The Finnish Radiation and Nuclear Safety Authority
(STUK) has on 15.2.2016 granted Loviisa nuclear power plant’s solidification
plant a permission to start full operation.
The plant will solidify the liquid radioactive waste generated during operation
and decommissioning of the Loviisa power plant. This waste primarily consists
of ion exchange resins used in the purification of process water as well as bottom
sludge from evaporator concentrate tanks. The solidification process is highly automated
and the process is controlled from a control room at the solidification plant.
The solidification plant is included in the Loviisa
power plant’s operating licence, and licensing process was handled as a plant
modification. The solidification plant operates as an independent facility in
its own building in the power plant area, so the separate safety assessment conducted
by STUK was more extensive than for a typical plant modification. STUK found
the design, construction and commissioning of the solidification plant to be
safe and in accordance with regulations.
“Loviisa power plant’s solidification plant is a pilot
plant; its planning and successful implementation is the result of the long-term
development efforts by Fortum’s own competent personnel. The plant’s commissioning
phase started in 2006; during the test runs, the solidification recipes were
developed and tested and the manufacturing method for the final disposal containers
and the resin transfer systems were improved,” says Thomas Buddas,
Deputy Director, Loviisa Nuclear Power Plant.
A total of about 900 m3
of intermediate-level radioactive ion exchange resins and evaporator concentrates
for solidification have accumulated throughout the Loviisa power plant’s history.
Now the solidification of this stockpile will begin in full scale. The goal is
to get all the liquid waste processed before the Loviisa unit one reactor’s
operating licence expires in 2027. When the decommissioning of the power plant starts,
the liquid waste generated in the purging of the system and in the dismantling work
will be processed in the solidification plant.
“The waste will be cemented directly in final disposal
containers, which, after intermediate storage, will be deposited into the final
repository for power plant waste, located on-site in the power plant area. The
advantages of cementation include fire safety and the concrete’s ability to effectively
absorb radioactive materials. The waste can be handled in small batches, making
the process safe and easy to control,” Buddas says.
Thomas Buddas, Deputy Director,
Loviisa power plant, tel. +358 50 455 3710
Loviisa power plant
In 2015, the load factor at
Fortum’s fully-owned Loviisa nuclear power plant was 92.9%. On an international
scale, the load factor was among the best in the world for pressurised water
reactor power plants. The plant produced a total of 8.47 terawatt hours, which
is approximately 13% of Finland’s total electricity production. The Loviisa
power plant employs approximately 500 Fortum employees and 100 permanent
contractors. In 2015, Fortum invested EUR 80 million into the Loviisa nuclear
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