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論文

Neutronic design of basic cores of the new STACY

井澤 一彦; 石井 淳一; 大久保 卓哉; 小川 和彦; 外池 幸太郎

Proceedings of 11th International Conference on Nuclear Criticality Safety (ICNC 2019) (Internet), 9 Pages, 2019/09

日本原子力研究開発機構は臨界実験装置STACYを非均質体系に変更する更新計画を進めている。更新されたSTACYでは、福島第一原子力発電所事故によって生成された燃料デブリを想定した臨界解析結果の検証のための実験が計画されている。STACY更新炉の初臨界は2021年初めに予定されている。初臨界後は、STACYでは「基本炉心」を構成し、運転員の習熟と実験結果の不確かさを把握するための一連の運転が行われる。STACY更新炉の初臨界に先立ち、基本炉心の核特性を把握するための一連の核特性解析を行った。本発表では、基本炉心の炉心構成条件を示すとともに、新規制基準のもとで炉心に課される諸条件をあきらかにする。

論文

Electrochemical adsorption on Pt nanoparticles in alkaline solution observed using in situ high energy resolution X-ray absorption spectroscopy

草野 翔吾*; 松村 大樹; 石井 賢司*; 田中 裕久*; 水木 純一郎*

Nanomaterials (Internet), 9(4), p.642_1 - 642_14, 2019/04

 被引用回数:1 パーセンタイル:82.1(Nanoscience & Nanotechnology)

The oxygen reduction reaction (ORR) on Pt/C in alkaline solution was studied by in situ high energy resolution X-ray absorption spectroscopy. To discuss the X-ray absorption near-edge structure (XANES), this paper introduced the rate of change of the $$Delta mu$$ (RCD), which is an analysis method that is sensitive to surface adsorption. The surface adsorptions as hydrogen (below 0.34 V), superoxide anion (from 0.34 V to 0.74 V), hydroxyl species (from 0.44 V to 0.74 V), atomic oxygen (above 0.74 V), and $$alpha$$-PtO$$_{2}$$ (above 0.94 V) were distinguished. It is clarified that the catalytic activity in an alkaline solution is enhanced by the stability of atomic oxygen and the low stability of superoxide anion/peroxide adsorption on the platinum surface.

論文

Observation of momentum-dependent charge excitations in hole-doped cuprates using resonant inelastic X-ray scattering at the oxygen $$K$$ edge

石井 賢司*; 遠山 貴巳*; 浅野 駿*; 佐藤 研太朗*; 藤田 全基*; 脇本 秀一; 筒井 健二*; 曽田 繁利*; 宮脇 淳*; 丹羽 秀治*; et al.

Physical Review B, 96(11), p.115148_1 - 115148_8, 2017/09

AA2017-0402.pdf:0.81MB

 被引用回数:16 パーセンタイル:23.03(Materials Science, Multidisciplinary)

We investigate electronic excitations in La$$_{2-x}$$(Br,Sr)$$_x$$CuO$$_4$$ using resonant inelastic X-ray scattering (RIXS) at the oxygen $$K$$ edge. We observed momentum-dependent spectral weight below 1 eV, which is consistent with theoretical calculation of the dynamical charge structure factor on oxygen orbitals in a three-band Hubbard model. Our results confirm that the momentum-dependent charge excitations exist on the order of the transfer energy ($$t$$), and the broad spectral line shape indicates damped and incoherent character of the charge excitations at the energy range in the doped Mott insulators.

報告書

原子力施設等の緊急時における被ばく評価事例集

川崎 将亜; 中嶌 純也; 吉田 圭佑; 加藤 小織; 西野 翔; 野崎 天生; 中川 雅博; 角田 潤一; 菅谷 雄基; 長谷川 里絵; et al.

