Recommendations on fuel properties for fuel performance codes

Chauvin, N.*; Martin, P.*; Ogata, Takanari*; Calabrese, R.*; Janney, D.*; Hirooka, Shun; Kato, Masato; Staicu, D.*; McClellan, K.*; White, J.*; et al.

NEA/NSC/R(2024)1 (Internet), 289 Pages, 2025/07

no abstracts in English

Spin pumping into carbon nanotubes

Fukuzawa, K.*; Kato, Takeo*; Matsuo, Mamoru; Jonckheere, T.*; Rech, J.*; Martin, T.*

Physical Review B, 108(13), p.134429_1 - 134429_9, 2023/10

https://doi.org/10.1103/PhysRevB.108.134429

Compositional and structural analysis of Fukushima-derived particulates using high-resolution X-ray imaging and synchrotron characterisation techniques

Martin, P. G.*; Jones, C. P.*; Cipiccia, S.*; Batey, D. J.*; Hallam, K. R.*; Satou, Yukihiko; Griffiths, I.*; Rau, C.*; Richards, D. A.*; Sueki, Keisuke*; et al.

Scientific Reports (Internet), 10, p.1636_1 - 1636_11, 2020/01

https://doi.org/10.1038/s41598-020-58545-y

Effects of fine-scale surface alterations on tracer retention in a fractured crystalline rock from the Grimsel Test Site

Tachi, Yukio; Ito, Tsuyoshi*; Akagi, Yosuke*; Sato, Hisao*; Martin, A. J.*

Water Resources Research, 54(11), p.9287 - 9305, 2018/11

https://doi.org/10.1029/2018WR023145

Effects of fine-scale surface alterations on radionuclide migration in fractured crystalline rocks were investigated by a comprehensive approach coupling a series of laboratory tests, microscopic observations and modelling, using a single fractured granodiorite sample from the Grimsel Test Site, Switzerland. Laboratory tests including through-diffusion, batch sorption and flow-through tests using five tracers indicated that tracer retention was consistently in the sequence of HDO, Se, Cs, Ni, Eu, and as well as showing the existence of a diffusion-resistance layer near the fracture surface, cation excess and anion exclusion effects for diffusion. Microscale heterogeneities in structural properties around the fracture were clarified quantitatively by coupling X-ray CT and EPMA. A three layer model including weathered vermiculite, foliated mica and undisturbed matrix layers, and their properties such as porosity, sorption and diffusion parameters, could provide a reasonable interpretation for breakthrough curves and concentration distributions near fracture surface of all tracers, measured in flow-through tests.

Matrix diffusion and sorption of Cs, Na, I and HTO in granodiorite; Laboratory-scale results and their extrapolation to the in situ condition

Tachi, Yukio; Ebina, Takanori*; Takeda, Chizuko*; Saito, Toshihiko*; Takahashi, Hiroaki*; Ouchi, Yuji*; Martin, A. J.*

Journal of Contaminant Hydrology, 179, p.10 - 24, 2015/08

https://doi.org/10.1016/j.jconhyd.2015.05.003

Matrix diffusion and sorption are important processes in the assessment of radionuclide transport in crystalline rocks. Diffusion and sorption parameters for Cs, Na, I and HTO were determined by through-diffusion and batch sorption experiments using granodiorite samples from the Grimsel Test Site, Switzerland. The De values were in the order Cs, Na, HTO, I. The capacity factor and Kd values show the same trends. The dual depth profiles for Cs and Na can be interpreted by a near-surface Kd increment. The microscopic analysis indicated that this is caused by high porosity and sorption capacities in disturbed biotite minerals on the sample surface. The Kd values derived from the dual profiles are likely to correspond to Kd dependence on the grain sizes of crushed samples in the batch experiments. The results of the in situ LTD experiments were interpreted reasonably well by using transport parameters derived from laboratory data and extrapolating them to in situ conditions.

