Have any new measures been taken to protect the Fukushima site against future tsunamis?

In order to protect the buildings against future tsunamis, Tokyo Electric Power Holdings, Inc. (TEPCO) started building an L-shaped concrete wall on top of the outer quay wall in September 2019, increasing its height by 11 metres. The wall will be 600 m long and will be completed by the end of the 3rd quarter of 2020. Initially, a provisional barrier 2.4 to 4.2 m in height was erected. In addition, specific measures were taken to protect the individual reactor buildings against the ingress of water.

In order to prevent the Mega-Float, an engineless barge that stores water, from breaking away from the quay wall and causing damage to the premises, it was to be transferred to the cooling-water inlet pool for Units 1 to 4 and moored there. In May 2019, the Mega-Float was moved there for initial cleaning of the ballast water and decontamination. At the open end of the cooling-water inlet pool towards the sea, a grounding mound will be created so that the Mega-Float can be grounded in front of the groundwater barrier structure and anchored there. According to current planning, the work should be completed by the 3rd quarter of 2020.