armi.nucDirectory.nuclideBases module¶
The nuclideBases module classes for providing base nuclide information, such as Z, A, state and energy release.
For details on how to setup the RIPL-3 data files to process extra nuclide data see: Installation
The nuclide class structure is outlined in the figure.
Class inheritance diagram for
INuclide
.
See also
armi.nucDirectory.nuclideBases._addNuclideToIndices
builds this object
Examples
>>> nuclideBases.byName['U235']
<NuclideBase U235: Z:92, A:235, S:0, label:U_6J, mc2id:U-2355>
>>> nuclideBases.byLabel['U_6J']
<NuclideBase U235: Z:92, A:235, S:0, label:U_6J, mc2id:U-2355>
Retrieve U-235 by the MC**2-v2 ID.
>>> nuclideBases.byMccId['U-2355']
<NuclideBase U235: Z:92, A:235, S:0, label:U_6J, mc2id:U-2355>
U235_7
Can get the same nuclide by the MC**2-v3 ID.
>>> nuclideBases.byMccId['U235_7']
<NuclideBase U235: Z:92, A:235, S:0, label:U_6J, mc2id:U-2355>
Retrieve U-235 by the MCNP ID.
>>> nuclideBases.byMcnpId['92235']
<NuclideBase U235: Z:92, A:235, S:0, label:U235, mc2id:U-2355>
U235_7
Retrieve U-235 by the AAAZZZS ID.
>>> nuclideBases.byAAAZZZSId['2350920']
<NuclideBase U235: Z:92, A:235, S:0, label:U235, mc2id:U-2355>
U235_7
name |
a |
z |
state |
weight |
label |
type |
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- armi.nucDirectory.nuclideBases.getIsotopics(nucName)[source]¶
Expand elemental nuc name to isotopic nuc bases.
- armi.nucDirectory.nuclideBases.nucNameFromDBName(dbName)[source]¶
Return the nuc name of the given param name if the param name has a corresponding nuc name.
If there is no nuc with that param name return None.
- 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]¶
Get all
INuclides
matching a condition.Returns an iterator of
INuclides
matching the specified condition.- Variables
~where.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, mc2id:MO95 5> <NuclideBase NB95: Z:41, A:95, S:0, label:NB2N, mc2id:NB95 5> <NuclideBase ZR95: Z:40, A:95, S:0, label:ZR2N, mc2id:ZR95 5>
- armi.nucDirectory.nuclideBases.single(predicate)[source]¶
Get a single
INuclide
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, mc2id:C 5>
>>> 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, mc2id:AM242M>
- 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
, andbyMccId
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.
Nuclide labels from MC2-2, MC2-3, and MCNP are currently handled directly. Moving forward, we plan to implement a more generic labeling system so that plugins can provide code-specific nuclide labels in a more extensible fashion.
- class armi.nucDirectory.nuclideBases.IMcnpNuclide[source]¶
Bases:
object
Interface which defines the contract for getMcnpId.
- class armi.nucDirectory.nuclideBases.NuclideInterface[source]¶
Bases:
object
An abstract nuclide implementation which defining various methods required for a nuclide object.
- 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.NuclideWrapper(container, key)[source]¶
Bases:
armi.nucDirectory.nuclideBases.NuclideInterface
A nuclide wrapper class, used as a base class for nuclear data file nuclides
- property name¶
Get 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(z, a, state, weight, abundance, name, label, mc2id)[source]¶
Bases:
armi.nucDirectory.nuclideBases.NuclideInterface
Nuclide interface, the base of all nuclide objects.
- Variables
~INuclide.z (int) – Number of protons.
~INuclide.a (int) – Number of nucleons.
~INuclide.state (int) – Indicates excitement, 1 is more excited than 0.
~INuclide.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.
~INuclide.name (str) – ARMI’s unique name for the given nuclide.
~INuclide.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).~INuclide.mc2id (str) – The unique id used by MC**2 version 2.
~INuclide.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
- getNaturalIsotopics()[source]¶
Gets the naturally occurring nuclides for this nuclide.
Abstract method, see concrete types for implementation.
- class armi.nucDirectory.nuclideBases.NuclideBase(element, a, weight, abundance, state, mc2id)[source]¶
Bases:
armi.nucDirectory.nuclideBases.INuclide
,armi.nucDirectory.nuclideBases.IMcnpNuclide
Represents an individual nuclide
This is meant to be a lookup class, with just one per unique nuclide in the problem. That means there won’t be copies of these in every block that has these nuclideBases.
Create an instance of an INuclide.
Warning
Do not call this constructor directly; use the factory instead.
- getNaturalIsotopics()[source]¶
Gets the natural isotopics root
Element
.Gets the naturally occurring nuclides for this nuclide.
See also
- getMcc3Id()[source]¶
Gets the MC**2-v3 nuclide ID.
- Returns
name – The MC**2 ID:
AM42M7
,B10__7
, etc.- Return type
See also
- getMcnpId()[source]¶
Gets the MCNP label for this nuclide
- Returns
id – The MCNP ID e.g.
92235
,94239
,6000
- Return type
- getAAAZZZSId()[source]¶
Gets the AAAZZZS label for this nuclide
- Returns
id – The MCNP ID e.g.
2350920
,2390940
,1200600
- Return type
- 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.DummyNuclideBase(name, mc2id, weight)[source]¶
Bases:
armi.nucDirectory.nuclideBases.INuclide
Dummy nuclides are used nuclides which transmute into isotopes that are not defined in blueprints.
Notes
If DMP number density is not very small, cross section may be artifically depressed.
Create an instance of an INuclide.
Warning
Do not call this constructor directly; use the factory instead.
- 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, z, mc2id, weight)[source]¶
Bases:
armi.nucDirectory.nuclideBases.INuclide
Lump nuclides are used for lumped fission products.
See also
armi.physics.neutronics.fissionProduct
Describes what nuclides LumpNuclideBase is expend to.
Create an instance of an INuclide.
Warning
Do not call this constructor directly; use the factory instead.
- 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.NaturalNuclideBase(name, element, mc2id)[source]¶
Bases:
armi.nucDirectory.nuclideBases.INuclide
,armi.nucDirectory.nuclideBases.IMcnpNuclide
Create an instance of an INuclide.
Warning
Do not call this constructor directly; use the factory instead.
- getNaturalIsotopics()[source]¶
Gets the natural isotopics root
Element
.Gets the naturally occurring nuclides for this nuclide.
See also
- getMcc3Id()[source]¶
Gets the MC**2-v3 nuclide ID.
- Returns
id – The MC**2 ID:
FE___7
,C____7
, etc.- Return type
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.
- 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