Abstract We develop a new high-fidelity multiphysics model to simulate boron chemistry in the porous Chalk River Unidentified Deposit (CRUD) deposits. Heat transfer, capillary flow, solute transport, and chemical reactions are fully coupled. The evaporation of coolant in the deposits is included in governing equations modified by the volume-averaged assumption of wick boiling. The axial offset anomaly (AOA) of the Seabrook nuclear power plant is simulated. The new model reasonably predicts the distributions of temperature, pressure, velocity, volumetric boiling heat density, and chemical concentrations. In the thicker CRUD regions, 60% of total heat is removed by evaporative heat transfer, causing the accumulation of boron species. The new model successfully shows the quantitative effect of coolant evaporation on the local distributions of boron. The total amount of boron in the CRUD layer increases by a factor of 1.21 when evaporation-driven increase of soluble and precipitated boron concentrations is reflected. In addition, the concentrations of B(OH)3 and LiBO2 are estimated according to various conditions such as different CRUD thickness and porosity. At the end of cycle of the AOA case, the total mass of boron incorporated in CRUD deposits of a reference single fuel rod is estimated to be about 0.5 mg.

中文翻译：

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BOTANI：CRUD 矿床中硼化学的高保真多物理场模型

摘要 我们开发了一种新的高保真多物理场模型来模拟多孔乔克河不明矿床 (CRUD) 矿床中的硼化学。传热、毛细管流动、溶质传输和化学反应完全耦合。沉积物中冷却剂的蒸发包含在由灯芯沸腾的体积平均假设修改的控制方程中。模拟了 Seabrook 核电站的轴向偏移距异常（AOA）。新模型合理地预测了温度、压力、速度、体积沸腾热密度和化学浓度的分布。在较厚的 CRUD 区域，60% 的总热量通过​​蒸发传热去除，导致硼物种的积累。新模型成功地显示了冷却剂蒸发对硼局部分布的定量影响。当蒸发驱动的可溶性和沉淀硼浓度增加时，CRUD 层中硼的总量增加了 1.21 倍。此外，B(OH)3 和 LiBO2 的浓度是根据不同的条件，如不同的 CRUD 厚度和孔隙率来估算的。在 AOA 情况的循环结束时，在参考单燃料棒的 CRUD 沉积物中掺入的硼总质量估计约为 0.5 毫克。