JAEA-Data/Code 2017-004, 57 Pages, 2017/03

JAEA-Data-Code-2017-004.pdf:2.34MB

原子力施設の事故発生時においては、事故による影響及びその範囲を迅速に把握するために、放出された放射性物質による一般公衆への影響や事故による作業者の個人被ばく線量を早期に評価し報告することが求められる。そのため、原子力科学研究所放射線管理部においては、事故発生時の迅速な対応に資するために、一般公衆及び作業者の被ばく線量評価について、評価方法及び必要となる各種パラメータ等を想定される事故事例ごとにまとめ、事例集を整備した。本事例集では、原子力科学研究所で想定される各種事故に加え、過去の原子力事故で放出された放射性物質による被ばく評価について扱っており、これらは緊急時における被ばく評価についての知見・技術の継承にも用いることができる。

論文

Observation of momentum-resolved charge fluctuations proximate to the charge-order phase using resonant inelastic X-ray scattering

吉田 雅洋*; 石井 賢司; 中 惇*; 石原 純夫*; Jarrige, I.*; 池内 和彦*; 村上 洋一*; 工藤 一貴*; 小池 洋二*; 永田 知子*; et al.

Scientific Reports (Internet), 6, p.23611_1 - 23611_8, 2016/03

 被引用回数:0 パーセンタイル:100(Multidisciplinary Sciences)

In strongly correlated electron systems, enhanced fluctuations in the proximity of the ordered states of electronic degrees of freedom often induce anomalous electronic properties such as unconventional superconductivity. While spin fluctuations in the energy-momentum space have been studied widely using inelastic neutron scattering, other degrees of freedom, i.e., charge and orbital, have hardly been explored thus far. Here, we use resonant inelastic X-ray scattering to observe charge fluctuations proximate to the charge-order phase in transition metal oxides. In the two-leg ladder of Sr$$_{14-x}$$Ca$$_x$$Cu$$_{24}$$O$$_{41}$$, charge fluctuations are enhanced at the propagation vector of the charge order ($$mathbf{q}_mathrm{CO}$$) when the order is melted by raising the temperature or by doping holes. In contrast, charge fluctuations are observed not only at $$mathbf{q}_mathrm{CO}$$ but also at other momenta in a geometrically frustrated triangular bilayer lattice of LuFe$$_2$$O$$_4$$. The observed charge fluctuations have a high energy ($$sim$$ 1 eV), suggesting that the Coulomb repulsion between electrons plays an important role in the formation of the charge order.

論文

Large trigonal-field effect on spin-orbit coupled states in a pyrochlore iridate

植松 大介*; 佐賀山 基*; 有馬 孝尚*; 石川 洵*; 中辻 知*; 高木 英典*; 吉田 雅洋*; 水木 純一郎; 石井 賢司

Physical Review B, 92(9), p.094405_1 - 094405_6, 2015/09

 被引用回数:17 パーセンタイル:31.63(Materials Science, Multidisciplinary)

The half-filled topmost valence band of Ir$$^{4+}$$ in several iridates such as Sr$$_2$$IrO$$_4$$, IrO$$_2$$, and CaIrO$$_3$$ has been proposed to originate mainly from the spin-orbit coupled $$J_{rm eff}=1/2$$ states. In pyrochlore iridates $$R_2$$Ir$$_2$$O$$_7$$ ($$R$$: rare earth), some exotic electronic states are theoretically proposed by assuming $$J_{rm eff}=1/2$$ states. However, the octahedral coordination around Ir is trigonally distorted, which may affect the energy level scheme of Ir $$5d$$ states. Here, we report spectra of resonant elastic and inelastic X-ray scattering in Eu$$_2$$Ir$$_2$$O$$_7$$ at the Ir $$L$$ edges. A large suppression of the magnetic scattering signal at the Ir $$L_{rm II}$$ edge supports the $$J_{rm eff}=1/2$$ picture rather than the $$S=1/2$$ one. The inelastic scattering spectrum indicates that the magnitude of the trigonal field on the Ir$$^{4+}$$ states is evaluated to be comparable to the spin-orbit interaction. The energy diagram of the $$5d$$ state is proposed based on the simple cluster model.

論文

ステンレス鋼の耐発銹性に及ぼす不働態皮膜の安定度の影響

富士 浩行*; 青木 聡; 石井 知洋*; 酒井 潤一*

材料と環境, 64(5), p.178 - 182, 2015/05

本研究は発銹の前駆過程である不働態皮膜の破壊に着目し、耐発銹性に及ぼす不働態皮膜の安定度の影響を明らかにすることを目的とした。12ヶ月間大気曝露試験を行った。不働態皮膜の安定度を比較するために、酸性塩化物水溶液中において電位衰退曲線測定および定電位分極試験を行った。その結果、オーステナイトステンレス鋼はフェライトステンレス鋼と比較して高い発銹面積率を示した。この序列は鋼種間の孔食電位や表面に存在する介在物の密度の序列と一致しなかった。それに対して、ステンレス鋼の耐発銹性と不働態皮膜の安定度の序列は一致した。オーステナイトステンレス鋼の耐発銹性がフェライトステンレス鋼よりも劣る要因として、不働態皮膜が塩化物によって破壊されやすく、不働態皮膜の破壊に伴い形成されたミクロピットが発銹の起点となり、発銹部の密度を高めていることが考えられる。

論文

Towards optimizing the performance of self-regenerating Pt-based perovskite catalysts

Jarrige, I.*; 石井 賢司; 松村 大樹; 西畑 保雄; 吉田 雅洋*; 岸 浩史*; 谷口 昌司*; 上西 真里*; 田中 裕久*; 笠井 秀明*; et al.

ACS Catalysis, 5(2), p.1112 - 1118, 2015/02

 被引用回数:12 パーセンタイル:60.96(Chemistry, Physical)

Self-regenerating automotive catalysts owe their remarkable performance to the repeated motion of the precious metal atoms in and out of the perovskite lattice under fluctuating oxidizing and reducing conditions, preventing coalescence of the metal nanoparticles. Here we use resonant inelastic X-ray scattering to characterize the occupied and unoccupied Pt 5d states in two self-regenerating Pt-perovskite catalysts, CaTi$$_{0.95}$$Pt$$_{0.05}$$O$$_3$$ and CaZr$$_{0.95}$$Pt$$_{0.05}$$O$$_3$$. Upon reduction, the element and symmetry-specific charge excitation spectra reveal a sizeable hybridization between the Pt 5d and the Ti 3d or Zr 4d states at the interface between the nanoparticles and the perovskite, which involves the occupied states and is thus invisible in X-ray absorption spectra. A correlation is found between the strength of this d-band hybridization and the proportion of Pt nanoparticles that remain buried below the surface during reduction, indicating that the motion of the Pt atoms towards the surface is hindered by this hybridization specifically, rather than by the Pt-O bonding. These results provide direct evidence that the strength of the metal-metal d-band hybridization plays a pivotal role in determining the efficiency of self-regeneration in perovskite catalysts.

論文

銀媒体電解酸化法と超音波攪拌を組み合わせた有機物の分解技術

小林 冬実; 石井 淳一; 白橋 浩一; 梅田 幹; 桜庭 耕一

攪拌・混合技術とトラブル対策, p.341 - 344, 2014/10

核燃料再処理工程で発生する超ウラン元素(TRU)で汚染した有機廃液を分解・無機化することを目的として、超音波攪拌を組み合わせた銀媒体電解酸化法による有機物の分解試験を実施した。本法は低温・常圧下において2価の銀イオン(Ag$$^{2+}$$)の酸化力により有機物を分解する方法であり、超音波を併用することで、溶液の攪拌とともに有機物分解の促進効果が期待できるため、有機廃液を効率的に処理することができる。本法を用いて30%リン酸トリブチル(TBP)/ノルマルドデカン($$n$$-DD)を対象に、電解電流、電解液温度、硝酸濃度及び超音波出力について分解基礎試験を実施し、今回の試験範囲における最適な分解条件を示した。また、選定した最適条件においてケロシン及びN,N,N',N'-テトラオクチル-3-オキサペンタン-1,5-ジアミド(TODGA)の分解試験を実施し、これらの有機物に対しても本法が有効であることを確認した。

