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Journal Articles

Thermodynamic study of gaseous CsBO$$_{2}$$ by Knudsen effusion mass spectrometry

Nakajima, Kunihisa; Takai, Toshihide; Furukawa, Tomohiro; Osaka, Masahiko

Journal of Nuclear Materials, 491, p.183 - 189, 2017/08

 Times Cited Count:7 Percentile:64.87(Materials Science, Multidisciplinary)

One of the main chemical forms of cesium in the gas phase during severe accidents of light water reactor is expected to be cesium metaborate, CsBO$$_{2}$$, by thermodynamic equilibrium calculation considering reaction with boron. But accuracy of the thermodynamic data of gaseous metaborate, CsBO$$_{2}$$(g), has been judged as poor quality. Thus, Knudsen effusion mass spectrometric measurement of CsBO$$_{2}$$ was carried out to obtain reliable thermodynamic data. The evaluated values of standard enthalpy of formation of CsBO$$_{2}$$(g), $$Delta$$$$_{f}$$H$$^{circ}$$$$_{298}$$(CsBO$$_{2}$$,g), by the 2nd and 3rd law treatments are -700.7$$pm$$10.7 kJ/mol and -697.0$$pm$$10.6 kJ/mol, respectively, and agree with each other within the errors, which suggests our data are reliable. Further, it was found that the existing data of the Gibbs energy function and the standard enthalpy of formation agreed well with the values evaluated in this study, which indicates the existing thermodynamic data are also reliable.

JAEA Reports

Development of measurement technique of the equilibrium vapor pressure of simulated fission products

Takai, Toshihide; Nakajima, Kunihisa; Furukawa, Tomohiro

JAEA-Technology 2015-002, 20 Pages, 2015/03

JAEA-Technology-2015-002.pdf:3.46MB

To improve the evaluation technique of source term, the measurement technique of the equilibrium vapor pressure using a high temperature mass spectrometer is required to expand the thermodynamic database of the simulated FPs. Existing test apparatus was adapted for this purpose. A mass spectrometer capable of measuring a wide mass number range and glove box for handling simulated FPs were installed for analyzing heavy FPs and preventing deterioration of simulated FPs in an air atmosphere, respectively. Function verification using standard sample and precision investigation using simulated FP sample were carried out. The oxygen dissociation pressure and standard enthalpy of formation of RuO$$_{2}$$(s) were evaluated, and it was confirmed these evaluated values were agreed with the calculated value from existing thermodynamic data and evaluation value written in the literature. Consequently, it was proven that high precision thermodynamic data was able to obtain by using this apparatus.

Journal Articles

Research program for the evaluation of fission product release and transport behavior focusing on FP chemistry

Sato, Isamu; Miwa, Shuhei; Tanaka, Kosuke; Nakajima, Kunihisa; Hirosawa, Takashi; Iwasaki, Maho; Onishi, Takashi; Osaka, Masahiko; Takai, Toshihide; Amaya, Masaki; et al.

Proceedings of 2014 Water Reactor Fuel Performance Meeting/ Top Fuel / LWR Fuel Performance Meeting (WRFPM 2014) (USB Flash Drive), 6 Pages, 2014/09

A new research program on severe accidents is lunched for the evaluation of FP release and transport behavior in BWR system. The purpose of the program is to improve the FP release and transport model using experimental database about FP chemistry focusing on Cs and I chemistry. In this program, effects of B including in control rod materials, B$$_{4}$$C for the Cs and I chemistry are paid attention. The experimental database used for the improvement will consist of results to obtain with newly-prepared test device under atmosphere with broad-ranging oxygen and/or steam partial pressure simulated those in BWR. The state of preparation for these experimental studies and analyses is introduced. In addition, the preliminary test was moved into action to show B chemical effect on Cs and I transport under one of the processes, which is deposited Cs compounds and B vapor and aerosol interaction. In this experiment, a "B stripping effect" to deposited CsI was observed.

Journal Articles

Microwave heating of solid Pu/U mixed nitrate medium in cylindrical cavity for nuclear fuel cycle

Imai, Suguru*; Nakajima, Yuki*; Taguchi, Kenji*; Kashiwa, Tatsuya*; Kitazawa, Toshihide*; Suzuki, Masahiro; Segawa, Tomomi; Fujii, Kanichi

Proceedings of 2011 International Symposium on Antennas and Propagation (ISAP 2011) (USB Flash Drive), 4 Pages, 2011/10

As a part of the nuclear fuel cycle in Japan, the mixed oxide (MOX) fuels are produced through the microwave heating of the Pu/U mixed nitrate solution obtained from spent fuels. This paper investigated the electric power absorption of the solid Pu/U mixed nitrate medium in a cylindrical oven cavity and the effect of the input polarized waves. The numerical simulations have revealed that the incidence of the circularly polarized wave improves the uniformity of the absorbed power of the medium placed in the cylindrical cavity.

