020/03

Radioactive spent solvent waste contains U and Pu is generated from reprocessing process of spent nuclear fuel. The nuclear materials should be removed from the solvent for safety storage or disposal. We are focusing on the nuclear materials recovery from spent solvent using imino diacetic acid (IDA) type chelating resin as a promising method. In order to reveal adsorbed amount of Zr, which is simulated of Pu, Micro-Particle Induced X-ray Emission (PIXE) was carried out. Micro-PIXE analysis succeeded in quantitative analysis on trace amount of adsorbed Zr from simulated spent solvent.

論文

Improvement in flow-sheet of extraction chromatography for trivalent minor actinides recovery

渡部 創; 先崎 達也; 柴田 淳広; 野村 和則; 竹内 正行; 中谷 清治*; 松浦 治明*; 堀内 勇輔*; 新井 剛*

Journal of Radioanalytical and Nuclear Chemistry, 322(3), p.1273 - 1277, 2019/12

 被引用回数:0 パーセンタイル:0.01(Chemistry, Analytical)

Extraction chromatography flow-sheet employing octyl(phenyl)-$$N,N$$-diisobutylcarbonoylmethylphosphine oxide (CMPO) and $$bis$$(2-ethylhexyl) hydrogen phosphate (HDEHP) extractants for trivalent minor actinide recovery was modified to improve column separation performance. Excellent trivalent minor actinides recovery performance was obtained by column separation experiments on nitric acid solution containing the trivalent minor actinides and representative fission product elements, i.e. recovery yields $$>$$ 93% with sufficient decontamination factors against the fission products. Those are the best performance which we have ever obtained by experiments inside hot cell.

論文

STRAD project for systematic treatments of radioactive liquid wastes generated in nuclear facilities

渡部 創; 小木 浩通*; 荒井 陽一; 粟飯原 はるか; 高畠 容子; 柴田 淳広; 野村 和則; 神谷 裕一*; 浅沼 徳子*; 松浦 治明*; et al.

Progress in Nuclear Energy, 117, p.103090_1 - 103090_8, 2019/11

 被引用回数:5 パーセンタイル:58.77(Nuclear Science & Technology)

A new collaborative research project for systematic treatments of radioactive liquid wastes containing various reagents generating in nuclear facilities was started from 2018 initiated by Japan Atomic Energy Agency. The project was named as STRAD (Systematic Treatments of RAdioactive liquid wastes for Decommissioning) project. Tentative targets to be studied under the project are aqueous and organic liquid wastes which have been generated by experiments and analyses in a reprocessing experimental laboratory of JAEA. Currently fundamental studies for treatments of the liquid wastes with complicated compositions are underway. In the STRAD project, process flow for treatment of ammonium ion involved in aqueous waste was designed though the inactive experiments, and decomposition of ammonium ion using catalysis will be carried out soon. Adsorbents for recovery of U and Pu from spent solvent were also developed. Demonstration experiments on genuine spent solvent is under planning.

論文

Extraction mechanism of lanthanide ions into silica-based microparticles studied by single microparticle manipulation and microspectroscopy

大高 稔紀*; 佐藤 辰巳*; 大野 真平; 名越 航平; 安倍 諒治*; 新井 剛*; 渡部 創; 佐野 雄一; 竹内 正行; 中谷 清治*

Analytical Sciences, 35(10), p.1129 - 1133, 2019/10

 被引用回数:0 パーセンタイル:0(Chemistry, Analytical)

Single porous silica microparticles coated with styrene-divinylbenzene polymer (SDB) impregnated with octyl(phenyl)-N,N-diisobutylcarbamoylmethylphosphine oxide (CMPO) were injected into an aqueous 3 mol/L nitric acid solution containing trivalent lanthanide (Ln(III)), as a high-level liquid waste model, using the microcapillary manipulation-injection technique; and the extraction rate of Ln(III), as an Ln(III)-CMPO complex, into the single microparticles was measured by luminescence microspectroscopy. The extraction rate significantly depended on the Ln(III), CMPO, or NO$$_{3}$$$$^{-}$$ concentration, and was analyzed in terms of diffusion in the pores of the microparticles and complex formation of Ln(III). The results indicated that the rate-determining step in Ln(III) extraction was the diffusion in the pore solution of the microparticles.

論文

Stabilization processing of hazardous and radioactive liquid wastes derived from advanced aqueous separation experiments for safety handling and management of waste

中原 将海; 渡部 創; 小木 浩通*; 荒井 陽一; 粟飯原 はるか; 本山 李沙; 柴田 淳広; 野村 和則; 梶並 昭彦*

Proceedings of International Nuclear Fuel Cycle Conference / Light Water Reactor Fuel Performance Conference (Global/Top Fuel 2019) (USB Flash Drive), p.66 - 70, 2019/09

高レベル放射性物質研究施設では、先進湿式分離試験に由来する多種多様な有害性及び放射性液体廃棄物が発生する。そのため、これらを安全に取り扱い及び管理するために安定化処理を行う必要がある。今回は、これらの溶液に含まれる有害物質の沈殿処理若しくは酸化処理、核物質回収のための溶媒抽出による分離、フリーズドライ法を用いた濃縮処理について報告する。

論文

Ion beam induced luminescence of complexes formed in adsorbent for MA recovery process

渡部 創; 片井 雄也*; 松浦 治明*; 加田 渉*; 江夏 昌志*; 佐藤 隆博*; 新井 剛*

Nuclear Instruments and Methods in Physics Research B, 450, p.61 - 65, 2019/07

 被引用回数:1 パーセンタイル:24.18(Instruments & Instrumentation)

Ion-beam induced luminescence (IBIL) analysis on MA recovery adsorbent was performed to give chemical states of complexes formed in the adsorbent as fundamental information for process design, and EXAFS analysis was also carried out to support discussions. The IBIL spectra of the binary extractants system seemed to be superposition of individual ones, however it has also original peaks. As intensities of those peaks rapidly decreased with iteration time of measurements and the original peaks were not observed for the adsorbent without charging Eu(III), they were attributed to complexes of Eu(III) with organic compounds. Contributions of CMPO and HDEHP extractants for Eu(III) extraction must be not only individual ones but also cooperative.

論文

Waste management in a Hot Laboratory of Japan Atomic Energy Agency, 3; Volume reduction and stabilization of solid waste

中原 将海; 渡部 創; 小木 浩通*; 柴田 淳広; 野村 和則

International Journal of Nuclear and Quantum Engineering (Internet), 13(4), p.191 - 194, 2019/04

日本原子力研究開発機構の高レベル放射性物質研究施設では、高レベル放射性固体廃棄物は減容若しくは安定化処理することになっている。ホットセル内で発生するプラスチック製品は、主に溶融し、減容している。また、金属等の固体廃棄物はバンドソーにより減容している。抽出クロマトグラフィにより発生した使用済の吸着材は、コールド試験により電気炉で加熱することで、有機物質を安定に分解処理できることが確認された。

論文

Waste management in a Hot Laboratory of Japan Atomic Energy Agency, 2; Condensation and solidification experiments on liquid waste

渡部 創; 小木 浩通*; 柴田 淳広; 野村 和則

International Journal of Nuclear and Quantum Engineering (Internet), 13(4), p.169 - 174, 2019/04

STRADプロジェクトの一環として、RO膜装置を用いた放射性廃液の濃縮試験を実施した。溶液中のアンモニウムイオンが濃縮され、廃液中の濃度を目標値である100ppmより低下させることに成功した。水相及び有機相廃液の固化試験も合わせて実施し、それぞれセメント又は凝固剤を添加することで固化することに成功した。しかし長期保管の観点からは添加材の最適化が必要であることが分かった。

論文

Influences of pore and particle sizes of CMPO/SiO$$_{2}$$-P adsorbent on extraction chromatography process

