Japan’s Nuclear Safety Commission stated it would be impossible to restart the units at Tsruga nuclear plant. Multiple fault lines run under or near the plant with evidence they have acted together in the past. This raised the earthquake risks at the plant beyond the safety margins allowed to operate. It is very unlikely the reactors at Tsruga will ever be restarted.
This week NISA raised the ground motion projections for Kashiwazaki-Kariwa nuclear plant. These new ground motion projections use multiple faults acting at once where TEPCO’s previous assumptions only used one fault line. TEPCO says they will add reinforcement as needed to the plant and intend to restart the reactors. There has been no word yet if NISA considered the risk at Kashiwazaki-Kariwa to be as severe as Tsruga or not.
It was also discovered that there were historical tsunamis in the area near Kashiwazaki-Kariwa that could indicate large tsunami risk at the plant than previously assumed.
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