3.12. Card 9: Calculation region details for tet mesh geometries

Table 3.12.1 IMAT PHITS: same name

Value	Description
	The number of distinct materials present in the problem.

Table 3.12.2 MTSCORE PHITS: same name

Value	Description
(DP=0)	Select which materials will have activation assessed in them.
= 0	Evaluate activation and decay in all materials.
= N	Only evaluate activation and decay in the N\(^{th}\) material.

Card 9a: Material information listings

This card must be repeated IMAT times; each entry is on a separate line.

Table 3.12.3 MT-LIST PHITS: not settable

Value	Description
	Number of nuclides present in this material.

See Card 9b from the region-wise entry. The nuclide composition of each material is specified by a Card 9b entry starting on the line immediately following each MT-LIST entry and should be MT-LIST lines long. \(\qquad\) (Note that MT-LIST behaves like ITGNCLS for region-wise geometries.)

Card 9c: Mesh information listings

Table 3.12.4 IMESH PHITS: not settable

Value	Description
	Total number of mesh regions (number of tetrahedrons).

Following the IMESH entry line should be a single line containing the column header names listed below followed by IMESH lines with values in each column for each mesh region. Below are listed the column headers with descriptions for what information should be provided in the respective columns in each line for each mesh region.

Table 3.12.5 NON PHITS: not settable

Value	Description
	Index of tetrahedron region relative to all tetrahedron regions.

Table 3.12.6 TETRA PHITS: not settable

Value	Description
	Tetrahedron number from *.ele elements file.

Table 3.12.7 MT PHITS: not settable

Value	Description
	Index of material (as ordered when listed in Card 9a) of the tetrahedron. (For instance, a MT of 2 refers to the second material listed in Card 9a.)

Table 3.12.8 FLUXS PHITS: not settable

Value	Description
(D=0.0, DP= automatically calculated [1], requires JMODE=1,2)	Total neutron flux below 20 MeV in [n/(cm\(^2\)\(\cdot\)sec)].

Table 3.12.9 XCM PHITS: not settable

Value	Description
(D=0.0, DP= automatic)	x-coordinate of tetrahedron center of mass [cm].

Table 3.12.10 YCM PHITS: not settable

Value	Description
(D=0.0, DP= automatic)	y-coordinate of tetrahedron center of mass [cm].

Table 3.12.11 ZCM PHITS: not settable

Value	Description
(D=0.0, DP= automatic)	z-coordinate of tetrahedron center of mass [cm].

Table 3.12.12 VOLUME PHITS: not settable

Value	Description
(D=1.0, DP=automatic)	Total volume of this mesh region in [cm\(^3\)].

Card 9d: Special output options for tetrahedral meshes

Table 3.12.13 FOAMOUT PHITS: same name

Value	Description
(D=0)	Select which additional special tet mesh files will be produced for each output time step ITOUT.
= 0	Do not output any additional files.
= 1	Output OpenFOAM-formatted files (foamout1_t\(^*\).foam).
= 2	Output CSV-formatted files (foamout2_t\(^*\).csv).
= 3	Output both OpenFOAM and CSV-formatted files.

Table 3.12.14 FOAMVALS PHITS: same name

Value	Description
(D=0, requires FOAMOUT=1 or FOAMOUT=3)	Select what quantity from each tetrahedron will be written to the OpenFOAM-formatted files generated at each output time step ITOUT.
= 0,1	Total decay heat [W]
= 2	Gamma decay heat [W]
= 3	Beta decay heat [W]
= 4	Alpha decay heat [W]
= 5	Photon effective dose rate [\(\mu\)Sv\(\cdot\)m\(^2\)/h] (calculated using the photon fluence-to-dose coefficients specified by IDOSECF)
= 6	Activity [Bq]
= -N	Input any of the above values multiplied by -1 to have results normalized to volume (ex. [W/cm\(^3\)])

[1]

PHITS calculates FLUXS as amp (in source/sec, from [T-Dchain] input parameters) times the region’s total neutron flux (in n/(source\(\cdot\)cm\(^2\)) as determined by the automatically generated [T-Track] tally).