Temperature dependence of the rate constant of hydrogen isotope interactions with a lithium capillary-porous system under reactor irradiation

•The experiments with Li CPS sample were carried out at reactor IVG-1.M.•The gas absorption technique was used to study hydrogen isotope interaction with lithium CPS.•The temperature dependence of constants of interaction rate was obtained for various power rates of the reactor.•Determination of the activation energies, and pre-exponents of Arrhenius dependence.•The effect of increase of the rate constant under reaction irradiation. Experiments with a sample of a lithium capillary-porous system (CPS) were performed at the reactor IVG-1.M of the Institute of Atomic Energy NNC RK to study the effects of neutron irradiation on the parameters of hydrogen isotope interactions with a lithium CPS. The absorption technique was used during the experiments, and this technique allowed the temperature dependences of the hydrogen isotope interaction rate constants with the lithium CPS to be obtained under various reactor powers. The obtained dependencies were used to determine the main interaction parameters: the activation energies and the pre-exponents of the Arrhenius dependence of the hydrogen interaction rate constants with lithium and the lithium CPS. An increase of the hydrogen isotope interaction rate with the lithium CPS was observed under reactor irradiation.