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STUK approved the overall plan for I&C at OL3

STUK approved the overall plan for I&C at OL3

10 Apr 2014 10:00
Press release

On 10 April 2014, the Radiation and Nuclear Safety Authority (STUK) approved the overall plan for the I&C (instrumentation and control) in the third nuclear power plant unit under construction in Olkiluoto, Eurajoki. The approval means that STUK can start reviewing the more detailed system-level I&C plans. For the assurance of the overall safety of I&C, STUK has further required an analysis of the consequences of potential faults of I&C.

A principal objective of STUK has been to make sure that the design of the I&C architecture is compliant with the principle of independence. The automatic systems which ensure the safety of the plant when something goes wrong must not be dependent on systems that are running during normal operation.

In the earlier plans presented to STUK there were interconnections between the systems. These interconnections were unacceptable. In the current amended plans the interdependencies were reduced but there were still some system interconnections left in the plans. These interconnections must be removed. However, the changes required are so limited that STUK was able to approve the I&C architecture plans and can start the review of the system-level plans.

In parallel with the system-level planning, Teollisuuden Voima (TVO) and the plant provider are carrying out a mandatory analysis of the consequences of potential I&C failures for the plant. The final approval of the I&C architecture plans depends on the results of that analysis.

Areva and Siemens, providers of the I&C system to OL3, started to test the I&C systems last week on a test bay in Germany. The final test bay tests will be carried out according to plans approved by STUK. STUK will be overseeing these tests on-site.

Link to the decision 10.4.2014 (in Finnish, pdf)

Further information:

Deputy Director Tapani Virolainen, tel. +358 9 759 88 671
Senior Inspector Mika Johansson, tel. +358 9 759 88 764

Nuclear safety
14 May 2015 20:08
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