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Aoyama, Michio*; Yamazawa, Hiromi*; Nagai, Haruyasu
Nihon Genshiryoku Gakkai-Shi ATOMO
, 60(1), p.46 - 50, 2018/01
no abstracts in English
Kudo, Tamotsu; Hidaka, Akihide*; Fuketa, Toyoshi
Proceedings of 2005 Water Reactor Fuel Performance Meeting (CD-ROM), p.883 - 889, 2005/10
The VEGA program have been performed at Japan Atomic Energy Research Institute (JAERI). The program was comprised of series of experiments on radionuclides release from fuel under severe accident conditions and post-test evaluation with numerical calculations. Effects on the release of ambient pressure, fuel temperature, inert or steam environment and MOX-effect were studied in the program. These effects had been hardly investigated in previous studies due to difficulties in experiments with high temperature and pressure conditions. Release of cesium was mitigated at elevated pressure in comparison with atmospheric pressure. Cesium release was enhanced in the temperature region where fuel foaming occurred below the melting point of UO
. Release of cesium and ruthenium under steam condition was greater than that under the inert helium condition. Released mass of plutonium above 2800 K was higher by nearly three orders of magnitude than that in lower temperature than 2800 K.
Nishi, Tsuyoshi; Takano, Masahide; Ito, Akinori; Akabori, Mitsuo; Minato, Kazuo; Kizaki, Minoru
JAERI-Tech 2005-051, 13 Pages, 2005/09
JAERI-Tech-2005-051.pdf:1.38MB
An apparatus has been developed to measure the thermal diffusivities of minor actinide (MA) compounds. By installing the laser flash apparatus in a glove box with highly purified inert gas atmosphere, the thermal diffusivities measurement of MA compounds of 
-decay nuclides was enabled. A new sample holder has been also developed to measure the thermal diffusivities of very small samples. The performance of this new apparatus was confirmed by measuring the thermal diffusivities of small samples of tantalum, nickel and cerium oxides. The thermal diffusivity values obtained in this work agreed well with the literature values and the values measured by a conventional thermal diffusivities measurement apparatus. Accordingly, this apparatus was found to be useful for thermal diffusivities measurement of MA compounds.
exchange processes; SOLVEG2Nagai, Haruyasu
RIST News, (39), p.10 - 22, 2005/03
A new atmosphere-soil-vegetation model named SOLVEG2 (SOLVEG version 2) was developed to study the heat, water, and CO exchanges between the atmosphere and land-surface. The model consists of one-dimensional multilayer sub-models for the atmosphere, soil, and vegetation. It also includes sophisticated processes for solar and long-wave radiation transmission in vegetation canopy and CO exchanges among the atmosphere, soil, and vegetation. Although the model usually simulates only vertical variation of variables in the surface-layer atmosphere, soil, and vegetation canopy by using meteorological data as top boundary conditions, it can be used by coupling with a three-dimensional atmosphere model.
exchange processes; SOLVEG2Nagai, Haruyasu
JAERI-Data/Code 2004-014, 92 Pages, 2004/11
JAERI-Data-Code-2004-014.pdf:11.03MB
A new atmosphere-soil-vegetation model named SOLVEG2 (SOLVEG version 2) was developed to study the heat, water, and CO exchanges between the atmosphere and land-surface. The model consists of one-dimensional multilayer sub-models for the atmosphere, soil, and vegetation. It also includes sophisticated processes for solar and long-wave radiation transmission in vegetation canopy and CO exchanges among the atmosphere, soil, and vegetation. The model can be also used by coupling with a three-dimensional atmosphere model. In this paper, details of SOLVEG2, which includes the function of coupling with atmosphere model MM5, are described.
Yokoyama, Sumi; Noguchi, Hiroshi; Ichimasa, Yusuke*; Ichimasa, Michiko*
Journal of Environmental Radioactivity, 71(3), p.201 - 213, 2004/01
Times Cited Count：10 Percentile：22.56(Environmental Sciences)The reemission process of tritiated water (HTO) deposited on a soil surface is an important process to assess tritium doses to the general public around nuclear fusion facilities. A field experiment using heavy water (HDO) as a substitute for HTO was curried out in the summertime to investigate the reemission process of HTO from soil to the atmosphere. In the experiment, the time variations of the depth profiles of HDO concentrations in soil exposed to HDO vapour and soil mixed with HDO were measured during the reemission process on the field. The decrease of HDO concentration insoil water of exposed soil was much greater than that of mixed soil. The reemission process was analysed using a model including the evaporation of HDO from soil, the exchange between the soil HDO and air HO, and the diffusion of HDO in soil. It was found that the model is applicable to calculating the time variations of detailed depth profiles of HDO concentration in soil water in surface soil layers.
