A newly revealed document shows the Nuclear Safety Commission backed a claim by utilities in a 1992 report that no safety measures were needed to deal with a long-term complete power loss at nuclear plants, illustrating they minimized risk assessments together.
A text written by Tokyo Electric Power Co. was included in the report to revise safety measures compiled by the commission’s working group, and in the end no steps were introduced to counter the loss of key electricity-run reactor cooling functions.
Loss of power was a main cause of the disaster at the Fukushima No. 1 nuclear plant. Three of its six reactors suffered meltdowns after the plant lost most of its power following the magnitude 9.0 earthquake and tsunami of March 11, 2011
Read the rest of the story: Watchdog let utilities justify omitting nuclear plant power supply safety steps.