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平田 早紀子*; 日下 良二; 明地 省吾*; 為国 誠太*; 奥寺 洸介*; 浜田 昇賢*; 坂本 知優*; 本田 匠*; 松下 高輔*; 村松 悟*; et al.
Inorganic Chemistry, 62(1), p.474 - 486, 2023/01
被引用回数：0 パーセンタイル：0.01(Chemistry, Inorganic & Nuclear)A new technique, surface-enhanced infrared absorption (SEIRA) spectroscopy, was used for the structural investigation of lanthanide (Ln) and actinide (An) complexes containing organic ligands. We synthesized thiol derivatives of organic ligands with coordination sites similar to those of diglycolamide (DGA), Cyanex-272, and 
-tetrakis(2-pyridinylmethyl)-1,2-ethanediamine (TPEN), which have been used for separating Ln and An through solvent extraction. These ligands were attached on a gold surface deposited on an Si prism through S-Au covalent bonds; the gold surface enhanced the IR absorption intensity of the ligands. Aqueous solutions of Ln (Eu
, Gd, Tb) and An (Am) ions were loaded onto the gold surface to form ion complexes. The IR spectra of the ion complexes were obtained using FT-IR spectroscopy in the attenuated total reflection mode. In this study, we developed a new sample preparation method for SEIRA spectroscopy that enabled us to obtain the IR spectra of the complexes with a small amount of ion solution (5 
L). This is a significant advantage for the IR measurement of radiotoxic Am complexes. In the IR spectra of DGA, the band attributed to C=O stretching vibrations at 
1630 cm
shifted to a lower wavenumber by 20 cm upon complexation with Ln and An ions. Moreover, the amount of the red-shift was inversely proportional to the extraction equilibrium constant reported in previous studies on solvent extraction. The coordination ability of DGA toward Ln and An ions could be assessed using the band position of the C=O band. The Cyanex-272- and TPEN-like ligands synthesized in this report also showed noticeable SEIRA signals for Ln and An complexes. This study indicates that SEIRA spectroscopy can be used for the structural investigation of ion complexes and provides a microscopic understanding of selective extraction of Ln and An.
齋藤 伸三; 岡本 孝司*; 片岡 勲*; 杉山 憲一郎*; 村松 健*; 一宮 正和*; 近藤 悟; 与能本 泰介
Proceedings of 23rd International Conference on Nuclear Engineering (ICONE-23) (DVD-ROM), 10 Pages, 2015/05
Japan Atomic Energy Agency set up "Advisory Committee on Monju Safety Requirements" in order to establish original safety requirements expected to the prototype FBR "Monju" SFRs use sodium as coolant. It is not necessary to increase primary system pressure for power generation because of the high boiling point of sodium (883
C at atmospheric pressure) and sodium coolant liquid level can be maintained by guard vessels. It would therefore not result in core uncovering accident in early stage even in the case of a loss of primary coolant accident which could occur in LWRs, and hence forced pressure reduction and coolant injection are not necessary for SFRs. Liquid sodium can be used in the wide temperature range and be cooled by natural circulation. In addition, multiple accident management strategies by manual operation can be applied because temperature increase is generally gradual even under accident conditions and grace period (several to several ten hours) before significant core damage occurs can be achieved due to large heat capacity of sodium in systems. This paper summarizes the above mentioned safety requirements expected to Monju discussed by the committee.
村松 壽晴; 村田 正幸*; 家田 芳明; 山口 彰; 永田 敬; 菅原 悟
PNC TN9410 91-318, 48 Pages, 1991/10
大洗工学センター技術開発部プラント工学室で設計研究が進められている大型炉について、液面近傍流速を効果的に低減させ得る原子炉構造を得ること(カバーガス巻き込み防止の観点)を目的として、単相多次元熱流動解析コードAQUAを用いて検討を行った。具体的には、液面近傍に部分的に設置するディッププレート(部分ディッププレート)を対象とし、その設置条件(深さおよび幅)を変化させてその効果を明らかにした。得られた結果は、次の通りである。1)今回解析をい行った部分ディッププレート設置条件では、その深さを0.75m、その幅を1.905mとした場合に、最も液面近傍流速が低減できることが示された。この条件での値は、約0.33m/sであり、もんじゅでの値にほぼ等しい。2)温度成層化現象の発生の程度では、もんじゅ条件を上回る445度C/mの値が計算された。部分ディッププレート設備を採用する際には、温度成層化現象を積極的に解消させるための設備対応が必要となる。3)系統熱過渡特性では、もんじゅ条件(最大-0.28C/s)を若干上回る最大-0.51C/sの値が計算された。4)周方向温度分布特性に関しては、最大約67C/mの値が計算された。この値は、ディッププレートを設置しない場合の約5倍の値に相当する。
明地 省吾*; 平田 早紀子*; 日下 良二; 本田 匠*; 為国 誠太*; 村松 悟*; 齋藤 健一*; 平尾 岳大*; 灰野 岳晴*; 渡邉 雅之; et al.
no journal, ,
Recently, we have been performing surface-enhanced infrared absorption (SEIRA) spectroscopy of Eu complexes, aiming for clarifying the origin of selectivity of O-donor/N-donor ligands toward lanthanides (Ln)/minor actinides (MA) in radioactive waste treatments. In this study, we improved the SEIRA setup to extend the study to complexes of Am (MA), which is a radioactive nuclide. We made a new sample vessel with smaller internal volume and higher sealing ability, where we successfully reduced the radiation exposure (less than 1 Sv) during the experiment. In the actual measurement of Am
DGA complex, the absorption of the C=O stretching of the amide unit was observed at 1621 cm; it is redshifted by 8 cm from the Eu complex, one of the lanthanides, which was supported by theoretical calculations.
