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Journal Articles

Rapid measurement of the chloride diffusion coefficient in concrete from combination of non-steady-state migration experiment and EPMA

Ogino, Masataka*; Owaki, Eiji*; Shirase, Mitsuyasu*; Nakayama, Masashi

Konkurito Kogaku Nenji Rombunshu (DVD-ROM), 39(1), p.703 - 708, 2017/07

no abstracts in English

Journal Articles

Mineralogical analysis and dating using the JEOL JXA-8530F FE-EPMA at the JAEA Tono Geoscience Center

Shimizu, Mayuko; Sano, Naomi; Suzuki, Kazuhiro

Nagoya Daigaku Nendai Sokutei Kenkyu, 1, p.36 - 43, 2017/03

We established a CHIME monazite dating method using R$$_{rm R}$$ = 100 mm spectrometers and a provenance analysis method using heavy minerals for the dating and analysis of minerals. CHIME dating has traditionally been performed with conventional R$$_{rm R}$$ = 140 mm spectrometers for measurement of U, Th, and Pb. These spectrometers, however, have low count rates in measurements of Pb. We used a JEOL JXA-8530F FE-EPMA equipped with R$$_{rm R}$$ = 100 mm spectrometers, a system installed at Tono Geoscience Center in 2014, for the CHIME dating of monazite. We corrected the spectral interferences peculiar to R$$_{rm R}$$ = 100 mm spectrometers by the method of AA mli and Griffin (1975) for monazite analyses. We calculated the correction factors by a new interference correction method using natural monazites. We also established a quick quantitative analysis and identification method for heavy minerals using the EPMA.

Journal Articles

Application of FE-SEM to the measurement of U, Pu, Am in the irradiated MA-MOX fuel

Sasaki, Shinji; Tanno, Takashi; Maeda, Koji

Proceedings of 54th Annual Meeting of Hot Laboratories and Remote Handling (HOTLAB 2017) (Internet), 6 Pages, 2017/00

During irradiation in a fast reactor, the microstructure change of the mixed oxide fuels and the changes of element distributions occur because of a radial temperature gradient. Therefore, it is important to study the irradiation behavior of MA-MOX for advancement of fast reactor fuels. In order to make detailed observations of microstructure and elemental analyses of MA-MOX, irradiated MA-MOX specimens were carried out PIE by using a FE-SEM equipped with WDX. Because fuel samples have high radio activities and emit alpha-particles, the instrument was modified. the instrument was installed in a lead shield box and the control unit was separately located outside the box. The microstructure changes were observed in irradiated MA-MOX specimen. The characteristic X-rays peaks were detected successfully. By measuring the intensities of characteristic X-rays, it was tried quantitative analysis of U, Pu, Am along radial direction of irradiated specimen.

Journal Articles

CHIME dating of zircon using JEOL JXA-8530F FE-EPMA at JAEA Toki Research Institute of Isotope Geology and Geochronology

Shibata, Kenji; Shimizu, Mayuko; Suzuki, Kazuhiro

Nagoya Daigaku Kasokuki Shitsuryo Bunsekikei Gyoseki Hokokusho, 26, p.126 - 131, 2015/03

no abstracts in English

Journal Articles

Fission gas release in irradiated UO$$_{2}$$ fuel at burnup of 45 GWd/t during simulated Reactivity Initiated Accident (RIA) condition

Amaya, Masaki; Sugiyama, Tomoyuki; Fuketa, Toyoshi

Journal of Nuclear Science and Technology, 41(10), p.966 - 972, 2004/10

 Times Cited Count:6 Percentile:54.23(Nuclear Science & Technology)

Pulse irradiation simulating RIA condition was carried out for test rod prepared from fuel irradiated in a commercial reactor. After the pulse irradiation, optical microscopy (OM) and scanning electron microscopy (SEM) observations and electron probe micro analysis (EPMA) were conducted for the test rod as a part of destructive tests. Fission gas release behavior during pulse irradiation was investigated by EPMA and puncture test. Xeon depression was observed in the fuel pellet after pulse irradiation at periphery and center region. It is considered that fission gas was mainly released from the pellet center region during pulse irradiation. The amount of xenon release during pulse irradiation was estimated to be 10-12% from the EPMA results and this estimated value was comparable with the puncture test result. Comparing the estimated value with other results of out-of-pile annealing tests, it was concluded that most fission gas, which was accumulated at grain boundary during base irradiation, was released from the center region of test fuel pellet during pulse irradiation.

