Oral presentation

[1F01-03] Decommissioning of Reprocessing Facility

Wed. Sep 6, 2023 10:00 AM - 10:50 AM Room F (Okuma Machine Tool Eng. Bildg. 2F Lecture Room)

Chair:Shun Kanagawa(CRIEPI)

10:00 AM - 10:15 AM

[1F01] Study of recovery waste from the High Active Solid Waste Storage (HASWS) at Tokai Reprocessing Plant

(1) Outline of study on HASWS and retrieval equipment

*Satoshi Ito¹, Kyohei Sano¹, Yuito Tameta¹, Kazuki Akiyama¹ (1. JAEA)

10:15 AM - 10:30 AM

[1F02] Study of recovery waste from High Active Solid Waste Storage (HASWS) at Tokai Reprocessing Plant

(2) Study of underwater ROV

*Kyohei Sano¹, Yuito Tameta¹, Satoshi Ito¹, Kazuki Akiyama¹ (1. JAEA)

10:30 AM - 10:45 AM

[1F03] Study of recovery waste from High Active Solid Waste Storage (HASWS) at Tokai Reprocessing Plant

(3) Study of underwater buoyancy

*Yuito Tameta¹, Kyohei Sano¹, Satoshi Ito¹, Kazuki Akiyama¹ (1. JAEA)

Time reserved for Chair （10:45 AM - 10:50 AM）

Oral presentation

[1F04-07] Fuel Debris 1

Wed. Sep 6, 2023 10:50 AM - 11:55 AM Room F (Okuma Machine Tool Eng. Bildg. 2F Lecture Room)

Chair:Kinya Nakamura(CRIEPI)

10:50 AM - 11:05 AM

[1F04] Development of investigation instrument of nuclear fuel debris inside sediment

(1)Development of detection instrument of nuclear fuel debris inside sediment

*Katsunori Ueno¹, Yuichiro Ueno¹, Koichi Okada¹, Yosuke Takatori², Satoshi Okada², Yutaka Kometani² (1. Hitachi, RDG, 2. Hitachi GE Nuclear Energy)

11:05 AM - 11:20 AM

[1F05] Development of investigation instrument of nuclear fuel debris inside sediment

(2) Results of detection of nuclear fuel debris inside sediment in the primary containment vessel of unit 1

*Yuichiro Ueno¹, Katsunori Ueno¹, Koichi Okada¹, Yutaka Kometani², Yosuke Takatori², Satoshi Okada² (1. Hitachi, 2. HGNE)

11:20 AM - 11:35 AM

[1F06] Criticality control technique development for Fukushima Daiichi fuel debris

(56) Study on scale effect the drying behavior of fuel debris covered with water glass based neutron absorber

*Seiya Suzuki^1,2, Yoichi Arai^1,2, Masayuki Watanabe^1,2, Shohei Kawano^1,3, Yoshiyuki Kawaharada^1,3 (1. IRID, 2. JAEA, 3. TOSHIBA ESS)

11:35 AM - 11:50 AM

[1F07] A monitoring system of lasers for two-color resonance ionization

*Tamaki Matsumura¹, Shoki Yoshimura¹, Masato Morita¹, Tetsuo Sakamoto¹ (1. Kogakuin University)

Time reserved for Chair （11:50 AM - 11:55 AM）

Oral presentation

[1F08-13] Fuel Debris 2

Wed. Sep 6, 2023 2:45 PM - 4:20 PM Room F (Okuma Machine Tool Eng. Bildg. 2F Lecture Room)

Chair:Hideki Tomita(Nagoya Univ.)

2:45 PM - 3:00 PM

[1F08] Assessment of dust dispersion data for future safety analysis of Fukushima Daiichi fuel debris retrieval

(3) Development of precise measurement of dust dispersion behavior and methodology to derive airborne release fraction during cutting fuel debris

*TAIZO KANAI¹, Tadafumi Koyama¹, Kenta Inagaki¹, Koichi Uozumi¹, Kinya Nakamura¹, Shun Kanagawa¹, Tetsuya Kato¹, Daisuke Yamauchi², Kazutaka Mogi², Yuichi Iwata² (1. CRIEPI, 2. TEPCO HD)

