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Proceedings Papers

Development of the Buckling Evaluation Method for Large Scale Vessels in Fast Reactors Made of Grade 91 Steel and Austenitic Stainless Steel With Large Initial Imperfections

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Takashi Okafuji, Kazuhiro Miura, Hiromi Sago, Hisatomo Murakami, Tomoyoshi Watakabe, Masanori Ando, Masashi Miyazaki
Proc. ASME. PVP2024, Volume 1: Codes & Standards; Computer Technology & Bolted Joints, V001T01A035, July 28–August 2, 2024
Publisher: American Society of Mechanical Engineers
Paper No: PVP2024-123103
https://doi.org/10.1115/PVP2024-123103
View Paper titled, Development of the Buckling Evaluation Method for Large Scale Vessels in Fast Reactors Made of Grade 91 Steel and Austenitic Stainless Steel With Large Initial Imperfections
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Topics: Buckling, Evaluation methods, Fast neutron reactors, Stainless steel, Steel, Vessels, Stress, Design, Power stations, Wall thickness
Proceedings Papers

Research and Development of Three-Dimensional Isolation System for Sodium-Cooled Fast Reactor: Part 8 — Assembly Static Test Results of Three-Dimensional Isolated Device by Bi-Axial Loadings

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Takahiro Somaki, Masaki Yukawa, Tsuyoshi Fukasawa, Tomoyuki Hirayama, Masato Uchita, Takayuki Miyagawa, Shigeki Okamura, Tomohiko Yamamoto, Tomoyoshi Watakabe, Masashi Miyazaki, Satoshi Fujita
Proc. ASME. PVP2024, Volume 5: Operations, Applications, & Components; Seismic Engineering; ASME Nondestructive Evaluation, Diagnosis and Prognosis (NDPD) Division, V005T08A007, July 28–August 2, 2024
Publisher: American Society of Mechanical Engineers
Paper No: PVP2024-124495
https://doi.org/10.1115/PVP2024-124495
View Paper titled, Research and Development of Three-Dimensional Isolation System for Sodium-Cooled Fast Reactor: Part 8 — Assembly Static Test Results of Three-Dimensional Isolated Device by Bi-Axial Loadings
Open the PDF for Research and Development of Three-Dimensional Isolation System for Sodium-Cooled Fast Reactor: Part 8 — Assembly Static Test Results of Three-Dimensional Isolated Device by Bi-Axial Loadings in another window
Topics: Industrial research, Manufacturing, Sodium fast reactors, Stress, Earthquake resistant design, Bearings, Dampers, Damping, Disks, Plates (structures)
Proceedings Papers

Research and Development of Three-Dimensional Isolation System for Sodium Cooled Fast Reactor: Part 7 Development Summary of Three-Dimensional Isolation System

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Tomoyoshi Watakabe, Tomohiko Yamamoto, Shigeki Okamura, Masashi Miyazaki, Takayuki Miyagawa, Masato Uchita, Tomoyuki Hirayama, Takahiro Somaki, Masaki Yukawa, Tsuyoshi Fukasawa, Satoshi Fujita
Proc. ASME. PVP2024, Volume 5: Operations, Applications, & Components; Seismic Engineering; ASME Nondestructive Evaluation, Diagnosis and Prognosis (NDPD) Division, V005T08A005, July 28–August 2, 2024
Publisher: American Society of Mechanical Engineers
Paper No: PVP2024-122430
https://doi.org/10.1115/PVP2024-122430
View Paper titled, Research and Development of Three-Dimensional Isolation System for Sodium Cooled Fast Reactor: Part 7 Development Summary of Three-Dimensional Isolation System
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Topics: Disks, Industrial research, Sodium fast reactors, Springs, Earthquakes, Design, Light water reactors, Pipes, Stress, Bearings
Proceedings Papers

Research and Development of Three-Dimensional Isolation System For Sodium Cooled Fast Reactor Part 9: Evaluating Seismic Isolation Performance Through Seismic Response Analysis

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Tsuyoshi Fukasawa, Takahiro Somaki, Masaki Yukawa, Tomoyuki Hirayama, Tomoyoshi Watakabe, Tomohiko Yamamoto, Shigeki Okamura, Masashi Miyazaki, Masato Uchita, Takayuki Miyagawa, Satoshi Fujita
Proc. ASME. PVP2024, Volume 5: Operations, Applications, & Components; Seismic Engineering; ASME Nondestructive Evaluation, Diagnosis and Prognosis (NDPD) Division, V005T08A004, July 28–August 2, 2024
Publisher: American Society of Mechanical Engineers
Paper No: PVP2024-121899
https://doi.org/10.1115/PVP2024-121899
View Paper titled, Research and Development of Three-Dimensional Isolation System For Sodium Cooled Fast Reactor Part 9: Evaluating Seismic Isolation Performance Through Seismic Response Analysis
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Topics: Bearings, Dampers, Design, Finite element methods, Finite element model, Industrial research, Rubber, Sodium fast reactors
Proceedings Papers

