Maintenance of reactor building logical units

Our major contract is the comprehensive maintenance of the Reactor Building Logical Unit in all Czech nuclear power units, i.e., four VVER 440 units at the Dukovany NPP and two VVER 1000 units at the Temelín NPP. ŠKODA JS provides maintenance of the primary circuit equipment in all units based on general contracts concluded in 2008 and 2016. The contract covers the period until 2021.

Every year, we perform tasks of standard scope during scheduled outages as well as a number of unscheduled activities. For example, in 2018 we removed and disposed of 41 pcs of neutron flux measurement channels at the Temelín NPP using new equipment developed and produced by ŠKODA JS; we performed an inspection of the steam generator, repaired weld joints, performed an inspection of the hydraulic accumulator and the emergency cooling exchanger, and tested and optimized the POMA equipment for cutting material ampoules at selected clusters of the reactor core – this device was also completely developed and produced by ŠKODA JS.

At the Dukovany NPP, in 2018 we repaired a defect in the guide wheel and the pressure lid of the main circulation pumps, assembled a secondary thermal barrier on the main circulation pumps, replaced the bodies of the main safety valves of the pressurizer system, cleaned the bottom of the reactor pressure vessel, cleaned the reactor core bottom drop shock absorbers using a single-purpose device developed by ŠKODA JS, and performed a number of other activities.

ŠKODA JS is a reliable partner for power plant operators for unit outages, during the preparation and execution of maintenance as well as for preventive and corrective maintenance. The Company takes advantage not only of its service departments’ experience, but, as an original equipment manufacturer of nuclear systems with many years of extensive experience, also of the support from its other specialized departments.