This is about the amount of power generated in a large nuclear reactor.
The large nuclear reactor at Vinca has been closed since 1984, he said.
A large reactor typically generates enough for 20 nuclear bombs each year.
The room contains a large reactor and other severely damaged equipment.
Washington is also concerned about what one official called Iran's "shopping around" for a much larger nuclear reactor.
When it first started up, it was the largest nuclear reactor in the world.
In the 1970's, many utilities rushed ahead with large reactors when the price of oil jumped.
By contrast, a large nuclear reactor can produce 1,100 megawatts of power.
After all, a large fast reactor could cost not much less than £2000 million to build.
Typically, a large commercial reactor costs up to $4 billion.