JAEA Reports

Laboratory Validation Test of Dry-Fracture Method of Stress Measurement

Shingu, Kazuki*; Nakajima, Toshihide*; Yamashita, Mitsugu*

JNC TJ7420 2005-066, 99 Pages, 2000/03

JNC-TJ7420-2005-066.PDF:2.47MB

The active fault survey tunnel across the Mozumi-Sukenobu Fault is located at the Kamioka Mine, northern Gifu prefecture, Central Japan. At present, the comprehensive studies of the active fault are being carried out in this tunnel. In this report, the results of the laboratory test using steel pipes and numerical simulation for the new ground stress measuring instrument were presented in order to inspect the stress state around the active fault.

JAEA Reports

Laboratory Validation Test of Dry-Fracture Method of Stress Measurement

Shingu, Kazuki*; Nakajima, Toshihide*; Yamashita, Mitsugu*

JNC TJ7420 2005-063, 242 Pages, 1999/03

JNC-TJ7420-2005-063.PDF:19.78MB

The active fault survey tunnel across the Mozumi-Sukenobu Fault is located at the Kamioka Mine, northern Gifu prefecture, Central Japan. At present, The comprehensive studies of the active fault are being carried out in this tunnel. The results of the laboratory test and numerical simulation for the new ground stress measuring instrument were presented in order to inspect the stress state around the active fault.

JAEA Reports

Investigation of the Hydraulic Properties in the Active Fault Survey Tunnel

Takemura, Tomoyuki*; Sakogaichi, Kaoru*; Takahashi, Eiichiro*; Takebe, Akimitsu*; Nakajima, Toshihide*; Yamashita, Mitsugu*; Yamanouchi, Hirofumi*

JNC TJ7420 2005-041, 129 Pages, 1999/03

JNC-TJ7420-2005-041.pdf:65.88MB

The active fault survey tunnel that crossed the Mozumi-Sukenobu fault (a member of the Atotsugawa fault system) is located at the Kamioka mine, northern Gifu prefecture, Central Japan. The comprehensive study of the active fault such as the earthquake mechanism is done by using this tunnel. The purpose of this investigation is to define the hydrological characteristics inside and around the Mozumi - Sukenobu fault crush zones. The investigation is mainly Lugeon test and simple permeability test inside and around the crush zones.

JAEA Reports

Investigation of Ground Water around the Fault in the Active Fault Study Drift

Shingu, Kazuki*; Nakajima, Toshihide*; Yamashita, Mitsugu*

JNC TJ7420 2005-038, 39 Pages, 1998/03

JNC-TJ7420-2005-038.pdf:3.05MB

The active fault study drift that crossed the Mozumi-Sukenobu fault (a member of the Atotsugawa fault system) is located at the Kamioka mine, northern Gifu prefecture, Central Japan. The comprehensive study of the active fault is done in this drift. The purpose of this investigation is to obtain the data of the basis to clear the hydro-geological structure around the active fault. From December 1, 1997 to March 13, 1998, the pore pressure was measured using the hole.

JAEA Reports

Geological survey and initial stress measurement test consernig of "The crustal deformation study in the active fault zone"

Takemura, Tomoyuki*; Shingu, Kazuki*; Sakogaichi, Kaoru*; Nishikawa, Yuji*; Okada, Yoichi*; Nakajima, Toshihide*; Yamashita, Mitsugu*

JNC TJ7420 2005-035, 152 Pages, 1998/03

JNC-TJ7420-2005-035.pdf:27.16MB

The active fault survey tunnel that crossed the Mozumi-Sukenobu fault (MSF) is located at the Kamioka mine, northern Gifu prefecture, Central Japan. The comprehensive study of the active fault, such as the study of the earthquake mechanism and the development of the new initial stress measurement method is done by using this tunnel. One of the purposes of this investigation is to define the three-dimensional distribution of the MSF by geological survey, on the basis of the seismic and geophysical studies on this fault. The other purpose is to develop the new initial stress measurement method.

