There is nothing on the refuileng floor that would cause such an explosion. I would bet money that the explosion was caused by a hydrogen leak in the turbine building. Large generators are cooled with hydrogen. The turbine building is not built to maintain its function in a earth quake. The upper portion of the reactor building above refuileng floor is just an industrial sheet metal construction and not designed to withstand an explosive pressure wave because it was not required at the time (late 60s). So there has been three abnormal events for which the plant is designed: an earth quake, tsunami, and explosion. The good news is that the fuel is undamaged, the reactor coolant pressure boundary (RCPB) is intact, and the containment building is intact. Therefore, the public is protected.Of course that was the design objective. Looking at the damage that has occurred, it is unlikely that this 439 MWe, 40 year old power plant will be operated again. Most likely it will be replaced with a 1400 MWe ABWR with an advanced containment.

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