3:00 PM - 3:15 PM

[1F09] Assessment of dust dispersion data for future safety analysis of Fukushima Daiichi fuel debris retrieval

(4) Measurement of dust dispersion data during cutting cold simulants with disk cutter

*yoshihiro kondo¹, Kei Higashi¹, Taiki Asahara¹, Kazuhiro Yoshida¹, Takeshi Yokoyama¹, Taizo Kanai², Koichi Uozumi², Kinya Nakamura², Shun Kanagawa², Kenta Inagaki² (1. MHI, 2. CRIEPI)

3:15 PM - 3:30 PM

[1F10] Assessment of dust dispersion data for future safety analysis of Fukushima Daiichi fuel debris retrieval

(5) Measurement of dust dispersion data during breaking cold simulants with chisel

*Muneyuki Nakada¹, Masafumi Noujima ², Fumio Totsuka¹, Koichi Uozumi³, Taizo Kanai³, Kinya Nakamura³, Shun Kanagawa³, Kenta Inagaki³, Tadafumi Koyama, Daisuke Yamauchi⁴ (1. HGNE, 2. Hitachi, 3. CRIEPI, 4. TEPCO HD)

3:30 PM - 3:45 PM

[1F11] Assessment of dust dispersion data for future safety analysis of Fukushima Daiichi fuel debris retrieval

(6) Measurement of dust dispersion data during cutting cold simulants with core boring

*Tomoe Takahashi¹, Keita Sano¹, Keiji Iwata¹, Koichi Uozumi², Taizo Kanai², Kinya Nakamura², Shun Kanagawa², Kenta Inagaki², Tadafumi Koyama², Daisuke Yamauchi³ (1. IHI, 2. CRIEPI, 3. TEPCO HD)

3:45 PM - 4:00 PM

[1F12] Assessment of dust dispersion data for future safety analysis of Fukushima Daiichi fuel debris retrieval

(7) Measurement of dust dispersion data during cutting cold simulants with laser

*Keita Sano¹, Tomoe Takahashi¹, Keiji Iwata¹, Koichi Uozumi², Taizo Kanai², Kinya Nakamura², Shun Kanagawa², Inagaki Kenta², Tadafumi Koyama², Daisuke Yamauchi³ (1. IHI, 2. CRIEPI, 3. TEPCO HD)

4:00 PM - 4:15 PM

[1F13] Assessment of dust dispersion data for future safety analysis of Fukushima Daiichi fuel debris retrieval

(8) Comparison of dust dispersion behaviors during cutting cold simulants with disk cutter, chisel, core boring and laser

*Koichi Uozumi¹, Taizo Kanai¹, Shun Kanagawa¹, Kinya Nakamura¹, Takatoshi Hijikata¹, Tetsuya Kato¹, Kenta Inagaki¹, Tadafumi Koyama¹, Muneyuki Nakada², Takeshi Yokoyama³ (1. CRIEPI, 2. HGNE, 3. MHI)

Time reserved for Chair （4:15 PM - 4:20 PM）

Oral presentation

[1F14-19] Fuel Debris 3

Wed. Sep 6, 2023 4:20 PM - 6:00 PM Room F (Okuma Machine Tool Eng. Bildg. 2F Lecture Room)

Chair:Tatsuya Suzuki(Nagaoka Univ. of Tech.)

4:20 PM - 4:35 PM

[1F14] Assessment of dust dispersion data for future safety analysis of Fukushima Daiichi fuel debris retrieval

(9) Measurement of dust dispersion data during cutting uranium oxide fuel debris with disk cutter

*Akihiro Suzuki¹, Yuji Kitsunai¹, Yoshiyuki Kawaharada², Hideki Nakamura², Masaki Yoda², Kinya Nakamura³, Taizo Kanai³, Koichi Uozumi³, Kenta Inagaki³, Tadafumi Koyama³ (1. NFD, 2. TOSHIBA ESS, 3. CRIEPI)

4:35 PM - 4:50 PM

[1F15] Assessment of dust dispersion data for future safety analysis of Fukushima Daiichi fuel debris retrieval

(10) Characterization of once-molten kg-scale fuel debris simulants containing uranium

