A water-filled reactor with volume of 50 ft3 is at 2000 lbf/in 2, 560 F and placed

Question:

A water-filled reactor with volume of 50 ft3 is at 2000 lbf/in 2, 560 F and placed inside a containment room. The room is well insulated and initially evacuated. Due to a failure, the reactor ruptures and the water fill the containment room. Find the minimum room volume so the final pressure does not exceed 30 lbf/in 2.