I have some questions regarding to the calculation of WRC 107.

May I know how can I calculate the dimensionless parameter like U and RHO?
As I know TAU = nozzle mean radius/ nozzle wall thickness.

Is the following equations correct?
Gamma= Rm/T, Rm= mean radius of the vessel, T= Thickness of the vessel
Beta= 0.875*ro/Rm, ro = outside radius of the nozzle

May I know what is T stands for in the Nx/T? Is it the thickness of the vessel?

Thank you!