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Topical from Hanhikivi 1 project: works in the main pit continue

During the early autumn, Fennovoima submitted licensing documents to the Radiation and Nuclear Safety Authority for approval. At the same time, construction work in the main pit continued with topsoil removal and additional groutings.

In August, construction works in the main pit of the Hanhikivi 1 NPP continued after a long break. The plant supplier RAOS Project will carry out the excavation works in three phases. In the first phase, the soft soil was removed from the area, and additional groutings were made. In the second phase, which will start in October, the pit will be excavated to the level of -2 meters from the sea level throughout. The estimated amount of rock to be excavated is approximately 120,000 m3. In the third phase, excavation of the plant site will continue to the final foundation level, located nearly 20 meters below sea level.

"Some changes were made to the layout of the plant during the design phase, which meant that the boundaries of the main pit had to be revised. The goal is to start the works of the third phase at the turn of the year," says Jouni Sipiläinen, Fennovoima's Construction Director.

Titan-2's subcontractor Metrostav a.s. began work in the main pit in mid-August.

In addition to the main pit, work on the Hanhikivi 1 power plant's construction base has also progressed during the summer. Ten warehouses have been completed at the plant supplier's warehouse area, which will serve the site during the construction phase.

On the left, plant supplier's construction base in September 2021. On the right, warehouse area along Hanhikiventie road.

In September, site services also improved significantly when a new 600-seat site canteen opened its doors. The foodservice company Compass Group Suomi is the operator of the canteen.

The site canteen opened its doors in September.

On Fennovoima's administration building site, the fifth-floor frameworks and facade installations are currently underway. The building will include a workspace for about 300 Fennovoima employees.

Fennovoima's administrative building in September 2021. The five-storeyed building is constructed by Lehto Tilat.

Licensing has also progressed during the summer and early autumn. Fennovoima submitted a construction plan for the reactor pressure vessel to the STUK for approval at the end of September.

"We are now waiting for the authority's approval of the construction plan, after which we would be ready to start manufacturing the pressure vessel materials," says Jouni Takakarhu, Fennovoima's Project Director.

The reactor pressure vessel is the so-called long-lead item (LLI) that, according to nuclear legislation, can be manufactured before the construction license is granted. The pressure vessel of the Hanhikivi 1 power plant is about 11 meters high and weighs more than 300 tons. The pressure vessel and its welds must last the entire life cycle of the plant for 60 years.

Reactor pressure vessel installation at the LNPP-2 in Sosnovyi Bor, Russia. Photo: Aleksandr Kashin, Titan-2

By the end of September, Fennovoima has submitted 10 of the 15 Preliminary Safety Analysis Report (PSAR) batches for approval to STUK. The following batches will be delivered in October-November. PSAR is the most important deliverable accounting for approximately 80-90% of all documentation required for a construction license.

In August, Fennovoima signed an agreement with Pyhäjoen Teollisuusyhtiö for the premises of the visitor center. The facilities reserved for Fennovoima's visitor center include an exhibition space, an auditorium and various support facilities. Its total area is about 800 square meters.

"The main theme of our visitor center is nuclear power as part of a sustainable future. The goal is to create a world-class visitor center, where diverse narration and modern technology create the framework for a meaningful and unique visitor experience," says Sakari Kotola, Fennovoima's Communications & PR director.

The planning of the exhibition is now underway, which will be assembled after the completion of the Pyhäjoki House. In time, the visitor center will serve everyone interested in nuclear power, energy and the Hanhikivi 1 project.

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