armi.nucDirectory.nuclideBases module
This module provides fundamental nuclide information to be used throughout the framework and applications.
The nuclide class structure is outlined here.
Class inheritance diagram for
INuclide
.
Examples
>>> nuclideBases.byName['U235']
<NuclideBase U235: Z:92, A:235, S:0, W:2.350439e+02, Label:U235>, HL:2.22160758861e+16, Abund:7.204000e-03>
>>> nuclideBases.byLabel['U235']
<NuclideBase U235: Z:92, A:235, S:0, W:2.350439e+02, Label:U235>, HL:2.22160758861e+16, Abund:7.204000e-03>
Retrieve U-235 by the MC2-2 ID:
>>> nuclideBases.byMcc2Id['U-2355']
<NuclideBase U235: Z:92, A:235, S:0, W:2.350439e+02, Label:U235>, HL:2.22160758861e+16, Abund:7.204000e-03>
Retrieve U-235 by the MC2-3 ID:
>>> nuclideBases.byMcc3Id['U235_7']
<NuclideBase U235: Z:92, A:235, S:0, W:2.350439e+02, Label:U235>, HL:2.22160758861e+16, Abund:7.204000e-03>
Retrieve U-235 by the MCNP ID:
>>> nuclideBases.byMcnpId['92235']
<NuclideBase U235: Z:92, A:235, S:0, W:2.350439e+02, Label:U235>, HL:2.22160758861e+16, Abund:7.204000e-03>
Retrieve U-235 by the AAAZZZS ID:
>>> nuclideBases.byAAAZZZSId['2350920']
<NuclideBase U235: Z:92, A:235, S:0, W:2.350439e+02, Label:U235>, HL:2.22160758861e+16, Abund:7.204000e-03>
name |
type |
a |
z |
state |
abundance |
weight |
halflife |
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- class armi.nucDirectory.nuclideBases.NuclideInterface[source]
Bases:
object
An abstract nuclide implementation which defining various methods required for a nuclide object.
- getDecay(decayType)[source]
Return a
DecayMode
object.- Parameters:
decType (str) – Name of decay mode, e.g. ‘sf’, ‘alpha’
- Returns:
decay
- Return type:
- getMcc2Id()[source]
Return the MC2-2 nuclide identification label based on the ENDF/B-V.2 cross section library.
- class armi.nucDirectory.nuclideBases.NuclideWrapper(container, key)[source]
Bases:
NuclideInterface
A nuclide wrapper class, used as a base class for nuclear data file nuclides.
- property name
Return the underlying nuclide’s name (i.e. “PU239”).
Notes
The nuclide name consists of the capitalized 2 character element symbol and atomic mass number.
- property weight
Get the underlying nuclide’s weight.
- class armi.nucDirectory.nuclideBases.INuclide(element, a, state, weight, abundance, halflife, name, label, mcc2id=None, mcc3id=None)[source]
Bases:
NuclideInterface
Nuclide interface, the base of all nuclide objects.
- Variables:
z (int) – Number of protons.
a (int) – Number of nucleons.
state (int) – Indicates excitement, 1 is more excited than 0.
abundance (float) – Isotopic fraction of a naturally occurring nuclide. The sum of all nuclide abundances for a naturally occurring element should be 1.0. This is atom fraction, not mass fraction.
name (str) – ARMI’s unique name for the given nuclide.
label (str) – ARMI’s unique 4 character label for the nuclide. These are not human readable, but do not lose any information. The label is effectively the
Element.symbol `armi.nucDirectory.elements.Element.symbol
padded to two characters, plus the mass number (A) in base-26 (0-9, A-Z). Additional support for meta-states is provided by adding 100 * the state to the mass number (A).nuSF (float) – Neutrons released per spontaneous fission. This should probably be moved at some point.
Create an instance of an INuclide.
Warning
Do not call this constructor directly; use the factory instead.
- fissile = ['U235', 'PU239', 'PU241', 'AM242M', 'CM244', 'U233']
- TRANSMUTATION = 'transmutation'
- DECAY = 'decay'
- SPONTANEOUS_FISSION = 'nuSF'
- getDecay(decayType)[source]
Get a
DecayMode
.Retrieve the first
DecayMode
matching the specified decType.- Parameters:
decType (str) – Name of decay mode e.g. ‘sf’, ‘alpha’
- Returns:
decay
- Return type:
- class armi.nucDirectory.nuclideBases.IMcnpNuclide[source]
Bases:
object
Abstract class for retrieving nuclide identifiers for the MCNP software.
