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Oral presentation

Development of nuclear data processing system FRENDY, 3; Construction of the probability table in the unresolved resonance region

Tada, Kenichi; Nagaya, Yasunobu

no journal, , 

JAEA has been developing the nuclear data processing code FRENDY (FRom Evaluated Nuclear Data librarY to any application). In this presentation, construction of the probability table in the unresolved resonance region is described.

Oral presentation

Analysis of PIE data of BWR fuel using SWAT4

Kikuchi, Takeo; Tada, Kenichi; Suyama, Kenya

no journal, , 

To estimate the prediction accuracy of the integrated burn up analysis code system SWAT4, we compared the calculation results of SWAT4 and the PIE data of the BWR fuel which was measured by JAERI in 1990s. Comparison results are indicated that the C/E value of major heavy nuclei, e.g., U and Pu, is approximately 1.0. The calculation results are also indicated that some fission products, e.g., Sm, have the larger difference.

Oral presentation

Applied example MCNP5 on ambient dose evaluation from nuclear facility

Zaima, Naoki; Naganuma, Masaki; Sakao, Ryota

no journal, , 

no abstracts in English

Oral presentation

Effect of halogenated gas on detritiation efficiency of the detritiation system

Iwai, Yasunori; Kondo, Akiko*; Edao, Yuki; Sato, Katsumi; Kubo, Hitoshi*; Oshima, Yusuke*

no journal, , 

Effect of halogenated gas on detritiation efficiency of the detritiation system has been investigated taking an event of off normal event such as fire into consideration. Concerning the activity of platinum catalyst for oxidation of tritium, we have evaluated the steep decrease in activity of platinum catalyst in the presence of halogenated gas. In order to avoid the steep decrease in activity, a noble catalyst alloyed with platinum and palladium showed an outstanding proof. In addition, the halogenated acid produced over catalyst surface affects the activity of catalyst. As for water absorber, a molecular sieve decreased its water absorbing capacity in the presence of halogenated gas.

Oral presentation

Prediction of thermal neutron capture cross section by Monte Carlo method

Furutachi, Naoya; Minato, Futoshi; Iwamoto, Osamu

no journal, , 

To establish the nuclear transmutation system for the long-lived fission products (LLFPs), it is desired to improve precision of the simulation calculation for the transmutation system. To achieve this, nuclear data of various nuclei produced via the nuclear transmutation of LLFPs are also important. However, it is expected that unstable nuclei with no available experimental data are produced via the nuclear transmutation. One of the physical quantity that is very difficult to predict with no experimental data is the thermal neutron capture cross section. The thermal neutron capture cross section is dominated by the energy and width of the first resonance, and slight variation of them can change the thermal neutron capture cross section drastically. While it is very difficult to determine them with high precision, it is known that a resonance width follows Porter-Thomas distribution because of complexity and randomness of a nuclear structure, and a resonance spacing follows Wigner distribution. In this work, we calculate the thermal neutron capture cross section by using the statistical property of the resonance parameters with Monte Carlo method. The calculation result is obtained as a probability distribution of the thermal neutron capture cross section. We calculated approximately 250 nuclei that have experimental data, and found that the dispersion of the experimental data is well explained by the calculated probability distribution.

Oral presentation

Making of beta decay database by quasiparticle random phase approximation

Minato, Futoshi

no journal, , 

no abstracts in English

Oral presentation

Development of active neutron NDA techniques for nuclear non-proliferation, 1; R&D plan

Kureta, Masatoshi; Koizumi, Mitsuo; Ozu, Akira; Tsuchiya, Harufumi; Seya, Michio

no journal, , 

The new program "Development of active neutron NDA techniques" has been started for non-proliferation applications collaborating with EC-JRC. The final purpose of this program is to establish the measurement techniques for the high radioactive special nuclear material such as MA-Pu fuel for transmutation of minor actinide. In this program, JAEA will conduct the R&D on active neutron non-destructive measurement techniques, DDA, NRTA, PGA/NRCA and DGS. The research and development plan is presented in this report.

Oral presentation

Experimental investigation of alternative He-3 neutron detectors for the active neutron method

Komeda, Masao; Maeda, Makoto; Shimofusa, Taichi; Tobita, Hiroshi; Ozu, Akira; Kureta, Masatoshi

no journal, , 

He-3 detectors are most popular for NDA systems of the active neutron method. However, the price of He-3 detectors is rising due to short supply of the He-3 gas, and it is concerned that the cost of fabricating a NDA system with many He-3 detectors is rising. A new hybrid detector called B-10 plus detector has been developed by GE Reuter-Stokes. The B-10 plus detector has higher detection efficiency than a B-10 detector while the usage of He-3 gas is reduced. We make a report on experimental results of performance comparison between He-3 detectors and B-10 plus detectors on the active neutron method.

Oral presentation

Theoretical model analysis of deuteron-induced activation cross sections

Nakayama, Shinsuke; Kono, Hiroshi*; Araki, Shohei*; Watanabe, Yukinobu*; Iwamoto, Osamu; Ye, T.*

no journal, , 

Theoretical model analysis of deuteron-induced activation cross sections were performed using the calculation code system we have developed so far. In our previous works, we analyzed mainly double differential cross sections for the $$(d,xp)$$ and $$(d,xn)$$ reactions, and activation cross sections from the $$(d,p)$$ reactions in order to validate calculation method for the direct processes. In the present work, we analyzed activation cross sections from multi particle emission induced by high energy deuteron in order to validate calculation method for statistical decay processes. In the result of analysis, it was found out the calculation method adopted in our code system is valid.

