Oral presentation

[2C01-05] Waste

Thu. Sep 8, 2022 9:30 AM - 10:55 AM Room C (E1 Bildg.2F No.22)

Chair:Masaaki Yamaguchi(JAEA)

9:30 AM - 9:45 AM

[2C01] Stakeholder Involvement for Geological Disposal of High-Level Radioactive Waste

Comparison of stakeholder involvement for disposal site selection in Japan with IAEA guidance

*Shin Horiguchi¹, Shinichi Nakayama¹, Kenta Murakami¹ (1. UTokyo)

9:45 AM - 10:00 AM

[2C02] Development of Reuse Technology for Radioactive Waste Containers Using CW Fiber Laser Irradiation Method

*Shoya Suda¹, Seita Masai¹, Takahiro Kawahara¹, Toshiki Fujikura¹, Akiko Hoshi¹, Eiichi Wakai¹, Keietsu Kondo¹, Akihiko Nishimura¹, Eisuke John Minehara² (1. JAEA, 2. LDD Corporation)

10:00 AM - 10:15 AM

[2C03] Synthesis and analysis of (U,Zr)O₂ solid solutions having different crystal structures

*Daisuke Akiyama¹, Hiroki Nakazumi¹, Yoshihiro Okamoto², Mitsuo Nomura², Motoyuki Ikeda³, Akira Kirishima¹ (1. Tohoku Univ., 2. JAEA, 3. Inspection Development)

10:15 AM - 10:30 AM

[2C04] Optimization Methodology for Facility Design of Radioactive Waste Disposal Using Probabilistic Approach

A Measure to Improve the Optimization Methodology Involving the Change in Dose over Time

*Shingo Tanaka¹, Ryo Nakabayashi¹, Kazuma Kuroda¹, Daisuke Sugiyama¹ (1. CRIEPI)

10:30 AM - 10:45 AM

[2C05] Trial calculation of Radioactivity Concentration Corresponding to Dose Criterion for concrete vault disposal of radioactive waste generated from research, medical, and industrial facilities

*Kota Sakuma¹, Toshikatsu Sugaya¹, Daichi Abe², Akihiro Sakai¹ (1. JAEA, 2. Inspection Development)

Time reserved for Chair （10:45 AM - 10:55 AM）

Oral presentation

[2C06-09] TRU Waste

Thu. Sep 8, 2022 10:55 AM - 12:00 PM Room C (E1 Bildg.2F No.22)

Chair:Daisuke Akiyama(Tohoku Univ.)

10:55 AM - 11:10 AM

[2C06] Research and development of TRU waste package

(1)Overview

*Naoki Fujii¹, Hitoshi Owada¹, Noriyuki Maruyama¹, Hiroyuki Sakamoto¹, Hiroshi Sekiguchi¹ (1. RWMC)

11:10 AM - 11:25 AM

[2C07] Research and development of TRU waste package

(2) Evaluation of Radiolysis Hydrogen Generation from Waste Package Infill

*Hiroyuki Sakamoto¹, Kumi Negishi², Masaya Ida², Shinya Hasegawa², Naoki Fujii¹, Hitoshi Owada¹ (1. RWMC, 2. Taiheiyo Consultant)

11:25 AM - 11:40 AM

[2C08] Research and development of TRU waste package

(3)Effect of state of the water in cement-based materials on hydrogen gas generation

*kumi Negishi¹, Masaya Ida¹, Shinya Hasegawa¹, Hiroyuki Sakamoto², Naoki Fujii², Hitoshi Owada² (1. Taiheiyo Consultant, 2. RWMC)

11:40 AM - 11:55 AM

[2C09] Research and development of TRU waste package

(4) Study on Radiolytic Hydrogen Generation from Concrete

*Masaya Ida¹, Kumi Negishi¹, Shinya Hasegawa¹, Hiroyuki Sakamoto², Naoki Fujii², Hitoshi Owada² (1. Taiheiyo Consultant, 2. RWMC)

Time reserved for Chair （11:55 AM - 12:00 PM）

Oral presentation

[2C10-14] Migration/Sorption1

Thu. Sep 8, 2022 2:45 PM - 4:10 PM Room C (E1 Bildg.2F No.22)

Chair:Shingo Tanaka(CRIEPI)

2:45 PM - 3:00 PM

[2C10] Sorption Behaviors for Selenate and Selenite Ions onto Calcium Silicate Hydrate

*Tsugumi Seki¹, Kazuki Maeta¹, Taiji Chida¹, Yuichi Niibori¹ (1. Tohoku Univ.)

