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3. I/O FILES
We shall describe the structure of I/O files and their physical contents that will be helpful to
prepare the input and to utilize the output.
The I/O files used in SRAC are divided into PDS files (described in Sect.1.4) and sequential
data set files (PS files). Their contents will be described in this chapter.
3.1 Contents of PDS files
document.
Ten PDS files below are used. The strings appearing in [ ] are the file name used in this
- Public Fast Library [PFAST]
- Public Thermal Library [PTHERMAL]
- Public MCROSS Library [PMCROSS]
- User Fast Library [UFAST]
- User Thermal Library [UTHERMAL]
- User MCROSS Library [UMCROSS]
- Fine Group Effective Microscopic Cross Section File[MICREF]
- Fine Group Macroscopic Cross Section File [MACROWRK]
- Coarse (Few) Group Macroscopic Cross Section File [MACRO]
- Flux File [FLUX]
The contents of each file will be described separately. Several pairs of files appear in the above
list: Public Fast and User Fast files, Public Thermal and User Thermal files, and Public MCROSS and
User MCROSS files. The structure of User file and Public one is common except MCROSS file:
Public MCROSS file contains point-wise cross-sections and User MCROSS file contains Doppler
broadened hyperfine group cross-sections. While the Public files contains the data of every possible
nuclides, the User one keeps the data of the nuclides specified by the user for a series of calculations.
The data in User Fast and Thermal files are collapsed into the user’s collapsed energy group structure
by using the neutron spectrum installed in the Public ones. The Public files are accessed as read-only
files.
Although all the members of PDS files keep the member length at the top of each member (cf.
Sect.1.4), the description hereafter does not specify it.
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