渡部 創; 佐野 雄一; 三田 修平*; 桜井 翔太*; 新井 剛*

日本イオン交換学会誌, 30(1), p.8 - 16, 2019/01

In order to optimize operability of the adsorbents in the extraction chromatography system and to enhance the performance of the adsorbent, CMPO/SiO$$_{2}$$-P adsorbents with various pore and particle sizes were prepared, and characteristics of the adsorbents were evaluated through distribution coefficient, adsorption isotherm, adsorption rate, and breakthrough/elution behavior. Adsorption capacity was dominated not by the structure of the adsorbent but by amount of the extractant impregnated. The adsorbent with the largest pore size were revealed to show quick elution with short tail. Enlargement in the pore size must be one of the most effective improvements of the adsorbents to enhance the adsorption/elution performance. Adsorbent with particle size of more than 200 $$mu$$m formed channeling or voids inside the bed. They are suspected to lead slow adsorption/elution behavior, and smaller adsorbents must be desirable in the respect of performance of the column.

論文

Waste management in a hot laboratory of Japan Atomic Energy Agency, 1; Overview and activities in chemical processing facility

野村 和則; 小木 浩通*; 中原 将海; 渡部 創; 柴田 淳広

International Journal of Nuclear and Quantum Engineering (Internet), 13(5), p.209 - 212, 2019/00

Chemical Processing Facility of Japan Atomic Energy Agency is a basic research field for advanced back-end technology developments with using actual high-level radioactive materials. Most of them were treated properly and stored in the liquid waste vessel, but some were not treated and remained at the experimental space as a kind of legacy nuclear waste, which we must treat in safety and dispose if we continue research activities in the facility. Under this circumstance, we launched a collaborative research project called the STRAD project, which stands for Systematic Treatment of Radioactive liquid waste for Decommissioning, in order to develop the treatment processes for wastes of the nuclear research facility. In this project, decomposition methods of certain chemicals, which have been directly solidified without safety pretreatment but may cause a troublesome phenomenon, is developing and a prospect that it will be able to decompose in the facility by simple method. And solidification of aqueous or organic liquid wastes after the decomposition has been studied by adding cement or coagulants. Furthermore, we treated experimental tools of various materials with making an effort to stabilize and to compact them before the package into the waste container. It is expected to decrease the number of transportation of the solid waste and widen the operation space. The project is expected to contribute beneficial waste management outcome that can be shared world widely.

論文

Characteristics of TPDN/SiO$$_{2}$$-P adsorbent for MA(III) recovery

小藤 博英; 渡部 創; 竹内 正行; 鈴木 英哉; 松村 達郎; 塩飽 秀啓; 矢板 毅

Progress in Nuclear Science and Technology (Internet), 5, p.61 - 65, 2018/11

Applicability of newly developed MA(III)/RE(III) separation extractant TPDN for the extractionchromatography technology was evaluated through series of fundamental characterizations. The adsorbentselectively extract $$^{241}$$Am from diluted high level liquid waste and sufficient performance for MA(III)/RE(III)separation process was confirmed. Durability and behavior in the vitrification process of the adsorbent alsosuggested that the new adsorbent can be employed as a material for reprocessing of spent fuels.

論文

Selective Sc recovery from rare earths in nitric acid medium by extraction chromatography

渡部 創; 鈴木 英哉; 後藤 一郎*; 小藤 博英; 松村 達郎

日本イオン交換学会誌, 29(3), p.71 - 75, 2018/09

Chemical compounds containing scandium (Sc) are widely applied to various fields such as catalysts, alloys, lamps and etc. Sc is found in mineral ore, and it is necessary to develop efficient Sc separation and recovery technology for the industrial applications. So far, solvent extraction based processes were proposed as promising Sc recovery procedures. Our group has found that hexaoctyl nitrilotriacetic acid triamide (HONTA) has strong affinity to Sc. In this study, applicability of the extraction chromatography technology for the selective Sc recovery was experimentally evaluated through batch-wise adsorption/elution studies and column separation experiments.

