Development of the Tritium Transport Model for Pebbles of Li₂TiO₃

Abstract

Tritium transport code in Li 2 TiO 3 pebbles were developed in this study. In the simulation code, tritium transports in a grain, a closed-pore and an opened-pore were modeled and combined. The tritium transport in grain was modeled by the tritium diffusion, trapping/detrapping by defects, and the annihilation process of defects. The adsorption/desorption equilibrium of diffusing tritium gas molecule was modeled for the tritium transports in opened-pores. A vacant-core and shell model was used to model the tritium transport in closedpores. The results by simulation code suggested that the tritium trapping by closed-pores would result in the shift of tritium release toward higher temperature side as dissociation of tritium gas molecule in closed-pores requires higher activation energy.

Study on the chemical compatibility between Li2TiO3 ceramic pebbles and diverse advanced structural materials

“…Therefore, the defects will be introduced in the Li 2 TiO 3 ceramic pebbles at 700 °C under He+0.1 % H 2 atmosphere, which is consistent with previous reports. Many researchers also believe that the release of tritium goes through the capture and elimination of the defect after neutron irradiation and tritium desorption spectroscopy 27–29 …”

“…Many researchers also believe that the release of tritium goes through the capture and elimination of the defect after neutron irradiation and tritium desorption spectroscopy. [27][28][29] To investigate whether the crystal structure of Li 2 TiO 3 ceramic pebbles changes after contacting four different structural materials under He+0.1% H 2 atmosphere. Figure 5 shows the X-ray diffraction (XRD) patterns of Li 2 TiO 3 ceramic pebbles heated at 700 • C for 300 h. It can be seen that the XRD patterns of Li 2 TiO 3 ceramic powder can well correspond to the JCPDS Card No.…”

Fundamental Study on Fretting Corrosion in Solid Breeder Blanket

“…Table 2 presents major features of small pebble specimens. The Li 2 TiO 3 pebble has a porous structure, in which the release of tritium from the pebble is promoted [12]. The fretting behaviors between the pebble and the plate were c 2021 The Japan Society of Plasma Science and Nuclear Fusion Research 2405032-1…”

Numerical analysis of deuterium migration behaviors in tungsten damaged by fast neutron by means of gas absorption method

“…The code solves the one-dimensional McNabb-Foster equation for deuterium in tungsten containing trapping sites [23]. The detail of this code can be found elsewhere [24][25]. The kinetic parameters for the elementary steps of deuterium migration in tungsten, such as diffusion and recombination processes, were the same as our previous study [24].…”