7. Assembly Parameters

This document lists all of the Assembly Parameters that are provided by the ARMI Framework. See armi.reactor.parameters for use.

Assembly Parameters from Framework

Name	Description	Units
powerDecay	List of decay heats at each time step specified in decayHeatCalcTimesInSeconds setting.	W
orientation	Triple representing rotations counterclockwise around each spatial axis. For example, a hex assembly rotated by 1/6th has orientation (0,0,60.0)	degrees
arealPd	Power in assembly divided by its XY cross-sectional area. Related to PCT.	MW/m^2
buLimit	buLimit
chargeBu	Max block-average burnup in this assembly when it most recently entered the core. If the assembly was discharged and then re-charged, this value will only reflect the most recent charge.	%FIMA
chargeCycle	Cycle number that this assembly most recently entered the core. If the assembly was discharged and then re-charged, this value will only reflect the most recent charge.
chargeFis	Fissile mass in assembly when it most recently entered the core. If the assembly was discharged and then re-charged, this value will only reflect the most recent charge.	kg
chargeTime	Time at which this assembly most recently entered the core. If the assembly was discharged and then re-charged, this value will only reflect the most recent charge.	yr
multiplicity	The number of physical assemblies that the associated object represents. This is typically 1, but may need to change when the assembly is moved between containers with different types of symmetry. For instance, if an assembly moves from a Core with 1/3rd symmetry into a spent-fuel pool with full symmetry, rather than splitting the assembly into 3, the multiplicity can be set to 3. For now, this is a bit of a hack to make fuel handling work; multiplicity in the 1/3 core should be 3 to begin with, in which case this parameter could be used as the primary means of handling symmetry and fractional domains throughout ARMI. We will probably roll that out once the dust settles on some of this SFP work. For now, the Core stores multiplicity as 1 always, since the powerMultiplier to adjust to full-core quantities.
daysSinceLastMove	daysSinceLastMove
kInf	kInf
maxDpaPeak	maxDpaPeak	dpa
maxPercentBu	maxPercentBu	%
numMoves	numMoves
timeToLimit	timeToLimit	days
detailedNDens	High-fidelity number density vector with up to thousands of nuclides. Used in high-fi depletion runs where low-fi depletion may also be occurring. This param keeps the hi-fi and low-fi depletion values from interfering. See core.p.detailedNucKeys for keys.	atoms/(bn*cm)
notes	A string with notes about the assembly, limited to 1000 characters. This parameter is not meant to store data. Needlessly storing large strings on this parameter for every assembly is potentially unwise from a memory perspective.
crCriticalFraction	The insertion fraction when the control rod assembly is in its critical configuration. Note that the default of -1.0 is a trigger for this value not being set yet.
crCurrentElevation	The current elevation of the bottom of the moveable section of a control rod assembly.	cm
crInsertedElevation	The elevation of the furthest-most insertion point of a control rod assembly. For a control rod assembly inserted from the top, this will be the lower tip of the bottom-most moveable section in the assembly when fully inserted.	cm
crRodLength	length of the control material within the control rod	cm
crWithdrawnElevation	The elevation of the tip of a control rod assembly when it is fully withdrawn. For a control rod assembly inserted from the top, this will be the lower tip of the bottom-most moveable section in the assembly when fully withdrawn.	cm
THdeltaPNoGrav	Total pressure difference minus gravity; it can be thought of as being ‘total pressure loss’	Pa
THdeltaPPump	Pumping pressure rise required to pump the given mass flow rate through the rod bundle	Pa
THdeltaPTotal	Total pressure difference across the assembly	Pa
THcoolantOutletT	The nominal average bulk coolant outlet temperature out of the block.	°C
THmassFlowRate	The nominal assembly flow rate	kg/s
THlocalDTout	Maximum delta-Ts for outlet temperatures of all assemblies	°C
THlocalDToutFuel	Maximum delta-Ts for outlet temperatures of fuel assemblies	°C
THorificeZone	orifice zone for assembly; should be location specific
type	The name of the assembly input on the blueprints input
nozzleType	nozzle type for assembly
THcoolantInletT	Assembly inlet temperature in C (cold temperature)	°C
assemNum	Assembly number
dischargeTime	Time the Assembly was removed from the Reactor.	yr
hotChannelFactors	Definition of set of HCFs to be applied to assembly.
AziMesh	Number of points in the Azimuthal mesh.
RadMesh	Number of points in the Radial mesh.