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Output

The output from the hydraulics computation is written to a MATLAB mat-file with the name
<input_filename>.mt2 and the file is retrieved by issuing the MATLAB command load <input filename>.mt2 -mat in the MATLAB command window. Having retrieved the contents of the mat-file the workspace holds the following variables:

l

A ( $N_{\mbox{\protect\scriptsize tot}} \times 3$) matrix which holds the column vectors $\mbox{$<\!{\hspace{0.2ex}\underline{x}{}\hspace{0.15ex}}\!>$}$ [--], $\mbox{$<\!{\hspace{0.2ex}\underline{\alpha}{}\hspace{0.15ex}}\!>$}$ [--] and $\hspace{0.2ex}\underline{p}{}\hspace{0.15ex}$ [Pa]. The ith element of the vectors represent the value of one of the dependent variables at point i in the computational grid. The integer $N_{\mbox{\protect\scriptsize tot}}$ denotes the total number of grid points in the grid.

l

Vector which holds the total (integral) pressure losses in [Pa] associated with the grid spacers. The order of the vector corresponds to the total number of spacers and the ith element is the pressure loss of the ith grid spacer when counting from the bottom of the core.

l

Vector of order $N_{\mbox{\protect\scriptsize tot}}$ which holds the z-coordinates (relative to the core bottom) in the computational grid [m].

l

Vector of order $N_{\mbox{\protect\scriptsize tot}}-1$ which holds the steplengths in the computational grid [m].

l

Vector of order $N_{\mbox{\protect\scriptsize tot}}$ which holds the bulk liquid temperature at the grid points [ ${}^\circ\mbox{C}$].

l

Specific enthalpy at the point of void departure [J/kg].

l

Z-coordinate at the location of the void departure point [m].

l

The steady-state total primary recirculation mass flow rate [kg/s].

l

Singular pressure change from core to riser flow path [Pa].

l

State vector [$<\!{x}\!>$[--], $<\!{\alpha}\!>$[--],p [Pa]] at the riser inlet.

l

State vector [$<\!{x}\!>$[--], $<\!{\alpha}\!>$[--],p [Pa]] at the riser exit.

l

Singular pressure change from riser to separator flow path [Pa].

l

Pressure change vector which describes the pressure change along the separator flow path. The structure of the pressure change vector is given by

$$[\Delta p_{\mbox{\protect\scriptsize el}}, \Delta p_{\mbox{\... ...riptsize other}} , \Delta p_{\mbox{\protect\scriptsize tot}}]$$ (10.2)

where the subscripts el, fric, loc, other, and tot denote the elevational, frictional, local, other and total pressure changes respectively [Pa].

l

Liquid mass flow rate at the steam separator vapor outlet, $\mbox{$\dot{m}$}_{\ell_1}$ [kg/s].

l

Vapor mass flow rate at the steam separator vapor outlet, $\mbox{$\dot{m}$}_{g_1}$ [kg/s].

l

Liquid mass flow rate at the steam separator liquid outlet, $\mbox{$\dot{m}$}_{\ell_2}$ [kg/s].

l

Vapor mass flow rate at the steam separator liquid outlet, $\mbox{$\dot{m}$}_{g_2}$ [kg/s].

l

Pressure change vector (see (10.2)) which describes the pressure change along the downcomer above feedwater inlet flow path [Pa].

l

Core inlet specific (mixture) enthalpy [J/kg].

l

Liquid density at the core inlet [kg/${\mbox{m}}^3$].

l

Singular pressure change from flow path above the feed water inlet to the downcomer flow path [Pa].

l

Pressure change vector (see (10.2)) which describes the pressure change along the downcomer flow path [Pa].

l

Singular pressure change from downcomer flow path to the lower plenum flow path [Pa].

l

Pressure change vector (see (10.2)) which describes the pressure change along the lower plenum flow path [Pa].

l

Singular pressure change from the lower plenum flow path to the core flow path [Pa].

l

Pressure change due to core plate [Pa].

l

Core inlet subcooling, $h_{\mbox{\protect\scriptsize sub}}$ [J/kg], defined by

$$h_{\mbox{\protect\scriptsize sub}} \;\hbox{$=$\kern-0.68em\... ...e1.1ex \hbox{$\scriptscriptstyle\triangle$}}\;h_f(p_i) - h_i$$ (10.3)

where h_f is the saturation enthalpy [J/kg].

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