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Nuclear Reactor Safety

Nuclear
Reactor
Safety

Nejdet ERKAN Project Associate Professor

Nejdet ERKANProject Associate Professor

erkan@n.t.u-tokyo.ac.jp

Experimental and Numerical Nuclear Thermal-Hydraulics for Nuclear Safety and Accidents

The technology of the experimental instruments has reached to very advanced levels recently. In parallel, the computational methods and resources gained tremendous capacity that can employ sophisticated modeling techniques for real-life problems. To validate the results of the digital world, a high-quality experimental data set (diverse, multi-dimensional, high-resolution, and accurate) is extremely needed. To understand the sophisticated dynamics of nuclear accidents and to enhance the nuclear safety, we perform experiments and numerical simulations related to thermal-hydraulics phenomena existing in nuclear systems. We use/develop advanced visualization and measurement techniques for fluid flow and heat flow (PIV, PIV/TSP, Shadowgraphy etc.) diagnostics to acquire high-quality real-world data. We use the computational tools such as OpenFOAM and other CFD codes, and validate their models with the experimental results which are obtained from small-scale setups, and extrapolate acquired knowledge to real-scale problems.

Department/Institute/Research Center

Main post:Department Nuclear Engineering and Management

Keywords

Nuclear Thermal-Hydraulics, Nuclear Safety, Severe Accident, Particle Image Velocimetry (PIV), OpenFOAM

Nuclear
Reactor
Safety

Koji OKAMOTO Professor

Koji OKAMOTOProfessor

1961
okamoto@n.t.u-tokyo.ac.jp

Website

Visualization and Nuclear Safety

"Visualization" is the key technology on 21 century. We focused on the Information Visualization and Quantitative Visualization. The huge amount of data will be visualized to understand the complex phenomena and/or to resolve the core mechanism of the complex systems. The laser and high-speed camera will resolve the invisible world with quantitative information. We are the world top class laboratory for quantitative visualization.
In the Nuclear Safety, visualization is also the key system. The complex huge system, e.g. Nuclear Power Plant, will be resolved using the visualization technology. The Nuclear Energy will be a promising source of energy to help the world, especially developing countries. However, public understandings will be needed, especially in Japan. Using the visualization technology, we will provide an open access of the Nuclear Energy. We really need a trailblazer for the complex future.

Department/Institute/Research Center

Main post:Nuclear Professional School
Other posts:Department Nuclear Engineering and Management、Director, JAEA Collaborative Laboratories for Advanced Decommissioning Science

Keywords

Visualization, Nuclear safety, Severe accident

Nuclear
Reactor
Safety

Naoto KASAHARA Professor

Naoto KASAHARAProfessor

1960
kasahara@n.t.u-tokyo.ac.jp

Website

Design by analysis for energy plants

Energy plants are complex systems related with thermal-fluid-structural mechanics. Understanding of essential mechanism of multi-physics phenomena will lead to development of systematic models on thermal load - structural response - material strength in plants. These enable superior design which can satisfy both plant safety and economics.
Most of them are joint research programs with external companies. They will give you educational chance to learn academic research organization and project management.
Through concrete research on structural design of fast breeder reactors, students can learn rational and general methodologies applicable to other fields.

Department/Institute/Research Center

Main post:Department Nuclear Engineering and Management
Other posts:JAXA Visiting Researcher

Keywords

Nuclear Structural Engineering, Elevated Temperature Structural Design, Fast Breeder Reactor

Nuclear
Reactor
Safety

Takumi SAITO Associate Professor

Takumi SAITOAssociate Professor

1977
saito@n.t.u-tokyo.ac.jp

Website

Chemistry for Nuclear Waste Disposal and Environmental Behaviors of Radionuclides

It is duty of our generation to settle the issues of nuclear waste disposal. Geological disposal is a feasible option for high-level wastes or spent fuels, where various basic research and R&D are still needed to improve the reliability. Chemistry of radionuclides is a key foundation to realize a well-accepted disposal system. Thus, we are pursuing understanding and modeling of the chemistry that governs the interaction of radionuclides with materials of engineering barriers and the migration of radionuclides in subsurface environments, using sophisticated spectroscopy with X-ray, laser, and neutron, chromatographic techniques, and computer simulation. Knowledge obtained through the research has been applied to the modeling of chemodynamics of radionuclides released from the accident of the Fukushima Daiichi nuclear power plant or other non-radioactive pollutants in environments. Any student who has an interest in the issue of nuclear waste disposal are welcomed, no matter what academic backgrounds they have.

