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Input

The command line arguments passed to the neutronics implementation described in section 3.6.1.1 are also used for the hydraulics implementation (of course the cross section path is not used by the hydraulics implementation).

As for the neutronics implementation the major part of the input is passed to the code by means of an input file. The syntax of the input file corresponds to the syntax of the neutronics input file described in section 3.6.1.2. The code assumes that the extension of the input file is .hyd, ie the code tries to read a file with the name <input filename>.hyd where <input filename> is passed through the command line.

The contents of the hydraulics input file is listed below (in chronological order)

.

1st segment: Reactor geometry.

)

The number of fuel elements, $N_{\mbox{\protect\scriptsize elm}}$.

)

Elevational data (see Figure 5.1).

• Exit of the downcomer, $z_{\mbox{\protect\scriptsize lower}}$ [m].
• Core inlet, $z_{\mbox{\protect\scriptsize c,bot}}$ [m].
• Separator inlet, $z_{\mbox{\protect\scriptsize sep}}$ [m].
• Feedwater inlet, $z_{\mbox{\protect\scriptsize feed}}$ [m].
• Water liquid level, $z_\ell$ [m].
• Separator exit, $z_{\mbox{\protect\scriptsize sep,top}}$ [m].

)

Riser (flow path ) specifications.

• Equivalent hydraulic diameter, $D_{e,{\framebox[1.5ex]{\raisebox{-2.2pt}[0pt][0ex]{\scriptsize 2}}}}$ [m].
• Cross-sectional flow area, $A_{c,{\framebox[1.5ex]{\raisebox{-2.2pt}[0pt][0ex]{\scriptsize 2}}}}$ [${\mbox{m}}^2$].
• Equivalent roughness of wetted surfaces, $\epsilon_{\framebox[1.5ex]{\raisebox{-2.2pt}[0pt][0ex]{\scriptsize 2}}}$ [m].

)

Steam separator (flow path ) specifications.

• Equivalent hydraulic diameter, $D_{e,{\framebox[1.5ex]{\raisebox{-2.2pt}[0pt][0ex]{\scriptsize 3}}}}$ [m].
• Cross-sectional flow area, $A_{c,{\framebox[1.5ex]{\raisebox{-2.2pt}[0pt][0ex]{\scriptsize 3}}}}$ [${\mbox{m}}^2$].
• Local loss coefficient, $K_{\framebox[1.5ex]{\raisebox{-2.2pt}[0pt][0ex]{\scriptsize 3}}}$ [--].
• Equivalent roughness of wetted surfaces, $\epsilon_{\framebox[1.5ex]{\raisebox{-2.2pt}[0pt][0ex]{\scriptsize 3}}}$ [m].

)

Downcomer above feedwater inlet (flow path ) specifications.

• Equivalent hydraulic diameter, $D_{e,{\framebox[1.5ex]{\raisebox{-2.2pt}[0pt][0ex]{\scriptsize 4}}}}$ [m].
• Cross-sectional flow area, $A_{c,{\framebox[1.5ex]{\raisebox{-2.2pt}[0pt][0ex]{\scriptsize 4}}}}$ [${\mbox{m}}^2$].
• Local loss coefficient, $K_{\framebox[1.5ex]{\raisebox{-2.2pt}[0pt][0ex]{\scriptsize 4}}}$ [--].
• Equivalent roughness of wetted surfaces, $\epsilon_{\framebox[1.5ex]{\raisebox{-2.2pt}[0pt][0ex]{\scriptsize 4}}}$ [m].

)

Downcomer (flow path ) specifications.

• Equivalent hydraulic diameter, $D_{e,{\framebox[1.5ex]{\raisebox{-2.2pt}[0pt][0ex]{\scriptsize 5}}}}$ [m].
• Cross-sectional flow area, $A_{c,{\framebox[1.5ex]{\raisebox{-2.2pt}[0pt][0ex]{\scriptsize 5}}}}$ [${\mbox{m}}^2$].
• Local loss coefficient, $K_{\framebox[1.5ex]{\raisebox{-2.2pt}[0pt][0ex]{\scriptsize 5}}}$ [--].
• Equivalent roughness of wetted surfaces, $\epsilon_{\framebox[1.5ex]{\raisebox{-2.2pt}[0pt][0ex]{\scriptsize 5}}}$ [m].

)

Lower plenum (flow path ) specifications.

• Equivalent hydraulic diameter, $D_{e,{\framebox[1.5ex]{\raisebox{-2.2pt}[0pt][0ex]{\scriptsize 6}}}}$ [m].
• Cross-sectional flow area, $A_{c,{\framebox[1.5ex]{\raisebox{-2.2pt}[0pt][0ex]{\scriptsize 6}}}}$ [${\mbox{m}}^2$].
• Local loss coefficient, $K_{\framebox[1.5ex]{\raisebox{-2.2pt}[0pt][0ex]{\scriptsize 6}}}$ [--].
• Equivalent roughness of wetted surfaces, $\epsilon_{\framebox[1.5ex]{\raisebox{-2.2pt}[0pt][0ex]{\scriptsize 6}}}$ [m].

)

Core plate loss coefficient^10.2 , K₀ [--].

.

2nd segment: Fuel element geometry. We assume a geometry similar to Figure 10.4.

