At present, earth and water construction work in preparation for the construction of the nuclear power plant are ongoing at the Hanhikivi 1 plant area. Side dams of the cooling water discharge channel are being constructed. Dock basin breakwaters will be lined with stones. Dredging of the discharge channel and excavation of the channel inside the cofferdam will also continue.
According to the plans, the excavation and blasting of the plant site and cooling water tunnels will continue until 2022. Levelling concrete will also be poured at the plant site.
Actual construction in the plant area will start once a construction license based on the Nuclear Energy Act has been granted for Hanhikivi 1. Separate permits or licenses are required for any construction at the Hanhikivi 1 construction site, however.
“So far, more than 80 permits for landscaping, construction and other actions, as well as water and environmental permits have been granted for the construction site,” says Jouni Sipiläinen, Construction Director of Fennovoima.
From a plot of land to a site area
Hanhikivi 1 is a greenfield investment, which means that everything has been built from scratch. The power plant will be constructed at the seashore that was previously forested without any municipal engineering. At this point, the construction site has been raised to three meters above sea level. The final elevation of the plant area will be 4.6 meters above sea level. Hence, seawater will not be able to harm safe operation of the nuclear power plant at any point during its lifecycle of a hundred years.
“The actions that caused the most workload included the construction of Hanhikiventie from highway 8 to the construction site and the construction of electricity, water, and plumbing connections,” Sipiläinen says.
“More than 80 permits for landscaping, construction and other actions have been granted for the construction site.”
“On the other hand, one of the benefits of a greenfield project is the fact that you don’t have to consider any existing buildings or infrastructure elements when planning the area.”
So far, 1.5 million cubic meters of blasted and crushed stone has been used as the artificial fill for Hanhikiventie and the site area. That is fourteen times the volume of the Parliament House. The stone material was taken from quarries along Hanhikiventie.
“The total volume of the plant excavation is approximately one million cubic meters, of which a little over half is rock and the rest is moraine or glacial till. All of the excavated materials will be used as artificial fill in the site area,” Sipiläinen says.
The plant excavation is a pit that is 400 meters long and 300 meters wide. Many of the plant area’s largest buildings will be constructed on top of a thick concrete slab to be poured into the excavation.