3:00 PM - 3:15 PM

[2C11] Migration behavior of molybdate ion in bentonite

*Yuya Nakasaki¹, Kazuya Idemitsu¹, Yaohiro Inagaki¹, Tatsumi Arima¹ (1. Kyushu Univ.)

3:15 PM - 3:30 PM

[2C12] Solubility of Niobium under high Calcium concentration and alkaline conditions

*Saki Ohira¹, Takeyasu Abe¹, Yoshihisa Iida¹ (1. Japan Atomic Energy Ergency)

3:30 PM - 3:45 PM

[2C13] Evaluation of the Sorption Behavior of Europium onto Calcium-silicate-hydrate with Magnesium under the Condition Saturated with Saline Groundwater

*Ryo Tahara¹, Tsugumi Seki¹, Taiji Chida¹, Yuichi Niibori¹ (1. Tohoku Univ.)

3:45 PM - 4:00 PM

[2C14] Sorption of Zr and Np(IV) on montmorillonite in the presence of carbonate

*Takamitsu Ishidera¹, Takafumi Hamamoto², Mitsuhiro Okazaki³, Yoshihide Yamada³, Tsutomu Tomura³ (1. JAEA, 2. NUMO, 3. Inspection Development)

Time reserved for Chair （4:00 PM - 4:10 PM）

Oral presentation

[2C15-20] Migration/Sorption2

Thu. Sep 8, 2022 4:10 PM - 5:50 PM Room C (E1 Bildg.2F No.22)

Chair:Takamitsu Ishidera(JAEA)

4:10 PM - 4:25 PM

[2C15] Study for improvement in reliability of performance assessment of vitrified waste in geological disposal

(1) Overview

*Ryuta Matsubara¹, Keisuke Ishida¹, Kiyoshi Fujisaki¹, Katsuhiko Ishiguro¹, Yaohiro Inagaki², Takahiro Ohkubo³, Hajime Iwata⁴ (1. NUMO, 2. Kyusyu University, 3. Chiba University, 4. JAEA)

4:25 PM - 4:40 PM

[2C16] Study for improvement in reliability of performance assessment of vitrified waste in geological disposal

(2) Evaluation of dissolution rate for simulated waste glass P0798 : Effect of solution concentration of Si and pH

*Ritsuki Egami¹, Yaohiro Inagaki¹, Noriyuki Yokoyama¹, Toshihiro Kimachi¹, Tatsumi Arima¹, Kazuya Idemitsu¹, Ryuta Matsubara² (1. Kyushu Univ., 2. NUMO)

4:40 PM - 4:55 PM

[2C17] Study for improvement in reliability of performance assessment of vitrified waste in geological disposal

(3)Elucidating the atomic structures of the gel layer formed during aluminoborosilicate glass dissolution: an integrated experimental and simulation study

*Takahro Ohkubo¹, Ryuta Matsubara² (1. Chiba university, 2. NUMO)

4:55 PM - 5:10 PM

[2C18] Leaching behavior of radionuclides from irradiated endpiece under geological repository condition

(3)Measurement of a radioactive concentration distribution using imaging plate

*Yuki Nakai¹, Naoto Kume¹, Shuji Yamamoto¹, Yu Yamashita¹, Tomofumi Sakuragi², Hiroyoshi Ueda² (1. TOSHIBA ESS, 2. RWMC)

5:10 PM - 5:25 PM

[2C19] Hydration state of Eu adsorbed in small pores

*Kento Murota^1,2, Noboru Aoyagi³, Huiyang Mei³, Takumi Saito¹ (1. UTokyo, 2. NRA, 3. JAEA)

5:25 PM - 5:40 PM

[2C20] Molecular dynamics study of cation migration pathways on the outer surface space in smectite-water system.

