کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1569673 1514267 2006 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A model of chemistry and thermal hydraulics in PWR fuel crud deposits
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی هسته ای و مهندسی
پیش نمایش صفحه اول مقاله
A model of chemistry and thermal hydraulics in PWR fuel crud deposits
چکیده انگلیسی

A model is described for simulating thermal hydraulic and chemical conditions within fuel crud deposits. Heat transfer takes place by wick boiling in which water flows through the porous deposit and evaporates into steam at the surface of chimneys. The transport and chemistry of dissolved species within the deposit is also modelled. This chemistry includes the equilibrium chemistry of Li/boric acid species, the equilibrium chemistry of Fe/Ni species and the radiolysis chemistry of water. The unique feature of this model is that the chemistry is coupled to the thermal hydraulics via the increase in the saturation temperature with the concentration of dissolved species. This has a profound effect on evaporative heat transfer within thick deposits, leading to conditions that explain the precipitation of LiBO2 and the possible formation of bonaccordite. The model helps understand several crud scrape observations, including why AOA is observed to occur for a crud thickness in the region of 20–30 μm.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Nuclear Materials - Volume 353, Issues 1–2, 1 July 2006, Pages 1–11
نویسندگان
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