JAEA Reports

Replacement of the filter for primary helium circulators of the HTTR

Furusawa, Takayuki; Sumita, Junya; Ueta, Shohei; Nemoto, Takahiro; Oyama, Sunao*; Kamata, Takashi

JAERI-Tech 2004-024, 46 Pages, 2004/03

JAERI-Tech-2004-024.pdf:6.75MB

Primary helium circulators of the HTTR are the important component as the helium gas which is reactor coolant, and three circulators for the primary pressurized water cooler and one for the intermediate heat exchanger are installed in primary cooling system. In the upstream of these circulators, the filter has been installed in order to suppress that it is entrapped in the bearing in which fine particles in helium gas, support main shaft of the helium circulator. The differential pressure of this filter rose gradually during rise-to-power test. The rise of the filter differential pressure of the helium circulator may cause the problem for reactor operation. Therefore, the filters were newly manufactured, and replacement of the filter was carried out. In replacement of the filter, appearance confirmation was carried out and deposit of the filter was analyzed. This paper described replacement of the filter and filter differential pressure rise investigation of the causes.

Journal Articles

Phase equilibria in the Be-V and Be-Ti binary systems

Onuma, Ikuo*; Kainuma, Ryosuke*; Uda, Minoru*; Iwadachi, Takaharu*; Uchida, Munenori*; Kawamura, Hiroshi; Ishida, Kiyohito*

JAERI-Conf 2004-006, p.172 - 183, 2004/03

no abstracts in English

Journal Articles

Behavior of plutonium and americium at liquid cadmium cathode in molten LiCl-KCl electrolyte

Iizuka, Masatoshi*; Uozumi, Koichi*; Inoue, Tadashi*; Iwai, Takashi; Shirai, Osamu; Arai, Yasuo

Journal of Nuclear Materials, 299(1), p.32 - 42, 2001/10

 Times Cited Count:65 Percentile:2.35

no abstracts in English

Journal Articles

Characterization of individual particles including lead by combination of SIMS and EPMA

Esaka, Fumitaka; Watanabe, Kazuo; Magara, Masaaki; Hanzawa, Yukiko; Usuda, Shigekazu; Gunji, Katsubumi; Nishimura, Hideo; Adachi, Takeo

Proceedings of 12th International Conference on Secondary Ion Mass Spectrometry (SIMS 12), p.977 - 980, 2000/00

no abstracts in English

JAEA Reports

Development of radiation-hard electric connector with ball bearing for in-vessel remote maintenance equipment of ITER, 2

*; Obara, Kenjiro; Tada, Eisuke; Morita, Yosuke; Yagi, Toshiaki; *

JAERI-Tech 99-029, 36 Pages, 1999/03

JAERI-Tech-99-029.pdf:3.25MB

no abstracts in English

Journal Articles

Characterisation of oxide films formed on steel surface in BWR environment

Kameo, Yutaka

Proceedings of OECD/NEA Workshop on Evaluation of Speciation Technology, p.241 - 245, 1999/00

no abstracts in English

Journal Articles

Interdiffusion in the U-Zr system at $$delta$$-phase compositions

Akabori, Mitsuo; Ito, Akinori; Ogawa, Toru; *

Journal of Alloys and Compounds, 271-273, p.597 - 601, 1998/00

 Times Cited Count:14 Percentile:31.37

no abstracts in English

Journal Articles

Moessbauer spectroscopic study on glaze of pottery

*; *; *; *; Nakahara, Hiromichi*; Nakada, Masami; Saeki, Masakatsu; Aratono, Yasuyuki

