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JAEA Reports

Development of a computer tool to support scenario analysis for safety assessment of HLW geological disposal

Makino, Hitoshi; Kawamura, Makoto; Wakasugi, Keiichiro; Okubo, Hiroo*; Takase, Hiroyasu*

JAEA-Data/Code 2007-005, 67 Pages, 2007/02

JAEA-Data-Code-2007-005.pdf:6.66MB

In this study, based on an improvement method for treatment of FEP interaction a computer tool to support scenario analysis by specialists of performance assessment has been developed. Anticipated effects of this tool are to improve efficiency of complex and time consuming scenario analysis work and to reduce possibility of human errors in this work. This tool also enables to describe interactions among a vast number of FEP's and the related information as interaction matrix, and analysis those interactions from a variety of perspectives.

Journal Articles

EBS modelling for the development of repository concepts tailored to siting environments

Ishiguro, Katsuhiko*; Ueda, Hiroyoshi*; Wakasugi, Keiichiro*; Sakabe, Yasushi*; Kitayama, Kazumi*; Umeki, Hiroyuki; Takase, Hiroyasu*

Engineered Barrier Systems (EBS) in the Safety Case; The Role of Modelling, p.167 - 180, 2007/02

Japanese siting approach calls for volunteer host municipalities for an HLW repository and places particular emphasis on design flexibility. The repository concept should be developed to be tailored to the given siting environments. Starting from the H12 repository concept, NUMO has been examining a range of possible repository design options including EBS. The requirements and strategy of model development for performance assessment and process understanding have been discussed taking into account the step-wise, iterative process of development of repository concepts. The areas further to develop the models and databases in the long-term R&D programme have been identified as a wish list in order to evaluate a range of potential repository concepts, focusing on the near-field for the early stages of development process. Among the issues in the list, NUMO has started the development of a flexible computer code for three-dimensional mass transport model to evaluate various design options and components of the EBS. This tool has been applied for the analysis of the barrier effects of the tunnel plugs placed in fractured rock media.

Journal Articles

Short-range structure of vitreous P$$_{2}$$O$$_{5}$$ by MD simulation

Suzuki, Yoshihiro*; Takase, Keiichi*; Akiyama, Isao*; Suzuya, Kentaro; Umesaki, Norimasa*; Otori, Norikazu*

Materials Transactions, 42(11), p.2242 - 2246, 2001/11

https://doi.org/10.2320/matertrans.42.2242
 Times Cited Count：7 Percentile：47.39(Materials Science, Multidisciplinary)

We have performed the molecular dynamics (MD) simulations for vitreous P$$_{2}$$O$$_{5}$$ using isotropic pair potentials composed only of coulombic and repulsive interaction. The obtained P-O pair distribution function reproduced the two peaks expected from the results of neutron diffraction experiments, in the nearest-neighbor P-O correlation. The neutron-weighted real-space correlation function were also in semi-quantitative agreement with that from the experimental results. The distribution of coordination number for O around P and P around O showed that most P atoms form tetrahedral PO$$_{4}$$ units in the glass and three-fifths of O atoms are bridging oxygen, O$$_{B}$$, and the others are terminal one, O$$_{T}$$. The pair distribution functions for P-O$$_{B}$$ and P-O$$_{T}$$ clarified the PO$$_{4}$$ units have three long P-O$$_{B}$$ bonds and one short P-O$$_{T}$$ bond. We have concluded that the short-range structure for vitreous P$$_{2}$$O$$_{5}$$ agrees well with the picture derived from many experiments.

Oral presentation

Development of pyrochemical reprocessing technology based on Co-electrodeposition method, 12; General overview and electrodeposition test

Myochin, Munetaka; Kofuji, Hirohide; Yamana, Hajimu*; Shirai, Osamu*; Yamamura, Tsutomu*; Umesaki, Norimasa*; Matsuura, Haruaki*; Kajinami, Akihiko*; Iwadate, Yasuhiko*; Otori, Norikazu*; et al.

no journal, , 

no abstracts in English

Oral presentation

Development of a computer tool "${it FepMatrix}$" to support scenario analysis for safety assessment of HLW geological disposal

Makino, Hitoshi; Kawamura, Makoto; Wakasugi, Keiichiro*; Okubo, Hiroo*; Takase, Hiroyasu*

no journal, , 

no abstracts in English

Oral presentation

Evaluation of safety function affected by long-term evolution of sealing system, 2; Scenario development

Mitsuyama, Kazuaki*; Takeda, Masaki; Sugita, Yutaka; Ono, Hirokazu; Wakasugi, Keiichiro*; Takase, Hiroyasu*; Takahashi, Hirokazu*; Hashimoto, Tomoko*

no journal, , 

no abstracts in English

Oral presentation

Evaluation of safety function affected by long-term evolution of sealing system, 3; Transport modeling

Takahashi, Hirokazu*; Takeda, Masaki; Sugita, Yutaka; Ono, Hirokazu; Wakasugi, Keiichiro*; Takase, Hiroyasu*; Mitsuyama, Kazuaki*; Hashimoto, Tomoko*

no journal, , 

no abstracts in English

Oral presentation

Evaluation of safety function affected by long-term evolution of sealing system, 1; Identification and classification of FEPs

Sugita, Yutaka; Takeda, Masaki; Ono, Hirokazu; Wakasugi, Keiichiro*; Takase, Hiroyasu*

no journal, , 

no abstracts in English

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