Modeling of an in-situ diffusion experiment in granite at the Grimsel Test Site

Soler, J. M.*; Landa, J.*; Havlov, V.*; Tachi, Yukio; Ebina, Takanori*; Sardini, P.*; Siitari-Kauppi, M.*; Martin, A. J.*

Materials Research Society Symposium Proceedings, Vol.1665, p.85 - 91, 2014/09

https://doi.org/10.1557/opl.2014.632

Matrix diffusion is a key process for radionuclide retention in crystalline rocks. An in-situ diffusion experiment in granite matrix was performed at the Grimsel Test Site (Switzerland). Several tracers (HTO, Na, Cs) were circulated through a borehole and the decrease in tracer concentrations was monitored for 2.5 years. Then, the borehole section was overcored and the tracer profiles in the rock were analyzed. Transport distances in the rock were 20 cm for HTO, 10 cm for Na and 1 cm for Cs. The dataset was analyzed with diffusion-sorption models by different teams using different codes, with the goal of obtaining effective diffusivities (e) and rock capacity factors. There was a rather good agreement between the values from different teams, implied that e and capacity factors in the borehole damaged zone are larger than those in the bulk rock. However, HTO seems to display large discrepancies between measured and modeled results, which have to be investigated in more detail.

Application of the Bayesian approach to incorporate helium isotope ratios in long-term probabilistic volcanic hazard assessments in Tohoku, Japan

Martin, A. J.*; Umeda, Koji; Ishimaru, Tsuneari

Updates in Volcanology; New Advances in Understanding Volcanic Systems (Internet), p.119 - 148, 2012/09

https://doi.org/10.5772/51859

The probabilistic approach can be developed with quite high levels of confidence and take into account extreme volcanic events. However, for regions with few or no volcanoes, there is a need to include additional geological, geophysical and/or geochemical data sets that may indicate the likelihood of future volcanism. This has been achieved using Bayesian inference in order to combine one or more sets of chemical or geophysical information to a priori assumptions of volcano spatio-temporal distributions yielding modified a posteriori probabilities.

Space environmental effects on MoS and diamond-like carbon lubricating films; Atomic oxygen-induced erosion and its effect on tribological properties

Tagawa, Masahito*; Yokota, Kumiko*; Matsumoto, Koji*; Suzuki, Mineo*; Teraoka, Yuden; Kitamura, Akira*; Belin, M.*; Fontaine, J.*; Martin, J. M.*

Surface & Coatings Technology, 202(4-7), p.1003 - 1010, 2007/12

https://doi.org/10.1016/j.surfcoat.2007.07.069

Effects of 5 eV atomic oxygen beam on MoS and diamond-like carbon (DLC) lubrication films are evaluated relevance to space environmental effects in the low Earth orbit. X-ray photoelectron spectra indicate that the loss of S atoms and Mo oxidation at the atomic oxygen irradiated MoS is significant. Depth profiles of S and Mo indicate that the oxidation is restricted within 3 nm from the surface. This is due to the fact that Mo oxide plays as a protective layer against further oxidation. The surface oxidation affects the friction coefficient. However, due to the delamination of oxide layer, wear-life of the film is reduced in some conditions. In contrast, no sever oxidation states of C atoms are detected at DLC surface. However, the loss of DLC itself is measured by Rutherford backscattering spectroscopy. It is concluded that the protection of DLC film is mandatory for the use of DLC in the LEO space applications.

Demonstrating feasible disposable concepts for long half-life, low heat generating radioactive wastes in Japan; An overview of project TRU-2

Martin, A. J.*; Kamei, Gento; Shiotsuki, Masao; Kuroda, Shigeki*

Proceedings of International Waste Management Symposium 2007 (WM '07) (CD-ROM), 12 Pages, 2007/03

In Japan, the Federation of Electric Power Companies and The Japan Atomic Energy Agency have been collaborating with relevant organizations to promote generic R&D for the safe geological disposal of TRU waste based on the technical achievements in Japan's HLW disposal program. A result of this collaborative effort was production of a recent progress report on the R&D for TRU waste disposal in Japan (project TRU-2). This paper is an overview of TRU-2 describing the key results and some unique methodologies developed.

Modeling long-term volcanic hazards through Bayesian inference; An example from the Tohoku volcanic arc, Japan

Martin, A. J.*; Umeda, Koji; Conner, C. B.*; Weller, J. N.*; Zhao, D.*; Takahashi, Masaki*

Journal of Geophysical Research; Solid Earth, 109(B10), p.B10208_1 - B10208_20, 2004/10

https://doi.org/10.1029/2004JB003201

We achieve this using Bayesian inference in order to combine one or more sets of information (geophysical data) to a priori assumptions of volcano spatio-temporal distributions yielding modified a posteriori probabilities.