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Boron and lithium aqueous thermochemistry to model crud deposition in pressurized water reactors

Journal Article · · Journal of Chemical Thermodynamics
 [1];  [2];  [3]
  1. Univ. of Tennessee, Knoxville, TN (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
  2. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  3. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Here, a comprehensive database of boron and lithium aqueous thermochemistry has been developed for use at elevated temperatures. The Helgeson-Kirkham-Flowers (HKF) formalism provides a framework to describe thermodynamic properties over a broad range of temperatures and pressures. Accuracy at high temperatures is vital to modeling nickel oxide and ferrite fuel deposits that occur in pressurized water nuclear reactors (PWRs). CALPHAD (CALculation of PHAse Diagrams) calculations are performed at PWR crud conditions to predict the stability regions of the solid lithium metaborate (LiBO2) and lithium tetraborate (Li2B4O7) precipitates. In addition, similar calculations are performed using sodium and potassium instead of lithium in order to assess the thermodynamics associated with preventing the formation of such precipitates. This database contributes to understanding of crud formation and composition and will aid in the prediction of phenomena such as Crud-Induced Power Shifts (CIPS).
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Nuclear Energy (NE); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
2332799
Report Number(s):
LA-UR--24-22086
Journal Information:
Journal of Chemical Thermodynamics, Journal Name: Journal of Chemical Thermodynamics Vol. 195; ISSN 0021-9614
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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