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Hidaka, Akihide; Kawashima, Shigeto*; Kajino, Mizuo*
Journal of Nuclear Science and Technology, 60(7), p.743 - 758, 2023/07
Times Cited Count：2 Percentile：87.3(Nuclear Science & Technology)An accurate estimation of radionuclides released during the Fukushima accident is essential. Therefore, authors investigated Te release using the Unit emission-regression estimation method, in which the deposition distribution is weighted based on the hourly deposition obtained from mesoscale meteorological model calculations assuming Unit emissions. The previous study focused on confirming the applicability of this method. Subsequent examination revealed that if any part of the time when a release have occurred is missing from the estimated release period, the entire source term calculation will be distorted. Therefore, this study performed the recalculation by extending the estimation period to cover all major releases. Consequently, unspecified release events were clarified, and their correspondence to in-core events was confirmed. The 
Te release caused by Zr cladding complete oxidation can explain the regional dependence of the Te/
Cs ratio in the soil contamination map.
Homma, Toshimitsu; Tomita, Kenichi*; Hato, Shinji*
Nuclear Engineering and Technology, 37(3), p.245 - 258, 2005/06
This paper addresses two types of uncertainty: stochastic uncertainty and subjective uncertainty in probabilistic accident consequence assessments. The off-site consequence assessment code OSCAAR has been applied to uncertainty and sensitivity analyses on the individual risks of early fatality and latent cancer fatality in the population due to a severe accident. A new stratified meteorological sampling scheme was successfully implemented into the trajectory model for atmospheric dispersion and the statistical variability of the probability distributions of the consequence was examined. A total of 65 uncertain input parameters was considered and 128 runs of OSCAAR were performed in the parameter uncertainty analysis. The study provided the range of uncertainty for the expected values of individual risks of early and latent cancer fatality close to the site. In the sensitivity analyses, the correlation/regression measures were useful for identifying those input parameters whose uncertainty makes an important contribution to the overall uncertainty for the consequence.
Nishizawa, Masato*; Chino, Masamichi
Taiki Kankyo Gakkai-Shi, 39(1), p.31 - 42, 2004/01
no abstracts in English
Ueno, Takashi; Matsunaga, Takeshi; Amano, Hikaru; Tkachenko, Y.*; Kovalyov, A.*; Sukhoruchkin, A.*; Derevets, V.*
JAERI-Data/Code 2002-024, 414 Pages, 2003/01
JAERI-Data-Code-2002-024.pdf:15.11MB
This report is a compilation of the shared data derived from the environmental monitoring by RADEK (The state Enterprise for Region Monitoring of Environment and Dosimetric Control of Ukraine) and the record of environmental characteristics derived from field observations during a research project (1992-1999) between JAERI (Japan Atomic Energy Research Institute) and CHESCIR (Chernobyl Science and Technology Centre for International Research). The compiled data in this report are especially related to one particular research subject (Subject-3) of the project on the migration of radionuclides released into the terrestrial and aquatic environments after a nuclear accident. The present report shows the basis of published works concerning Subject-3.
Liu, X.*; Tomita, Kenichi*; Homma, Toshimitsu
JAERI-Research 2002-004, 37 Pages, 2002/03
JAERI-Research-2002-004.pdf:2.14MB
One important step in Level 3 Probabilistic Safety Assessment is meteorological sequence sampling, on which the previous studies were mainly related to code systems using straight line plume model and more efforts are needed for trajectory puff model such as the OSCAAR code system. This report describes the development of a new meteorological sampling scheme for the OSCAAR code system that explicitly considers population distribution. A group of principles was set forth for the development of this new sampling scheme, including completeness, stratification, sample allocation, practicability and so on. The calculation results illustrate that although it is quite difficult to idealize stratification of meteorological sequences based on a few environmental parameters the new scheme do gather the most inverse conditions in a single subset of meteorological sequences. The size of this subset may be as small as a few dozens, so that the tail of a CCDF curve is possible to remain relatively static in different trials of the PCA code system.
Lee, S.; Kimura, Fujio*
Boundary-Layer Meteorology, 101(2), p.157 - 182, 2001/11
Times Cited Count：53 Percentile：74.53(Meteorology & Atmospheric Sciences)no abstracts in English
Liu, X.; Homma, Toshimitsu
JAERI-Tech 2001-054, 49 Pages, 2001/08
JAERI-Tech-2001-054.pdf:1.54MB
no abstracts in English
Noguchi, Hiroshi; Fukutani, Satoshi*; Yokoyama, Sumi*; Kinouchi, Nobuyuki
Radiation Protection Dosimetry, 93(2), p.167 - 172, 2001/00
Times Cited Count：7 Percentile：48.66(Environmental Sciences)no abstracts in English
Noguchi, Hiroshi; Fukutani, Satoshi*; Yokoyama, Sumi; Kinouchi, Nobuyuki
KURRI-KR-61, p.18 - 25, 2000/00
no abstracts in English
Chino, Masamichi; Nagai, Haruyasu; Furuno, Akiko; Kitabata, Hideyuki; Yamazawa, Hiromi
Proceedings of 10th International Congress of the International Radiation Protection Association (IRPA-10) (CD-ROM), 8 Pages, 2000/00
no abstracts in English
Homma, Toshimitsu; Liu, X.; Tomita, Kenichi*
Proceedings of 5th International Conference on Probabilistic Safety Assessment and Management (PSAM-5), p.2753 - 2758, 2000/00
no abstracts in English
Noguchi, Hiroshi; Yokoyama, Sumi; Fukatani, S.*; Kinouchi, Nobuyuki; Murata, Mikio; Amano, Hikaru; Atarashi-Andoh, Mariko
JAERI-Data/Code 99-022, 125 Pages, 1999/03
JAERI-Data-Code-99-022.pdf:6.76MB
no abstracts in English
S.J.Hu*; ; Kobayashi, Hideo
Health Physics, 61(6), p.831 - 835, 1991/12
Times Cited Count：2 Percentile：31.86(Environmental Sciences)no abstracts in English
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JAERI-M 86-097, 323 Pages, 1986/07
no abstracts in English
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JAERI-M 86-050, 45 Pages, 1986/03
no abstracts in English
; ; ; ;
JAERI-M 85-020, 46 Pages, 1985/03
no abstracts in English
1982); ; ; ;
JAERI-M 83-201, 40 Pages, 1983/11
no abstracts in English
; ; ; ;
JAERI-M 83-071, 130 Pages, 1983/05
no abstracts in English
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JAERI-M 9128, 129 Pages, 1980/10
no abstracts in English
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JAERI-M 8228, 62 Pages, 1979/05
no abstracts in English
