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Hanaki, Tatsumi; Nagasaki, Yasushi; Suzuki, Hajime
JAEA-Technology 2012-002, 8 Pages, 2012/03
JAEA-Technology-2012-002.pdf:2.35MB
In the "Plan for meeting the midterm goal (Midterm plan, April 1st, 2010 to March 31st, 2015)" by JAEA, it is planned that the closure activities of the Tono Mine will be started during the period of the Midterm plan. The closure activities at the Tono Mine were reviewed and "Plan for Closure Activities of the Tono Mine; Mine Closure Activities under Review" was developed in June 2010. This report presents detailed closure activities of the facilities and equipment of the Tono Mine.
Isayama, Akihiko; Sakakibara, Satoru*; Furukawa, Masaru*; Matsunaga, Go; Yamazaki, Kozo*; Watanabe, Kiyomasa*; Idomura, Yasuhiro; Sakamoto, Yoshiteru; Tanaka, Kenji*; Tamura, Naoki*; et al.
Purazuma, Kaku Yugo Gakkai-Shi, 86(6), p.374 - 377, 2010/06
no abstracts in English
Osakabe, Masaki*; Shinohara, Koji; Toi, Kazuo*; Todo, Yasushi*; Hamamatsu, Kiyotaka; Murakami, Sadayoshi*; Yamamoto, Satoshi*; Idomura, Yasuhiro; Sakamoto, Yoshiteru; Tanaka, Kenji*; et al.
Purazuma, Kaku Yugo Gakkai-Shi, 85(12), p.839 - 842, 2009/12
no abstracts in English
Idomura, Yasuhiro; Yoshida, Maiko; Yagi, Masatoshi*; Tanaka, Kenji*; Hayashi, Nobuhiko; Sakamoto, Yoshiteru; Tamura, Naoki*; Oyama, Naoyuki; Urano, Hajime; Aiba, Nobuyuki; et al.
Purazuma, Kaku Yugo Gakkai-Shi, 84(12), p.952 - 955, 2008/12
no abstracts in English
Oe, Toshiaki*; Nagasaki, Shinya*; Kimura, Hideo; Takeda, Seiji; Sekioka, Yasushi; Kato, Hiroyasu*
Nihon Genshiryoku Gakkai Wabun Rombunshi, 7(3), p.194 - 209, 2008/09
Sorption coefficients complied in a database have been checked for the sake of keeping the consistency. Major factors affecting the data scatter were examined by applying the mechanistic sorption models such as ion exchange and/or surface complexation models for the case of bentonite, clay minerals, and rock samples. The results suggested there were few data sets that were enough for the analysis by the later model. The sorption coefficients of neptunium or selenium on quartz and neptunium, tin and uranium on bentonite covers wide pH range and can be applicable for the extended analysis by the surface comlexation model. As for the case of cesium that is the key elements in performance analysis, the experimental condition such as ionic strength, mixture of sand are of great importance. Procedures were examined to speculate the parameters, which are not explicitly indicated in the data base and necessarily used in the ion exchange model, to reduce the variance of the sorption data.
Oe, Toshiaki*; Nagasaki, Shinya*; Kimura, Hideo; Takeda, Seiji; Sekioka, Yasushi; Kato, Hiroyasu*; Akahori, Kuniaki*
Nihon Genshiryoku Gakkai Wabun Rombunshi, 7(3), p.210 - 220, 2008/00
Uncertainty found in the statistical data of Cs sorption coefficients was investigated. Careful data treatment indicated the major reason of data scatter was caused by the differences of the concentrations of co-existing ions and initial Cs concentrations. Analysis of the pH dependence of the data by adopting PHREEQC or MINEQL-TO which enable to treat ion exchange model coupled with the surface complexation model indicated the sorption coefficients could be represented for both cases obtained by batch method and diffusion method. In this analysis the same data set was used even for the extremely different experimental setup and the perturbation of environmental condition such as the Na concentration and pH brought strong influence on the data stability. The results also suggested that the scatter of the Cs sorption coefficient could be understandable and minimized through the analysis adopting mechanistic sorption model.
Yoshikawa, Kiyoshi*; Takiyama, Ken*; Onishi, Masami*; Yamamoto, Yasushi*; Nagasaki, Kazunobu*; Masuda, Kai*; Toku, Hisayuki*; Horiike, Hiroshi*
JAERI-Tech 2005-006, 116 Pages, 2005/03
JAERI-Tech-2005-006.pdf:24.79MB
no abstracts in English
Okawachi, Yasushi; Maeda, Shigetaka; Nagasaki, Hideaki*; Sekine, Takashi
JNC TN9400 2003-029, 96 Pages, 2003/04
The (JOYO) MK-II core characteristics database was compiled and published in 1998. Comments and requests from many users led to the creation of a revised edition in 2001. The revisions include changes to the MAGI calculation code system to use the 70 group JFS-3-J3.2 constant set processed from the JENDL-3.2 library. However, after the database was published, it was recently found that there were errors in the process of making the group constant set JFS-3-J3.2, and lt was revised at JFS-3-J3.2R. Then, the group constant set was updated at JFS-3-J3.2R in this database. The MK-II core management data and core characteristics data were recorded on CD-ROM for user convenience. The structure of the database is the same as in the first edition. The (configuration Data) include the core arrangement and refueling record for each operational cycle. The (Subassembly Library Data) include the atomic number density, neutron fluence, burn-up, integral power of 362 driver fuel subassemblies and 69 irradiation test subassemblies. The (Output Data) contain the calculated neutron flux, gamma flux, power density, linear heat rate, coolant and fuel temperature distribution of all the fuel subassemblies at the beginning and end of each operational cycle. The (Core Characteristics Data) include the measured excess reactivity, control rod worth calibration curve, and reactivity coefficients of temperature, power and burn-up. The effect of updating the group constant set, the calculation results excess reactivity decreased by about 0.15 delta-k/kk', and the effects to other core characteristics were negligible.
