Code Manual for CONTAIN 2.0 - Federation of American Scientists

Table 4-3
Conservation of Mass Equation for the Atmosphere in Cell i (Continued)
Wboi,= pool boiling rate calculated by the implicit flow solver, see Section 4.4.6;
Wpa = flow rate into the atmosphere of cell i from flow paths that are submerged in i
This rate takes into account the equilibration of the flow in the pool as discussec
in Section 4.4.7.
w ex,so = mass transfer rates into the atmosphere from explicit processes
= Wbn,,o+ Wud,,o+ Wwboil + Ww ~+ w~Rv ~
w bn,so = rate of water vapor and/or COZ production and (negative) rate oj
removal of the reactant gases as a result of deflagration bums, see
Section 9.1;
w – user-defined mass addition rate for component k;
ud,so —
w L.C,boil = pool boiling rate calculated by the lower cell, as when the pool is
boiled off in the current timestep, see Section 4.4.6, or when the
explicit (Runge-Kutta) flow model is used;
wLc,g = production rate of gases and coolant vapor from core-concrete
interactions (CCIS) modeled with CORCON ( see Chapter 5),
This rate takes into account the effect of any equilibration of the
gas or vapor with an overlying coolant pool, as discussed in
Section 11.3;
w SRV,g = safety relief valve (SRV) or sparger model mass addition rate to
the atmosphere, as discussed in Section 11.3. This rate takes into
account any equilibration of the gas, vapor, or homogeneously
dispersed liquid with the pool when the spmger is submerged and
liquid-vapor phase separation modeling when the sparger is not
submerged;
W~X,Si = mass transfer rates out of the atmosphere from explicit processes (this term also
includes evaporation into the atmosphere, with a negative sign)
= We,,cond+ w, ~ond+ Wh ~ond+ Wp ~ond+ Wtiop
w es,cond = condensation rate of vapor as a result of engineered systems
operation, see Chapter 12;
Rev O 428 6/30/97