In the News: APWR Mitsubishi
As a result of extensive verification and qualification testing, we have developed an Advanced Pressurized Water Reactor (APWR) design that is more efficient with greater output than any previous power plant. This design has been slightly modified to satisfy U.S. and international utility requirements as the US-APWR, and it will become the design that we sell around the globe. The US-APWR satisfies our customers’ requirements with the best performance for safety, economy, operation and maintenance.
The main specifications of the US-APWR are:
Electric Power 1700 MWeCore Thermal Power 4451 MWtReactor Fuel Assemblies 257Reactor Fuel Advances 17 x 17, 14 ftActive Core Length 4.2 metersCoolant Flow 2.75 x 104 m3/h/loopCoolant Pressure 15.5 MPaSteam Generator Type 90TT-1Number if Steam Generators 4Reactor Coolant Pump Type 100ANumber of Reactor Coolant Pumps 4Reactor Coolant Pump Motor Output 6000 kW
Features of the US-APWR include:
More Environment Friendly
The US-APWR has several design features to improve plant economics. The core is surrounded by a steel neutron reflector which increases reactivity and saves ~0.1wt% U-235 enrichment. In addition, the US-APWR uses more advanced steam generators (compared to the APWR) which create drier steam allowing for the use of higher efficiency (and more delicate) turbines. This leads to a ~10% efficiency increase compared to the APWR.
Several safety improvements are also notable. The safety systems have enhanced redundancy, utilizing 4 trains each capable of supplying 50% of the needed makeup water instead of 2 trains capable of 100%. Also, more reliance is placed on the accumulators which have been redesigned and increased in size. The improvements in this passive system have led to the elimination of the Safety Injection system, an active system.