論文

Spin-orbit coupling induced semi-metallic state in the 1/3 hole-doped hyper-kagome Na$$_3$$Ir$$_3$$O$$_8$$

高山 知弘*; Yaresko, A.*; 松本 章代*; Nuss, J.*; 石井 賢司; 吉田 雅洋*; 水木 純一郎; 高木 英典*

Scientific Reports (Internet), 4, p.6818_1 - 6818_6, 2014/10

 被引用回数:26 パーセンタイル:16.18(Multidisciplinary Sciences)

The complex iridium oxide Na$$_3$$Ir$$_3$$O$$_8$$ with a B-site ordered spinel structure was synthesized in single crystalline form, where the chiral hyper-kagome lattice of Irions, as observed in the spin-liquid candidate Na$$_4$$Ir$$_3$$O$$_8$$, was identified. The average valence of Ir is 4.33+ and, therefore, Na$$_3$$Ir$$_3$$O$$_8$$ can be viewed as a doped analogue of the hyper-kagome spin liquid with Ir$$^{4+}$$. The transport measurements, combined with the electronic structure calculations, indicate that the ground state of Na$$_3$$Ir$$_3$$O$$_8$$ is a low carrier density semi-metal. We argue that the semi-metallic state is produced by a competition of the molecular orbital splitting of $$t_{2g}$$ orbitals on Ir$$_3$$ triangles with strong spin-orbit coupling inherent to heavy Ir ions.

論文

Superconductivity in noncentrosymmetric iridium silicide Li$$_2$$IrSi$$_3$$

Pyon, S.*; 工藤 一貴*; 松村 純一*; 石井 博文*; 松尾 元太*; 野原 実*; 北條 元*; 岡 研吾*; 東 正樹*; Garlea, V. O.*; et al.

Journal of the Physical Society of Japan, 83(9), p.093706_1 - 093706_5, 2014/09

 被引用回数:21 パーセンタイル:21.65(Physics, Multidisciplinary)

The effects of lithium absorption on the crystal structure and electronic properties of IrSi$$_3$$, a binary silicide with a noncentrosymmetric crystal structure, were studied. X-ray and neutron diffraction experiments revealed that hexagonal IrSi$$_3$$ (space group $$P6_3mc$$) transforms into trigonal Li$$_2$$IrSi$$_3$$ (space group $$P31c$$) upon lithium absorption. The structure of Li$$_2$$IrSi$$_3$$ is found to consist of a planar kagome network of silicon atoms with Li and Ir spaced at unequal distances between the kagome layers, resulting in a polar structure along the c-axis. Li$$_2$$IrSi$$_3$$ exhibited type-II superconductivity with a transition temperature $$T_{rm c}$$ of 3.8 K, displaying a structure type that no previous superconductors have been reported to have.

論文

High-energy spin and charge excitations in electron-doped copper oxide superconductors

石井 賢司; 藤田 全基*; 佐々木 隆了*; Minola, M.*; Dellea, G.*; Mazzoli, C.*; Kummer, K.*; Ghiringhelli, G.*; Braicovich, L.*; 遠山 貴己*; et al.

Nature Communications (Internet), 5, p.3714_1 - 3714_8, 2014/04

 被引用回数:65 パーセンタイル:5.19(Multidisciplinary Sciences)

We combine X-ray and neutron inelastic scattering measurements to track the doping dependence of both spin and charge excitations in electron-doped materials. Copper $$L_3$$ resonant inelastic X-ray scattering spectra show that magnetic excitations shift to higher energy upon doping. Their dispersion becomes steeper near the magnetic zone center and they deeply mix with charge excitations, indicating that electrons acquire a highly itinerant character in the doped metallic state. Moreover, above the magnetic excitations, an additional dispersing feature is observed near the $$Gamma$$-point, and we ascribe it to particle-hole charge excitations. These properties are in stark contrast with the more localized spin-excitations (paramagnons) recently observed in hole-doped compounds even at high doping-levels.

