Refine your search:     
Report No.
 - 
Search Results: Records 1-20 displayed on this page of 21

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

Journal Articles

Field tests on migration of TRU-nuclide, 3; Migration test of radionuclide in aerated soil layer

Mukai, Masayuki; Tanaka, Tadao; Maeda, Toshikatsu; Ogawa, Hiromichi; Matsumoto, Junko; Munakata, Masahiro; Zhao, Y.*; Guo, Z.*; Ni, S.*; Li, S.*

Nihon Genshiryoku Gakkai Wabun Rombunshi, 2(3), p.342 - 349, 2003/09

Evaluation of radionuclide migration in geologic media is of great importance in safety assessment for shallow land disposal specially for TRU nuclides because of inadequate data based on field test. As a cooperative research between JAERI and CIRP, a field test of radionuclide migration was conducted under natural condition using Sr-90, Np-237 and Pu-238 to obtain migration data of the radionuclides in actual aerated layer under natural rainfall condition. Values of input parameters to an existing evaluation equation of nuclide migration were determined on the basis of the results of laboratory experiments of batch and column methods and field investigation. Migration distribution of the radionuclides calculated with the determined values showed reasonable agreement with the measured distribution of the field test. This confirmed an applicability of the evaluation equation for radionuclide migration to actual aerated layer under natural condition.

JAEA Reports

Evaluation of covariances for resolved resonance parameters of $$^{235}$$U, $$^{238}$$U, and $$^{239}$$Pu in JENDL-3.2

Kawano, Toshihiko*; Shibata, Keiichi

JAERI-Research 2003-001, 36 Pages, 2003/02

JAERI-Research-2003-001.pdf:1.67MB

Evaluation of covariances for resolved resonance parameters of $$^{235}U$$, $$^{238}U$$, and $$^{239}Pu$$ was carried out. Although a large number of resolved resonances are observed for major actinides, uncertainties in averaged cross sections are more important than those in resonance parameters in reactor calculations. We developed a simple method which is to provide a covariance matrix for the resolved resonance parameters on the basis of uncertainties in the averaged cross sections. The method was adopted to evaluate the covariance data for some important actinides, and the results were compiled in the JENDL-3.2 covariance file.

JAEA Reports

Adsorption mechanisms and models of $$^{85}$$Sr, $$^{237}$$Np, $$^{238}$$Pu and $$^{241}$$Am in loess media (Joint research)

Tanaka, Tadao; Mukai, Masayuki; Maeda, Toshikatsu; Matsumoto, Junko; Ogawa, Hiromichi; Li, S.*; Wang, Z.*; Wang, J.*; Guo, Z.*; Zhao, Y.*

JAERI-Research 2002-034, 20 Pages, 2002/12

JAERI-Research-2002-034.pdf:1.1MB

Adsorption mechanisms and models of $$^{85}$$Sr(II), $$^{237}$$Np(V), $$^{238}$$Pu(IV) and $$^{241}$$Am(III) on the loess were investigated from their adsorption and desorption properties. The distribution coefficient of $$^{85}$$Sr and $$^{237}$$Np was 2 - 3 orders of magnitude smaller than that of $$^{238}$$Pu and $$^{241}$$Am. The adsorption of $$^{85}$$Sr and $$^{237}$$Np was mainly controlled by the ion exchange reaction. On the other hand, the adsorption of $$^{238}$$Pu and $$^{241}$$Am was mostly controlled by the selective chemical reactions with Fe and Mn oxyhydroxide/oxide and humic substances. On the basis of the experimental results, several types of adsorption models of the radionuclides, considering elemental concentrations, adsorption mechanisms and kinetics, were proposed for setting up the analytical systems of radionuclide migration in the loess media.

JAEA Reports

Neutron and proton nuclear data evaluation for $$^{235}$$U and $$^{238}$$U at energies up to 250 MeV

Konobeyev, A. Y.; Fukahori, Tokio; Iwamoto, Osamu

JAERI-Research 2002-028, 69 Pages, 2002/12

JAERI-Research-2002-028.pdf:1.93MB

Basic features of nuclear data evaluation for uranium isotopes $$^{235}$$U and 238U at intermediate energies are described. The coupled channel optical model was used to obtain total cross section, reaction cross section, angular distributions and transmission coefficients. The direct, pre-compound and evaporation models were used to describe neutron and charged particles emission from excited nuclei. The neutron data evaluated were combined with JENDL-3.3 data below 20 MeV to obtain a full data set in the whole energy range between 10$$^{-5}$$ eV and 250 MeV. Evaluation of the proton data has been done at energies from 1 to 250 MeV

Journal Articles

Uncertainty analyses in the resolved resonance region of $$^{235}U$$, $$^{238}U$$, and $$^{239}Pu$$ with the Reich-Moore $$R$$-matrix theory for JENDL-3.2

Kawano, Toshihiko*; Shibata, Keiichi

Journal of Nuclear Science and Technology, 39(8), p.807 - 815, 2002/08

 Times Cited Count:5 Percentile:34.85(Nuclear Science & Technology)

A simple method to estimate covariances for resolved resonance parameters was developed. Although a large number of resolved resonances are observed for major actinides, uncertainties in averaged cross sections are more important than those in resonance parameters in reactor calculations. The method developed here is to derive a covariance matrix for the resolved resonance parameters which gives an appropriate uncertainty of the averaged cross sections. The method was adopted to evaluate the covariance data for $$^{235}U$$, $$^{238}U$$, and $$^{239}Pu$$ resonance parameters in JENDL-3.2,with the Reich-Moore R-matrix formula.

