Features of the in-situ experiments on studying of tritium release from lithium ceramic Li2TiO3 using vacuum extraction method

Kulsartov, T.; Shaimerdenov, A.A.; Zaurbekova, Zhanna; Kenzhina, I.; Chikhray, Y.; Ķizāne, Gunta; Blynskiy, Petr; Akhanov, Assyl; Ponkratov, Yu.V.

doi:10.1016/j.fusengdes.2021.112703

Cited by 19 publications

(7 citation statements)

References 10 publications

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“…The results of the presented reactor experiment have been partially considered in [4][5][6][7]. In [4], the initial section of the experiment (the stepwise output section of the reactor) was analyzed; it was shown that the tritium release occurred in the form of HT and T 2 molecules.…”

Section: Results Of the Reactor Experimentsmentioning

confidence: 99%

“…Further, as can be seen from Figure 3, the pressure changes in gases with the mass number M4 in the course of the experiments were characterized by frequent peaks relative to a certain trend level. In previous works [4][5][6][7], it was assumed that such a peak release of gases with the mass number M4 was due to methodological peculiarities of measurements, and the peak releases themselves were not analyzed (only the lower trend of release was). However, later, in [8,10], it was shown that this release is associated with helium peak releases from ceramics.…”

Section: Results Of the Reactor Experimentsmentioning

confidence: 99%

“…In these studies, two mass spectrometers were used at selected time intervals in the experiment in order to exclude methodologically determined errors in the measurements. Further, in [5], the release pattern of tritium-containing molecules over the entire irradiation period was analyzed; it was found that tritium was released uniformly, except in sections where the irradiation conditions changed noticeably. When returning to normal irradiation conditions, the fluxes of released gases also returned to some trend values.…”

Section: Results Of the Reactor Experimentsmentioning

confidence: 99%

“…This study was a continuation of research [4][5][6][7] regarding tritium and helium release from lithium metatitanate Li 2 TiO 3 with 96% 6 Li during irradiation at the WWR-K research reactor using the vacuum extraction method. Thus, in [4], the initial section of the experiment (the stepwise increase in reactor power) was analyzed; it was shown that the release of tritium occurred in the form of HT and T 2 molecules.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, in [4], the initial section of the experiment (the stepwise increase in reactor power) was analyzed; it was shown that the release of tritium occurred in the form of HT and T 2 molecules. In [5], the nature of tritium-containing molecules release was analyzed over the entire period of irradiation; it was found that tritium was released uniformly, except for areas where the irradiation conditions changed noticeably. In [6,7], the parameters of the Arrhenius dependence of the tritium effective diffusion coefficient were estimated during a sample's heating at a stationary reactor power and during short-term (5-10 min) reactor power reductions.…”

Section: Introductionmentioning

confidence: 99%

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Features of Helium and Tritium Release from Li2TiO3 Ceramic Pebbles under Neutron Irradiation

Kulsartov,

Zaurbekova,

Chikhray

et al. 2023

Materials

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The operation of fusion reactors is based on the reaction that occurs when two heavy hydrogen isotopes, deuterium and tritium, combine to form helium and a neutron with an energy of 14.1 MeV D + T → He + n. For this reaction to occur, it is necessary to produce tritium in the facility itself, as tritium is not common in nature. The generation of tritium in the facility is a key function of the breeder blanket. During the operation of a D–T fusion reactor, high-energy tritium is generated as a result of the 6Li(n,α)T reaction in a lithium-containing ceramic material in the breeder blanket. Lithium metatitanate Li2TiO3 is proposed as one of the promising materials for use in the solid breeder blanket of the DEMO reactor. Several concepts for test blanket modules based on lithium ceramics are being developed for testing at the ITER reactor. Lithium metatitanate Li2TiO3 has good tritium release parameters, as well as good thermal and thermomechanical characteristics. The most important property of lithium ceramics Li2TiO3 is its ability to withstand exposure to long-term high-energy radiation at high temperatures and across large temperature gradients. Its inherent thermal stability and chemical inertness are significant advantages in terms of safety concerns. This study was a continuation of research regarding tritium and helium release from lithium metatitanate Li2TiO3 with 96% 6Li during irradiation at the WWR-K research reactor using the vacuum extraction method. As a result of the analysis of experiments regarding the irradiation of lithium metatitanate in vacuum conditions, it has been established that, during irradiation, peak releases of helium from closed pores of the ceramics are observed, which open during the first 7 days of irradiation. The authors assumed that the reasons samples crack are temperature gradients over the ceramic sample, resulting from the internal heating of pebbles under the conditions of their vacuum evacuation, and contact with the bottom of the evacuated capsule. The temperature dependence of the effective diffusion coefficient of tritium in ceramics at the end of irradiation and the parameters of helium effusion were also determined.

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