津波が来なくても障害されていた

Natureから

The latest analysis also presents evidence that xenon-133 began to vent from Fukushima Daiichi immediately after the quake, and before the tsunami swamped the area. This implies that even without the devastating flood, the earthquake alone was sufficient to cause damage at the plant.

地震の直後にすでに封じ込めが完全でなくなっていた。