Abstract
This paper presents an attempt to evaluate the heat transfer rates and
gas release rates in the CCI core–concrete interaction experiments 1–3,
performed within the OECD MCCI project. A new method for calculating the
heat transfer rates has been developed. It is based on calculating
integrals of the concrete enthalpies with the help of piecewise
exponential interpolation curves. The new method takes into account heat
conduction in the concrete. Compared to traditional methods, the new
method gives better results during slow concrete ablation, and its time
resolution is significantly better. The gas release rates from the
concrete were also calculated. A regression analysis was conducted for
the heat transfer coefficients and gas release rates. Three correlations
for the bubbling-enhanced heat transfer were developed. For the
basemat, a single correlation can be used for both siliceous and
limestone/common sand (LCS) concrete types. For the sidewall, two
different correlations are needed for the two concrete types. With the
same superficial gas velocity, the heat transfer rate to siliceous
sidewalls is higher than to LCS sidewalls. This suggests that the reason
for the different radial ablation rates of the concrete types observed
in the tests is not the lower gas content of siliceous concrete.
Original language | English |
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Pages (from-to) | 2377-2386 |
Journal | Nuclear Engineering and Design |
Volume | 238 |
Issue number | 9 |
DOIs | |
Publication status | Published - 2008 |
MoE publication type | A1 Journal article-refereed |