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Download VICTORIA : a mechanistic model of radionuclide behavior in by T J Heames; U.S. Nuclear Regulatory Commission. Office of PDF

By T J Heames; U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research. Division of Systems Research.; Sandia National Laboratories.; et al

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Extra info for VICTORIA : a mechanistic model of radionuclide behavior in the reactor coolant system under severe accident conditions

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Exists means that one cannot choose any set of n chemicafhpotentials to eliminate the k.. Indeed, one must choose a set whose corresponding species arJe linearly independent in the sense that all other species can be made from linear combinations of them. 7]. 3f are not linearly independent. ) The outcome is that the ne k. can be expressed as linear combinations of the Hap j. 6) also remains valid ' except A.. becomes a square matrix of . e This simplifles the calculation because there are now fewer unknowns in the final equations.

11) In order to discretize this equation, we need to stipulate indices for the cells over which the equation is being solved. 2. 2 shows, the r,z spatial coordinate indices are m,n respectively, and the notation m+, n+ or m-, n- is shorthand for m+I/2, n+I/2 or m-I/2, n-I/2, respectively. II) in both time 3-10 and space. +_n rm. component is = _ro,n+ _ m,n+ Zn+- The inner differential boundary in question. Dci _ m,nZn_ terms are given For each species I Cm+l -Im+,n = rm+l 8r ,, Dc c ] I I Dr " _ - r m-,n -8ci _Z DC.

I is small because the power rapidly (_. is 4 in VICTORIA) calculated economlcally from Equation . can series expansions and therefore AG. 21). be formed. 2]) for all 1 e e. this to yield a, CI = l leg ailR i H c. 24) a. + E iec • ai lR ir] c. ij nc/n o j J V is V - V where w_ch is a f_nction H k V is the volume of Cni for all i e {V/Vgas }aik of c. the So, . condensed phase the unknowns in these for the j 6 sum e, _V-_s,the and mole n . fractions na is determined By the equations requirementare c.

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