@AnungIkwe @vic They have so many sensors on Western nuclear reactord that if a pinhole leak occurs, they'll have it caught in seconds. They can't even use regular smoke detectors on some of those areas because the spare alpha particle emissions can trigger sensors. Mother nature could still do something insane like a massive unpredictable earthquake damaging the reactor site in an uncontrollable way, but that's why people prefer molten salt and other styles of reactors that are "off-line" when they stop working rather than at risk of going critical.