Abstract
The fission gas activity monitors are used to detect the fission gas migrated to the cover gas plenum. The cladding of fuel element is one of the most important protective barriers. If the failure occurs on fuel pin, the fission gas released from the failed pin into coolant will lead to the increase of radioactivity level of the primary coolant. And in sodium-cooled fast reactor, the fission gas will transport from coolant into reactor cover gas plenum. In this work, according to the fission gas monitoring data from the cover gas, the models of fission gas release and migration as well as program are established based on MATLAB code. The number of failed fuel pins can be calculated by this program in different power, which can discover the fuel failure in time and evaluate the failure; it is very significant to the safety of reactor operation.
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