Department/Institute/Research Center

Main post:Nuclear Professional School
Other posts:Department Nuclear Engineering and Management

Keywords

Nuclear waste disposal, Physical chemistry, Geochemistry, Actinide chemistry

Nuclear
Reactor
Safety

Shunichi SUZUKI Project Professor

Shunichi SUZUKIProject Professor

1957
s_suzuki@n.t.u-tokyo.ac.jp

Decommissioning of Fukushima Dai-ichi NPP and project management

In order to complete the decommissioning of Fukushima Dai-ichi NPP, we need to challenge and overcome the difficulties which no one has ever experienced. The key technology for decommissioning of the accident plants is how to solve the unsteady state problems caused by remarkable changes of environment, circumstances and the states of the plant condition with the lapse of time. Main theme of this course is finding the tasks and their solutions for decommissioning through evaluation of phenomena which may occur in the future and also though making the scenario with experiments such as material and thermal-hydraulic tests. This course will not only deepen your skill & knowledge on decommissioning, but also give you an opportunity to understand the importance of the project management and the way of System Thinking for a complex world which you will face in the future.

Department/Institute/Research Center

Main post:Institute of Engineering Innovation
Other posts:Department Nuclear Engineering and Management

Keywords

Decommissioning, System dynamics, Risk assessment, Resilience engineering

Nuclear
Reactor
Safety

Naoto SEKIMURA Professor

Naoto SEKIMURAProfessor

1958
sekimura@n.t.u-tokyo.ac.jp

Website

Nuclear Materials Engineering, Ageing Management of Light Water Reactors, Maintenance Engineering of Complex Systems, Multi-scale Simulation of Radiation Damage in Nuclear Materials, Systems Engineering for Nuclear Fuels, Knowledge-base for Nuclear Engineering

Multi-scale simulation and experimental studies on microscopic and macroscopic behaviors of nuclear materials under very severe conditions including energetic neutron irradiation are the major topics. I have been leading national projects for ageing management of nuclear reactors components and materials with other universities, national laboratories and industries. Our group is also working on international collaboration on safe long term operation of nuclear systems and seismic safety through intensive collaboration with IAEA and OECD/NEA .

Department/Institute/Research Center

Main post:Department Nuclear Engineering and Management
Other posts:Vice-President, The University of Tokyo(International、Japanese Education)

Keywords

Safety and Knowledge Management for Nuclear Systems, Multiscale Modeling of Materials

Nuclear
Reactor
Safety

Takashi TAKATA Project Professor

Takashi TAKATAProject Professor

1970
takata_t@n.t.u-tokyo.ac.jp

Deepening of Risk and Utilizing of Risk on Decision Making in Engineering Issue

We have no engineering system with absolute safety. Accordingly, A qualitative and quantitative understanding of risk on the system will be one of the most key issues to discuss its safety and to make a decision concerning with an application of the system.,
Since a nuclear power plant is a huge and complex engineering system, intrinsic risks in the plant include large uncertainties and numerous scenarios. Hence, a ratiocinative methodology will be of importance to clarify the risks. We have been developing the methodology based on experimental approaches as well as numerical simulation technology.
We have also investigated a qualitative characteristic of the information concerning with the risk, which is obtained in the risk assessment, and its elemental role on decision making so as to enhance development of human resources who has accomplishment of utilizing risk information on decision making reasonably.

Department/Institute/Research Center

Main post:Risk engineering course
Other posts:Department Nuclear Engineering and Management

Keywords

Risk assessment, Thermal-hydraulics, Numerical simulation, Uncertainty, Decision making, Nuclear safety

Nuclear
Reactor
Safety

Kazuyuki DEMACHI Associate Professor

Kazuyuki DEMACHIAssociate Professor

1970
demachi@nuclear.jp

Website

Abnormality Detection Technology

Development of Plant Safety, Security, Maintenance for NPP and Medical Imaging Technology:
1) Hand and Body Motion Recognition using Fish-eye camera for NPP Safety and Security,
2) Failure Sign Detection of Devices for Predictive Maintenance,
3) Madical Imating Technology for Real-time Tracking Radiation Therapy (RTRT.)

