“Fukushima exposed a flaw in the safety of nuclear power plants. But it is a flaw that is easily fixed without new reactors (that may bring their own new set of issues with them).”
Fukushima’s flaw was the diesel tanks that provided fuel for the generators were located outside the buildings walls. When the flood came it washed away the tanks. Basic design flaw. A protection wall around the tanks would have prevented the entire episode at that facility.
No, there was significantly more damage and problems than just the fuel tanks.
https://www.nirs.org/fukushima/naiic_report.pdf
page 12
The tsunami caused by the earthquake flooded and totally destroyed the emergency diesel generators, the seawater cooling pumps, the electric wiring system and the DC power supply for Units 1, 2 and 4, resulting in loss of all power—except for an external supply to Unit 6 from an air-cooled emergency diesel generator. In short, Units 1, 2 and 4 lost all power; Unit 3 lost all AC power, and later lost DC before dawn of March 13, 2012. Unit 5 lost all AC power.
The tsunami did not damage only the power supply. The tsunami also destroyed or washed away vehicles, heavy machinery, oil tanks, and gravel. It destroyed buildings, equipment installations and other machinery. Seawater from the tsunami inundated the entire building area and even reached the extremely high pressure operating sections of Units 3 and 4, and a supplemental operation common facility (Common Pool Building).