Of course they had uncertainty, but I wonder how much of the uncertainty was based on the technology and how much on the politics.
The operator of Japan's wrecked Fukushima nuclear plant knew about record high measurements of a dangerous isotope in groundwater at the plant for five months before telling the country's nuclear watchdog, a regulatory official told Reuters.
Tokyo Electric Power Co (Tepco) said late on Wednesday it detected 5 million becquerels per liter of radioactive strontium-90 in a sample from a groundwater well about 25 meters from the ocean last September. That reading was more than five times the broader all-beta radiation reading taken at the same well two months earlier.
A Tepco spokesman said there was uncertainty about the reliability and accuracy of the September strontium reading, so the utility decided to re-examine the data. [my bolding]
Friday, February 14, 2014
Tepco sat on record high strontium-90 readings
So much for restoring confidence in Tepco's management of the Fukushima cleanup: