A WVER type nuclear plant layout is given in previous figure. The coolant is pressurized after the pump $($node $1)$ and the pressure is about $15\mathrm{.}84$ MPa $.$ The flow rate is approximately $4400k\frac{g}{s}$ at node $1.$ When the flow reaches to core region $($node $3),$ it separates into $4238$ channels and each channel size is given in following figure. Assuming triangular lattice, creates a flow area, the mass flow rate divides into $4238$ channels and connects at node $4.$ Between node $6$ and node $7,$ there is $11000$ tubes relate to the diameter of $13$ mm $.$ Assuming the tubes are smooth, please calculate pressure at given nodes and calculate total pressure drop between node $1$ to $8($assume $1$ and $8$ are in same height$)$