Switzerland won't get a tsunami, even if a M7 earthquake takes place. Also it's in the middle of Europe so better interconnected with other grids. Passive cooling is next to useless if your reactor containment and/or the passive cooling tanks or radiators break due to an earthquake. You still need power to drive pumps to cool down the reactor until the nuclear reaction is fully stopped and all heat removed. The fuel still generates heat after the rods are removed and nuclear poison is injected.