*Kinya Nakamura Nakamura¹, Koichi Uozumi¹, Tadafumi Koyama¹, Taizo Kanai¹, Shun Kanagawa¹, Takatoshi Hijikata¹, Tetsuya Kato¹, Daisuke Yamauchi², Kazutaka Mogi², Yuichi Iwata² (1. CRIEPI, 2. TEPCO)

4:50 PM - 5:05 PM

[1F16] Assessment of dust dispersion data for future safety analysis of Fukushima Daiichi fuel debris retrieval

(11) Measurement of dust dispersion data during cutting kg-scale fuel debris simulants containing uranium with disk cutter

*Shun Kanagawa¹, Kinya Nakamura¹, Taizo Kanai¹, Koichi Uozumi¹, Tadafumi Koyama¹, Kenta Inagaki¹, Michiya Sasaki¹, Takatoshi Hijikata¹, Tetsuya Kato¹, Daisuke Yamauchi² (1. CRIEPI, 2. TEPCO HD)

5:05 PM - 5:20 PM

[1F17] Assessment of dust dispersion data for future safety analysis of Fukushima Daiichi fuel debris retrieval

(12) Study of methodorogy to estimate Airborne Release Fraction for cutting actual fuel debris

*Tadafumi Koyama¹, Kinya Nakamura¹, Koichi Uozumi¹, Tanzo Kanai¹, Shun Kanagawa¹, Takatoshi Hijikata¹, Tetsuya Kato¹, Daisuke Yamauchi², Kazutaka Mogi², Yuichi Iwata² (1. CRIEPI, 2. TEPCO)

5:20 PM - 5:35 PM

[1F18] Assessment of dust dispersion data for future safety analysis of Fukushima Daiichi fuel debris retrieval

(13) Development of a model to simulate dispersion behavior of dust with non-spherical shapes.

*Kenta Inagaki¹, Tadafumi Koyama¹, Koichi Uozumi¹, Taizo Kanai¹, Kinya Nakamura¹, Shun Kanagawa¹, Tetsuya Kato¹, Yamauchi Daisuke ², Kazutaka Mogi², Yuichi Iwata² (1. CRIEPI, 2. TEPCO HD)

5:35 PM - 5:50 PM

[1F19] Assessment of dust dispersion data for future safety analysis of Fukushima Daiichi fuel debris retrieval

(14) Basic study of safety assessment regarding airborne dust release during fuel debris retrieval

*Michiya Sasaki¹, Tadafumi Koyama¹, Takatoshi Hattori², Koichi Uozumi¹, Kinya Nakamura¹, Taizo Kanai¹, Kenta Inagaki¹, Shun Kanagawa¹, Takatoshi Hijikata¹, Tetsuya Kato¹ (1. CRIEPI, 2. NDF)

Time reserved for Chair （5:50 PM - 6:00 PM）

Oral presentation

[2F01-05] Fuel Debris 4

Thu. Sep 7, 2023 9:30 AM - 10:50 AM Room F (Okuma Machine Tool Eng. Bildg. 2F Lecture Room)

Chair:Koichi Uozumi(CRIEPI)

9:30 AM - 9:45 AM

[2F01] Establishment of Characterization Method for Small Fuel Debris Using the World’s First Isotope Micro Imaging Apparatus

(1) Application of Isotope Micro Imaging Apparatus to Decommissioning: Overview

*Tetsuo Sakamoto¹, Masato Morita¹, Hideki Tomita², Masato Mizokami³, Mutsumi Hirai³, Yoshihiro Iwata⁴, Masabumi Miyabe⁴, Takeru Yoshida⁴, Yoshihiro Sekio⁴, Koji Maeda⁴ (1. Kogakuin University, 2. Nagoya University, 3. TEPCO, 4. JAEA)

9:45 AM - 10:00 AM

[2F02] Establishment of Characterization Method for Small Fuel Debris Using the World’s First Isotope Micro Imaging Apparatus

(2) Performance and Specifications of Isotope Micro Imaging Apparatus and Development for Practical Analysis

*Masato Morita¹, Shouki Yoshimura¹, Tamaki Matsumura¹, Hideki Tomita², Hiroki Miura², Tetsuo Sakamoto¹ (1. Kogakuin University, 2. Nagoya University)

10:00 AM - 10:15 AM

[2F03] Establishment of Characterization Method for Small Fuel Debris Using the World’s First Isotope Micro Imaging Apparatus

(3) Development of fundamental/SHG mode switching of grating Ti:Sapphire laser for multi element analysis

*Hideki Tomita¹, Hiroki Miura¹, Naoki Matsumoto¹, Tetsuo Sakamoto² (1. Nagoya Univ., 2. Kogakuin Univ.)

