The Temelín Nuclear Power Plant is located in the Czech Republic, approx. 24 km from the regional capital of ČEské BuděJovice. It produces electricity in two production blocks with pressurised water reactors VVER 1000 type V 320. In the spring of 2003, the Temelín Power Plant with its installed capacity of 2,000 MW became the largest source of energy in the Czech Republic.
The initial project was prepared by Energoprojekt Praha (EGP) in 1985, and the actual construction of operating facilities began in 1987. However, in 1989 a decision was made to reduce the number of blocks. After a period of great uncertainty, the reduced structure with modernised technology was completed, and in July 2000 fuel was delivered to the reactor. On 21 December 2000 the first block generated electricity. The power plant operates with an output of 1 x 1,078 MWe + 1 x 1,055 MWe.
The Temelín Nuclear Power
Plant was designed and built to be resistant to the effects of adverse external events such as:
• Climatic effects (wind, snow, rain, outdoor temperature)
• External flooding
• Impact of flying objects (including aircraft)
• Pressure waves from explosions
Before the Temelín Nuclear Power Plant was put into operation, South Bohemia was dependent on electricity supplies from other regions, mainly from the ecologically burdened northern Bohemia. The construction of a major energy source allowed addressing electricity shortages and the difficult ecological situation in northern Bohemia, since the Temelín Power Plant made it possible to replace obsolete and gradually shut down blocks in coal power plants. Upon the launch of two Temelín blocks, together with the Dukovany Nuclear Power Plan, the share of production of nuclear sources increased to 42.5%.
Plans for the construction of blocks 3 and 4
The construction of additional blocks 3 and 4 was planned as part of the energy policy in Temelín from 2018 - 2022. However, based on a governmental decision the ongoing tender for the completion of the blocks was cancelled in 2014, and currently our partner Spálovský is waiting for a new assessment of the need to build nuclear blocks in the Czech Republic.
As part of the planned new construction, Spálovský, a.s. has successfully qualified their equipment of low-voltage switchgear to the investor, contracting authority and suppliers. The qualified equipment is based on the concept of switchgear previously produced and supplied to the Mochovce Power Plant (Slovakia), and respects the demanding criteria adopted after the incident in the Fukushima Power Plant in Japan. This means that a modular design in the CUBIC system with Schneider Electric components was proposed.
The present requires and relies on quality and certified systems
In 2016, our Czech partner Spálovský, a.s. won the tender/ was awarded the contract, and supplied switchgears to the Temelín Nuclear Power Plant as part of regular restoration, specifically for the project entitled “Replacement of Control System, System of Internal Consumption and Power Output of the Diesel Generator Station and Reserve DGS”.
Description of project/technical facts:
The switchgear for internal consumption of the diesel generator is in the category of selected devices BT 2 seismically resistant, class 1a. It is designed in the CUBIC system and type tested as PC 1, voltage system 3+PEN, 400/230 V, 50 Hz, TN-C. Busbar rated current 200 A, Icw = 20 kA, Ipk = 42 kA, protection IP 40/IP 00, inlets and outlets underneath.
The switchgear is designed with separation of the individual parts of the switchgear 2b according to IEC61439-2. There are guards on the switchgear from the top, rear and both sides. The bottom side of the switchgear is open, protection is achieved by placing the switchgear on the floor (steel frame). From the service side each field is divided into individual inlets and outlets that will be placed on separate instrument blocks with separate doors.
Furthermore, individual blocks are separated from the shared cable compartment which is provided with a door on the front side. All instrument blocks and cable compartments are separated from distribution busbars. The location of individual outlets is designed identically to the existing switchgear. Control and signalling elements are placed on the doors of individual outlets.
Overall, 8 switchgear assemblies with five fields each will be delivered to Temelín. The last delivery is planned for early 2018.