Ducted Assembly Steady-State Heat Transfer Software (DASSH)

Abstract

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Implementation of an Orificing Optimization Algorithm in the DASSH Subchannel Analysis Code

“…The orificing optimization has necessitated new input and output features from DASSH compared to those initially outlined in the User Guide [2]. This section describes the new inputs and summarizes the output.…”

“…Because the orificing optimization constitutes multiple DASSH calculations, the results associated with each are available to the user. These results produced by DASSH for each calculation are discussed in detail in the User Guide [2]. A CSV file containing summary output is produced when the algorithm terminates that combines the results from multiple timesteps, summarized in Table 2.…”

“…The Ducted Assembly Steady-State Heat transfer code (DASSH) performs full-core subchannel thermal hydraulics calculations in liquid metal fast reactors [1,2,3,4]. DASSH is based on the energy balance methodology implemented in the SUPERENERGY-2 software [5].…”

Summary of DASSH-CFD Inter-Assembly Heat Transfer Comparison

“…In addition to the system characteristics described in the previous subsection, DASSH requires the specification of additional parameters and options necessary to carry out the simulation. Details about DASSH, the methodology it is built on, and its usage can be found in the supporting documentation [6,7]. This subsection presents DASSH model options utilized in this analysis and describes why this problem poses difficulty for DASSH.…”

Status of PyGriffin Development for Integration into the NEAMS Workbench

“…The "extended ARC suite of codes", which is used to refer to the combination of the established ARC codes and newer reactor modeling codes, gathers neutronics, thermal hydraulics, safety, and fuel behavior analysis codes including MC 2 -3 [10] for multi-group cross-section processing, DIF3D [11] for flux calculation, REBUS-3 [12] for depletion and equilibrium calculations, PERSENT [13] for perturbation theory calculations (perturbation, sensitivity and uncertainty quantification), GAMSOR [14] for gamma heating calculations, PROTEUS-Nodal [15] transport solver, ORIGEN-S [16] for detailed depletion calculations, DASSH [17] for subchannel calculations, OpenMC [18] for Monte Carlo neutronics, and Griffin [9] for high fidelity deterministic neutronics. The integration of all codes in the NEAMS Workbench through PyARC and PyGriffin is shown in Figure 1.1.…”