論文

Bipartite magnetic parent phases in the iron oxypnictide superconductor

平石 雅俊*; 飯村 壮史*; 小嶋 健児*; 山浦 淳一*; 平賀 晴弘*; 池田 一貴*; Miao, P.*; 石川 喜久*; 鳥居 周輝*; 宮崎 正範*; et al.

Nature Physics, 10(4), p.300 - 303, 2014/04

 被引用回数:83 パーセンタイル:3.75(Physics, Multidisciplinary)

High-temperature (high-$$T_{rm c}$$) superconductivity appears as a consequence of the carrier-doping of an undoped parent compound exhibiting antiferromagnetic order; thereby, ground-state properties of the parent compound are closely relevant to the superconducting state. On the basis of the concept, a spin-fluctuation has been addressed as an origin of pairing of the superconducting electrons in cuprates. Whereas, there is growing interest in the pairing mechanism such as an unconventional spin-fluctuation or an advanced orbital-fluctuation due to the characteristic multi-orbital system in iron-pnictides. Here, we report the discovery of an antiferromagnetic order as well as a unique structural transition in electron-overdoped LaFeAsO$$_{1-x}$$H$$_x$$ ($$x sim 0.5$$), whereby another parent phase was uncovered, albeit heavily doped. The unprecedented two-dome superconducting phases observed in this material can be interpreted as a consequence of the carrier-doping starting from the original at $$x sim 0$$ and advanced at $$x sim 0.5$$ parent phases toward the intermediate region. The bipartite parent phases with distinct physical properties in the second magnetic phase provide us with an interesting example to illustrate the intimate interplay among the magnetic interaction, structural change and orbital degree of freedom in iron-pnictides.

論文

Momentum-resolved resonant inelastic X-ray scattering on a single crystal under high pressure

吉田 雅洋*; 石井 賢司; Jarrige, I.*; 綿貫 徹; 工藤 一貴*; 小池 洋二*; 熊谷 健一*; 平岡 望*; 石井 啓文*; Tsuei, K.-D.*; et al.

Journal of Synchrotron Radiation, 21(1), p.131 - 135, 2014/01

 被引用回数:3 パーセンタイル:76.22(Instruments & Instrumentation)

A single-crystal momentum-resolved resonant inelastic X-ray scattering (RIXS) experiment under high pressure using an originally designed diamond anvil cell (DAC) is reported. The diamond-in/diamond-out geometry was adopted with both the incident and scattered beams passing through a 1 mm-thick diamond. This enabled us to cover wide momentum space keeping the scattering angle condition near 90$$^{circ}$$. Elastic and inelastic scattering from the diamond was drastically reduced using a pinhole placed after the DAC. Measurement of the momentum-resolved RIXS spectra of Sr$$_{2.5}$$Ca$$_{11.5}$$Cu$$_{24}$$O$$_{41}$$ at the Cu $$K$$-edge was thus successful. Though the inelastic intensity becomes weaker by two orders than the ambient pressure, RIXS spectra both at the center and the edge of the Brillouin zone were obtained at 3 GPa and low-energy electronic excitations of the cuprate were found to change with pressure.

