How to get the delayed neutron fraction with depletion?

I had known that it could use Kprom(only consider prompt neutrons to compute K) to calculate the delayed neutron fraction.
image
But I do not think using Kprom with depletion is right. For example, I want to know the Kprom in 5GWd/t. But I only consider prompt neutrons to run the openmc from 0GWd/t to 5 GWd/t. If I use the Kprom in 5GWd/t and Keff in 5GWd/t to compute the delayed neutron fraction in 5GWd/t, it will lead to a wrong result.
I want know if it can output some files with depletion, that I can use these files to compute their value of Kprom in steady state.