JAEA Reports

Investigation of the Hydraulic Properties around the Active Fault in the Crustal Deformation Zone

Takemura, Tomoyuki*; Shingu, Kazuki*; Takahashi, Eiichiro*; Okada, Yoichi*; Takebe, Akimitsu*; Nakajima, Toshihide*; Inoue, Toshio*

JNC TJ7420 2005-033, 128 Pages, 1998/03

JNC-TJ7420-2005-033.pdf:51.98MB

The active fault survey tunnel that crossed the Mozumi-Sukenobu fault (a member of the Atotsugawa fault system) is located at the Kamioka mine, northern Gifu prefecture, Central Japan. The comprehensive study of the active fault is done by using this tunnel. The purpose of this investigation is to define the hydrological characteristics of the Mozumi-Sukenobu fault crush zones. The permeability of the crush zones is measured by the Lugeon test and the simple injection test.

JAEA Reports

None

*; Shingu, Kazuki*; Takahashi, Eiichiro*; Nakajima, Toshihide*; Yamashita, Mitsugu*; *; *

PNC TJ7187 97-002, 586 Pages, 1997/11

PNC-TJ7187-97-002.pdf:47.21MB

None

JAEA Reports

None

Shingu, Kazuki*; Horinokuchi, Kenji*; Nakajima, Toshihide*

PNC TJ7187 97-001, 170 Pages, 1997/03

PNC-TJ7187-97-001.pdf:7.45MB

no abstracts in English

JAEA Reports

Additional Groundwater Sampling and Analysis in the Investigation of Deep Groundwater (DH-15 Hole)

Hama, Hiroshi*; Yamada, Tsuyoshi*; Ide, Mitsuyoshi*; Takahashi, Eiichiro*; Yamamoto, Katsuya*; Nakajima, Toshihide*; Watabe, Takeo*

JNC TJ7440 2005-074, 270 Pages, 1995/05

JNC-TJ7440-2005-074.PDF:17.59MB
JNC-TJ7440-2005-074(errata).pdf:0.08MB

In 1997, DH-5 hole was drilled at P.N.C.(present J.N.C.) Toki Branch of Tono Geoscience Centr in Gifu prefecture. The borehole was drilled to a depth of 502.3 meters in Toki granite in order to investigate the deep groundwater. This report describes the investigation of the groundwater conducted at depth from 323.8 to 330.8 meters to make clear geological, hydrogeological and geochemical characteristics of study area. The investigation includes the following items;i) Sampling of the groundwaterii) Measurement of physical chemistry parameters of the groundwater in the borehole iii) Chemicaal analysis of the main composition of the groundwater during the continuous samplingiv) Chemical analysis of the groundwater It has become clear the following points;* The physical chemistry parameters of groundwater was alkalic, low deoxidize and buffer ability. There were few total ions and sulfide ions in the groundwater.* The isotopic analysis showed that the groundwater was regarded as rainwater in origin on the side of the Pacific Ocean and was relatively young with the age of a few decades.* According to the tri-linear diagram, the groundwater was classified into Ca(HCO$$_{3)}$$$$_{2}$$type. Based on hydrochemical facies, the groundwater was classified into Ca$$_{2}$$sup+ Na$$^{+,}$$and HCO$$_{3-}$$Cl$$^{-}$$SO$$_{4}$$$$^{2}$$$$^{-}$$in the cation and anion facies, respectively.* Nitrite oxidizing bacteria, nitrite reducing bacteria and nitrate reducing bacteria were detected in the groundwater by the bacteria analysis.

JAEA Reports

Study on the Geological Environment Influenced by Fault Movement(III)

Shingu, Kazuki*; Sato, Eitaro*; Adachi, Kazuhiro*; Kudo, Masakatsu*; Ishizuka, Yoshiaki*; Horinokuchi, Kenji*; Nakajima, Toshihide*

JNC TJ7400 2005-007, 214 Pages, 1995/03

JNC-TJ7400-2005-007.pdf:16.96MB

The objective of this study is to prove the long-term geoscientific stability of the geological environment. The survey will clarify the extent and degree of mechanical change influenced by fault movement deep underground as well as the surface. The study was conducted in Mozumi of the Kamioka mining district, located in the Atotsu active fault system zone. This year, a study was carried out by measuring stress state and rock properties around the active fault. At first, stress measurement by double fracturing was conducted at Nagato No.1 borehole in order to compare a newly measured stress state with the one done last year. The difference between them was very little. Secondly, the first stress measurement was carried out on the Nagato No.3 borehole.

