Reactivity Feedback Modeling in SAM

Hu, Guojun; Zhang, G.; Hu, R.

doi:10.2172/1499041

Cited by 11 publications

(13 citation statements)

References 4 publications

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“…The reactivity feedback models in SAM are similar to the respective models used in SAS4A/SASSYS-1. The point-kinetics module and reactivity feedback models were summarized in an earlier report [14].…”

Section: Sam Enhancements In Reactivity Feedback and Decay Heat Modelingmentioning

confidence: 99%

FY20 SAM Code Developments and Validations for Transient Safety Analysis of Advanced non-LWRs

Hu¹,

Hu²,

Zou³

et al. 2020

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Section: Sam Enhancements In Reactivity Feedback and Decay Heat Modelingmentioning

confidence: 99%

FY20 SAM Code Developments and Validations for Transient Safety Analysis of Advanced non-LWRs

Hu¹,

Hu²,

Zou³

et al. 2020

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“…Systems Analysis Module (SAM) is a MOOSE-based modeling and simulation tool developed at Argonne National Laboratory for advanced reactor safety analysis [44], in particular sodiumcooled fast reactors (SFRs), lead-cooled fast reactors (LFRs), fluoride-salt-cooled high temperature reactors (FHRs), and molten salt reactors (MSRs). SAM calculates the reactivity feedback during transient simulations due to the following effects: fuel Doppler, coolant density changes, axial fuel expansion, and core radial expansion [44]. This section will focus on the axial and radial expansion capabilities.…”

Section: Systems Analysis Module (Sam)mentioning

confidence: 99%

“…The relative change in the core radius at different locations is calculated, (∆ ⁄ ) , and passed back to SAM for the reactivity calculation. The radial thermal expansion model in SAM was verified using the ABTR grid plate design model [44]. The model geometry and mesh are shown in Figure 22 with the hollow disk model on the left side and the grid plate geometry on the right side.…”

Section: ( ) = δmentioning

confidence: 99%

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Review of Tools for Modeling Core Radial Expansion in Liquid Metal-Cooled Fast Reactors

Wozniak¹,

Shemon²,

Grudziński³

2020

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Core radial expansion in liquid-metal cooled fast reactor systems is a well-known phenomenon that produces strong reactivity feedback effects. It is crucial from a safety standpoint to design a reactor with the proper core restraint system to guide expansion of the fuel assemblies into a formation that produces negative reactivity feedback in accident conditions. However, the modeling of core radial expansion and its associated reactivity feedback is extremely challenging. Liquid metal-cooled fast reactor designers (both industry and commercial) have pointed to improved modeling of core radial expansion as a key modeling challenge for these types of reactors. The Department of Energy Nuclear Energy Advanced Modeling and Simulation (DOE-NEAMS) program has an important role to play in helping to develop a robust, predictive tool for this phenomenon. A literature review has been performed to identify current simulation capabilities applicable to the prediction of core radial expansion in liquid metal-cooled fast reactors and the resultant reactivity feedback effects. An overview as well as a detailed description of the multi-physics phenomena underlying core radial expansion is given in the first two chapters. The objective of this report is to identify existing software that has been or could be applied to the core radial expansion problem, and then to identify possible paths to develop a robust, coupled multiphysics tool for advanced analysis, in which all three physics (radiation transport, structural mechanics, thermal fluids) are taken into account considering feedback effects from each physics to the other. Several computer codes and workflows have been developed in the United States and abroad to perform individual aspects of radial expansion calculations or to perform loosely coupled analysis. No code system currently exists which tightly and robustly couples the neutronics, thermal hydraulics, and thermal mechanical physics with enough detail to fully resolve the complex core radial expansion reactivity feedback effects. The future availability of such a code system is of vital importance to fully understanding the reactivity feedback effects that occur due to radial expansion, and consequently to optimizing the design of the core restraint system. A potential code development path forward using MOOSE-based tools is suggested in order to leverage the natural tight coupling and robustness of MOOSE-based applications. Additionally, potential gaps for modeling and common assumptions are listed which require further investigation to ensure accuracy for prediction of deformations.

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“…This Section first presents the brief theory of the point-kinetics module and reactivity feedback models. A number of verification tests have been performed where the code simulations are compared to the analytical model results, with details discussed in Hu et al (2019c).…”

Section: Point Kinetics and Reactivity Feedback Modelingmentioning

confidence: 99%