*Naoki Matsui¹, Takahiro Ohkubo¹, Yukio Tachi², Kenji Yotsuji², Yuki Sugiura² (1. Chiba Univ., 2. JAEA)

Time reserved for Chair （5:40 PM - 5:50 PM）

Oral presentation

[3C01-05] Simulation

Fri. Sep 9, 2022 9:45 AM - 11:10 AM Room C (E1 Bildg.2F No.22)

Chair:Takeyasu Abe(JAEA)

9:45 AM - 10:00 AM

[3C01] A Study on Behavior of Buffer Material into a Neighboring Rock Fracture Considered Density Distribution Change in Buffer Material Based on Particle Diffusion Model

*Kengo Yamanaka¹ (1. Okayama Univ.)

10:00 AM - 10:15 AM

[3C02] Effects of Groundwater Flow and Saltwater Intrusion under Coastal Seabed Sediment on Radionuclide Releases Rate from a HLW Disposal

*Koraphat Fairat¹, Takumi Saito¹, Kanako Toda¹ (1. UTokyo)

10:15 AM - 10:30 AM

[3C03] Analyses of Coupled Thermo-Hydro-Mechanical (T-H-M) Processes in Buffer Material

*Daiko Okajima¹, Haruo Sato¹ (1. Okayama University)

10:30 AM - 10:45 AM

[3C04] Development of methodologies for validation of groundwater flow and mass transport model

(1)A case study using investigation data obtained at the Äspö Hard Rock Laboratory

*HIRONORI ONOE¹, HIROMITSU SAEGUSA¹, TATSUYA TANAKA², KEISUKE ISHIDA¹, KIYOSHI FUJISAKI¹, ATSUSHI SAWADA³ (1. NUMO, 2. OBAYASHI, 3. JAEA)

10:45 AM - 11:00 AM

[3C05] Development of methodologies for validation of groundwater flow and mass transport model

(2)A case study using investigation data obtained at the Mizunami Underground Research Laboratory

*Koji Hane¹, Hironori Onoe², Masayuki Ishibashi¹, Kazuto Tabei¹, Tadashi Namikawa¹, Youichi Tagawa¹, Hiromitsu Saegusa², Keisuke Ishida², Kiyoshi Fujisaki², Atsushi Sawada³ (1. KAJIMA, 2. NUMO, 3. JAEA)

Time reserved for Chair （11:00 AM - 11:10 AM）

Oral presentation

[3C06-08] Geological Environment

Fri. Sep 9, 2022 11:10 AM - 12:00 PM Room C (E1 Bildg.2F No.22)

Chair:Haruo Sato(Okayama Univ.)

11:10 AM - 11:25 AM

[3C06] Development of the Topography and repository depth transition analysis tool for coastal areas (TARTAN-II)

*Masaaki Yamaguchi¹, Tomoko Kato¹, Suzuki Yuji², Satsuki Kabasawa¹, Mihara Morihiro¹, Hitoshi Makino¹ (1. JAEA, 2. NESI)

11:25 AM - 11:40 AM

[3C07] Study on an evaluation technology related to the occurrence of volcanic and igneous activities

Efforts to advance technology to understand the range of influence of magma

*Makoto Kawamura¹, Nariaki Nishiyama¹, Masakazu Niwa¹, Koji Umeda² (1. JAEA, 2. Hirosaki Univ.)