Benchmark Analysis on Pipe Support Structures for Establishing Inelastic Seismic Design

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Izumi Nakamura, Kiyotaka Takito, Ryuya Shimazu, Yukihiko Okuda, Michiya Sakai, Akihito Otani, Tomoyoshi Watakabe, Takahiro Okuda, Tadahiro Shibutani, Masaki Shiratori
Proc. ASME. PVP2024, Volume 5: Operations, Applications, & Components; Seismic Engineering; ASME Nondestructive Evaluation, Diagnosis and Prognosis (NDPD) Division, V005T08A028, July 28–August 2, 2024
Publisher: American Society of Mechanical Engineers
Paper No: PVP2024-123075
https://doi.org/10.1115/PVP2024-123075
View Paper titled, Benchmark Analysis on Pipe Support Structures for Establishing Inelastic Seismic Design
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Topics: Earthquake resistant design, Finite element methods, Pipes
Journal Articles

Ultimate Strength of a Thin Wall Tee for Sodium Cooled Fast Reactors Under Seismic Loads

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Tomoyoshi Watakabe, Hideki Takahashi
Journal: Journal of Pressure Vessel Technology
Publisher: ASME
Article Type: Research-Article
J. Pressure Vessel Technol. October 2023, 145(5): 051502.
Paper No: PVT-23-1034
https://doi.org/10.1115/1.4062675
Published Online: June 16, 2023
View Articletitled, Ultimate Strength of a Thin Wall Tee for Sodium Cooled Fast Reactors Under Seismic Loads
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Topics: Design, Failure, Failure mechanisms, Fatigue, Pipes, Stress, Thin wall structures, Dynamic response, Tensile strength, Finite element analysis
Proceedings Papers

Effect of the Plasticity of Piping and Support Structures on the Seismic Response of Piping Systems

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Takahiro Okuda, Hideki Takahashi, Tomoyoshi Watakabe, Masaki Morishita
Proc. ASME. ICONE29, Volume 6: Nuclear Codes, Standards, Licensing, and Regulatory Issues, V006T06A001, August 8–12, 2022
Publisher: American Society of Mechanical Engineers
Paper No: ICONE29-89097
https://doi.org/10.1115/ICONE29-89097
View Paper titled, Effect of the Plasticity of Piping and Support Structures on the Seismic Response of Piping Systems
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Topics: Earthquake resistant design, Pipes, Piping systems, Plasticity
Proceedings Papers

Seismic Assessment of Crossover Piping on a Sodium Cooled Fast Reactor With Three-Dimensional Isolation System

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Tomoyoshi Watakabe, Takahiro Okuda, Satoshi Okajima
Proc. ASME. PVP2022, Volume 5: Operations, Applications, and Components; Seismic Engineering; ASME Nondestructive Evaluation, Diagnosis and Prognosis (NDPD) Division, V005T08A011, July 17–22, 2022
Publisher: American Society of Mechanical Engineers
Paper No: PVP2022-85412
https://doi.org/10.1115/PVP2022-85412
View Paper titled, Seismic Assessment of Crossover Piping on a Sodium Cooled Fast Reactor With Three-Dimensional Isolation System
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Topics: Pipes, Sodium fast reactors
Proceedings Papers

Research and Examination of Seismic Safety Evaluation and Function Maintenance for Important Equipment in Nuclear Facilities

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Osamu Furuya, Satoshi Fujita, Hitoshi Muta, Yasuki Ohtori, Tatsuya Itoi, Shigeki Okamura, Keisuke Minagawa, Izumi Nakamura, Shigeru Fujimoto, Akihito Otani, Akemi Nishida, Tomoyoshi Watakabe
Proc. ASME. PVP2021, Volume 5: Operations, Applications, and Components; Seismic Engineering; Non-Destructive Examination, V005T08A022, July 13–15, 2021
Publisher: American Society of Mechanical Engineers
Paper No: PVP2021-61781
https://doi.org/10.1115/PVP2021-61781
View Paper titled, Research and Examination of Seismic Safety Evaluation and Function Maintenance for Important Equipment in Nuclear Facilities
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Topics: Maintenance, Nuclear power stations, Safety
Journal Articles

A JSME Code Case on Piping Seismic Design Based on Inelastic Response Analysis and Strain-Based Fatigue Criteria