10:15 AM - 10:30 AM

[2F04] Establishment of Characterization Method for Small Fuel Debris Using the World’s First Isotope Micro Imaging Apparatus

(4) Development of Resonance Ionization Scheme for Highly Sensitive and Accurate Isotope Analysis

*Yoshihiro Iwata¹, Masabumi Miyabe¹, Ikuo Wakaida¹, Shouki Yoshimura², Tamaki Matsumura², Masato Morita², Tetsuo Sakamoto² (1. JAEA, 2. Kogakuin Univ.)

10:30 AM - 10:45 AM

[2F05] Establishment of Characterization Method for Small Fuel Debris Using the World’s First Isotope Micro Imaging Apparatus

(5) Micro-Area Isotope Composition Analysis of Fukushima Daiichi Nuclear Power Plant Contaminant

*Takeru Yoshida¹, Yoshihiro Sekio¹, Koji Maeda¹, Masato Morita², Tetsuo Sakamoto², Masato Mizokami³, Mutsumi Hirai³ (1. JAEA, 2. Kogakuin Univ., 3. TEPCO HD)

Time reserved for Chair （10:45 AM - 10:50 AM）

Oral presentation

[2F06-09] Fuel Debris 5

Thu. Sep 7, 2023 10:50 AM - 11:55 AM Room F (Okuma Machine Tool Eng. Bildg. 2F Lecture Room)

Chair:Kenta Inagaki(CRIEPI)

10:50 AM - 11:05 AM

[2F06] Development of ultramicro analysis technology for fuel debris analysis

(18)Overview of our project and current state

*Tatsuya Suzuki¹, Hiroyuki Kazama², Yoshihiro Sekio², Koji Maeda², Toru Higuchi³, Kazuya Idemitsu⁴, Kenji Konashi⁴, Yasuyoshi Nagai⁴ (1. Nagaoka University of Technology, 2. JAEA, 3. NFD, 4. Tohoku Univ.)

11:05 AM - 11:20 AM

[2F07] Development of ultramicro analysis technology for fuel debris analysis

(19) Dissolution behaviors of uranium simulated debris by using alkaline fusion method

*ZhuoRan Ma¹, Hiroyuki Kazama³, Yoshiya Homma², Kenji Konashi², Tatsuya Suzuki¹ (1. Nagaoka Univ. of Tech., 2. Tohoku Univ., 3. JAEA)

11:20 AM - 11:35 AM

[2F08] Development of ultramicro analysis technology for fuel debris analysis

(20) Chromatographic separation of Actinides and Lanthanides by using impregnated resins

*Fauzia Hanum Ikhwan¹, Hiroyuki Kazama², Chikage Abe³, Kenji Konashi³, Tatsuya Suzuki¹ (1. Nagaoka University of Tech., 2. JAEA, 3. Toho Univ.)

11:35 AM - 11:50 AM

[2F09] Development of ultramicro analysis technology for fuel debris analysis

(21)Actinide separation from irradiated fuels by extraction chromatography

*Huiroyuki Kazama¹, Takashi Ohnishi¹, Fauzia Hanum Ikhwan², Tatsuya Suzuki², Yoshihiro Sekio¹, Koji Maeda¹, Shin-ichi Koyama¹, Kenji Konashi³, Kazuya Idemitsu³, Yasuyoshi Nagai³ (1. JAEA, 2. Nagaoka Univ. of Tech., 3. Tohoku Univ.)

Time reserved for Chair （11:50 AM - 11:55 AM）

Oral presentation

[2F10-13] Fuel Debris 6

Thu. Sep 7, 2023 2:45 PM - 3:50 PM Room F (Okuma Machine Tool Eng. Bildg. 2F Lecture Room)

Chair:Akihiro Suzuki(NFD)

2:45 PM - 3:00 PM

[2F10] Development of ultramicro analysis technology for fuel debris analysis

(22) Fabrication of simulated fuel debris using coprecipitation and mechanical alloying methods

*Yusuke Miura¹, Atsushi Ohuchi¹, Toru Higuchi¹, Kenji Konashi² (1. NFD, 2. Tohoku Univ.)

