Dear Zahid,
You’re overall approach is correct, but I found several mistakes in your spreadsheet. Please find my commented spreadsheet attached. With my corrections, I calculate the rotor mass and inertia about its CM as follows:
Mass = 110000
Ixx = 4.37E7
Iyy = 1.99E7
Izz = 2.01E7
Ixy = 0
Izx = 8.3E5
Iyz = 0
5MW_Turbine_Inertia_2019_JJ.xlsx (210 KB)
Best regards,