Source Term Code Package

Figure 7.1. Source Term Code Package (Soffer, 1991)...

The code Iode has been developed to calculate iodine behavior in a reactor containment and the auxiliary building it is part of the French computer system Escadre which, similar to the US Source Term Code Package, describes the whole sequence of a severe reactor accident. The general philosophy of Iode is to model the main phenomena which may influence the behavior of iodine in the reactor containment IS chemical reactions are modelled, concerning both the water phase and the gas phase (Gauvain et al., 1991). Similar to Impair, radiolysis is not described in detail but is taken into account over its global effect on iodine species. The kinetic data of the reactions were taken from the literature as far as inorganic iodine thermal reactions are concerned other kinetic data were compiled from the elaboration of the Impair 2 code. 

Two fission product release models have been used e)ctensively in the analysis and comparison of our results. The fractional release rate model, as described in NUEEG-0772, is used in the CORSOR-M code. This simple model has been the generally accepted standard used in the NRC Source Term Code Package for about 10 yeais. The basic equations for this model are... 

J. A. Gieseke et al., "Source Term Code Package A User s Guide,"... 

CARM is a software package developed by Prof. J.-Y. Chen of UC, Berkeley, that automatically creates reduced chemical kinetic mechanisms starting with a detailed mechanism and a set of input problems representing the conditions under which the mechanism is to be used (Reaction-Engineering-Intemational 2014). CARM is an acronym of Computer Assisted Reduction Method . The output of CARM is a Fortran subroutine that gives the chemical source terms for each species in the reduced mechanism as a function of the temperature, pressure and species mass fractions. This subroutine can be used in a CFD code or in simpler applications such as those associated with the CHEMKIN package. Application of CARM was reported by Sung et al. (2001). 

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