CCCC Formats – pyne.cccc

All functionality may be found in the cccc package:

from pyne import cccc

The information below represents the complete specification of the classes in the cccc module. For examples of usage, please refer to the User’s Guide entry for CCCC Formats.

CCCC API

The CCCC module contains a number of classes for reading various cross section, flux, geometry, and data files with specifications given by the Committee for Computer Code Coordination. The following types of files can be read using classes from this module: ISOTXS, DLAYXS, BRKOXS, RTFLUX, ATFLUX, RZFLUX, MATXS, and SPECTR.

The ISOTXS reader was originally derived from Professor James Holloway’s open-source C++ classes from the University of Michigan and later expanded by Nick Touran for work on his PhD thesis. DLAYXS was later added by Paul Romano. RTFLUX was done by Elliott Biondo.

A description of several CCCC formats are available online for ISOTXS, MATXS, RTFLUX, and RZFLUX. Other format specifications can be found in Los Alamos Report LA-5324-MS.

class pyne.cccc.Atflux(filename)

An Atflux object represents data stored in a ATFLUX file from the CCCC format specification. This file contains adjoint total fluxes. Note that this is the same format as RTFLUX. See Rtflux class for a complete list of atrributes. The RTFLUX/ATFLUX binary specification is found here:

http://t2.lanl.gov/nis/codes/transx-hyper/rtflux.html

Parameters:

filename : str

Path to the ATFLUX file to be read.

class pyne.cccc.Brkoxs(filename)

A Brkoxs object represents data stored in a BRKOXS file from the CCCC format specification. This file is given in conjunction with an ISOTXS (or GRUPXS) file when the Bondarenko self-shielding method is to be used.

Parameters:

filename : str

Path of the BRKOXS file to read.

class pyne.cccc.Dlayxs(filename)

A Dlayxs object represents the data stored in a CCCC-format DLAYXS file. This file contains delayed neutron precursor yields, emission spectra, and decay constants reduced to multigroup form. Typically, the data in a DLAYXS file would be related to cross-section files in ISOTXS and GRUPXS.

Attributes:

isotopes : list of strs

Names of the isotopes in the DLAYXS file.

isotopeFamily : dict

Dictionary whose keys are the isotope names and whose values are

decay : dict

Dictionary whose keys are names of nuclides and whose values are decay constants for each delayed neutron family.

spectrum : dict

nGroups : int

Number of energy groups

nIsotopes : int

Number of isotopes

nFamilies : int

Number of delayed neutron families

nu : dict

Parameters:

filename : str

Path of the DLAYXS file to load.

read()

Read through and parse data in the DLAYXS file.

class pyne.cccc.Isotxs(filename)

An Isotxs object represents a binary ISOTXS file written according to the CCCC specifications.

Attributes:

chi : list of floats

Fission yields by group.

emax : list of floats

Maximum energy bound for each group

emin : float

Minimum energy bound of set

fc : dict

Dictionary with file-control information

fileVersion : int

Version of the ISOTXS file.

label : str

File identification string

nuclides : list of _Nuclides

List of individual nuclides in the ISOTXS file.

vel : float

Mean neutron velocity in each group.

Parameters:

filename : str

Path of the ISOTXS file to load.

find_nuclide(name)

Returns a nuclide with a given name.

Parameters:

name : str

Path of the ISOTXS file to load.

Returns:

nuc : Nuclide

Object containing microscopic cross sections and other data.

read()

Read through and parse the ISOTXS file.

nuclides = None

List of nuclides in ISOTXS file.

class pyne.cccc.Matxs(filename)

A Matxs object represents data stored in a MATXS file. This file contains generalized cross-sections.

Parameters:

filename : str

Path to the MATXS file to be read.

class pyne.cccc.Rtflux(filename)

An Rtflux object represents data stored in a RTFLUX file from the CCCC format specification. This file contains regular (i.e. not adjoint) total fluxes. Attribute names mirror those described in the CCCC specification, found here:

http://t2.lanl.gov/nis/codes/transx-hyper/rtflux.html

Parameters:

filename : str

Path to the RTFLUX file to be read.

to_mesh(m, tag_name)

This member function tags supplied PyNE Mesh object with the fluxes contained in the rtflux file.

Parameters:

m: PyNE Mesh

A PyNE Mesh object with same x, y, z intervals used to generate the rtflux file.

tag_name: str

The tag name to use to tag the fluxes onto the mesh.

class pyne.cccc.Rzflux(filename)

A Rzflux object represents data stored in a RZFLUX file from the CCCC format specification. This file contains volumetric averages of fluxes by broad energy groups for different geometric zones.

Parameters:

filename : str

Path to the RZFLUX file to be read.

class pyne.cccc.Spectr(filename)

Reads ultra-fine group spectrum file from MC**2