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Ono, Ayako; Tanaka, Masaaki; Miyake, Yasuhiro*; Hamase, Erina; Ezure, Toshiki
Mechanical Engineering Journal (Internet), 7(3), p.19-00546_1 - 19-00546_11, 2020/06
Fully natural circulation decay heat removal systems (DHRSs) are to be adopted for sodium fast reactors, which is a passive safety feature without any electrical pumps. It is required to grasp the thermal-hydraulic phenomena in the reactor vessel and evaluate the coolability of the core under the natural circulation not only for the normal operating condition but also for severe accident conditions. In this paper, the numerical results of the preliminary analysis for the sodium experimental condition with the PLANDTL-2 are discussed to establish an appropriate numerical models for the reactor core including the gap region among the subassemblies and the DHX. From these preliminary analyses, the characteristics of the thermal-hydraulics behavior in the PLANDTL-2 to be focused are extracted.
Ono, Ayako; Tanaka, Masaaki; Miyake, Yasuhiro*; Hamase, Erina; Ezure, Toshiki
Proceedings of 27th International Conference on Nuclear Engineering (ICONE-27) (Internet), 7 Pages, 2019/05
Decay heat removal system (DHRS) by using the natural circulation without depending on the pump as the mechanical equipment is recognized as one of the most effective methodologies for the sodium-cooled fast reactor from the viewpoint of the safety enhancement. In this paper, the numerical simulation results of the preliminary analysis for the sodium experiment with the apparatus of PLANDTL-2, in which the core and the upper plenum with a dipped-type direct heat exchanger (DHX) were modeled, were discussed, in order to establish appropriate numerical models for the reactor core including the gap region among the subassemblies and the DHX.
Shen, X.*; Schlegel, J. P.*; Hibiki, Takashi*; Nakamura, Hideo
Proceedings of 2017 Japan-US Seminar on Two-Phase Flow Dynamics (JUS 2017), 6 Pages, 2017/06
Ida, Masato
Journal of the Physical Society of Japan, 73(11), p.3026 - 3033, 2004/11
Times Cited Count:8 Percentile:48.25(Physics, Multidisciplinary)The theoretical results regarding the "transition frequencies" of two acoustically interacting bubbles have been verified numerically. The theory provided by Ida [Phys Lett A (2002)] predicted the existence of three transition frequencies per bubble, each of which has the phase difference of between a bubble's pulsation and the external sound. In a subsequent paper [Phys Rev E (2003)], it was shown theoretically that transition frequencies may cause the sign reversal of the secondary Bjerknes force. In this paper, we employ a DNS technique to verify those results. The numerical results reproduce the theoretical predictions, validating the existence of the transition frequencies.
Kataoka, Isao*; Matsuura, Keizo*; Yoshida, Kenji*
JAERI-Tech 2002-015, 83 Pages, 2002/03
no abstracts in English
Nishimura, Akihiko; Shibata, Takemasa
Journal of Nuclear Science and Technology, 32(9), p.905 - 911, 1995/09
Times Cited Count:2 Percentile:28.04(Nuclear Science & Technology)no abstracts in English
Yokokawa, Mitsuo;
Joho Shori Gakkai Kenkyu Hokoku, 93(33), p.37 - 44, 1993/04
no abstracts in English
Nishimura, Akihiko; ; Oba, Hironori; Shibata, Takemasa
Journal of Nuclear Science and Technology, 30(3), p.270 - 273, 1993/03
Times Cited Count:13 Percentile:84.31(Nuclear Science & Technology)no abstracts in English
;
Journal of Nuclear Science and Technology, 20(6), p.503 - 510, 1983/00
Times Cited Count:3 Percentile:44.31(Nuclear Science & Technology)no abstracts in English