Department/Institute/Research Center

Main post:Department Nuclear Engineering and Management
Other posts:Nuclear Professional School

Keywords

Maintenance, Medical Technology, Movie Prediction

Nuclear
Reactor
Safety

Akira YAMAGUCHI Professor

Akira YAMAGUCHIProfessor

1957
yamaguchi@n.t.u-tokyo.ac.jp

Website

Trans-Science and Nuclear Risk

Science and technologies promise better life and more wealthy society in the future. Eventually, we gain benefits from the fruits. The idea does not adapt to the contemporary society. The societal value of the science and technology is closely concerned with the rational relationship of the technology and the society. Key words of science and technologies in the light of societal view are uncertainties, imaginary skill, unknowns, questioning attitude, rational decision making and so on. Contemporary science and technologies need to be established putting more emphasis on the societal acceptance in terms of risk and benefit, i.e. welfare of the society. Researches necessary to respond to the expectations are for: (1) simulating the technology (to understand phenomena), (2) perceiving the technology (to understand risk), and (3) assessing the technology (to make a decision rationally). Common baseline idea is to be developed by an academic field that deals with the lack of knowledge and unknowns, e.g. uncertainties. Energy is the source and foundation of social infrastructures. The dual aspect, light and shadow (safety and uncertainty), of the energy should be quantitatively understood in whole the society for a good and rational decision-making. Last but not least are, needless to say, the next generation researchers. It is a challenge for those living in Japan that have engraved the experience of nuclear disaster deeply in heart. Please join us for opening the door of risk and safety research.

Department/Institute/Research Center

Main post:Nuclear Professional School
Other posts:Department Nuclear Engineering and Management、Graduate School of Osaka University (Invited Professor)

Keywords

Risk assessment, Simulation, Unknown, Uncertainty, Decision making, Nuclear safety

Radiation Sources , Detection & Measurement

Radiation
Sources ,
Detection &
Measurement

Kenichi ISHIKAWA Professor

Kenichi ISHIKAWAProfessor

1969
ishiken@n.t.u-tokyo.ac.jp

Website

Attosecond Science and Particle Cancer Therapy

We study the interaction of a laser pulse and an ion beam with matter through theory and simulations. Our research interest is a new field called high-field phenomena and attosecond science, which studies the quantum dynamics in an ultrashort intense laser field. Especially, we investigate highly nonlinear processes such as high-harmonic generation and tunneling ionization as well as attosecond electron dynamics in atoms and molecules, based on atomic and plasma physics as well as quantum chemistry. Also, we develop a sophisticated method of dose calculation for heavy-ion cancer therapy, which also runs on the K supercomputer.

Department/Institute/Research Center

Main post:Department Nuclear Engineering and Management
Other posts:Photon Science Center、Department of Physics, School of Science

Keywords

High-order harmonic generation, High-field physics, Ab initio simulations, Monte-Carlo method

Radiation
Sources ,
Detection &
Measurement

Mitsuru UESAKA Professor

Mitsuru UESAKAProfessor

1957
uesaka@tokai.t.u-tokyo.ac.jp

Advanced and Compact Accelerators and Medical Physics

We are developing advanced and compact accelerators/lasers such as S-band photocathode RF electron gun and linear accelerator (linac), X-band Compton scattering monochromatic X-ray source, portable X-band linac X-ray source for nondestructive evaluation, X-band linac for pinpoint cancer therapy, fiber laser accelerator for basic radiation biology. Further, we are performing research on X-ray drug deliver system (DDS) for high quality diagnosis and synergy effect of chemical and radiation-therapies. R&D based medical physics are performed.

