MCNP5 vs MCNP6.2 syntax difference

  • Thread starter werling3
  • Start date
input can run on MCNP5 but not on MCNP6
So I am getting a fatal error on a tally that contains a universe definition in it.

f12:n (10<(u=1))
sd12 1.0
e12 0.1 20.0

the error specifically says "fatal error. invalid universe format in f card bin 1 tally 2."
However, this input is able to run on MCNP5 without experiencing a fatal error.
Does anyone know if this is simply a syntax problem & how it could be fixed.


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