Scopul nostru este sprijinirea şi promovarea cercetării ştiinţifice şi facilitarea comunicării între cercetătorii români din întreaga lume.
Autori: I. Tiseanu, T. Craciunescu, A. Moeslang
Editorial: Fusion Engineering and Design, 84, p.1847-1851, 2009.
An inspection procedure to assess the mechanical integrity of IFMIF capsules and rigs during the irradiation campaign is necessary. In a number of experiments, we previously proved that X-ray tomography is a reliable solution for official inspections of the structural integrity of IFMIF complete assemblies before and after various tests (tensile, creep-fatigue, fracture toughness, crack growth, microstructure swelling). The next main challenge is to qualify the transmission microtomography inspection as a tool for non-destructive inspection during maintenance (beam-off) periods and after irradiation campaigns. The influence of the sample gamma radioactivity (produced by neutron activation during irradiation campaigns) on the tomographic reconstruction quality is investigated in this paper. The evaluation is performed for the specific configuration of newly manufactured IFMIF irradiation capsules. Experimental X-ray radiographic data together with simulated gamma radiographic images were considered. Latest activation datawere incorporated. For the numerical simulations, aworking environmentable to provide a realistic numerical simulationwas constructed on the basis of twowell established Monte Carlo computer codes: SIMIND and ITS. The optimal parameters of the collimation system, essential for the investigation of the irradiated samples, were determined. It is proved that transmission tomography is practicable, providing good quality reconstruction which allows accurate geometrical measurements. The procedure developed for tomography of irradiated HFTM can be applied for the inspection of other irradiated structures for which X-ray tomography represents a non-destructive inspection technique (NDT).
Cuvinte cheie: Fusion materials, X-ray microtomography, Irradiated materials, Monte Carlo simulations