11:40 AM - 11:55 AM

[3C08] Study on confirmation of borehole closure for intermediate disposal of radioactive waste

*Takuma Sawaguchi¹, Hiroaki Murakami¹, Ryuji Takeuchi¹, Shizuka Takai¹, Tsuyoshi Sasagawa¹, Seiji Takeda¹ (1. JAEA)

Time reserved for Chair （11:55 AM - 12:00 PM）

Oral presentation

[3C09-14] Material

Fri. Sep 9, 2022 2:45 PM - 4:25 PM Room C (E1 Bildg.2F No.22)

Chair:HIRONORI ONOE(NUMO)

2:45 PM - 3:00 PM

[3C09] Numerical analysis of geochemical degradation of concrete during groundwater infiltration: Effect of redox-oxidation condition

*Takeyasu Abe¹, Yoshihisa Iida¹ (1. JAEA)

3:00 PM - 3:15 PM

[3C10] Radiolysis hydrogen yields of cement constituent crystals

Effect of irradiation temperature on the G_H2

*Jun Kumagai¹, Keisuke Hosomi², Shinya Hasegawa³, Kumi Negishi³, Masaya Ida³ (1. IMaSS, Nagoya Univ., 2. Faculty of Engineering, Nagoya Univ., 3. Taiheiyo Consultant)

3:15 PM - 3:30 PM

[3C11] Experiments of bentonite spraying method for the clay plug

(2) Bentonite spraying to an excavated slot at the Horonobe URL

*Shun Kimura¹, Masaki Takeda¹, Takayuki Motoshima², Hanae Dan² (1. JAEA, 2. TAISEI)

3:30 PM - 3:45 PM

[3C12] Measurements of Thermodynamic Data of Water in Na-Bentonite in the Pressure Release System and Saturated Condition by Relative Humidity Method

*Haruo Sato¹ (1. Okayama University)

3:45 PM - 4:00 PM

[3C13] Quantification of changes in physical and chemical characteristics of concrete support in Horonobe Underground Research Laboratory

(1)Overview and initial condition of test specimens

*Akihito Mochizuki¹, Matsui Hiroya¹, Yusuke Ozaki¹, Takayuki Motoshima², Mayumi Jo², Masahito Shibata³, Kumi Negishi³, Ryo Sakamoto³ (1. JAEA, 2. TAISEI, 3. Taiheiyo Consultant)

4:00 PM - 4:15 PM

[3C14] Quantification of changes in physical and chemical characteristics of concrete support in Horonobe Underground Research Laboratory

(2)Evaluation of change of specimens put in various environments with time

*masahito shibata¹, Kumi Negishi¹, Ryo Sakamoto¹, Hiroya Matsui², Akihito Mochizuki², Yusuke Ozaki² (1. Taiheiyo Consultant, 2. Japan Atomic Energy Agency)

Time reserved for Chair （4:15 PM - 4:25 PM）

Sessions

V. Nuclear Fuel Cycle and Nuclear Materials » 505-2 Waste Disposal and Its Environmental Aspects

[2C01-05] Waste

Comparison of stakeholder involvement for disposal site selection in Japan with IAEA guidance

A Measure to Improve the Optimization Methodology Involving the Change in Dose over Time

[2C06-09] TRU Waste

(1)Overview

(2) Evaluation of Radiolysis Hydrogen Generation from Waste Package Infill

(3)Effect of state of the water in cement-based materials on hydrogen gas generation

(4) Study on Radiolytic Hydrogen Generation from Concrete

[2C10-14] Migration/Sorption1

[2C15-20] Migration/Sorption2

(1) Overview

(2) Evaluation of dissolution rate for simulated waste glass P0798 : Effect of solution concentration of Si and pH

(3)Elucidating the atomic structures of the gel layer formed during aluminoborosilicate glass dissolution: an integrated experimental and simulation study

(3)Measurement of a radioactive concentration distribution using imaging plate

[3C01-05] Simulation

(1)A case study using investigation data obtained at the Äspö Hard Rock Laboratory

(2)A case study using investigation data obtained at the Mizunami Underground Research Laboratory

[3C06-08] Geological Environment

Efforts to advance technology to understand the range of influence of magma

[3C09-14] Material

Effect of irradiation temperature on the GH2

(2) Bentonite spraying to an excavated slot at the Horonobe URL

(1)Overview and initial condition of test specimens

(2)Evaluation of change of specimens put in various environments with time

Authentication

Effect of irradiation temperature on the G_H2