|About this Abstract
||MS&T22: Materials Science & Technology
||Thermodynamics of Materials in Extreme Environments
||High Temperature Boron, Lithium, Iron, and Nickel Aqueous Thermochemistry for Pressurized Water Nuclear Reactors
||Jason Rizk, Brian Wirth
|On-Site Speaker (Planned)
Chalk River Unidentified Deposits (CRUD) occur in the core of pressurized water nuclear reactors (PWRs) and cause several phenomena impacting the reactor’s efficiency, lifetime, and reliability. The primary of these phenomena is Axial Offset Anomaly (AOA) which is caused by nonuniform trapping of boron within the core. To aid in the modeling of these deposits, the high temperature aqueous thermochemistry of boron, lithium, nickel, and iron is described using the Helgeson-Kirkham-Flowers (HKF) formalism, which calculates the thermodynamic properties of individual aqueous species for temperatures up to 350 C. Non-ideality is treated using the Pitzer equations. The stability of compounds thought to constitute CRUD is mapped out for a range of possible conditions. The database contains new correlation parameters based on available experimental data and first-principles calculations. The thermodynamic system considered is vital for the power industry and has broader applications such as lithium production from natural brines containing boron.