Loviisa nuclear power plant, Finland
ŠKODA JS has been a supplier for the Loviisa nuclear power plant in Finland since 1996, when our company supplied the first 80 pieces of graphite gaskets. To this day, the number of graphite gaskets supplied to Loviisa NPP is around 7,000.
The year 2001 represented a major milestone, when we supplied the first 104 pairs of fuel assembly components (top and bottom nozzles) as well as 104 shrouds through our customer, then the BNFL Company, today the British company Westinghouse. By 2007, we had delivered a total of 735 pairs of top and bottom nozzles and 741 shrouds. In 2001, we also supplied Loviisa NPP with the MKM-3 control rod drive tension meter.
In 2003, we produced for the Loviisa NPP the EZ 650 flange joint stud tensioner. In 2005, we produced another special tensioner for the flange joints of neutron flux and temperature measurement nozzles. Both tensioners were completely developed by our colleagues at ŠKODA JS, and we managed to replace the originally manual tightening of the said flange joints using torque wrenches with an electronically controlled device, which reduced the labor intensity of flange joint tightening, thus significantly slashing the time required for this task and thus also the power plant’s outage.
In 2020, we delivered a new EZ 650 PRO tightening unit to FORTUM for the Loviisa NPP in Finland. The electrically controlled tightening unit EZ 650 PRO is designed for tightening and loosening the joint of the control rod drive and the VVER 440 reactor drive housing. Its design allows performing these operations in the upper unit of the shut-down reactor and in the upper unit maintenance station. The control and the parameter setting take place via the touch screen together with the USB interface enabling importing or exporting the sets of working parameters of the tightening unit and exporting the measured values of tightening torques.
Since 2010, we have also been providing the Loviisa NPP with regular supplies of intermediate rods for control rod drives. By 2020, we had produced and delivered a total of 91 of them.
The history of the project
1996the first delivery for Loviisa NPP – 80 pcs of graphite gaskets
2001delivery of the MKM-3 control rod drive tension meter
2001-2007deliveries of fuel assembly components, a total of 735 pairs of top and bottom nozzles and 741 shrouds
2003we supplied a tensioner of our own design, EZ 650, for the reactor flange joints
2005we supplied a special tensioner for the flange joints of neutron flux and temperature measurement nozzles (ŠKODA JS’s own design)
2010-2020we supplied a total of 91 pcs of intermediate rods for control rod drives
2020we supplied EZ 650 PRO tightening unit