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Masaki Morishita, Akihito Otani, Izumi Nakamura, Tomoyoshi Watakabe, Tadahiro Shibutani, Masaki Shiratori
Journal: Journal of Pressure Vessel Technology
Publisher: ASME
Article Type: Research-Article
J. Pressure Vessel Technol. April 2020, 142(2): 021203.
Paper No: PVT-19-1160
https://doi.org/10.1115/1.4045674
Published Online: February 24, 2020
View Articletitled, A JSME Code Case on Piping Seismic Design Based on Inelastic Response Analysis and Strain-Based Fatigue Criteria
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Topics: Fatigue, Pipes, Earthquake resistant design, Design, Cycles, Stress, Damping
Journal Articles

Benchmark Analyses on the Elastic–Plastic Behavior of Carbon Steel Pipes Under Seismic Load

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Izumi Nakamura, Tomoyoshi Watakabe, Akihito Otani, Tadahiro Shibutani, Masaki Morishita, Masaki Shiratori
Journal: Journal of Pressure Vessel Technology
Publisher: ASME
Article Type: Research-Article
J. Pressure Vessel Technol. April 2020, 142(2): 021901.
Paper No: PVT-19-1085
https://doi.org/10.1115/1.4045606
Published Online: February 24, 2020
View Articletitled, Benchmark Analyses on the Elastic–Plastic Behavior of Carbon Steel Pipes Under Seismic Load
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Topics: Pipes, Piping systems, Yield stress, Stress, Carbon steel, Work hardening, Approximation
Proceedings Papers

Research and Development of Three-Dimensional Isolation System for Sodium-Cooled Fast Reactor: Part 3 — Characteristics for Elements on Basis of Half-Scale Loading Tests

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Takahiro Somaki, Tsuyoshi Fukasawa, Shigeki Okamura, Takayuki Miyagawa, Masato Uchita, Tomohiko Yamamoto, Tomoyoshi Watakabe, Satoshi Fujita
Proc. ASME. PVP2019, Volume 8: Seismic Engineering, V008T08A037, July 14–19, 2019
Publisher: American Society of Mechanical Engineers
Paper No: PVP2019-93475
https://doi.org/10.1115/PVP2019-93475
View Paper titled, Research and Development of Three-Dimensional Isolation System for Sodium-Cooled Fast Reactor: Part 3 — Characteristics for Elements on Basis of Half-Scale Loading Tests
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Topics: Bearings, Disks, Industrial research, Rubber, Sodium fast reactors, Springs, Dampers, Design methodology, Displacement, Dynamic testing (Materials)
Proceedings Papers

Applicability of Seismic Fatigue Evaluation by JSME Code Case, NC-CC-008

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Akihito Otani, Izumi Nakamura, Tomoyoshi Watakabe, Masaki Morishita, Tadahiro Shibutani, Masaki Shiratori
Proc. ASME. PVP2019, Volume 8: Seismic Engineering, V008T08A001, July 14–19, 2019
Publisher: American Society of Mechanical Engineers
Paper No: PVP2019-93123
https://doi.org/10.1115/PVP2019-93123
View Paper titled, Applicability of Seismic Fatigue Evaluation by JSME Code Case, NC-CC-008
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Topics: Cycles, Earthquake resistant design, Fatigue, JSME Standards, Pipes
Proceedings Papers

Research and Development of Three-Dimensional Isolation System for Sodium-Cooled Fast Reactor: Part 4 — Proposal of Optimal Combination Method for Disc Spring Units and Newly Friction Model for Sliding Elements

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Tsuyoshi Fukasawa, Shigeki Okamura, Takahiro Somaki, Takayuki Miyagawa, Masato Uchita, Tomohiko Yamamoto, Tomoyoshi Watakabe, Satoshi Fujita
Proc. ASME. PVP2019, Volume 8: Seismic Engineering, V008T08A038, July 14–19, 2019
Publisher: American Society of Mechanical Engineers
Paper No: PVP2019-93480
https://doi.org/10.1115/PVP2019-93480
View Paper titled, Research and Development of Three-Dimensional Isolation System for Sodium-Cooled Fast Reactor: Part 4 — Proposal of Optimal Combination Method for Disc Spring Units and Newly Friction Model for Sliding Elements
Open the PDF for Research and Development of Three-Dimensional Isolation System for Sodium-Cooled Fast Reactor: Part 4 — Proposal of Optimal Combination Method for Disc Spring Units and Newly Friction Model for Sliding Elements in another window
Topics: Disks, Friction, Industrial research, Sodium fast reactors, Springs, Algorithms, Bearings, Dampers, Dimensions, Quality control
Proceedings Papers

Appropriate Damping on Seismic Design Analysis for Inelastic Response Assessment of Piping

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Tomoyoshi Watakabe, Masaki Morishita
Proc. ASME. PVP2018, Volume 8: Seismic Engineering, V008T08A007, July 15–20, 2018
Publisher: American Society of Mechanical Engineers
Paper No: PVP2018-84470
https://doi.org/10.1115/PVP2018-84470
View Paper titled, Appropriate Damping on Seismic Design Analysis for Inelastic Response Assessment of Piping
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Topics: Damping, Earthquake resistant design, Pipes, Design, Plasticity, Inelastic analysis, Elastic analysis, Emission spectroscopy, Engineering standards, Finite element analysis
Proceedings Papers

