Are Nodal Methods More Accurate or Just Simplified Solutions?

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libertad
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I'm not sure does Nodal method just simplify and accelerate the solution of diffusion equation or it is accurate instead of simple finite difference methods.
Is there any idea?
 
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Nodal methods are practically just as accurate as long as the size of the node is large compared to the mean free path of neutrons. Which works fine for large power reactors.