Performance of a Depleted Uranium Bed for a Nuclear Fusion Fuel Cycle

Jung, Kyung‐Hoon; Kim, Yeanjin; Chung, Hongsuk; Kang, Hee-Seok; Yun, Sei-Hun; Ahn, Do-Hee

doi:10.1080/15361055.2017.1291250

Cited by 5 publications

(5 citation statements)

References 2 publications

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“…This can be understood by the unfavorable interaction of closed-shell He with surrounding Co and Zr atoms. When ZrCo adsorbs T and becomes ZrCoT3, many T atoms may spontaneously decay into 3 He atoms at T sites. The movement of He may also substitute Zr or Co atoms.…”

Section: Stability Of Helium At 8e Zr Co and H Sitesmentioning

confidence: 99%

“…In contrast, He atoms will migrate away from the 8e site zone, as shown in Figure 2, when He atoms are located at Zr sites. The first, second, When ZrCo adsorbs T and becomes ZrCoT 3 , many T atoms may spontaneously decay into 3 He atoms at T sites. The movement of He may also substitute Zr or Co atoms.…”

Section: Stability Of Helium At 8e Zr Co and H Sitesmentioning

confidence: 99%

“…As discussed in the introduction section, alloying atoms are often added in ZrCo to restrain the disproportionation reaction. Meanwhile, T atoms often spontaneously decay into 3 He atoms in the storage process of T in the form of ZrCoT 3 . Therefore, it is necessary to understand the influence of alloying atoms on the stability of He.…”

Section: Effects Of Alloying Elements At Co Site On Stability Of Heliummentioning

confidence: 99%

“…In our previous work, the effects of almost all transition alloying elements replacing Zr and Co on the anti-disproportionation of ZrCo were considered, and the results show that only Ni substituting for Co, and Fe, Co, Ni, Ru, Pd, Os, and Ir replacing Zr exhibited anti-disproportionation roles [32]. In the storage process of T in the form of hydride, many T atoms spontaneously decay into 3 He atoms, since the half life of T is approximately 12.3 years. There must be many He atoms existing in hydride ZrCoT 3 , and the number of He atoms will gradually increase over time [33].…”

Section: Introductionmentioning

confidence: 98%

“…Gaseous tritium (T) is an important fusion raw material in fusion reactors, and is often saved in metallic uranium, which possesses good properties of charging and releasing T [1][2][3][4]. However, uranium has many defects as well, such as spontaneous combustion after the storage of T, being radioactive, and being easy to pulverize.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Alloy Atoms on Substitution Properties of Hydrogen by Helium in ZrCoH3

et al. 2021

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Intermetallic alloy ZrCo is a good material for storing tritium (T). However, ZrCo is prone to disproportionation reactions during the process of charging and discharging T. Alloying atoms are often added in ZrCo, occupying the Zr or Co site, in order to restrain disproportionation reactions. Meanwhile, T often decays into helium (He), and the purity of T seriously decreases once He escapes from ZrCo. Therefore, it is necessary to understand the influence of alloying atoms on the basic stability property of He. In this work, we perform systematical ab initio calculations to study the stability property of He in ZrCoH3 (ZrCo adsorbs the H isotope, forming ZrCoH3). The results suggest that the He atom will undergo displacements of 0.31 and 0.12 Å when it substitutes for Co and Zr, respectively. In contrast, the displacements are very large, at 0.67–1.09 Å, for He replacing H. Then, we introduce more than 20 alloying atoms in ZrCo to replace Co and Zr in order to examine the influence of alloying atoms on the stability of He at H sites. It is found that Ti, V, Cr, Mn, Fe, Zn, Nb, Mo, Tc, Ru, Ta, W, Re, and Os replacing Co can increase the substitution energy of H by the He closest to the alloying atom, whereas only Cr, Mn, Fe, Mo, Tc, Ru, Ta, W, Re, and Os replacing Co can increase the substitution energy of H by the He next closest to the alloying atom. The influence of the alloying atom substituting Zr site on the substitution energies is inconspicuous, and only Nb, Mo, Ru, Ta, and W increase the substitution energies of H by the He closest to the alloying atom. The increase in the substitution energy may suggest that these alloy atoms are conducive to fix the He atom in ZrCo and avoid the reduction in tritium purity.

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Section: Stability Of Helium At 8e Zr Co and H Sitesmentioning

confidence: 99%

Section: Stability Of Helium At 8e Zr Co and H Sitesmentioning

confidence: 99%

Section: Effects Of Alloying Elements At Co Site On Stability Of Heliummentioning

confidence: 99%