3:00 PM - 3:15 PM

[2F11] Development of ultramicro analysis technology for fuel debris analysis

(23) Mössbauer and XRD analyses of simulated fuel debris (II)

*Yoshiya Homma¹, Hiroyuki Kazama², Katsuya Suzuki¹, Satoru Matsuo¹, Kenta Yoshida¹, Atsushi Ouchi³, Yusuke Miura³, Toru Higuchi³, Kenji Konashi¹, Yasuyoshi Nagai¹ (1. Tohoku University, 2. JAEA, 3. NFD)

3:15 PM - 3:30 PM

[2F12] Development of ultramicro analysis technology for fuel debris analysis

(24) 3D-FIB-SEM measurement of inner surface precipitates in fuel debris

*Kenta Yoshida¹, Hotaka Miyata¹, Satoru Matsuo¹, Hiroyuki Kazama², Yoshiya Homma¹, Kenji Konashi¹, Yausyoshi Nagai¹ (1. Tohoku Univ., 2. JAEA)

3:30 PM - 3:45 PM

[2F13] Development of ultramicro analysis technology for fuel debris analysis

(25) Study of fuel debris stability for geological disposal - Behavior of (U, Zr)O_x dissolution

*KAZUYA IDEMITSU¹, Yaohiro Inagaki², Tatsumi Arima² (1. Tohoku University , 2. Kyushu University)

Time reserved for Chair （3:45 PM - 3:50 PM）

Oral presentation

[2F14-18] Decommissioning of Reactor Facility 1

Thu. Sep 7, 2023 3:50 PM - 5:10 PM Room F (Okuma Machine Tool Eng. Bildg. 2F Lecture Room)

Chair:KAZUYA IDEMITSU(Tohoku Univ.)

3:50 PM - 4:05 PM

[2F14] Utilizing the Knowledge Gained from Dismantling of Reactor Peripheral Equipment

*Kenta Aratani¹, Yuta Miyamoto¹, Haruhiko Kadowaki¹, Masashi Tezuka¹ (1. JAEA)

4:05 PM - 4:20 PM

[2F15] A study on analysis of actual date in “FUGEN” decommissioning

Dismantling of nuclear reactor peripheral equipment

*yuya koda¹, yukihiro iguchi², satoshi yanagihara² (1. JAEA, 2. Univ. of Fukui)

4:20 PM - 4:35 PM

[2F16] A Study for the optimization of the decommissioning project of nuclear facilities

(4) Assessment of management and maintenance costs

*Yukihiro IGUCHI¹, Daisuke KAWASAKI¹, Satoshi YANAGIHARA¹, Yuya KOUDA² (1. University of Fukui, 2. JAEA)

4:35 PM - 4:50 PM

[2F17] Study and development of lead block cutting technique for decommissioning nuclear power plants Ⅲ

*Tomohisa Goto^1,3, Glenn Harvel², Takeyoshi Sunagawa¹ (1. FUT, 2. Ontario Tech Univ., 3. Taihei Dengyo Ltd.)

4:50 PM - 5:05 PM

[2F18] Importance of Generativity for the Decommissioning Knowledge Management

Focus Group on Plant Operating Knowledge

*Yasuyoshi TARUTA¹, Shigeto KOBAYASHI², Takashi HASHIMOTO³, Koichi TOMODA¹ (1. Japan Atomic Energy Agency, 2. Sapporo City University, 3. Japan Advanced Institute of Science and Technology)

Time reserved for Chair （5:05 PM - 5:10 PM）

Oral presentation

[2F19-22] Decommissioning of Reactor Facility 2

Thu. Sep 7, 2023 5:10 PM - 6:20 PM Room F (Okuma Machine Tool Eng. Bildg. 2F Lecture Room)

Chair:Yukihiro IGUCHI(Univ. of Fukui)