Department/Institute/Research Center

Main post:Nuclear Professional School
Other posts:Department Nuclear Engineering and Management、Department of Bioengineering

Keywords

Portable linear accelerator, Fiber laser, Radiation biology

Radiation
Sources ,
Detection &
Measurement

Masashi OHNO Associate Professor

Masashi OHNOAssociate Professor

1973
ohno@n.t.u-tokyo.ac.jp

Innovative analysis of nuclear material using superconducting radiation sensors

Our academic objective is to realize a new innovative high-energy-resolution spectroscopy for nuclear structure investigations, radioactive or non-radioactive nuclide identifications, material analyses, and radiotherapy. For example, non-destructive analysis of nuclear materials for safeguards and nuclear forensic requires improvement in accuracy and sensitivity. The precision spectroscopy of hard X-ray and gamma ray from the nuclear materials is powerful tool for the identification of the plutonium, uranium, actinide and their decay products. However it needs to resolve their X-ray or gamma ray peaks in the complex spectrum of around 100keV region, which cannot be resolved by the conventional detectors. Therefore, we have developed the superconducting radiation sensor with the ultra-high energy resolution. Now our research group has already obtained the world top energy resolution in high-energy gamma-ray region and also, tried to measure gamma-rays from fission products with this superconducting detector.

Department/Institute/Research Center

Main post:Nuclear Professional School
Other posts:Department Nuclear Engineering and Management

Keywords

Superconductivity, Nanotechnology, Gamma-ray spectroscopy, Charge particle therapy

Radiation
Sources ,
Detection &
Measurement

Hisaaki KUDO Associate Professor

Hisaaki KUDOAssociate Professor

1964
hkudo@nuclear.jp

Radiation chemistry and application of polymer materials

I am working on radiation chemistry and irradiation effects of polymer materials by using ion and electron beam accelerators.

Department/Institute/Research Center

Main post:Nuclear Professional School
Other posts:Department Nuclear Engineering and Management

Keywords

Radiation chemistry, Radiation application, Radiation degradation, Polymer material

Radiation
Sources ,
Detection &
Measurement

Hiroyuki TAKAHASHI Professor

Hiroyuki TAKAHASHIProfessor

1960
leo@n.t.u-tokyo.ac.jp

Website

Radiation Measurements and Instrumentation

Radiation measurements are very important in many science and technology areas. We develop quantum radiation detectors for various applications in many areas such as medical imaging, industrial imaging, basic science, etc. Microfabrication techniques, microelectronics and computer hardware techniques, and simulation calculations are effectively used in our research.

Department/Institute/Research Center

Main post:Institute of Engineering Innovation
Other posts:Department Nuclear Engineering and Management、Department of Bioengineering

Keywords

Radiation measurements, Gamma-ray imaging, Environmental radiation, Neutron detectors, Signal processing

Radiation
Sources ,
Detection &
Measurement

Shuichi Hasegawa Professor

Shuichi HasegawaProfessor

1966
hasegawa@n.t.u-tokyo.ac.jp

Website

Laser photons controlling isotopic atoms to manipulate physical and chemical reactions for isotope engineering

Recent progress has been made in engineering solid state lasers to extend their wavelengths and intensities, which leads less photon-cost and narrower bandwidth of the laser wavelength. Laser manipulation of atoms and molecules is one of the fruitful fields due to it. In nuclear engineering, the isotope manipulation and measurement are fundamental technology to pursue. Measurement of rare isotopes is also important for nuclear security or forensic science. We investigate interactions between photons and atoms to extend capability of the laser manipulation for nuclear engineering.

Department/Institute/Research Center

Main post:Nuclear Professional School
Other posts:Department Nuclear Engineering and Management

Keywords

laser science, Atomic and molecular science, Isotope engineering

Radiation
Sources ,
Detection &
Measurement

Hiroyuki MATSUZAKI Professor

Hiroyuki MATSUZAKIProfessor

1966
hmatsu@n.t.u-tokyo.ac.jp

Website

AMS, Isotope System, Earth Environmental System

Accelerator Mass Spectrometry (AMS) can analyze extremely rare long-lived radio isotopes such as 10Be(half life = 1.36x106 yr), 14C(5,730 yr), 26Al(7.2x105 yr),36Cl(3.01x105 yr), 129I(1.57x107 yr). These rare isotopes form special isotope systems with their stable isotopes which have precise information about earth environment system. Most famous isotope system is the 14C/12C system well known to be used for dating. Our laboratory has a 5MV tandem accelerator and developed multi-nuclide AMS system of which the performance retains world's top level. While we are applying AMS to various interdisciplinary research fields from archaeological to earth environmental sciences, recently we especially focus on the 129I/127I system. As iodine has a close relation with organic matter and is often found with important carbon reservoir such as methane hydrates and soils, we consider 129I/127I system is an important clue to elucidate the total carbon dynamics.