- class armi.nucDirectory.nuclideBases.NuclideBase(element, a, weight, abundance, state, halflife)[source]
Bases:
INuclide
,IMcnpNuclide
Represents an individual nuclide/isotope.
- getNaturalIsotopics()[source]
Gets the natural isotopics root
Element
.Gets the naturally occurring nuclides for this nuclide.
See also
- getMcc2Id()[source]
Return the MC2-2 nuclide identification label based on the ENDF/B-V.2 cross section library.
- getMcc3Id()[source]
Return the MC2-3 nuclide identification label based on the ENDF/B-VII.0 cross section library.
- getMcnpId()[source]
Gets the MCNP label for this nuclide.
- Returns:
id – The MCNP ID e.g.
92235
,94239
,6000
- Return type:
- getAAAZZZSId()[source]
Return a string that is ordered by the mass number, A, the atomic number, Z, and the isomeric state, S.
Notes
An example would be for U235, where A=235, Z=92, and S=0, returning
2350920
.
- getSerpentId()[source]
Returns the SERPENT style ID for this nuclide.
- Returns:
id – The ID of this nuclide based on it’s elemental name, weight, and state, eg
U-235
,Te-129m
,- Return type:
- getEndfMatNum()[source]
Gets the ENDF MAT number.
MAT numbers are defined as described in section 0.4.1 of the NJOY manual. Basically, it’s Z * 100 + I where I is an isotope number. I=25 is defined as the lightest known stable isotope of element Z, so for Uranium, Z=92 and I=25 refers to U234. The values of I go up by 3 for each mass number, so U235 is 9228. This leaves room for three isomeric states of each nuclide.
- Returns:
id – The MAT number e.g.
9237
for U238- Return type:
- class armi.nucDirectory.nuclideBases.NaturalNuclideBase(name, element)[source]
Bases:
INuclide
,IMcnpNuclide
Represents an individual nuclide/isotope that is naturally occurring.
Notes
This is meant to represent the combination of all naturally occurring nuclides within an element. The abundance is forced to zero here so that it does not have any interactions with the NuclideBase objects.
- getNaturalIsotopics()[source]
Gets the natural isotopics root
Element
.Gets the naturally occurring nuclides for this nuclide.
See also
- getMcnpId()[source]
Gets the MCNP ID for this element.
- Returns:
id – The MCNP ID e.g.
1000
,92000
. Not zero-padded on the left.- Return type:
- getAAAZZZSId()[source]
Gets the AAAZZZS ID for a few elements.
Notes
the natural nuclides ‘C’ and ‘V’ do not have isotopic nuclide data for MC2 so sometimes they tag along in the list of active nuclides. This method is designed to fail in the same as if there was not getAAAZZZSId method defined.
- getMcc2Id()[source]
Return the MC2-2 nuclide identification label based on the ENDF/B-V.2 cross section library.
- getMcc3Id()[source]
Return the MC2-3 nuclide identification label based on the ENDF/B-VII.0 cross section library.
- class armi.nucDirectory.nuclideBases.DummyNuclideBase(name, weight)[source]
Bases:
INuclide
Represents a dummy/placeholder nuclide within the system.
Notes
This may be used to store mass from a depletion calculation, specifically in the instances where the burn chain is truncated.
- getNaturalIsotopics()[source]
Gets the natural isotopics, an empty iterator.
Gets the naturally occurring nuclides for this nuclide.
- Returns:
empty – An empty generator
- Return type:
iterator
See also
- class armi.nucDirectory.nuclideBases.LumpNuclideBase(name, weight)[source]
Bases:
INuclide
Represents a combination of many nuclides from NuclideBases into a single lumped nuclide.
See also
armi.physics.neutronics.fissionProduct
Describes what nuclides LumpNuclideBase is expend to.
- getNaturalIsotopics()[source]
Gets the natural isotopics, an empty iterator.
Gets the naturally occurring nuclides for this nuclide.
- Returns:
empty – An empty generator
- Return type:
iterator
See also
- armi.nucDirectory.nuclideBases.initReachableActiveNuclidesThroughBurnChain(numberDensityDict, activeNuclides)[source]
March through the depletion chain and find all nuclides that can be reached by depleting nuclides passed in.