• The number of fuel rods in one fuel element (ie exclusive the water rod(s)) [--].
• The total number of rods in the element (ie inclusive the water rod(s)) [--].
• Outer radius of the fuel rods, $R_{\mbox{\protect\scriptsize cl,o}}$ [m].
• The pitch of the rod array, P [m].
• Inner dimension of the square shroud [m].
• Total length of the fuel bundle, $\ell_c$ [m].
• Equivalent roughness of wetted surfaces, $\epsilon_{\framebox[1.5ex]{\raisebox{-2.2pt}[0pt][0ex]{\scriptsize 1}}}$ [m].
• Number of spacers along the fuel element, $N_{\mbox{\protect\scriptsize sp}}$ [--].
• The locations (a total of $N_{\mbox{\protect\scriptsize sp}}$) of the spacers relative to the bottom of the fuel element in ascending order [m].
• The single phase loss coefficients of the $N_{\mbox{\protect\scriptsize sp}}$ spacers [--].

.

3rd segment: Other system specifications.

• System pressure, $P_{\mbox{\protect\scriptsize sys}}$ [Pa].
• Feedwater temperature, T_d [ ${}^\circ\mbox{C}$].
• Steam separator carry-over fraction, ${\mbox{CO}}$ [--].
• Steam separator carry-under fraction, ${\mbox{CU}}$ [--].

.

4th segment: Specifications of the core computational grid.

• Average steplength, $h_{\mbox{\protect\scriptsize av}}$ [m].
• Number of uniform steplengths for every spacer, N.

.

5th segment: Model parameters.

• Length of the spacer pressure pulse, $\Delta z_{\mbox{\protect\scriptsize sp}}$ [m].

.

6th segment: Miscellaneous.

• Number of grid reductions^10.3 [--].

An example of an input file is shown below.

//Hydraulics input file.
//-----------------------------------------------------------------------------
//1st SEGMENT: GEOMETRY OF THE REACTOR.
//-----------------------------------------------------------------------------
//The number of fuel elements [--].
784

//Elevational data.
//Exit of the downcomer [m].
0.0
//Inlet of the core - the bottom of the core plate [m].
1.0
//Outlet of the core [m].
3.44
//Steam separator inlet [m].
13.44 //8.44 //13.44
//Feedwater inlet [m].
13.44 //8.44 //13.44
//Water level [m].
14.44 //9.44 //14.44
//Separator exit [m].
15.44 //10.44 //15.44

//Riser specifications.
//Equivalent diameter of riser pipe [m].
4.5
//Flow cross-sectional area [m^2].
63.62
//Equivalent roughness of riser surfaces (drawn tubing: 1.524e-6m) [m].
1.524e-6

//Steam separator specifications.
//Equivalent diameter [m].
0.154
//Flow cross-sectional area [m^2].
4.078 //2.815
//Local loss coefficient [---].
2.00 //3.12
//Equivalent roughness of steam separator surfaces (drawn tubing: 1.524e-6m)
// [m].
1.524e-6

//Downcomer above feedwater sparger specifications.
//Equivalent diameter [m].
1.00
//Flow cross-sectional area [m^2].
18.00
//Local loss coefficient [---].
0.00
//Equivalent roughness of wetted surfaces (drawn tubing: 1.524e-6m)
// [m].
1.524e-6

//Downcomer specifications.
//Equivalent diameter [m].
1.00
//Flow cross-sectional area [m^2].
18.00
//Local loss coefficient [---].
0.0 //261.3
//Equivalent roughness of wetted surfaces (drawn tubing: 1.524e-6m)
// [m].
1.524e-6

//Specifications of lower plenum.
//Equivalent diameter [m].
1.28
//Flow cross-sectional area [m^2].
11.00
//Local loss coefficient [---].
0.00
//Equivalent roughness of wetted surfaces (drawn tubing: 1.524e-6m)
// [m].
1.524e-6

//Core plate loss coefficient [---].
7.00

//-----------------------------------------------------------------------------
//2nd SEGMENT: FUEL ELEMENT GEOMETRY.
//-----------------------------------------------------------------------------
//The number of fuel rods in the fuel bundle, exclusive water rod(s) [--].
63
//The total number of rods in the fuel bundle, inclusive water rod(s).
64
//The outer radius of the fuel rods in [m].
0.6261e-2
//The pitch of the array of rods [m].
1.626e-2
//The inner dimension of the SQUARE shroud surrounding the fuel rods [m].
0.13404
//The total length (active or non-active) of the fuel bundle [m].
2.44
//The equivalent roughness of the wet surfaces of the fuel bundle (drawn tubing:
//1.524e-6m) [m].
1.524e-6
//The number of spacers along the fuel bundle [--].
5 //7
//The z-coordinates for the placement of the spacers (in ascending
// order!) [m].
0.4     0.9     1.4     1.9     2.2
//0.3     0.6     0.9     1.2     1.5     1.8     2.3
//The single phase loss coefficients of the spacers [--].
//0.0     0.0     0.0     0.0     0.0
0.54    0.54    0.54    0.54    0.54   //0.54    0.54

//-----------------------------------------------------------------------------
//3rd SEGMENT: OTHER SPECIFICATIONS.
//-----------------------------------------------------------------------------
//System pressure which corresponds to the pressure at the liquid surface above
// the feedwater inlet [Pa].
7.1e6
//Temperature of feedwater [deg.C].
215
//Steam separator carry over (true fraction) [---].
0.001
//Steam separator carry under (true fraction) [---].
0.002

//-----------------------------------------------------------------------------
//4th SEGMENT: REACTOR CORE COMPUTATIONAL GRID SPECIFICATIONS.
//-----------------------------------------------------------------------------
//The average steplength in the grid [m].
0.1
//The number of uniform steplengths which succeed a spacer.
5

//-----------------------------------------------------------------------------
//5th SEGMENT: MODEL PARAMETERS.
//-----------------------------------------------------------------------------
//The length of the spacer pressure pulse [m].
0.05

//-----------------------------------------------------------------------------
//6th SEGMENT: MISCELLANEOUS.
//-----------------------------------------------------------------------------
//Number of grid reductions (13.06.95)
0

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