Department/Institute/Research Center

Main post:The University Museum
Other posts:Department Nuclear Engineering and Management

Keywords

Ion beam, AMS, Isotope geochemistry, Radioisotope environment assessment

Radiation
Sources ,
Detection &
Measurement

Shinichi YAMASHITA Associate Professor

Shinichi YAMASHITAAssociate Professor

1979
shin1@tokai.t.u-tokyo.ac.jp

What are induced by ionizing radiations? Utilization of advantages and overcome of disadvantages.

Ionizing radiations are closely related to most of the problems in nuclear engineering while they are utilized in practical fields such as cancer treatment in medical field, material processing in industrial field, etc. Understanding their features is essential in order to enhance their advantages as well as to overcome their disadvantages. Sequential events from pico- to microseconds (10−12-10−6 s)) induced by ionizing radiations are all our interest. Examples of research subjects are as follows: "Mechanism of radiation protection and enhancement caused by a tiny amount of chemicals", "water radiolysis (radiation-induced decomposition) with therapeutic high-energy heavy-ion beams", "radiation chemistry in gel matrix for development of polymer gel dosimeter", "effect of seawater constituents on water radiolysis", "gas evolutions from boiling water", etc. In addition, radiation effects at interfaces such as water-polymer (DNA, polysaccharides), water-metal/ceramic, and liquid water-water vapor have not been investigated well. I hope some students make breakthroughs in the frontier.

Department/Institute/Research Center

Main post:Nuclear Professional School
Other posts:Department Nuclear Engineering and Management

Keywords

Radiation effect (physical chemistry, chemistry, and biochemistry), water chemistry in nuclear engineering, cancer therapy, industrial application of radiation, interfaces

Advanced Modeling & Simulation

Advanced
Modeling &
Simulation

Ryoichi KOMIYAMA Associate Professor

Ryoichi KOMIYAMAAssociate Professor

1975
komiyama@n.t.u-tokyo.ac.jp

Website

Quantitative Analysis of Energy Security

Energy security is a key agenda to address for sustaining socioeconomic activities under various structural and contingency risks such as the depletion of fossil fuel and energy supply disruption. In order to formulate effective technical and political measures for enhancing energy security under those risks and constraints, we need to comprehensively understand economics and international energy market as well as the engineering aspect of energy technology. The research theme in our group is to develop a mathematical and computational energy-economic model to analyze the optimal strategy for the deployment of energy technologies and to discuss energy policy firmly based on the simulated results derived from the model.

Department/Institute/Research Center

Main post:Department Nuclear Engineering and Management
Other posts:Resilience Engineering Research Center(講義)

Keywords

Energy security, Energy-economic model, Mathematical optimization, Econometrics

Advanced
Modeling &
Simulation

Mikio SAKAI Associate Professor

Mikio SAKAIAssociate Professor

1973
mikio_sakai@n.t.u-tokyo.ac.jp

Website

Multiphysics modeling for computational granular dynamics

We study multiphysics modeling for computational granular dynamics, namely, numerical simulations of solid-fluid and solid particle-elastic body interaction problems. We encounter these problems in various fields including nuclear engineering, chemical engineering, mechanical engineering, civil engineering, pharmaceutical, etc. Numerical studies on the problems were challenging since these were hardly simulated because of the complicated phenomena and excessive calculation cost. Accordingly, our research topics becomes wide ranging, for example, slurry suspension, magneto-rheological fluids, fluidized beds, debris flows, slope failure. At present, we develop new models to perform the simulations by using Lagrangian-Lagrangian or Eulerian-Lagrangian approaches. Our original technologies become important in engineering and science.

