The world’s oldest nuclear power plant still in operation was reconnected to the Swiss grid on Tuesday after a malfunction led to an automatic shutdown a day earlier. The Axpo energy company said the steam generator in Block 1 at the Beznau plant, 30 kilometres north-west of Zurich, was fixed after experts rectified a faulty valve. As a result of the malfunction, water vapour was at times visible above the facility on Monday, but there was no danger to people or the environment, the company said. Located less than 7 kilometres from the German border, the block at Beznau was commissioned in 196…