A Water-cooled Pressure Tube Blanket (WPTB) for fusion driven subcritical reactor has been designed, the design goal of the blanket is to achieve 3000MW thermal power with self-sustaining tritium cycle. Pressurized water has a great advantage in the energy production; however the high pressure may cause some severe structure design issues .This paper proposed a brand new concept of water cooled blanket. As result of adopting pressure-tube, the thickness of the first wall can be significantly reduced. The numerically simulating and calculating of temperature, stress distribution and flow analyses were carried out and the feasibility of using water as coolant were discussed. The results demonstrated the engineering feasibility of the water-cooled fusion-fission hybrid reactor blanket module.
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