Okawachi, Yasushi; Maeda, Shigetaka; Sekine, Takashi; Nagasaki, Hideaki*
JNC TN9400 2002-070, 49 Pages, 2003/01
JNC-TN9400-2002-070.pdf:1.78MB
As part of the JOYO upgrading program (MK-III program), the JOYO MK-III core management code system "HESTIA" was developed in order to improve the calculation accuracy concerning the core and fuel management and irradiation condition evaluation in the MK-III core. The neutronic calculation of HESTIA was modified to improve the power and neutron flux distribution. The calculation geometry was changed to Tri-Z geometry from Hex-Z geometry which was used in the MK-II core management code system "MAGI". The number of calculation mesh per subassembly was increased to 24 meshes in the radial direction, and the fuel region was divided into 20 meshes in the axial direction. The number of neutron energy group was increased from 7 to 18, and that of gamma energy group was increased from 3 to 7 groups respectively. As a result, HESTIA can accurately calculate the local neutron flux distribution and spectrum change within the fuel subassembly at the boundary between the fuel and reflector regions, which can not be fully simulated by MAGI. It was also confirmed that HESTIA can improve the power distribution in the driver fuel subassembly adjacent to radial reflector. As to thermo-hydraulic calculation, the porous body model was adopted to improve the calculation accuracy of coolant temperature. This model can take into account the detailed power distribution and the turbulent heat transfer in a fuel subassembly. It was found that the calculated value by HESTIA agreed well with that of the subchannel model. In order to verify the calculation accuracy of HESTIA, JOYO MK-II core characteristics calculation was conducted using HESTIA, and calculation results were compared with those of MAGI. The MAGI calculation results were already confirmed by the core performance test and post irradiation examination data. The comparison of both calculation code systems showed that the excess reactivity agreed within 0.01 % 
k/kk', the maximum neutron flux agreed within 3%, the ...
Ishido, Akio*; Hasegawa, Ken*; Hanaki, Tatsumi*; Ochiai, Yoji*; Shigeta, Naotaka*; Nagasaki, Yasushi*
JNC TN7400 2005-022, 224 Pages, 1996/04
JNC-TN7400-2005-022.PDF:9.36MB
None
Tsubota, Koji*; Ochiai, Yoji*; Hasegawa, Ken*; Nagasaki, Yasushi*; Yamagishi, Akiko*; Nakano, Katsushi*; Muneto, Masaru*
JNC TN7400 2005-021, 166 Pages, 1995/04
JNC-TN7400-2005-021.PDF:7.06MB
None
Hasegawa, Ken*; Koide, Kaoru*; Muneto, Masaru*; Nagasaki, Yasushi*; Nakano, Katsushi; Yamagishi, Akiko*; Okita, Masatoshi*
JNC TN7400 2005-020, 199 Pages, 1994/04
JNC-TN7400-2005-020.PDF:11.68MB
None
Tsubota, Koji*; Ochiai, Yoji*; Hanaki, Tatsumi*; Hasegawa, Ken*; Okita, Masatoshi*; Koide, Kaoru*; Nagasaki, Yasushi*
JNC TN7400 2005-019, 114 Pages, 1993/04
JNC-TN7400-2005-019.PDF:7.46MB
None
Okita, Masatoshi*; Muneto, Masaru*; Hasegawa, Ken*; Nagasaki, Yasushi*; Koide, Kaoru*; Yamagishi, Akiko*; Semba, Tsuyoshi
JNC TN7400 2005-018, 241 Pages, 1992/04
JNC-TN7400-2005-018.PDF:10.21MB
None
Aoki, Katsunori; Ogura, Hideki; Ogata, Nobuhisa; Ikeda, Koki; Nagasaki, Yasushi; Tsurudome, Koji; Furuta, Sadaaki*
no journal, ,
no abstracts in English
Sekioka, Yasushi; Takeda, Seiji; Kimura, Hideo; Yamaguchi, Tetsuji; Oe, Toshiaki*; Nagasaki, Shinya*; Sasaki, Takayuki*; Kozaki, Tamotsu*; Inagaki, Yaohiro*
no journal, ,
no abstracts in English
Oe, Toshiaki*; Nagasaki, Shinya*; Kimura, Hideo; Takeda, Seiji; Sekioka, Yasushi; Kato, Hiroyasu*; Akahori, Kuniaki*
no journal, ,
no abstracts in English
Oe, Toshiaki*; Nagasaki, Shinya*; Kimura, Hideo; Takeda, Seiji; Sekioka, Yasushi; Kato, Hiroyasu*
no journal, ,
no abstracts in English
Aoki, Katsunori; Ogura, Hideki; Kubota, Mitsuru; Tsurudome, Koji; Ikeda, Koki; Nagasaki, Yasushi; Ogata, Nobuhisa; Furuta, Sadaaki*
no journal, ,
no abstracts in English
Abe, Hironobu; Ikeda, Koki; Mikake, Shinichiro; Nagasaki, Yasushi; Niizato, Tadafumi; Asazuma, Shinichiro; Aoki, Isao; Ishikawa, Nobuyuki; Ishikawa, Hiroyasu; Ishizaki, Nobuhiro; et al.
no journal, ,
no abstracts in English
