crp/OpenMC
1
0
Fork 0
mirror of https://github.com/openmc-dev/openmc.git synced 2026-07-27 05:35:49 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

Added documentation on <natural_elements>.

Browse source
This commit is contained in:
Paul Romano 2014-04-18 17:26:52 -04:00
parent c52ccd2cc2
commit 6b54d88885
1 changed files with 30 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

31
docs/source/usersguide/input.rst
View file

@ -182,6 +182,29 @@ performed. It has the following attributes/sub-elements:
*Default*: None
.. _natural_elements:
``<natural_elements>`` Element
------------------------------
The ``<natural_elements>`` element indicates to OpenMC what nuclides are
available in the cross section library when expanding an ``<element>`` into
separate isotopes (see :ref:`material`). The accepted values are:
- ENDF/B-VII.0
- ENDF/B-VII.1
- JEFF-3.1.1
- JEFF-3.1.2
- JEFF-3.2
- JENDL-3.2
- JENDL-3.3
- JENDL-4.0
Note that the value is case-insensitive, so "ENDF/B-VII.1" is equivalent to
"endf/b-vii.1".
*Default*: ENDF/B-VII.1
``<no_reduce>`` Element
-----------------------
@ -741,6 +764,8 @@ sub-elements:
Materials Specification -- materials.xml
----------------------------------------
.. _material:
``<material>`` Element
----------------------
@ -781,7 +806,7 @@ Each ``material`` element can have the following attributes or sub-elements:
Specifies that a natural element is present in the material. The natural
element is split up into individual isotopes based on IUPAC Isotopic
Compositions of the Elements 1997. This element has attributes/sub-elements
Compositions of the Elements 2009. This element has attributes/sub-elements
called ``name``, ``xs``, and ``ao``. The ``name`` attribute is the atomic
symbol of the element while the ``xs`` attribute is the cross-section
identifier. Finally, the ``ao`` attribute specifies the atom percent of the
@ -794,6 +819,10 @@ Each ``material`` element can have the following attributes or sub-elements:
<element name="Mn" ao="2.7426e-05" />
<element name="Cu" ao="1.6993e-04" />
In some cross section libraries, certain naturally occurring isotopes do not
have cross sections. The :ref:`natural_elements` option determines how a
natural element is split into isotopes in these cases.
*Default*: None