論文

Instrumental upgrades of the RIXS spectrometer at BL11XU at SPring-8

石井 賢司; Jarrige, I.*; 吉田 雅洋*; 池内 和彦*; 稲見 俊哉; 村上 洋一*; 水木 純一郎

Journal of Electron Spectroscopy and Related Phenomena, 188, p.127 - 132, 2013/06

 被引用回数:10 パーセンタイル:41.25(Spectroscopy)

Two recent instrumental upgrades of the inelastic X-ray scattering spectrometer installed at BL11XU at SPring-8 are reported. The first one is a multianalyzer system, where we can simultaneously use three crystal analyzers aligned perpendicularly to the scattering plane. In a test measurement of polycrystalline $$alpha$$-PtO$$_2$$, the inelastic spectra obtained with each respective analyzer showed a completely identical lineshape, and a slight difference ($$le$$ 10%) in intensity. The system enhances the experimental efficiency, and allows for simultaneous scan at three momenta for a single-crystal sample. The second development is a polarization analyzer for the scattered photons. A pyrolytic graphite (PG) crystal is placed in front of the detector and serves as a polarization-analyzer crystal, using the (006) reflection for the Cu $$K$$-edge. We succeeded to observe clear polarization dependence in the $$d$$-$$d$$ excitations of KCuF$$_3$$.

論文

Resonant inelastic X-ray scattering study of intraband charge excitations in hole-doped high-$$T_c$$ cuprates

脇本 秀一; 石井 賢司; 木村 宏之*; 池内 和彦*; 吉田 雅洋*; 足立 匡*; Casa, D.*; 藤田 全基*; 福永 靖*; Gog, T.*; et al.

Physical Review B, 87(10), p.104511_1 - 104511_7, 2013/03

 被引用回数:8 パーセンタイル:56.43(Materials Science, Multidisciplinary)

We have performed resonant inelastic X-ray scattering (RIXS) near the Cu-$$K$$ edge on various cuprate superconductors, covering underdoped to heavily overdoped regimes and focusing on charge excitations inside the charge-transfer gap. RIXS measurements with $$E_i$$= 9.003 keV on metallic La$$_{1.7}$$Sr$$_{0.3}$$CuO$$_{4}$$ and Bi$$_{1.76}$$Pb$$_{0.35}$$Sr$$_{1.89}$$CuO$$_{6+delta}$$ exhibit a dispersive intraband excitation below 4 eV, similar to that observed in the electron-doped Nd$$_{1.85}$$Ce$$_{0.15}$$CuO$$_{4}$$. This is the first observation of a dispersive intraband excitation in a hole-doped system, evidencing that both electron- and hole-doped systems have a similar dynamical charge correlation function.

報告書

定常臨界実験装置(STACY)及び過渡臨界実験装置(TRACY)の燃料調製施設の運転記録; 平成16$$sim$$20年度

石仙 順也; 住谷 正人; 関 真和; 小林 冬実; 石井 淳一; 梅田 幹

JAEA-Technology 2012-041, 32 Pages, 2013/02

JAEA-Technology-2012-041.pdf:1.6MB

定常臨界実験装置(STACY)及び過渡臨界実験装置(TRACY)の燃料調製施設においては、臨界実験で使用する硝酸ウラニル溶液を準備するため、実験目的に応じてウラン濃度,硝酸濃度,可溶性中性子毒物濃度等の調整を行っている。平成16年度から平成20年度にかけては、STACY及びTRACYで使用する燃料の調整のため、硝酸ウラニル溶液のU濃縮缶による濃縮及び脱硝を行った。並行して、平成17年度及び平成18年度には、核分裂生成物等の中性子吸収効果を定量するためのSTACY実験のために、可溶性中性子毒物を添加した溶液燃料の調整を行った。この実験が終了した後、平成18年度及び平成19年度にかけて可溶性中性子毒物添加燃料の一部について、ミキサセトラを用いた溶媒抽出法により、中性子毒物の除去を行った。本報告書は、これらの平成16年度から平成20年度に実施した燃料調製施設の運転データについてまとめたものである。

論文

Inelastic X-ray scattering studies of electronic excitations

石井 賢司; 遠山 貴己*; 水木 純一郎

Journal of the Physical Society of Japan, 82(2), p.021015_1 - 021015_24, 2013/02

 被引用回数:20 パーセンタイル:23.32(Physics, Multidisciplinary)

