Both units now offline again, but ČEZ has bought electricity to cover shortfall
Temelín, South Bohemia, Aug 12 (ČTK) — Staff at Czech nuclear power plant Temelín took the second unit offline in the small hours today due to a defect in the generator’s cooling system in the non-nuclear part of the plant, Temelín spokesman Marek Svitak told ČTK.
The unit resumed power supplies on July 31. The scheduled shutdown lasted 104 days, longer than planned, due to a steam generator leak.
The generator is being depressurised and one of the six penetrating openings that has been damaged will be replaced, Svitak said.
The second unit may be restarted at the beginning of next week, he added.
The shutdown of the first unit continues in line with the schedule. Fuel in the reactor has been exchanged, and staff is now testing the tightness of the reactor containment building. The block will be connected to the grid by the end of August.
Unit two reached full performance on August 2 following 20 days during which Temelín was completely out of operation. The unit’s output is now 2 percent higher at 1,078 MWe thanks to new rotors.
The turbine in unit one was upgraded last year.
Buyers of electricity will not feel the shutdown of both units at once only thanks to the fact that power company ČEZ, which runs Temelín, has covered the shortfall by purchase of electricity abroad.
“ČEZ bought enough electricity abroad last night to offset the shortfall. The situation in the Czech power grid is thus completely balanced,” Barbora Peterová, spokeswoman of power grid operator ČEPS, told ČTK.
ČEZ spokesman Ladislav Kříž said that ČEZ has almost constantly sold out the electricity it produces so only a small part is for daily trading.
“In case of unexpected events, we will buy electricity on the markets. This would be nothing exceptional,” he added.
Temelín launched power production in December 2000. It is the largest Czech power source, covering one fifth of the country’s consumption.
The power plant has produced 7.95 billion kilowatt-hours of electricity this year. Because of the longer shutdown of the second unit Temelín will not surpass its 2012 record, when it generated 15.3 billion kilowatt-hours of power.