論文

Am, Cm recovery from genuine HLLW by extraction chromatography

渡部 創; 佐野 雄一; 小藤 博英; 竹内 正行; 柴田 淳広; 野村 和則

Journal of Radioanalytical and Nuclear Chemistry, 316(3), p.1113 - 1117, 2018/06

 被引用回数:4 パーセンタイル:47(Chemistry, Analytical)

Am(III) and Cm(III) recovery experiments with the extraction chromatography technology were carried out on genuine HLLW obtained by reprocessing of the Fast Reactor fuel. Modification of the flow-sheet with 2 steps column operations using CMPO/SiO$$_{2}$$-P and HDEHP/SiO$$_{2}$$-P adsorbents achieved more than 90% recovery yields for Am(III) and Cm(III) with decontamination factor of 1000 for Eu(III). This is a significant progress in development of the technology for the implementation.

論文

Microanalysis of silica-based adsorbent for effective recovery of radioactive elements

佐野 雄一; 渡部 創; 松浦 治明*; 名越 航平*; 新井 剛*

Journal of Nuclear Science and Technology, 54(10), p.1058 - 1064, 2017/10

 被引用回数:3 パーセンタイル:41.49(Nuclear Science & Technology)

ポリマー架橋度が吸着材の吸着・溶離性能に与える影響についてポリマー架橋度をパラメータとした吸着材を用いた試験により評価するとともに、その要因をSTXM分析及びEXAFS分析により考察した。吸着材中に形成された金属錯体構造については、ポリマー架橋度により大きな違いは生じないことを確認した。一方、ポリマー架橋度の増加に伴いポリマーは細孔中に均一に広がる様子が認められるとともに、架橋度が高い条件では細孔が狭小化し、水分子が捕捉されやすくなるため、溶離率が低下するものと考えられた。

論文

Micro-PIXE analysis on adsorbent of extraction chromatography for MA(III) recovery

高畠 容子; 渡部 創; 小藤 博英; 竹内 正行; 野村 和則; 佐藤 隆博*

International Journal of PIXE, 26(3&4), p.73 - 83, 2017/09

BB2016-1248.pdf:0.36MB

次世代再処理ガラス固化技術基盤研究で技術開発を行っている吸着ガラスについて、開発の対象とする抽出クロマトグラフィ技術に用いる吸着材の吸着元素分布情報をマイクロPIXE分析により明らかにすることを検討している。本研究では高レベル放射性廃液の模擬液をカラム法にて吸着並びに吸着/溶離した吸着材を用いて、実使用に即した条件下での吸着材の元素分布情報取得に対するマイクロPIXE技術の適用性評価を行った。検討に供した吸着材はCMPO/SiO$$_{2}$$-P吸着材及びHDEHP/SiO$$_{2}$$-P吸着材であり、分析には高崎量子応用研究所のシングルエンド加速器を用いた。分析結果より、カラム内での吸着バンドの形成や溶離後に吸着材に残留する元素の存在を確認できた。これより、マイクロPIXE分析を吸着材性能の定性的な評価に適用することが期待できた。

論文

Actinides recovery from irradiated fuel for SmART cycle

佐野 雄一; 渡部 創; 中原 将海; 粟飯原 はるか; 竹内 正行

Proceedings of International Nuclear Fuel Cycle Conference (GLOBAL 2017) (USB Flash Drive), 4 Pages, 2017/09

CPFにおいて照射済燃料から数gのMAを回収し、AGFにおいてMA含有MOX燃料を製造した後、常陽において照射試験を行うSmARTサイクル構想を進めている。本報告では、CPFで実施したMAを含むアクチニド回収に係る研究開発について、過去実施した溶媒抽出法及び抽出クロマトグラフィによるアクチニド回収技術をレビューするとともに、SmARTサイクルの一環として実施した各方法によるアクチニド回収試験の概要をまとめた。

196 件中 1件目~20件目を表示