Increasing public attention to the emergence, transformation and migration of radiocarbon 14C strongly requires the development of quantitative kinetic model that takes into account all these processes. The general model of global carbon circulation (in particular 14C) have been known for over half a century and includes both natural and anthropogenic sources and sinks. Along with the generation of 14C from atmospheric nitrogen by cosmic radiation and radiation arising from nuclear testing one should take into account also flow to the atmosphere from the emissions and discharges of the nuclear fuel cycle plants. Also model must include several reservoirs for carbon dioxide and its derivatives. The main problem was the absence of the information about dwell times or rate constants of migration from one form to another. We had made fitting of published data, concerning both 12C and 14C dynamics in atmosphere and in sea water. Specially adopted version of our rinetic software program was constructel and we had achieved reasonably good agreement betveen imitation models and known measurements. The 70-times diskrepancy betveen generation and decay rates for radiocarbon was explained. Actually the main channel of 14C dissappearance is not decay, but dissolution in sea waters. That means that from formed 9 kg of 14C, all plants, animals and humans can consume only 120 grams, and the rest is carried away to the Ocean by the Great Conveyor. By this reason we deny the Suesse hypothesis, because atmospheric carbon dioxide is diluted not by 14C-free substance (after burning of fossil fuels), but from the source of oceans, which have exactly the same composition and ratio 14C/12C. Multiple numeric experiments with imitation modeling of 14C pulse or permanent input to the environment, had demonstrated the exclusive stability of natural system. It obeys homeostatic principle and resists to any attempts to shift steady state concentration. For instance, even in case of twofold increase of cosmic irradiation, the amount of 14C in atmosphere will rise only few percent during nearest 100 years. So all speculations about extraordinary threat from technogenic 14C from nuclear industry do not have any scientific base.