Inelastic X-ray Scattering (IXS) has developed as one of the most powerful momentum-resolved spectroscopies. Especially in the last decade, it achieved significant progress by utilizing brilliant X-rays from third generation synchrotron radiation facilities. Simultaneously, theoretical efforts have been made to predict or interpret the experimental spectra. One of the scientific fields studied intensively by means of IXS is strongly correlated electron systems, where the interplay of charge, spin, and orbital degrees of freedom determines their physical properties. IXS can provide a new insight into electron dynamics of the systems through the observation of charge, spin, and orbital excitations. Focusing on the momentum-resolved electronic excitations in strongly correlated electron systems, we review IXS studies and present capabilities of IXS for the study of dynamics of materials.

論文

Electroplating of Ni microstructures on the cross section of Cu wire using PMMA mother fabricated by proton beam writing

田邊 祐介*; 岩本 隆志*; 高橋 潤一*; 西川 宏之*; 佐藤 隆博; 石井 保行; 神谷 富裕

JAEA-Review 2012-046, JAEA Takasaki Annual Report 2011, P. 129, 2013/01

In this study, the Ni microstructures were attempted to be fabricated on a distal surface of Cu wires with a diameter of 1.0 mm aiming at the use for imprint lithography. Firstly a PMMA master block was fabricated on the distal surface by exposing PB with beam size of 1.1 $$mu$$m at 3.0 MeV and developing it by IPA-water for electroplating. The master block was composed of the 4-$$mu$$m wide lines with pitches of 25 $$mu$$m and depths of 20 $$mu$$m. Secondly the electroplating was performed on the PMMA master block using a nickel sulfamate bath. Thirdly the electroplated Ni surface was mechanically polished easily to remove PMMA by smoothing its surface. Finally, the Ni microstructures with 20.5 $$mu$$m were fabricated by removing the PMMA after polishing. We additionally performed UV imprint lithography of the photosensitive polymer using the Ni microstructures as a mold. The observation result of SEM images of Ni microstructures and UV imprinted grooves showed that their imprinted grooves were successfully transferred by way of the Ni microstructures from the PMMA master block using the combination of the electroplating and imprinting.

報告書

概要調査段階における設計・性能評価手法の高度化; NUMO-JAEA共同研究報告書(2011年度)(共同研究)

柴田 雅博; 澤田 淳; 舘 幸男; 牧野 仁史; 早野 明; 三ツ井 誠一郎; 谷口 直樹; 小田 治恵; 北村 暁; 大澤 英昭; et al.

JAEA-Research 2012-032, 298 Pages, 2012/09

JAEA-Research-2012-032.pdf:33.68MB

原子力機構(JAEA)と原子力発電環境整備機構(NUMO)は、概要調査段階における処分場の設計・性能評価に関連する主要な技術テーマについて、原子力機構が蓄積してきた技術やノウハウを、NUMOが今後の処分事業に適用できるよう、実施主体の視点に沿って実用化を図っていくための具体的な考え方と進め方を策定するとともに、必要な開発課題と今後の計画を明らかにすることを目的として、2011年度に共同研究を実施した。実施テーマと概要は以下の通り。(1)対象母岩の選定に関する検討:母岩特性のうち水理に着目し、母岩特性を評価するための項目、及び地下水移行時間の評価手法について、地質環境の調査・評価と関連付けたうえで整理した。(2)シナリオの構築に関する検討:シナリオ構築手順を具体化するとともに、ガラス固化体の溶解と核種の浸出、オーバーパックの腐食、緩衝材の長期変遷について、現象理解に関する最新の知見を構造的に整理した。(3)核種移行パラメータの設定に関する検討:緩衝材の分配係数と拡散係数、母岩の分配係数を対象として、パラメータ設定の方法論を検討し、その方法論に従った試行を行った。(4)知識情報の品質確保に関する検討:知識情報の品質を確保するための考え方や手法を、(2)シナリオの構築で検討した状態設定に対する論拠に関する情報を例として検討した。

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