Hyperfine Interactions, 91, p.645 - 649, 1994/00

 Times Cited Count:2 Percentile:78.19(Physics, Atomic, Molecular & Chemical)

no abstracts in English

Journal Articles

Chemical forms of solid fission products in the irradiated uranium-plutonium mixed nitride fuel

Arai, Yasuo; Maeda, Atsushi; Shiozawa, Kenichi; Omichi, Toshihiko

Journal of Nuclear Materials, 210, p.161 - 166, 1994/00

 Times Cited Count:18 Percentile:16.69

no abstracts in English

Journal Articles

A Method for estimating peak temperature reached of the TMI-2 vessel lower head by microstructural examination of 308 stainless steel overlay

Tsukada, Takashi; Suzuki, Masahide; Kawasaki, Satoru

Proceedings of Three Mile Island Reactor Pressure Vessel Investigation Project Open Forum, p.151 - 163, 1994/00

no abstracts in English

Journal Articles

High temperature corrosion of iron chromium alloys by tellurium

; Tsuji, Toshihide*; *

Journal of Nuclear Science and Technology, 28(8), p.721 - 731, 1991/08

no abstracts in English

JAEA Reports

Some Aspects of Natural Analogue Studies for Assessment of Long-Term Durability of Engineered Barrier Materials; Recent Activities at PNC Tokai, Japan

Yusa, Yasuhisa; ;

PNC-TN8410 91-007, 18 Pages, 1990/12

PNC-TN8410-91-007.pdf:0.59MB

This paper contains an overview of analogue studies for the assessment of long-term durability of engineered barrier materials at PNC Tokai. Materials of young age and with simple history are the most suitable for study as: (1)properties of the materials tend to deteriorate over longer historical time intervals; and (2) detailed quantitative data on time intervals and environmental conditions are more likely to be available. The following materials and their alteration phenomena were selected: (1)weathering alteration of basaltic glass (as vitrified waste form), (2)corrosion of iron in soil (as overpack), (3)illitization of smectite associated with contact metamorphism (as buffer material), (4)alteration of cement (as buffer or backfill material). (1)Weathering alteration of basaltic glass: Basaltic g1asses, from the Fuji and the Izu-Ohshima pyroclastic fall deposits were studied. The observations were made: (a)Climatological conditions have not varied significantly during the last three thousand years. Therefore, values for temperature, amount, and chemistry of ground water are quantified. (b)The cases studied could be regarded as leaching experiments in groundwater, using mass balances in water-g1ass interaction. (c)Although the groundwater is of Ca(Mg)-HCO$$_{3}$$ type in the Fuji area and of Na-Cl type in the Izu-Ohshima, similar alteration ratios (2$$sim$$ 3$$mu$$m/1000yr) were obtained. (2)Corrosion of iron in soil: Industrial materials, such as gas/water service pipes of carbon steel or cast iron embedded in soil for 20 $$sim$$ 110 years, were selected for an analogue study of corrosion of iron in bentonite. The maximum corrosion rates obtained so far fall in the range of 0.04$$sim$$0.09 mm/yr. (3)Illitization of smectite associated with contact metamorphism: In the Murakami bentonite deposit in central Japan, lateral variation of smectite to smectite/illite mixed-layer minerals are found in the aureole of the rhyolite intrusion body. Conversion of smectite to the

JAEA Reports

Migration behavior of palladium in UO$$_{2}$$

*; Ohashi, Hiroshi*; Morozumi, Takashi *; Ogawa, Toru; Fukuda, Kosaku

JAERI-M 90-113, 46 Pages, 1990/07

JAERI-M-90-113.pdf:3.74MB

no abstracts in English

JAEA Reports

None

PNC-TN8410 90-059, 19 Pages, 1990/06

PNC-TN8410-90-059.pdf:0.78MB

None

JAEA Reports

None

*

PNC-TN8410 90-004, 56 Pages, 1990/01

PNC-TN8410-90-004.pdf:2.44MB

None

34 (Records 1-20 displayed on this page)