JAEA Reports

A Study of a Geological Environment Influenced by Fault Movement(II)

Shingu, Kazuki*; Horinokuchi, Kenji*; Nakajima, Toshihide*; Furumori, Hisayoshi*

JNC TJ7400 2005-005, 250 Pages, 1994/03

JNC-TJ7400-2005-005.pdf:23.33MB

The objective of this study is to prove the long-term geoscientific stability of a geological environment. This was accomplished by measurement of stress and study of rock properties around an active fault in the Atotsu fault system near Mozumi in the Kamioka mining district. A future goal of the project is to clarify the areal extent and degree to which fault movement at the surface and at depth affects mechanical changes.

Oral presentation

FaCT Phase-I evaluation on advanced aqueous reprocessing process, 6; Extraction chromatography technology development for Am and Cm separation from HLLW

Nomura, Kazunori; Watanabe, So; Asakura, Toshihide; Koma, Yoshikazu; Sano, Yuichi; Matsumura, Tatsuro; Koizumi, Kenji; Nakajima, Yasuo; Morita, Yasuji; Washiya, Tadahiro

no journal, , 

no abstracts in English

Oral presentation

Evaluation of fission product release and transport behavior during severe accident focusing on the chemical forms, 3; Development of equilibrium vapor pressure measurement technique for FP compound

Takai, Toshihide; Nakajima, Kunihisa; Furukawa, Tomohiro; Osaka, Masahiko

no journal, , 

To develop reliable thermodynamic database of fission products is necessary for more accurate evaluation of fission product release and transport behavior using progression process analysis code under severe accident. This presentation introduces maintenance situation of high temperature mass spectrometer and reliability evaluation result.

Oral presentation

Development of measurement technique on the equilibrium vapor pressure of simulated fission products

Takai, Toshihide; Nakajima, Kunihisa; Furukawa, Tomohiro; Osaka, Masahiko

no journal, , 

Improvement of the serve accident analysis code is important to evaluate the distribution of the released fission products (FPs) in the reactor more precisely from the view point of both the removal preparation of the fuel debris in the Fukushima Daiichi Nuclear Power Station and improved source term evaluation. The development of the calculation model, which can evaluate the effect of atmosphere and the chemical reaction between the released FPs and control rod material (B$$_{4}$$C) at elevated temperature, is important for this purpose. The measurement technique of the equilibrium vapor pressure using a high temperature mass spectrometer was under development to expand the thermodynamic database of the simulated FPs, because the chemical equilibrium analysis plays an important role to clarify the effect of chemical reactions. In this study, the apparatus was developed for the equilibrium vapor pressure measurements, and then the reliability of measurement results was evaluated.

Oral presentation

Research on fission product chemistry for FP release and transport behavior

Osaka, Masahiko; Miwa, Shuhei; Yamashita, Shinichiro; Takai, Toshihide; Nakajima, Kunihisa; Furukawa, Tomohiro; Nagase, Fumihisa

no journal, , 

Fission product (FP) chemistry under the LWR severe accident (SA) conditions should be deeply understood for more accurate evaluation of FP release and transport behavior, which can lead to reduction of uncertainty in the evaluation of source term. This paper describes the contents of research program that is focused on the FP chemistry. Results of the FP chemical form just after release from fuel by a chemical equilibrium calculation considering dependences of release kinetics for related elements showed that dominant vapor species have changed according to the atmospheres and Cs-B-O species became dominant in the presence of B$$_{4}$$C. As for the Cs-chemisorption behavior, it was found by a literature review that resultant compounds formed by the Cs-chemisorption onto the SS could be divided into two categories, Cs-Cr-O and Cs-Si-O compounds.

Oral presentation

Chemical impacts of boron on the cesium release and transport behavior under severe accident conditions, 3; Preparation and phase relation of Cs$$_{2}$$O-B$$_{2}$$O$$_{3}$$ system

Nakajima, Kunihisa; Takai, Toshihide; Furukawa, Tomohiro; Osaka, Masahiko

no journal, , 

There are limited thermodynamic data available for compounds in the Cs-B-O system. We have a plan to evaluate the thermodynamic properties of the cesium borates from their equilibrium vapor pressures determined by a Knudsen effusion mass spectrometry. Cesium borates such as triborate, CsB$$_{3}$$O$$_{5}$$, were prepared and phase relations in the Cs-B-O system were investigated using a powder X-ray diffractometer. As one of the results, it was found that CsB$$_{3}$$O$$_{5}$$ has an orthorhombic crystal structure.

23 (Records 1-20 displayed on this page)