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Researcher information
Teppei OTSUKA Last modified date：2013.5.22

Assistant Professor / High Density Energy Science
Department of Engineering Science
Faculty of Engineering Sciences


Graduate School
Department of Advanced Energy Engineering Science
Interdisciplinary Graduate School of Engineering Sciences
Undergraduate School
Department of Energy Science and Engineering
School of Engineering


E-Mail
Homepage
[URL].
Phone
092-642-4139
Fax
092-642-4139
Academic Degree
Doctor in Engineering
Field of Specialization
Nuclear fission materials, Nuclear fusion materials, Tritium science and technology, hydrogen energy science and technology
Outline Activities
It is well known that mechanical properties of materials are degraded by hydrogen, so called “Hydrogen embrittlement of materials” which is plausibly caused by “localization” so as to be enough high to weak atomic bonding of materials followed by “migration” of a tiny amount of hydrogen in materials. However, “Driving force” for hydrogen migration and “particular site” for localization in materials are still not clarified. One of my research fields is applying “Tritium tracer techniques” to visuallize hydrogen behaviors in materials under various potential differences (concentration, strain/stress, heat and electric potential). In this case, tritium concentration in hydrogen is a tracer level, i.e. ppm order. Another research field is to clarify mechanisms of contamination or removal of tritium in materials with respect to physical parameters such as temperature and tritium concentration. Radioactive tritium itself become problem when tritium concentration increases. Understanding mechanisms of tritium contamination of materials or removal of tritium from materials is very important issue for a fission and a future fusion safety. In order to develop efficient tritium removal systems from tritium contaminated materials, it is needed to take advantage of knowledge of hydrogen-materials interactions and do further experiments for beta electron emissions and isotopic exchange reaction of tritium. I aim to change accumulated know-how for tritium contamination or removal from materials to be sophisticated and academic phenomenon based on models with physical parameters like temperature, concentration and their dependencies of hydrogen-materials interactions.
Research
Research Interests
  • Behaviors of hydrogen isotopes on the surface and in the bulk of nuclear fusion materials
    keyword : Tritium, Hydrogen, Diffusion, Trapping
    2008.04.
  • Profiling of hydrogen in steels
    keyword : Tritium autoradiography, high strength steel, hydrogen embrittlement, delayed fracture, fatigue fracture
    2003.04.
  • The effect of additive element on crystallization of amorphous zirconia
  • The development mechanism of hydrophilic Zircaloy oxide film
  • Instrumented Charpy test of Zircaloy
Academic Activities
Papers
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1. T. Otsuka, T. Tanabe, K. Tokunaga,Behavior of tritium in plasma-sprayed tungsten coating on steel exposed to tritium plasma,Physica Scripta,Vol.T145,pp.014035,2011.12.
2. Takahiro Ikeda, Teppei Otsuka, Tetsuo Tanabe,Hydrogen permeation in metals near room temperature by a tritium tracer technique,Journal of Nuclear Materials,Vol.417,pp.568-571,2011.08.
3. T. Otsuka, M. Shimada, T. Tanabe and J. P. Sharpe,Behavior of tritium near surface region of metals exposed to tritium plasma,Fusion Science and Technology,Vol.60,pp.1539-1542,2011.11.