Journal Articles

Reactor benchmark testing for JENDL-3.2, JEF-2.2 and ENDF/B-VI.2

Takano, Hideki; Akie, Hiroshi; Kaneko, Kunio*

Proc. of Int. Conf. on the Phys. of Nucl. Sci. and Technol., 1, p.58 - 65, 1998/00

no abstracts in English

Journal Articles

Status of international benchmark experiment for effective delayed neutron fraction ($$beta$$$$_{eff}$$)

Okajima, Shigeaki; Sakurai, Takeshi; Mukaiyama, Takehiko

JAERI-Conf 97-005, 00(00), p.71 - 76, 1997/00

no abstracts in English

JAEA Reports

Sensitivity analysis of JENDL-3.2 based on benchmark calculations for fast reactors

Z.Pintai*; Takano, Hideki

JAERI-Research 96-010, 72 Pages, 1996/03

JAERI-Research-96-010.pdf:2.01MB

no abstracts in English

Journal Articles

JENDL-3 revision 2 - Its evaluation and validation

; Takano, Hideki; Nakagawa, Tsuneo

Transactions of the American Nuclear Society, 73, p.424 - 425, 1995/00

no abstracts in English

Journal Articles

Measurements and analyses of the ratio of $$^{238}$$U captures to $$^{235}$$U fission in low-enriched UO$$_{2}$$ tight lattices

Nakajima, Ken; ; Yamamoto, Toshihiro; ; Suzaki, Takenori

Journal of Nuclear Science and Technology, 31(11), p.1160 - 1170, 1994/11

 Times Cited Count:7 Percentile:56.75(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Database for $$^{238}$$U inelastic scattering cross section evaluation

Kanda, Yukinori*; Fujikawa, Noboru*; Kawano, Toshihiko*

JAERI-M 93-205, 52 Pages, 1993/10

JAERI-M-93-205.pdf:0.89MB

no abstracts in English

JAEA Reports

Measurement of Doppler effect up to 2000$$^{circ}$$C at FCA, 3; Development of a cell code, PEACO-X, with ultra-fine group structure

Okajima, Shigeaki; Oigawa, Hiroyuki; Mukaiyama, Takehiko

JAERI-M 92-185, 42 Pages, 1992/11

JAERI-M-92-185.pdf:1.02MB

no abstracts in English

JAEA Reports

Experimental study of $$^{238}$$U Doppler reactivity worth in FCA XVI-1 and XVI-2 cores

Oigawa, Hiroyuki; Okajima, Shigeaki; Mukaiyama, Takehiko;

JAERI-M 92-113, 36 Pages, 1992/08

JAERI-M-92-113.pdf:1.1MB

no abstracts in English

JAEA Reports

Journal Articles

Double heterogeneity effect on the resonance absorption in the very high temperature gas-cooled reactor

; ; *

Journal of Nuclear Science and Technology, 22(1), p.16 - 27, 1985/00

 Times Cited Count:11 Percentile:78.76(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Doppler Effect Measurement in FCA Assemblis X-3 and XI-1

;

JAERI-M 84-086, 29 Pages, 1984/05

JAERI-M-84-086.pdf:0.77MB

no abstracts in English

Journal Articles

Report on the first version of Japnese evaluated nuclear data library; JENDL-1

; Kikuchi, Yasuyuki; Nakagawa, Tsuneo

Nihon Genshiryoku Gakkai-Shi, 20(1), p.30 - 36, 1978/01

 Times Cited Count:0

no abstracts in English

Journal Articles

Effect of nonelastic neutron anisotropy on fission rates measured in a graphite-reflected lithium assembly

; D.W.Muir*;

Journal of Nuclear Science and Technology, 14(9), p.680 - 681, 1977/09

 Times Cited Count:10

no abstracts in English

Journal Articles

Gamma-ray spectrometric determination of isotopic ratios of plutonium

Umezawa, Hirokazu; ;

Journal of Nuclear Science and Technology, 13(6), p.327 - 332, 1976/06

 Times Cited Count:17

no abstracts in English

Journal Articles

Revision of JAERI-Fast Set based on benchmark test

; ; Katsuragi, Satoru

Dai-1-Kai Toropikaru Mithingu Hobunshu; Kosokuro Butsuri, p.68 - 76, 1973/00

no abstracts in English

Journal Articles

Effect of 1/E spectrum on effective self-shielding factor of U-238 absorption near Na resonance

Tone, Tatsuzo

Journal of Nuclear Science and Technology, 5(4), p.195 - 196, 1968/00

 Times Cited Count:1

no abstracts in English

21 (Records 1-20 displayed on this page)