This limits depletion to the smallest set of nuclides that matters.
- Parameters:
numberDensityDict (dict) – Starting number densities.
activeNuclides (OrderedSet) – Active nuclides defined on the reactor blueprints object. See: armi.reactor.blueprints.py
- armi.nucDirectory.nuclideBases.getIsotopics(nucName)[source]
Expand elemental nuc name to isotopic nuc bases.
- armi.nucDirectory.nuclideBases.isMonoIsotopicElement(name)[source]
Return true if this is the only naturally occurring isotope of its element.
- armi.nucDirectory.nuclideBases.where(predicate)[source]
Return all
INuclides
objects matching a condition.Returns an iterator of
INuclides
matching the specified condition.- Variables:
predicate (lambda) – A lambda, or function, accepting a
INuclide
as a parameter
Examples
>>> from armi.nucDirectory import nuclideBases >>> [nn.name for nn in nuclideBases.where(lambda nb: 'Z' in nb.name)] ['ZN64', 'ZN66', 'ZN67', 'ZN68', 'ZN70', 'ZR90', 'ZR91', 'ZR92', 'ZR94', 'ZR96', 'ZR93', 'ZR95', 'ZR']
>>> # in order to get length, convert to list >>> isomers90 = list(nuclideBases.where(lambda nb: nb.a == 95)) >>> len(isomers90) 3 >>> for iso in isomers: print(iso) <NuclideBase MO95: Z:42, A:95, S:0, label:MO2N> <NuclideBase NB95: Z:41, A:95, S:0, label:NB2N> <NuclideBase ZR95: Z:40, A:95, S:0, label:ZR2N>
- armi.nucDirectory.nuclideBases.single(predicate)[source]
Return a single
INuclide
object meeting the specified condition.Similar to
where()
, this function uses a lambda input to filter theINuclide instances
. If there is not 1 and only 1 match for the specified condition, an exception is raised.Examples
>>> from armi.nucDirectory import nuclideBases >>> nuclideBases.single(lambda nb: nb.name == 'C') <NaturalNuclideBase C: Z:6, w:12.0107358968, label:C>
>>> nuclideBases.single(lambda nb: nb.z == 95 and nb.a == 242 and nb.state == 1) <NuclideBase AM242M: Z:95, A:242, S:1, label:AM4C>
- armi.nucDirectory.nuclideBases.changeLabel(nuclideBase, newLabel)[source]
Updates a nuclide label and modifies the
byLabel
look-up dictionary.Notes
Since nuclide objects are defined and stored globally, any change to the attributes will be maintained.
- armi.nucDirectory.nuclideBases.getDepletableNuclides(activeNuclides, obj)[source]
Get nuclides in this object that are in the burn chain.
- armi.nucDirectory.nuclideBases.imposeBurnChain(burnChainStream)[source]
Apply transmutation and decay information to each nuclide.
Notes
You cannot impose a burn chain twice. Doing so would require that you clean out the transmutations and decays from all the module-level nuclide bases, which generally requires that you rebuild them. But rebuilding those is not an option because some of them get set as class-level attributes and would be orphaned. If a need to change burn chains mid-run re-arises, then a better nuclideBase-level burnchain cleanup should be implemented so the objects don’t have to change identity.
Notes
We believe the transmutation information would probably be better stored on a less fundamental place (e.g. not on the NuclideBase).
See also
armi.nucDirectory.transmutations
describes file format
- armi.nucDirectory.nuclideBases.factory()[source]
Reads data files to instantiate the
INuclides
.Reads NIST, MC**2 and burn chain data files to instantiate the
INuclides
. Also clears and fills in theinstances
,byName
,byLabel
, andbyMcc3Id
module attributes. This method is automatically run upon loading the module, hence it is not usually necessary to re-run it unless there is a change to the data files, which should not happen during run time, or a bad :py:class`INuclide` is created.Notes
This may cannot be run more than once. NuclideBase instances are used throughout the ARMI ecosystem and are even class attributes in some cases. Re-instantiating them would orphan any existing ones and break everything.
- armi.nucDirectory.nuclideBases.addGlobalNuclide(nuclide: NuclideBase)[source]
Add an element to the global dictionaries.