The Associated Press reported overnight:
A pair of thin robots on treads sent to explore buildings inside Japan’s crippled nuclear reactor came back Monday with disheartening news: Radiation levels are far too high for repair crews to go inside.
The robots reported radioactivity readings of up to 49 millisieverts per hour inside Unit 1 and up to 57 inside Unit 3, levels too high for workers to realistically enter.
How unsafe are these levels? The AP noted:
Japanese authorities more than doubled the legal limit for nuclear workers since the crisis began to 250 millisieverts a year. Workers in the U.S. nuclear industry are allowed an upper limit of 50 millisieverts per year. Doctors say radiation sickness sets in at 1,000 millisieverts….
Have to go back now and see what TEPCO has admitted in light of the 1,000 millisievert threshhold for radiation sickness.