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2.9 Material Specification
’Material’ appearing in this section may be understood as it has a set of macroscopic
cross-sections. Therefore, material name denoted by 8 characters expresses the name of material of
which cross-sections are already on fine-group macroscopic cross-section file (MACROWRK) or
few-group macroscopic cross-section file (MACRO) or will be formed. Several kinds of mixtures, as
follows, are included in material.
• A mixture with composition to which macroscopic cross-sections will be formed in this
case.
• A mixture of which macroscopic cross-sections were formed in the previous case and are
kept in MACROWRK file. The composition is not given in this case.
• A homogenized material with a CASENAME label to which macroscopic cross-sections
were formed in the previous case into MACROWRK and/or MACRO file. The former half
of member name is the case name of the previous case.
• A homogenized material with the CASENAME label of this case to which macroscopic
cross-sections are formed in this case, and will be used in the later step in this case or in the
next case. If this material will not be used in this case, the material name does not appear in
the material specification.
• A fictitious mixture with composition to be used only for reaction rate calculation.
• A fictitious mixture without composition of which macroscopic cross-sections were formed
in the previous case into MACROWRK and/or MACRO file to be used only for reaction
rate calculation.
Block-1 /1/
NMAT Number of materials to be specified hereafter.
Block-2 /A8, 2, 3/
1 MTNAME Material identification expressed by eight characters, composed of five tags as
‘mmmm-e-b-x-p’ or ‘case-e-b-x-p’ which appears as MEMBER name in
macroscopic cross-section files.
mmmm-tag
Material identification of 4 characters; the first character must be any alphabetic
character.
case-tag
To specify a set of X-Region averaged cross-sections formed in the previous case,
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