5:10 PM - 5:25 PM

[2F19] Phase 2 of Monju Decommissioning

(1) Overall Picture of Monju Decommissioning Plan and Positioning of Phase 2

*Keiji Naruse¹, Kazuaki Matsui¹, Ikuhito Obata¹, Hiromasa Sawazaki¹, Takehiro Goto¹, Takahisa Jo¹ (1. JAEA)

5:25 PM - 5:40 PM

[2F20] Phase 2 of Monju Decommissioning

(2) Reducing the Risk of Possessing Sodium for “Monju”

*Yuki Nishino¹, Shimpei Kuramoto¹, Keiji Naruse¹, Hajime Nishino¹, Takehiro Goto¹, Toru Takeuchi¹ (1. Japan Atomic Energy Agency)

5:40 PM - 5:55 PM

[2F21] Phase 2 of Monju Decommissioning

(3) Study for Sodium Equipment Disassembling and Assessment of residual Sodium

*Yuta Isobe¹, Takehiro Hayashi¹, Takanori Tanigaki¹, Nobuaki Miyoshi¹, Sho Kawanago¹, Ikuhito Obata¹, Takanori Kobayashi¹ (1. JAEA)

5:55 PM - 6:10 PM

[2F22] Phase 2 of Monju Decommissioning

(4)Assessment of contamination distribution of "Monju"

*Shotaro Hanaki¹, Ryutaro Mashimo¹, Tomohiro Nanri¹, Hirokazu Hayashi¹ (1. JAEA)

Time reserved for Chair （6:10 PM - 6:20 PM）

Oral presentation

[3F01-04] Research for Decommissioning

Fri. Sep 8, 2023 9:30 AM - 10:35 AM Room F (Okuma Machine Tool Eng. Bildg. 2F Lecture Room)

Chair:Norikazu Kinoshita(Shimizu)

9:30 AM - 9:45 AM

[3F01] Research for realization of smooth and steady decommissioning

(1) Overall summary

*Junji Eto¹, Shintaro Yagi¹, Kazuhito Yoshida¹, Masaki Onodera¹, Mariko Regalado¹, Kota Kawai¹, Tomomichi Uegata¹ (1. MRI)

9:45 AM - 10:00 AM

[3F02] Research for realization of smooth and steady decommissioning

(2)Research of case studies for decommissioning in advanced area in Japan and oversea

*Kazuhito Yoshida¹, Junji Eto¹, Masaki Onodera¹, Shintaro Yagi¹, Mariko Regalado¹, Hiroshi Suzuki¹, Toshiyuki Takeda¹, Kota Kawai¹, Tomomichi Uegata¹ (1. MRI)

10:00 AM - 10:15 AM

[3F03] Research for realization of smooth and steady decommissioning

(3)Research for feasibility studies of smooth and steady decommisioning business

*Shintaro Yagi¹, Junji Eto¹, Masaki Onodera¹, Hiroshi Suzuki¹, Kota Kawai¹, Tosiyuki Takeda¹, Tomomichi Uegata¹, Kazuhito Yoshida¹, Mariko Regalado¹ (1. Mitsubishi Research Institute)

10:15 AM - 10:30 AM

[3F04] Research for realization of smooth and steady decommissioning

(4)Human resource development and utilization of local assets for 1F decommissioning

*Mariko Regalado¹, Junji Etou¹, Hiroshi Suzuki¹, Toshiyuki Takeda¹, Masaki Onodera¹, Kota Kawai¹, Tomomichi Uegata¹, Kazuhito Yoshida¹, Shintaro Yagi¹ (1. MRI)

Time reserved for Chair （10:30 AM - 10:35 AM）

Oral presentation

[3F05-09] Decommissioning Technology

Fri. Sep 8, 2023 10:35 AM - 12:00 PM Room F (Okuma Machine Tool Eng. Bildg. 2F Lecture Room)

Chair:Yoshihiro Iwata(JAEA)

10:35 AM - 10:50 AM

[3F05] Standard models of commercial nuclear reactor in Japan for using radioactivity calculations

(1) Outline

*Kazuyuki Torii¹, Kazuaki Kosako¹, Takuma Noto¹, Yuki Sasaki¹ (1. Shimizu Corporation)

