4 Factor formula parameters

[zouzou974]

Hi everyone,
Is it possible to obtain the parameters of the 4 factor formula for the case of an LFR. I’ve inspected the tallies and the other variables in the statepoint output file but it is not mentioned. Does openMC calculate these coefficients?

[campagnani]

Check this:

Four factors formula

Hi Paul and Adam, Happy new year 2014. Out of curiosity, I wanted to reproduce the value of K_infinity from reaction rate tallies. I adopted the indc-usa-107 problem 1 from benchmarks-master examples. Results: (see attached files) The four factors formula underestimates K_infinity. While comparing to results of MCNP, I found that the reproduction factor η is strongly underestimated by OpenMC even if the results for ν Σ f are the same for both the two codes. Whereas the thermal utilization fa…