The regular reactor containment leak-tightness test has been completed at Unit 1 today. Its goal was to verify the leak-tightness function of the containment, i.e. its ability to prevent leaks of radioactive substances from the nuclear part of the power plant. The results have demonstrated that the containment structure meets all leak-tightness criteria.
The test is carried out regularly once per 4 years and, in its course, there are setup pressure conditions higher by 70 kPa than the atmospheric pressure in the containment.
The Unit’s 1 outage got this way into its last third. The turbine generator modernization is being completed and additional works related to the Unit restart preparation are carried out. The outage schedule assumes that Unit 1 will resume its operation at the end of September.

The containment (protection envelope) is one of the major safety barriers of the Temelín Nuclear Power Plant. There are located the most important parts of the power plant – reactor and other reactor coolant circuit process equipment - in the containment. It is a reinforced concrete cylinder 56 meters high covered with a spherical cap. The cylinder walls are 1,2 meters thick, the structure of the cap is only by ten centimeters thinner. The internal diameter of the containment is 45 meters. The internal surface of the containment is covered with an 8 mm thick layer of stainless steel that hermetically seals the internal space and, in this way, prevents leaking of radionuclides into the environment.

Information on parameters at Unit 1 today on September 12, 2007 at 10:00 o‘clock:

• Unit is in Mode 6
• Reactor power is 0 %
• Turbine generator output - 0 MWe
• Electricity production since the beginning of the year: 2 964 775 MWh

Information on parameters at Unit 2 today on September 12, 2007 at 10:00 o‘clock:

• Unit is in Mode 1 - power operation
• Reactor power is 100 %
• Turbine generator output - 1012 MWe
• Electricity production since the beginning of the year: 4 442 837 MWh