MOSCATO Solver Development and Integration Plan

Abstract

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Validation of NEAMS Tools Using MSRE Data

“…Additionally, Samples 6-17, 7-10, and 14-63FV were not included in the comparison analysis below. The details of the power history leading up to the first sample (6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17) were difficult to ascertain from MSRP reports [10,11] and it was not possible to obtain a cumulative MWhr amount that was within 10% of the reported value. Finally, ADDER burn steps that would correspond to Samples 7-10 and 14-63FV (dated 7/6/66 and 2/27/68, respectively) were accidentally excluded during the run.…”

“…Third, no corrosion products are added to the salt in this fuel depletion simulation as this needs to be estimated separately from a dedicated corrosion modeling tool such as MOSCATO [15,16]. As an example, during two major periods of experimental runs of the MSRE, the average fuel salt composition was measured to have roughly around 72 ± 14 ppm Cr, 144 ± 44 ppm Fe, and 57 ± 40 ppm Ni [4].…”

“…These estimates are also over the course of around one to three effective full power years of the reactor, and therefore it is likely the fuel salt at 10 years could contain higher concentrations of corrosion products than this. Independent and custom corrosion assessments must be made for every reactor, salt, and alloy combination to understand how the fuel salt might become loaded with corrosion products over time, as well as how certain corrosion products may deposit back onto the structural components depending on thermal gradients throughout the loop [15].…”

Survey of Relevant Data from the MSRP to Guide Development of MSR Chemistry Modeling Benchmarks

“…Under the NEAMS Structural Materials & Chemistry technical area, development has been ongoing for MOSCATO [52,53], which simulates the behavior of electrochemically active solutes in both the salt and alloy at CFD-scale velocity and thermal gradients in the flowing salt. This is based on a Poisson-Nerst-Plank (PNP) model implemented into Nek5000, and soon NekRS as well.…”

“…Given the computational demands of CFD tools such as MOSCATO, modeling corrosion of very large geometries/systems and long timescales is not the ideal use-case. The code has been demonstrated for [52,53] and is being validated against experimental data from operated TCLs at relatively short timescales. This is useful in investigating the corrosion behavior of certain solutes, salt systems, and alloys, for unique or complex geometries and thermal flow fields.…”