Hydriding and dehydriding characteristics of small-scale DU and ZrCo beds

Materials-related issues in the safety and licensing of nuclear fusion facilities

“…In this mode the tritium inventories are confined and the facility is passively safe from most credible accidents. To date, depleted uranium has proven to be the most effective tritium storage medium because of its absorption and regeneration efficiency [51]. However, uranium is pyrophoric and any ingress-of-air accident could possibly cause the bed to heat and release the tritium stored on the bed.…”

Initial decomposition mechanisms and the inverse effects of temperature and PH2 on the thermodynamic stability of UH3

“…1 Since this hydriding reaction is reversible and UH 3 can decompose to metal U and H 2 upon heating, 1 U has been also used as the storage medium for hydrogen and especially its isotopes (deuterium and tritium) in handling facilities. 1–6 Therefore, investigations of the decomposition mechanism and thermodynamic stability of uranium hydride are critical to industrial applications of hydrogen isotope separation 6 and scientific studies on corrosion science of U. 7…”

“…1 Since this hydriding reaction is reversible and UH 3 can decompose to metal U and H 2 upon heating, 1 U has been also used as the storage medium for hydrogen and especially its isotopes (deuterium and tritium) in handling facilities. [1][2][3][4][5][6] Therefore, investigations of the decomposition mechanism and thermodynamic stability of uranium hydride are critical to industrial applications of hydrogen isotope separation 6 and scientific studies on corrosion science of U. 7 The thermal decomposition properties of UH 3 , namely, UH 3 dehydrogenates and releases H 2 molecules into the environment under certain temperature (T) and hydrogen pressure (P H 2 ) conditions (P H 2 -C-T), have been explored by early experiments, especially the well-known relationship between P H 2 of the plateau region and T (van't Hoff curve).…”

“…Here u H 2 (T, P H 2 ) is the chemical potential of H 2 . Under the approximation of an ideal gas, the chemical potential of H 2 is shown as eqn(3), in which k B and P H 2 represent the Boltzmann constant and partial pressure of H 2 , respectively. DH H 2 and DS H 2 in eqn (4) are the changes of enthalpy and entropy of H 2 at standard state pressure P 0 27.…”

Experimental study on full-scale ZrCo and depleted uranium beds applied for fast recovery and delivery of hydrogen isotopes

“…The numerical investigation showed that the heat released during hydrogen absorption could be effectively removed to the ambient coolant [13]. Chung et al [14] tested the performances of a small-scale bed mock-up and found that rapid hydrogen recovery and delivery rates could be obtained in the thin double-layered annulus metal hydride bed.…”