10:50 AM - 11:05 AM

[3F06] Standard models of commercial nuclear reactor in Japan for using radioactivity calculations

(2) Preparation of BWR standard model

*Kazuaki Kosako¹, Takuma Noto¹, Hayato Takeshita¹, Yuki Sasaki¹, Kazuyuki Torii¹ (1. Shimizu Corporation)

11:05 AM - 11:20 AM

[3F07] Evaluation of the effect of random storage in clearance measurement containers on the radioactivity conversion factor (3)

Quantification of maldistribution of density and specific surface area in units of measurement

*Masato Watanabe¹, Ryouji Mizuno², Toshio Kuzuya³ (1. Chubu Electric Power, 2. Chuden CTI, 3. Techno Chubu )

11:20 AM - 11:35 AM

[3F08] Volume reduction of concrete contaminated by ¹⁴CO₂

(1) Condition for separating aggregate by rubbing

*Hitoshi Nakashima¹, Norikazu Kinoshita¹, Kazutaka Torii¹, Yuki Sasaki¹, Mamoru Hanzawa¹ (1. Shimizu corporation)

11:35 AM - 11:50 AM

[3F09] Volume reduction of concrete contaminated by ¹⁴CO₂

(2) Infiltration of ¹⁴CO₂ in mortar

*Norikazu Kinoshita¹, Hitoshi Nakashima¹, Kazuyuki Torii¹, Yuki Sasaki¹, Mamoru Hanzawa¹, Aya Sakaguchi², Keisuke Sueki² (1. Shimizu, 2. Univ. of Tsukuba)

Time reserved for Chair （11:50 AM - 12:00 PM）

Oral presentation

[3F10-15] Decommissioning of Accident Reactor

Fri. Sep 8, 2023 2:45 PM - 4:20 PM Room F (Okuma Machine Tool Eng. Bildg. 2F Lecture Room)

Chair:Masato Watanabe(Chubu Electric Power)

2:45 PM - 3:00 PM

[3F10] TEPCO Fukushima Daiichi Nuclear Power Station Unit 1 Pedestal Damage Evaluation and Impact Evaluation on Spent Fuel Pool when Reactor Overturn

*Anri Nakashima², Yasufumi Kitamura¹, Haruo Morishige², Hideo Ymasaki² (1. Kitamura Co., Ltd., 2. Fukushima Nuclear, Accident Countermeasures Review Group)

3:00 PM - 3:15 PM

[3F11] TEPCO Fukushima Daiichi Nuclear Power Station Unit 1 reactor Seismic evaluation and fall countermeasure proposal

*Haruo Morishige¹, Yasufumi Kitamura Kitamura², Hideo Yamasaki¹, Anri Nakashima¹ (1. Fukushima Nuclear Accident Countermeasures Review Group, 2. Kitamura Corporation)

3:15 PM - 3:30 PM

[3F12] Study on degradation scenario for an accident-damaged reactor building and its reflection on the long-term maintenance plan

*Koji Dozaki¹, Takayuki Aoki¹ (1. Tohoku University)

3:30 PM - 3:45 PM

[3F13] Preliminary test of alpha-nuclides removal performance of various adsorbents using actual stagnant water of Fukushima-Daiichi Nuclear Power Plant

*Junichi Tanabe¹, Hajime Katsumata¹, Katsuhiro Konno¹, Mamoru Kamoshida¹ (1. Tokyo Electric Power Company Holdings, Inc.)

3:45 PM - 4:00 PM

[3F14] Development of the radiation resistant remote vibration sensing device for the reactor decommissioning

*Kazuyuki Furuya¹, Shiro Jitsukawa^1,2, Sugita Hisao¹, Takayuki Saito¹, Masahiro Shimoyama², Kazunari Aizawa² (1. NIT Hachinohe College, 2. RADA)

4:00 PM - 4:15 PM

[3F15] Analytical Study of Hydrogen Behavior in a Radioactive Material Storage Container with Recombination Catalyst

*atsuhiko terada Terada¹, Ryuji Nagaishi¹ (1. Japan Atomic Energy Agency)

