Westinghouse said on 17 May that it will deliver new feedwater spargers under contracts signed with Olkiluoto’s owner and operator Teollisuuden Voima Oy (TVO). The scope of the contract is for designing, analysing, manufacturing and installing eight feedwater spargers, which distribute water from feedwater lines through the reactor pressure vessel. Westinghouse said it will "apply advanced techniques to increase the feedwater spargers’ resistance to thermal fatigue, improving operational life, as well as reduce thermal loads of the surrounding structures".

The design and analysis work will be carried out by Westinghouse in Västerås, Sweden, and the manufacturing at a local supplier in Finland. All equipment will be delivered to the Olkiluoto site during spring 2017. A Westinghouse outage services team will install the first four spargers within the planned outage time in May 2017, the company said.