Research and Development of Three-Dimensional Isolation System for Sodium-Cooled Fast Reactor: Part 1 — Proposal of Analytical Models Based on Loading Tests

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Tsuyoshi Fukasawa, Shigeki Okamura, Takahiro Somaki, Takayuki Miyagawa, Masato Uchita, Tomohiko Yamamoto, Tomoyoshi Watakabe, Satoshi Fujita
Proc. ASME. PVP2018, Volume 8: Seismic Engineering, V008T08A038, July 15–20, 2018
Publisher: American Society of Mechanical Engineers
Paper No: PVP2018-84532
https://doi.org/10.1115/PVP2018-84532
View Paper titled, Research and Development of Three-Dimensional Isolation System for Sodium-Cooled Fast Reactor: Part 1 — Proposal of Analytical Models Based on Loading Tests
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Topics: Bearings, Dampers, Damping, Design, Differential equations, Disks, Industrial research, Reactor vessels, Rubber, Sodium fast reactors
Proceedings Papers

Application of JSME Seismic Code Case by Elastic-Plastic Response Analysis to Practical Piping System

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Akihito Otani, Satoru Kai, Naoaki Kaneko, Tomoyoshi Watakabe, Masanori Ando, Kazuyuki Tsukimori
Proc. ASME. PVP2018, Volume 8: Seismic Engineering, V008T08A001, July 15–20, 2018
Publisher: American Society of Mechanical Engineers
Paper No: PVP2018-84079
https://doi.org/10.1115/PVP2018-84079
View Paper titled, Application of JSME Seismic Code Case by Elastic-Plastic Response Analysis to Practical Piping System
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Topics: Japan Society of Mechanical Engineers, Piping systems, Earthquake resistant design, Fatigue, Pipes, Breeder reactors, Coolants, Engineering standards, Piping design, Stiffness
Journal Articles

Study on Piping Seismic Response Under Multiple Excitation

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Satoru Kai, Tomoyoshi Watakabe, Naoaki Kaneko, Kunihiro Tochiki, Kazuyuki Tsukimori, Akihito Otani
Journal: Journal of Pressure Vessel Technology
Publisher: ASME
Article Type: Research-Article
J. Pressure Vessel Technol. June 2018, 140(3): 031801.
Paper No: PVT-17-1118
https://doi.org/10.1115/1.4039453
Published Online: April 10, 2018
View Articletitled, Study on Piping Seismic Response Under Multiple Excitation
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Topics: Excitation, Pipes, Piping systems, Stress
Proceedings Papers

Development on Rubber Bearings for Sodium-Cooled Fast Reactor: Part 5 — Non-Linear Analytical Models for Thick Rubber Bearing

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Tsutomu Hirotani, Takahiro Mori, Tsuyoshi Fukasawa, Shigeki Okamura, Tomohiko Yamamoto, Tomoyoshi Watakabe
Proc. ASME. PVP2017, Volume 8: Seismic Engineering, V008T08A046, July 16–20, 2017
Publisher: American Society of Mechanical Engineers
Paper No: PVP2017-65655
https://doi.org/10.1115/PVP2017-65655
View Paper titled, Development on Rubber Bearings for Sodium-Cooled Fast Reactor: Part 5 — Non-Linear Analytical Models for Thick Rubber Bearing
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Topics: Bearings, Rubber, Sodium fast reactors, Finite element methods, Finite element model, Springs, Elasticity, Finite element analysis, Shear (Mechanics), Thermal stresses
Proceedings Papers

Seismic Qualification of Piping Systems by Detailed Inelastic Response Analysis: Part 1 — A Code Case for Piping Seismic Evaluation Based on Detailed Inelastic Response Analysis

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Masaki Morishita, Akihito Otani, Tomoyoshi Watakabe, Izumi Nakamura, Tadahiro Shibutani, Masaki Shiratori
Proc. ASME. PVP2017, Volume 8: Seismic Engineering, V008T08A001, July 16–20, 2017
Publisher: American Society of Mechanical Engineers
Paper No: PVP2017-65166
https://doi.org/10.1115/PVP2017-65166
View Paper titled, Seismic Qualification of Piping Systems by Detailed Inelastic Response Analysis: Part 1 — A Code Case for Piping Seismic Evaluation Based on Detailed Inelastic Response Analysis
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Topics: Pipes, Piping systems, Fatigue, Damping, Earthquake resistant design, Inelastic analysis, Japan Society of Mechanical Engineers, Plasticity, Absorption, Design