Oral presentation

Nuclear-structure calculations for half-lives and beta-delayed neutron-emission probabilities in light neutron-rich nuclei

Utsuno, Yutaka; Yoshida, Sota*; Shimizu, Noritaka*; Otsuka, Takaharu*

no journal, , 

no abstracts in English

Oral presentation

Examination of the decreasing effect on internal exposure by sheltering, 2; Sensitivity analysis

Hirouchi, Jun; Takahara, Shogo; Watanabe, Masatoshi; Munakata, Masahiro

no journal, , 

no abstracts in English

Oral presentation

Examination of the decreasing effect on internal exposure by sheltering, 1; Literature search on variation factors

Watanabe, Masatoshi; Takahara, Shogo; Hirouchi, Jun; Munakata, Masahiro

no journal, , 

no abstracts in English

Oral presentation

Oral presentation

New integral experiment on tungsten using DT neutron at JAEA/FNS

Sato, Satoshi; Kwon, Saerom; Ota, Masayuki; Ochiai, Kentaro; Konno, Chikara

no journal, , 

In order to validate the nuclear data library of tungsten, integral experiments on tungsten with the DT neutron source at JAEA/FNS were performed over 20 years ago. Some calculated reaction rates underestimated the measured ones in the previous study. Background neutrons scattered in the concrete wall of the experimental room are considered to cause these underestimations. In order to reduce background neutrons, we propose a new experimental assembly and perform a new integral experiment on tungsten with the DT neutron source at JAEA/FNS in this study. A rectangular tungsten assembly of 355 mm in height, 355 mm in width and 507 mm in thickness is covered with Li$$_{2}$$O blocks to exclude background neutrons which might affect the measured data. Using activation foils and micro fission chambers, we measure the reaction rates of the $$^{93}$$Nb(n,2n)$$^{92m}$$Nb, $$^{27}$$Al(n,$$alpha$$)$$^{24}$$Na, $$^{115}$$In(n,n')$$^{115m}$$In, $$^{197}$$Au(n,$$gamma$$)$$^{198}$$Au, $$^{186}$$W(n,$$gamma$$)$$^{187}$$W, $$^{235}$$U(n,f) and $$^{238}$$U(n,f) reactions. We analyze the experiment by using MCNP5-1.40 with the recent nuclear data libraries, ENDF/B-VII.1, JEFF-3.2 and JENDL-4. All the calculation results generally show good agreement with the measured ones in this experiment. It is concluded that the nuclear data of tungsten have no problem.

Oral presentation

Development of the three-dimensional atmospheric dispersion model GEARN-FDM by introducing advection and diffusion schemes based on finite difference methods

Kadowaki, Masanao; Terada, Hiroaki; Katata, Genki; Furuno, Akiko; Nagai, Haruyasu

no journal, , 

In case of a nuclear accident or radiological emergency, a simulation with numerical models is a powerful means in order to predict distributions of the polluted air. Although a particle model that WSPEEDI has introduced shows advantage in the synoptic scale, it costs computationally because of the large amount of airborne particles. Moreover, the model has problems with uncertainties in the calculations on long range, due to exponentially increasing errors. For the reason, in this study the atmospheric transport modeling with a finite difference method: GEARN-FDM is proposed in order to improve WSPEEDI. The advection and diffusion in the atmosphere were calculated by using a mass conservative and monotonic manner scheme (Walcek, 2000) and Crank-Nicolson method, respectively. The distributions of tracer were good agreement with the first ETEX measurements. In this session the validation and comparison will be discussed.

Oral presentation

Evaluation of organ doses by using adult Japanese phantoms with various body sizes

Sato, Kaoru; Takahashi, Fumiaki

no journal, , 

Organ doses, which are basis of dose assessment in radiation protection, are derived from ICRP reference phantoms (Male: RCP-AM, Female: RCP-AF) with body physiques of standard Caucasian. In adult, Japanese body physiques are smaller than those of Caucasian. To study impact of application of organ doses of RCP-AM and RCP-AF to dose assessment of adult Japanese, we constructed Japanese male (JM-103) and female (JF-103) phantoms with body physiques of average adult Japanese. In addition, body physiques of adult Japanese have also wide distribution. Therefore, we newly constructed DJM (Male) and DJF (Female) with 8 body physiques by changing bust, chest, waist and hip of JM-103 and JF-103. Organ doses due to external photon irradiation of DJM and DJF were calculated, and were compared with those of RCP-AM and RCP-AF. In ISO geometry at 0.3 MeV and ROT geometry at 0.6 MeV, it was found that colon doses of DJM and DJF with body physiques, which are applicable to most adult Japanese, agreed with those of RCP-AM and RCP-AF within 10 %.

Oral presentation

Fabrication and test results of testing equipment for remote-handling of MA fuel, 1; Testing equipment for fuel cooling

Sugawara, Takanori; Nishihara, Kenji; Tazawa, Yujiro; Tsujimoto, Kazufumi

no journal, , 

This presentation shows fabrication and test results of a testing facility for fuel cooling that is a component of the testing facility for remote-handling of highly-radioactive MA fuels in the transmutation physics experimental facility (TEF-P) planned in the J-PARC. Evaluation formula of pressure drop and temperature increase used in the design of TEF-P was validated by the test, and, feasibility of cooling concept was confirmed.

249 (Records 1-20 displayed on this page)