Nagai, Haruyasu
JAERI-Data/Code 2003-021, 36 Pages, 2003/12
JAERI-Data-Code-2003-021.pdf:1.73MB
A new method to couple atmosphere and land-surface models using the massage passing interface (MPI) was proposed to develop a atmosphere-land model for studies on heat, water, and material exchanges at around the land surface. A non-hydrostatic atmospheric dynamic model of Pennsylvania State University and National Center for Atmospheric Research (PUS/NCAR-MM5) and a detailed land surface model (SOLVEG) including the surface-layer atmosphere, soil, and vegetation developed at Japan Atomic Energy Research Institute (JAERI) are used as the atmosphere and land-surface models, respectively. Concerning the MPI, a message passing library named Stampi developed at JAERI that can be used between different parallel computers is used. The models are coupled by exchanging calculation results by using MPI on their independent parallel calculations.
Noguchi, Hiroshi; Yokoyama, Sumi*
Health Physics, 84(3), p.344 - 353, 2003/03
Times Cited Count：1 Percentile：10.88(Environmental Sciences)no abstracts in English
Yamazawa, Hiromi
Environmental Modelling & Software, 16(8), p.739 - 751, 2001/12
no abstracts in English
Lee, S.; Chino, Masamichi
Keisan Kogaku Koenkai Rombunshu, 5(1), p.373 - 376, 2000/05
no abstracts in English
O+SO
atmosphereKurata, Yuji; Suzuki, Tomio; Shimizu, Saburo
JAERI-Research 2000-011, p.56 - 0, 2000/03
JAERI-Research-2000-011.pdf:14.24MB
no abstracts in English
Yamazawa, Hiromi
KURRI-KR-61, p.100 - 105, 2000/00
no abstracts in English
Nagai, Haruyasu; Chino, Masamichi; Yamazawa, Hiromi
Nihon Genshiryoku Gakkai-Shi, 41(7), p.777 - 785, 1999/07
Times Cited Count：13 Percentile：68.53(Nuclear Science & Technology)no abstracts in English
Yokoyama, Sumi; Noguchi, Hiroshi; Fukatani, S.; Ichimasa, Michiko*; Ichimasa, Yusuke*
Fusion Engineering and Design, 42, p.141 - 148, 1998/00
Times Cited Count：3 Percentile：31.85(Nuclear Science & Technology)no abstracts in English
Rn concentration model using a hydrodynamic meteorological model,1; One dimensional practical modelChino, Masamichi; Yamazawa, Hiromi; Iida, Takao*
Health Physics, 70(1), p.47 - 54, 1996/01
Times Cited Count：3 Percentile：32.72(Environmental Sciences)no abstracts in English
Rn concentration model using a hydrodynamic meteorological model,2; Three-demensional research-purpose modelChino, Masamichi; Yamazawa, Hiromi
Health Physics, 70(1), p.55 - 63, 1996/01
Times Cited Count：6 Percentile：50.18(Environmental Sciences)no abstracts in English
Chino, Masamichi; Ishikawa, Hirohiko; Yamazawa, Hiromi; ; Moriuchi, Shigeru
JAERI 1334, 54 Pages, 1995/09
no abstracts in English
microspheres; Takahashi, Yoshihisa
Journal of Nuclear Materials, 207, p.255 - 265, 1993/00
Times Cited Count：6 Percentile：55.97(Materials Science, Multidisciplinary)no abstracts in English
Sr using liquid scintillation counting techniquesAmano, Hikaru
Proc. of the 4th Int. Seminor of Liquid Scintillation Analysis, p.236 - 245, 1991/00
no abstracts in English
Chino, Masamichi
Nihon Genshiryoku Gakkai-Shi, 32(11), p.1080 - 1086, 1990/11
Times Cited Count：0 Percentile：0.02(Nuclear Science & Technology)no abstracts in English
