It is important to understand or
evaluate a heat and fluid transport phenomena (thermal-hydraulic
phenomena) for performing thermal design of light
water reactors (LWRs), formulate accident management plans and
design of new safety equipment of LWRs. The present thermal
design of nuclear reactors is performed based on the
experimental data obtained by mock-up test facilities. However,
in such a case, a large amount of fund and human resources are
required for construction and maintenance of experimental
facilities.
With the progress of the performance of computers and numerical
simulation techniques, numerical simulation based on
computational fluid dynamics (CFD) is applied
to designs in many engineering fields. By applying CFD to
designs of the LWRs, reducing or neglecting of the necessities
of mock-up test facilities will be achieved. However,
application of the CFD to designs of LWRs is very difficult,
because the LWR system is very large, and complicated flow, such
as gas-liquid two-phase flow and multi-phase flow, appears in
the LWRs.
For the establishment of thermal-hydraulics numerical simulation
method for large-scale two-phase flow and multi-phase flow, we
are developing two-phase flow and multi-phase flow
numerical simulation codes for large-scale computers,
performing thermal-hydraulics experiments to construct
validation databases and developing measurement
techniques for performing these experiments. These
developed techniques are applied to the research works for
improving the safety of the LWRs and considering the
decommissioning process of the Fukushima-Daiichi NPS.
Call for entries: Recruitment for new graduate in 2020 -Researcher- Detail
T. Misawa, et al., Development of an Analytical Method on Water-Vapor Boiling Two-Phase FlowCharacteristics in BWR Fuel Assemblies Under Earthquake Condition, Nuclear Reactor, Intech, (2012)
K.Takase, et al., Numerical Visualization on Melting and Solidification of Micron-sized Metallic Particles by Laser Irradiation, Quarterly Journal of the Japan Welding Society 、Vol.29, No.3,(2011) pp43-47 (in Japanese)
T. Nakatsuka, et al., Study on Effect of Local Power Distribution of Fuel Assembly on Critical Power of Reduced-Moderation Water Reactor (RMWR), Transactions of the Atomic Energy Society of Japan, Vol 9, No. 2, (2010) (in Japanese)
H. Yoshida, T. Misawa, T. Suzuki and K.Takase, Current Status of Development of Thermal Hydraulic Design Method for Accelerator Driving System in JAEA, Proc. of TCADS1, (2010)
H. Yoshida, H. Hosoi, T. Suzuki and K. Takase, Development of Advanced Two-fluid Model for Boiling Two-phase Flow in Rod Bundles, Proc. of ICONE18, ICONE18-30219, (2010)
T. Nakatsuka, et al., Numerical Simulations on Turbulent Heat Transfer Characteristics of Supercritical Pressure Fluids, IMECE2009-12710, USA, (2009)
K. Takase, et al., Computational Simulations on Melting Process on Fine Metal Powders with Laser Irradiation Welding, IMECE2009-13219, USA, (2009)
T. Misawa, T. Nakatsuka, H. Yoshida, K. Takase, K. Ezato, Y. Seki, M. Dairaku, S. Suzuki, M. Enoeda, Heat Transfer Experiments and Numerical Analysis of Supercritical Pressure Water in Seven-rod Test Bundle, Proc. of NURETH-13, N13P1437 (2009)
Involvement
in the Innovative and Viable Nuclear Energy Technology (IVNET)
Development Project, "Development of Supercritical Water-Cooled
Reactor in GIF Collaboration (Phase-I)", funded by the Ministry
of Economy, Trade and Industry (METI) in cooperation with other
organizations since FY 2008. Here, our group takes charge of
development of a thermal-hydraulic analysis method in SCWR by
CFD. Please refer the following WEB site:
http://www.iae.or.jp/KOUBO/innovation/theme/h20/H20_b3.html
Japan science and technology agency, Nnuclear fundamental strategy research initiative project, Strategic nuclear energy joint research program, “Study on the advancement in detailed prediction technology of two-phase flow at addition of earthquake acceleration,” (2010).