4. P. Calderoni, J. Sharpe, M. Shimada, B. Denny, B. Pawelko, S. Schuetz, G. Longhurst, Y. Hatano, M. Hara, Y. Oya, T. Otsuka, K. Katayama, S. Konishi, K. Noborio, Y. Yamamoto,An overview of research activities on materials for nuclear applications at the INL Safety, Tritium and Applied Research facility,Journal of Nuclear Materials,Vol.417,pp.1336-1340,2011.01.
5. T. Otsuka, T. Tanabe, K. Tokunaga, N. Yoshida, K. Ezato, S. Suzuki, M. Akiba,Application of tritium tracer techniques to observation of hydrogen on surface and in bulk of F82H,Journal of Nuclear Materials,Vol.417,pp. 1135–1138,2011.10.
6. T. Otsuka, M. Shimada, R. Kolasinski, P. Calderoni, J.P. Sharpe, Y. Ueda, Y. Hatano, T. Tanabe,Application of tritium imaging plate technique to examine tritium behaviors on the surface and in the bulk of plasma-exposed materials,Journal of Nuclear Materials,Vol.415,pp.S769-S772,2011.08.
7. T. Ikeda, T. Otsuka and T. Tanabe,APPLICATION OF TRITIUM TRACER TECHNIQUE TO DETERMINATION OF HYDROGEN DIFFUSION
COEFFICIENTS AND PERMEATION RATE NEAR ROOM TEMPERATURE FOR TUNGSTEN ,Fusion Science and Technology,Vol.60,pp.1463-1466,2011.06.
8. T. Otsuka and T. Tanabe,Behavior of Tritium Accumulated on Materials Surface,Fusion Eng. Design,Vol.85,pp.1437-1441,2010.12.
9. T. Hoshihira, T. Otsuka, T. Tanabe,Visualization of hydrogen distribution around blisters by tritiumradio-luminography,Journal of Nuclear Materials,Vol.386–388,pp.776–779,2009.06.
10. T. Hoshihira, T. Otsuka, T. Tanabe,A study of hydrogen blistering mechanism for Molybdenum by Tritium radio-luminography, T. Hoshihira, T. Otsuka, T. Tanabe, J. Nucl. Mater. 390–391 (2009) 1029–1031,Journal of Nuclear Materials,No.390–391,1029–1031,2009.01.
11. T. Otsuka, T. Hoshihira and T. Tanabe,Visualization of hydrogen depth profile by means of tritium imaging plate technique: determination of hydrogen diffusion coefficient in pure tungsten,Phyisica Scripta,Vol.T136,pp.014052,2009.10.
12. T. Otsuka, S. Sasabe and T. Tanabe,Hydrogen diffusion in Fe–Ni alloys around room temperature,Journal of Nuclear Materials,Vol.386-388,pp.884-887,2009.04.
13. T.Otsuka and T. Tanabe, Tritium Release from Ferritic/Martensitic Stainless Steel,Fusion Science & Technology,Vol. 54, p. 541-544,2008.08.
14. Teppei OTSUKA and Tetsuo TANABE,Hydrogen Diffusion and Trapping Process around MnS precipitates in alpha Fe Examined by Tritium Autoradiography,Journal of Alloys and Compounds,446-447, p.655-659,2007.02.
15. T. Otsuka, T. Isotani, K. Nakayama, N. Morishige, K. Hashizume, M. Sugisaki, T. Tanabe,On the wettability change of oxidized and gamma irradiated Zircaloy,2005 Water Reactor Fuel Performance Meeting,2005.10.
16. Hitoshi Hanada, Teppei Otsuka, Hidehiko Nakashima, Shinji Sasaki, Masao Hayakawa, Masayasu Sugisaki,Profiling of Hydrogen Accumulation in a tempered martensite microstructure by means of Tritium Autoradiography,Scripta Materiallia,Vol.53,No.11,2005.01.
17. Teppei Otsuka, Hitoshi Hanada, Hidehiko Nakashima, Kan Sakamoto, Masanori Hayakawa, Masayasu Sugisaki,Observation of Hydrogen Distribution around Non-metallic Inclusions in Steels with Tritium Autoradiography,Fusion Science and Technology,Vol.48,No.1,48, 708-711,2005.08.
18. Seichi SATO, Teppei OTSUKA, Y. Kuroda, T. HIGASHIHARA and H. Ohashi,Diffusion of Helium in Water-Saturated, Compacted Sodium Montmorillonite,Journal of Nuclear Science and Technology,Vol.38,No.7,vol. 38, No. 7, pp. 577-580,2001.01.
Presentations
 Show All Presentations >>
1. Mechanism of hydrogen diffusion in Fe-Ni alloys.
2. Hydrogen accumulation and release processes around MnS in alpha iron by means of tritium autoradiography.


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