Department/Institute/Research Center

Main post:Resilience Engineering Research Center
Other posts:Department Nuclear Engineering and Management、Imperial College London (Visiting Associate Professor)

Keywords

Computational granular dynamics, Discrete element method, Multiphiscs modeling

Advanced
Modeling &
Simulation

Takeshi SATO Associate Professor

Takeshi SATOAssociate Professor

1980
sato@atto.t.u-tokyo.ac.jp

Website

Multielectron dynamics in intense laser fields

High field physics and attosecond science are rapidly progressing, in which dynamics of electrons in matters are directly measured and even controlled, using ultra-short high-intensity laser pulses. We are developing state-of-the-art theoretical and computational methods to solve time-dependent Schrödinger equation of multielectron systems interacting with intense laser fields, aiming at ab initio study of nonlinearly nonperturbative phenomena such as tunneling ionization, high harmonic generation, and nonsequential multiple ionization.

Department/Institute/Research Center

Main post:Department Nuclear Engineering and Management
Other posts:Photon Science Center

Keywords

High field physics, Attosecond science, Wave function theory, Density functional theory, Quantum chemistry

Advanced
Modeling &
Simulation

Yasumasa FUJII Professor

Yasumasa FUJIIProfessor

1965
fujii@n.t.u-tokyo.ac.jp

Website

Energy Systems Analysis for Policy and Technology Assessment

Fujii laboratory has been working on the research topics of the feasibility analysis of various alternative energy supply technologies, and policy evaluation for international energy security and environmental issues using a global energy system model built with large-scale mathematical programming on the computers. Moreover, research topics of energy management, such as institutional design of deregulated electricity markets and optimal strategy planning of energy procurement under uncertainty, have also been investigated using variety of analytical techniques of stochastic dynamic programming, financial engineering, and multi-agent simulation with reinforcement learning.
In Fujii laboratory, since we try to find the solutions for the energy problems of 100 years and for the social system which is not realized yet, we welcome students who have the interest to learn various fields, and those who have strong imagination to consider the future of foreign countries.

Department/Institute/Research Center

Main post:Department Nuclear Engineering and Management
Other posts:Resilience Engineering Research Center

Keywords

Energy Economic Systems, Technology and Policy Assessment, Optimization, Stochastic Programming

Materials in Extreme Environments

Materials in
Extreme
Environments

Hiroaki ABE Professor

Hiroaki ABEProfessor

1966
abe.hiroaki@n.t.u-tokyo.ac.jp

Nuclear Materials Engineering

As one of the expected solutions for the safe design and operation of nuclear power plants, the further improvements of nuclear materials and fuels are indispensable. We deal with research and development of materials for fusion reactors, advanced fission reactors (Generation IV), and current light water reactors (LWR). The main aspects are to reveal fundamental mechanism of the degradation process under extreme environments, such as irradiation, corrosion and hydrogenation, in Fe-based and Zr-based alloys. Developments of high-performance materials and testing methods are also of our interest. The following techniques are currently applied: microscopy like TEM, HVEM, TEM-accelerator, SEM/EBSD etc.; mechanical tests like advanced expansion-due-to-compression (A-EDC) test, tensile, creep and nano-hardness etc.; and computer simulations like FEM and MD.

Department/Institute/Research Center

Main post:Nuclear Professional School
Other posts:Department Nuclear Engineering and Management

Keywords

Fission, Fusion, Nuclear materials, Nuclear fuels, Extreme environment, Degradation mechanism, Radiation effects

Materials in
Extreme
Environments

Dongyue CHEN Project Lecturer

Dongyue CHENProject Lecturer

1987
dychen@safety.n.t.u-tokyo.ac.jp

Website

Ageing Management and Performance of Nuclear Materials

Ageing degradation of nuclear materials is one of the key issues for the safe operation of nuclear power plants. As an important step to achieve reliable and proactive ageing management of nuclear materials, we combine both experimental and modeling measures to study their ageing mechanisms at multiple scales. Our interests focus on the key materials in reactors, for example core structural materials, reactor pressure vessel steels and fuel cladding materials. State-of-the-art techniques, such as in-situ TEM (Transmission Electron Microscopy) and APT (Atom Probe Tomography), are utilized to analyze the evolution of irradiation defects. Based on the ageing mechanisms, the behaviors of nuclear materials in normal operation and accident conditions are predicted quantitatively, which could play an essential role on the safety of nuclear energy.

Department/Institute/Research Center

Main post:Department Nuclear Engineering and Management

Keywords

Ageing management, Nuclear materials, Irradiation defects.

Current Students

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