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Journal Articles

Journal Articles

Radioactive particles emitted at the 1FNPS accident; Overview of insoluble cesium particle

Satou, Yukihiko

Nippon Genshiryoku Gakkai-Shi, 61(6), p.446 - 448, 2019/06

no abstracts in English

Oral presentation

Theoretical model analysis of deuteron-induced spallation reactions on long-lived fission products

Nakayama, Shinsuke; Furutachi, Naoya; Iwamoto, Osamu; Watanabe, Yukinobu*

no journal, , 

In the ImPACT project, deuteron is a first candidate of incident beam for nuclear transmutation of long-lived fission products (LLFPs) and accurate deuteron nuclear data on LLFPs are strongly required. Thus, we have performed theoretical model analysis of deuteron-induced spallation reactions on LLFP with DEURACS, which is the computational code dedicated for deuteron-induced reactions. Through comparison with measured data and other calculation method, the applicability of DEURACS to spallation reactions and the role of breakup processes in the reactions will be discussed.

Oral presentation

Bio-corrosion of carbon steel in compacted buffer materials

Nagaoka, Toru*; Hirano, Shinichi*; Matsumoto, Norio*; Amano, Yuki

no journal, , 

no abstracts in English

Oral presentation

Nuclear resonance fluorescence measurement of Al-27 using polarized $$gamma$$-rays

Shizuma, Toshiyuki; Omer, M.; Hajima, Ryoichi; Koizumi, Mitsuo

no journal, , 

no abstracts in English

Oral presentation

Needs for neutron source and nuclear data in developments of an active neutron non-destructive system

Toh, Yosuke; Maeda, Makoto; Tsuchiya, Harufumi; Ozu, Akira; Furutaka, Kazuyoshi; Kitatani, Fumito; Komeda, Masao

no journal, , 

no abstracts in English

Oral presentation

Development of active neutron DDA system for nuclear non-proliferation and nuclear security; Effect of neutron absorber sheet

Ozu, Akira; Maeda, Makoto; Komeda, Masao; Toh, Yosuke

no journal, , 

no abstracts in English

Oral presentation

Advancement of airborne radiation measurement technology, 2; Simulations of unmanned helicopter and LaBr$$_{3}$$(Ce) detector used for estimating radiocesium distribution in soil

Malins, A.; Ochi, Kotaro; Nakasone, Takamasa*; Yamada, Tsutomu*; Machida, Masahiko; Kurikami, Hiroshi; Saito, Kimiaki; Sanada, Yukihisa

no journal, , 

Here we report PHITS Monte Carlo simulations of a LaBr$$_{3}$$(Ce) gamma spectroscopy system used in unmanned helicopter radiation surveys in Fukushima Prefecture. The simulated spectra were verified against measurements taken under controlled laboratory conditions. Simulations were used to characterize the peak-to-Compton method for estimating the vertical distribution of radiocesium in soil from airborne surveys.

Oral presentation

Application of sorption model to uranium sorption onto montmorillonite in the presence of carbonate

Sugiura, Yuki; Tachi, Yukio; Suyama, Tadahiro*; Hamamoto, Takafumi*

no journal, , 

no abstracts in English

Oral presentation

Incident neutron energy dependence of delayed neutron yields using the latest decay data

Minato, Futoshi

no journal, , 

no abstracts in English

Oral presentation

Simulations of radiocesium discharge from Abukuma River with improved cesium wash-off model

Liu, X.; Machida, Masahiko; Kurikami, Hiroshi; Kitamura, Akihiro

no journal, , 

The present work aims to improve the Soil and Cesium Transport (SACT) model, which has been developed for simulating radiocesium redistribution after the Fukushima accident. Two mechanisms, namely, vertical migration, and long-term fixation of radiocesium in soil have been newly implemented. Without parameter tuning, the new SACT model shows improved agreement with measurement results.

Oral presentation

Theoretical study of selective cesium complexation mechanism by fungi organic matter

Suno, Hiroya; Machida, Masahiko; Dohi, Terumi

no journal, , 

no abstracts in English

Oral presentation

Experimental and modelling results of in-situ Long-Term Diffusion test in granodiorite matrix at Grimsel Test Site

Fukatsu, Yuta; Ito, Tsuyoshi*; Tachi, Yukio; Ishida, Keisuke*; Martin, A.*

no journal, , 

no abstracts in English

Oral presentation

Viscosity of interlayer water in montmorillonite from molecular dynamics method

Yotsuji, Kenji*; Tachi, Yukio; Kawamura, Katsuyuki*

no journal, , 

We used molecular dynamics method to study the diffusivity of water and counterions and the viscosity of interlayer water in montmorillonite clay minerals.

Oral presentation

Basic research programs of vitrification technology for waste volume reduction, 58; Construction of thermodynamic database of Ru-Rh-Pd-SiO$$_{2}$$-B$$_{2}$$O$$_{3}$$-Na$$_{2}$$O-Li$$_{2}$$O system

Amamoto, Ippei; Oyama, Koichi; Fukayama, Daigen*; Nagano, Yuichi*; Hack, K.*; Jantzen, T.*

no journal, , 

The thermodynamic data of glass medium and FP, essential for estimation of the technical development of HLW as vitrified waste, is obtained by the CALPHAD method. As Ru-Rh-Pd-SiO$$_{2}$$-B$$_{2}$$O$$_{3}$$-Na$$_{2}$$O-Li$$_{2}$$O system could be constructed this time, it became possible to construct the phase diagram and/or estimation of FP loading amount under various conditions.

Oral presentation

Development of seismic counter measures against cliff edges for enhancement of comprehensive safety of nuclear power plants, 15; Cliff-edge elimination technology for reactor vessel and piping

Yamano, Hidemasa; Nishida, Akemi; Choi, B.; Takada, Tsuyoshi*

no journal, , 

The authors have evaluated the fragility of a reactor vessel and piping based on the response waveforms of the reactor building obtained through an earthquake response analysis. Additionally, this study has conducted quantitative evaluation on the response mitigation effect of the vessel and piping by introducing seismic isolation to the building as a preventive measure against a cliff-edge effect.

Oral presentation

In-situ mock-up test on the hydrochemical influence of cement material to groundwater

Iwatsuki, Teruki; Murakami, Hiroaki; Watanabe, Yusuke; Fukuda, Kenji

no journal, , 

Drift closure test was carried out to understand the hydrochemical influence of cement materials to groundwater in Mizunami Underground Research Laboratory. In the end, the amount of cement material including portlandite to evolve the alkaline groundwater was quantitatively estimated 0.5mm depth of shotcrete.

Oral presentation

A Visualization test for fragmentation behavior of molten stainless steel discharged into a sodium pool

Emura, Yuki; Isozaki, Mikio; Matsuba, Kenichi; Kamiyama, Kenji

no journal, , 

In core-disruptive accidents of sodium-cooled fast reactors, molten-core materials are discharged into a lower part of reactor vessel and are mixed with sodium there. In this study, molten stainless steel was poured into sodium and its behavior in the sodium was observed by a visualization system using X-ray.

Oral presentation

Study on vitrification plan of high level liquid waste in the TVF, 6; Details of optimized strainer design for the next glass melter

Asahi, Yoshimitsu; Shimamura, Keisuke; Kobayashi, Hidekazu; Kodaka, Akira; Morikawa, Yo

no journal, , 

no abstracts in English

253 (Records 1-20 displayed on this page)