dear all,
I want to find the reactivity coeficient of a fuel, can i use this example? or you have another way to get the reactivity coeficient of the fuel?
thanks,
Indah
dear all,
Hi Indah,
I haven’t checked that example, but usually when you want to determine a reactivity coefficient, for instance the fuel Doppler coefficient, you run two different simulations (different fuel temperatures) and calculate the reacttivity coefficient with the equation alpha = (k2-k1)/[k2k1(T2-T1)].
Javier
Yes, @Javier_Gonzalez is correct. The screenshot you showed is not relevant to reactivity coefficient calculations. Calculating a reactivity coefficient involves figuring out how much k-effective changes in relation to some system parameter (temperature, for example). In a criticality search, the goal is to determine the value of a parameter that results in k-effective = 1. So, they can be related — knowing a reactivity coefficient gives you an idea of how you might need to change a parameter to get to k=1 — but they are two independent problems.
Thank you sir, @Javier_Gonzalez @paulromano
I think I can use that example, because at the end get the reactivity coefficient of boron.
So can I use the method: make a cell pin model and use openmc.run (), to get the reactivity coefficient (not just the reactivity coefficient of the fuel)
Yes, hypothetically you can use the results of the criticality search to determine the reactivity coefficient with respect to whatever parameter was being changed, but that’s a relatively inefficient way to do it. You really only need to perform simulations (openmc.run) for two different values of the parameter of interest, whereas a criticality search may involve many more simulations to converge on a value of k=1.