Mitsubishi Heavy Industries, Ltd. (MHI) has delivered two replacement steam generators (RSGs) for unit 3 of Southern California Edison’s San Onofre Nuclear Generating Station (SONGS). The RSGs are due to be installed in a maintenance and refuelling outage this autumn.
SONGS 3 is an 1100MWe pressurized water reactor (PWR) that went into operation in 1984. In September 2004, SCE ordered RSGs for SONGS units 2&3. The RSGs for unit 2 were delivered in February 2009 and installed during a summer outage.
The RSGs, which are 20 meters (65-feet) long, were manufactured at MHI’s Kobe Shipyard & Machinery Works. They are among the world's largest, each measuring nearly seven meters (22 feet) in outer diameter and weighing 580 metric tons (641 short tons).
To date MHI has received orders for 31 RSGs from overseas, mainly from North America and Europe. When SGs for new power plants and RSGs for the domestic market are included, the total reaches 125 units.