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​Steam-driven Alternate Coolant Injection System will be installed into Olkiluoto reactors

30.6.2015

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Olkiluoto is undergoing major projects for improving safety and reliability of the plant units. The safety of the nuclear power plant is being improved by preparing the plant units for extreme external threats. Among other things, the systems used for reactor cooling are being improved. In addition to multiple power supply back-up systems, a steam-driven high-pressure Alternate Coolant Injection System to pump water into the reactor will be installed at OL1 and OL2 plant units. The system would operate even when most of the Olkiluoto power supply back-up systems were lost.

The high-pressure Alternate Coolant Injection System (ACIS) is driven by the steam generated in the reactor. The system will start automatically if the internal electricity grid is lost.

An agreement to deliver the steam pumps needed for the ACIS has been concluded with SPX Clyde Union. The pumps will be built at the company's facilities in Glasgow, UK.

- Continuous investment in safety enhancement is a priority for TVO. The pump system of SPX Clyde Union proved to operate under complete blackout conditions and even when submerged. That is why it well fulfilled our stringent requirements for reactor Alternate Coolant Injection System, Kari Hakala, Project Manager of TVO, says.

The Alternate Coolant Injection System with its pumps is scheduled to be installed at the plant units in 2017–2018.

For more information, please contact:
Kari Hakala, Project Manager, tel. +358 2 8381 3539.

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