Time reserved for Chair （4:15 PM - 4:20 PM）

Sessions

V. Nuclear Fuel Cycle and Nuclear Materials » 505-3 Decommissioning Technology of Nuclear Facilities

[1F01-03] Decommissioning of Reprocessing Facility

(1) Outline of study on HASWS and retrieval equipment

(2) Study of underwater ROV

(3) Study of underwater buoyancy

[1F04-07] Fuel Debris 1

(1)Development of detection instrument of nuclear fuel debris inside sediment

(2) Results of detection of nuclear fuel debris inside sediment in the primary containment vessel of unit 1

(56) Study on scale effect the drying behavior of fuel debris covered with water glass based neutron absorber

[1F08-13] Fuel Debris 2

(3) Development of precise measurement of dust dispersion behavior and methodology to derive airborne release fraction during cutting fuel debris

(4) Measurement of dust dispersion data during cutting cold simulants with disk cutter

(5) Measurement of dust dispersion data during breaking cold simulants with chisel

(6) Measurement of dust dispersion data during cutting cold simulants with core boring

(7) Measurement of dust dispersion data during cutting cold simulants with laser

(8) Comparison of dust dispersion behaviors during cutting cold simulants with disk cutter, chisel, core boring and laser

[1F14-19] Fuel Debris 3

(9) Measurement of dust dispersion data during cutting uranium oxide fuel debris with disk cutter

(10) Characterization of once-molten kg-scale fuel debris simulants containing uranium

(11) Measurement of dust dispersion data during cutting kg-scale fuel debris simulants containing uranium with disk cutter

(12) Study of methodorogy to estimate Airborne Release Fraction for cutting actual fuel debris

(13) Development of a model to simulate dispersion behavior of dust with non-spherical shapes.

(14) Basic study of safety assessment regarding airborne dust release during fuel debris retrieval

[2F01-05] Fuel Debris 4

(1) Application of Isotope Micro Imaging Apparatus to Decommissioning: Overview

(2) Performance and Specifications of Isotope Micro Imaging Apparatus and Development for Practical Analysis

(3) Development of fundamental/SHG mode switching of grating Ti:Sapphire laser for multi element analysis

(4) Development of Resonance Ionization Scheme for Highly Sensitive and Accurate Isotope Analysis

(5) Micro-Area Isotope Composition Analysis of Fukushima Daiichi Nuclear Power Plant Contaminant

[2F06-09] Fuel Debris 5

(18)Overview of our project and current state

(19) Dissolution behaviors of uranium simulated debris by using alkaline fusion method

(20) Chromatographic separation of Actinides and Lanthanides by using impregnated resins

(21)Actinide separation from irradiated fuels by extraction chromatography

[2F10-13] Fuel Debris 6

(22) Fabrication of simulated fuel debris using coprecipitation and mechanical alloying methods

(23) Mössbauer and XRD analyses of simulated fuel debris (II)

(24) 3D-FIB-SEM measurement of inner surface precipitates in fuel debris

(25) Study of fuel debris stability for geological disposal - Behavior of (U, Zr)Ox dissolution

[2F14-18] Decommissioning of Reactor Facility 1

Dismantling of nuclear reactor peripheral equipment

(4) Assessment of management and maintenance costs

Focus Group on Plant Operating Knowledge

[2F19-22] Decommissioning of Reactor Facility 2

(1) Overall Picture of Monju Decommissioning Plan and Positioning of Phase 2

(2) Reducing the Risk of Possessing Sodium for “Monju”

(3) Study for Sodium Equipment Disassembling and Assessment of residual Sodium

(4)Assessment of contamination distribution of "Monju"

[3F01-04] Research for Decommissioning

(1) Overall summary

(2)Research of case studies for decommissioning in advanced area in Japan and oversea

(3)Research for feasibility studies of smooth and steady decommisioning business

(4)Human resource development and utilization of local assets for 1F decommissioning

[3F05-09] Decommissioning Technology

(1) Outline

(2) Preparation of BWR standard model

Quantification of maldistribution of density and specific surface area in units of measurement

(1) Condition for separating aggregate by rubbing

(2) Infiltration of 14CO2 in mortar

[3F10-15] Decommissioning of Accident Reactor

Authentication

(25) Study of fuel debris stability for geological disposal - Behavior of (U, Zr)O_x dissolution

(2) Infiltration of ¹⁴CO₂ in mortar