Elliott, Alicia | Engineering Papers

DOE OSTI2019

Inference of Crud Model Parameters from Plant Data

Over the past several years, the Virtual Environment forReactor Analysis, VERA, has provided a novel capability forthe Consortium for Advanced Simulation of Light Water Re-actors (CASL) to modelcrud-induced power shift (CIPS) inreactors operated by the Tennessee Valley Authority (TVA).While this developed capability in VERA is unique, multiplekey parameters in the crud physics have remained unknown.The methodology employed here provides the capability toinfer these key model parameters from measured plant data.Once the model parameters have been determined, a forwardVERA computation is performed and results are comparedto measured flux map data to determine the ecacy of thecalibrated crud model.

Collins, Benjamin↗

DOE OSTI2017

MAMBA

MAMBA is a general-purpose, liquid-solid surface chemistry solver that simulates the thermo-chemical evolution of compositions on cylindrical metal surfaces. MAMBA models conduction and convection heat transfer through porous media in one (radial) or three (radial, azimuthal, and axial) dimensions, including boiling heat transfer through "chimneys" in a porous CRUD layer. Thermo-chemistry models in MAMBA account for the growth corrosion and CRUD layers on the surface of the metal and can incorporate precipitation of additional species within the porous CRUD. MAMBA also accounts for the erosion of the surface layer through turbulent kinetic energy of a flowing liquid and the dissolution of species into the liquid as temperature changes occur. MAMBA currently includes thermo-chemistry models that account for soluble and precipitate dissolution of species from heat exchanger tubes and stainless steel piping as well as the species associated with CRUD formation on the surface of nuclear fuel rods.

Collins, Benjamin S↗