The French nuclear company said will design, deliver and install new instrumentation and control (I&C) systems and replace the thimble tubes, which are an important part of the facility’s in-core neutron flux measurement system.
Framatome’s team will replace the plant’s existing I&C system that is part of the anticipated transient without scram mitigation system actuation circuitry (Amsac) cabinets. The Amsac system provides backup to the primary protection system responsible for tripping the turbine and initiating auxiliary feedwater flow. It was developed to prevent excessive reactor coolant system pressure after an anticipated transient without scram (ATWS) event.
Framatome will also design, supply and replace 36 thimble tubes, including thimble tubes with a new nitriding surface hardening process designed for increased longevity, and complete a study on tube wear behaviour.
The Krško nuclear station, operated by operated by Nuklerana Elektrarna Krško, is in southeast Slovenia. It has a single 688-MW pressurised water reactor with that began commercial operation in January 1983. The facility is co-owned by Slovenia and Croatia.
