In France, there are enough reactors so that they can be rotated out of service one by one without making a huge hole in production (and the pauperized maintenance staff tour around France as their jobs move, sleeping in caravans etc.) The homogeneity of the plant makes this fairly easy to plan. Until you get the same systemic problem everywhere at the same time, of course...

_{It is rightly acknowledged that people of faith have no monopoly of virtue - Queen Elizabeth II}