armi.nucDirectory.nuclideBases module¶
The nuclideBases module classes for providing base nuclide information, such as Z, A, state and energy release.
The nuclide class structure is outlined in nuclide-bases-class-diagram.
Class inheritance diagram for
INuclide.
See also
armi.nucDirectory.nuclideBases._addNuclideToIndicesbuilds 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
Table of All nuclides:
type |
name |
a |
z |
state |
weight |
label |
mc2id |
getMcc3Id |
|---|---|---|---|---|---|---|---|---|
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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
INuclidesmatching a condition.Returns an iterator of
INuclidesmatching the specified condition.-
armi.nucDirectory.nuclideBases.predicate¶ A lambda, or function, accepting a
INuclideas a parameter- Type
lambda
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
INuclidemeeting 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.
See also
armi.nucDirectory.transmutations()describes file format
-
armi.nucDirectory.nuclideBases.factory(force=False)[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, andbyMccIdmodule 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.
-
class
armi.nucDirectory.nuclideBases.IMcnpNuclide[source]¶ Bases:
objectInterface which defines the contract for getMcnpId.
-
class
armi.nucDirectory.nuclideBases.NuclideInterface[source]¶ Bases:
objectAn abstract nuclide implementation which defining various methods required for a nuclide object.
-
getDecay(decayType)[source]¶ Get a
DecayMode.Retrieve the first
DecayModematching 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.NuclideInterfaceA 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.
-
property
-
class
armi.nucDirectory.nuclideBases.INuclide(z, a, state, weight, abundance, name, label, mc2id)[source]¶ Bases:
armi.nucDirectory.nuclideBases.NuclideInterfaceNuclide interface, the base of all nuclide objects.
-
z¶ Number of protons.
- Type
int
-
a¶ Number of nucleons.
- Type
int
-
state¶ Indicates excitement, 1 is more excited than 0.
- Type
int
-
abundance¶ 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.
- Type
float
-
name¶ ARMI’s unique name for the given nuclide.
- Type
str
-
label¶ 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.symbolpadded 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).- Type
str
-
mc2id¶ The unique id used by MC**2 version 2.
- Type
str
-
nuSF¶ Neutrons released per spontaneous fission. This should probably be moved at some point.
- Type
float
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
DecayModematching the specified decType.- Parameters
decType (str) – Name of decay mode e.g. ‘sf’, ‘alpha’
- Returns
decay
- Return type
-
isFissile()[source]¶ Determine if the nuclide is fissile.
Determines if the nuclide is fissle.
- Returns
answer – True if the
INuclideis fissile, otherwise False.- Return type
bool
-
getNaturalIsotopics()[source]¶ Gets the naturally occurring nuclides for this nuclide.
Abstract method, see concrete types for implementation.
- Returns
nuclides – List of
INuclides- Return type
list
-
-
class
armi.nucDirectory.nuclideBases.NuclideBase(element, a, weight, abundance, state, mc2id)[source]¶ Bases:
armi.nucDirectory.nuclideBases.INuclide,armi.nucDirectory.nuclideBases.IMcnpNuclideRepresents 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.
- Returns
nuclides – List of
INuclides- Return type
list
See also
-
getMcc3Id()[source]¶ Gets the MC**2-v3 nuclide ID.
- Returns
name – The MC**2 ID:
AM42M7,B10__7, etc.- Return type
str
See also
-
getMcnpId()[source]¶ Gets the MCNP label for this nuclide
- Returns
id – The MCNP ID e.g.
92235,94239,6000- Return type
str
-
getAAAZZZSId()[source]¶ Gets the AAAZZZS label for this nuclide
- Returns
id – The MCNP ID e.g.
2350920,2390940,1200600- Return type
str
-
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
str
-
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.
9237for U238- Return type
str
-
-
class
armi.nucDirectory.nuclideBases.DummyNuclideBase(name, mc2id, weight)[source]¶ Bases:
armi.nucDirectory.nuclideBases.INuclideCreate 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.INuclideCreate 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.IMcnpNuclideCreate 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.
- Returns
nuclides – List of
INuclides.- Return type
list
See also
-
getMcc3Id()[source]¶ Gets the MC**2-v3 nuclide ID.
- Returns
id – The MC**2 ID:
FE___7,C____7, etc.- Return type
str
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
str
-
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.getDefaultNuclideFlags()[source]¶ Return a default set of nuclides to model and deplete.
Notes
The nuclideFlags input on blueprints has confused new users and is infrequently changed. It will be moved to be a user setting, but in any case a reasonable default should be provided. We will by default model medium-lived and longer actinides between U234 and CM247.
We will include B10 and B11 without depletion, sodium, and structural elements.
We will include LFPs with depletion.
-
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
