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Sn=Sn0 [1+b(r/R)^2]

where Sn is volumetric thermal energy, r is radius and R is radius of the fuel pellet.

The text state that b is a dimensionless positive constant but post no refrence for this equation or what b is based on. Does anyone know where to find this info or what a general magnitude for b is?

I'm trying to calculate fuel melt for a loss of cooling accident in BWR with a fuel pellet swelling to the cladding. Thanks!!