348 Save for later Print Download Share LinkedIn Twitter The 1,200 megawatt "next-generation" pressurized water reactor (PWR) unveiled by Japan's Mitsubishi Heavy Industries (MHI) comes amid a major government push for more nuclear energy, but with an uncertain future. If ever developed the "SFZ-1200" would likely be used to replace aging PWRs in the Japanese fleet, or even reactors in decommissioning.