Thermal efficiency vs. Thermodynamic efficiency

Amy7000

Hi,
From the definitions of each term:
* Thermal eff. = W(actual) / Q'
* Thermodynamic eff. = W(actual)/W(max)

For PWR secondary cycle can we accept that thermodynamic eff. = thermal eff. ?

For ideal machinery, how can we calculate the thermal eff. of the secondary steam cycle in PWR (in simple T-S diagram)??