Temelín NPP – Modernization of Hydraulic Regulation of TG and PSK to HP Hydraulic System

In 2014 and 2015, two implementation stages of the modernization of the hydraulic regulation of the turbine generator (TG) and the bypass steam dump to condenser (PSK) took place on Temelín NPP Units 1 and 2. The modernization concerned increasing the reliability of the high-pressure hydraulic regulation system and, quite recently, the mutual separation of the regulation oil systems for TG and PSK. The project included the modernization of the flow parts of the low-pressure parts of the turbine, which involved the complete replacement of all three low-pressure parts of the rotor. After the overall modernization, the nominal power output of the production unit was increased to 1,080.25 MWe with a heat input to the secondary circuit of 3,132 MWt.

On Unit 2, the project designated B730 took place in the schedule shortened by seven days, which involved starting up the turning gear of the modernized turbine generator including completely new high-pressure oil regulation within 48 days of the desynchronization of the unit. In this short period of time, great emphasis was placed on capacity planning as well as the interaction of all suppliers.

The preparation of the capital investment project B730 began as early as 2010, which mainly included links between the new high-pressure hydraulic sets and servo drives to the existing WESTINGHOUSE control system, including HW modifications in this control system, newly installed power and communication cabling, modifications to the switchboards and completely new I&C cabinets, as well as proposals for control algorithms and proposals for new displays. The capital investment project, which was one of the most closely monitored modernizations at the Temelín NPP, ended with the successful implementation on Unit 2. Our company participated in the capital investment project B730 for Doosan Škoda Power s.r.o., from design preparation to implementation for a period of seven years.