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Next: Zero flux Up: Boundary conditions Previous: Boundary conditions   Contents   Index

Extrapolation

In the first case we choose a combined Dirichlet-Neumann type boundary condition

\begin{displaymath}
\phi^g(\hspace{0.2ex}\underline{r}{}\hspace{0.15ex}) + (\hs...
...hspace{0.15ex}=\hspace{0.2ex}\underline{R}{}\hspace{0.15ex}(s)
\end{displaymath} (1.8)

where $\hspace{0.2ex}\underline{d}{}\hspace{0.15ex}$ is the so-called extrapolation distance1.6. The extrapolation distance is dependent on the media surrounding the reactor core (a reflector) and to some extent the composition of the core. The problem is to obtain a reasonably accurate value of the extrapolation distance.

 
 

 
 
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