The Tokyo Electric Power Company (TEPCO) said Saturday that the radiation level inside the Fukushima Dai-Ichi nuclear reactor 1 have dropped that will enable workers to reenter the building and make the necessary repairs.
The nuclear operator said the decrease in the level was due to a ventilator that was installed in the building on Thursday to filter out the radioactive materials from the air. However, there was no mention what the numerical values are, in a report by the Kyodo News.
The attached YouTube video shows for the first time pictures of the nuclear employees working on site since the triple disasters happened on 11 March. The teams spend only ten minutes at a time inside the reactor due to the danger of working inside the plant.
About 800 nuclear workers have been working for more than a month to repair the damaged plant, TEPCO said. They have only recently been subjected to medical check ups.
In a 2 April report, a physician who saw the employees said that in addition to exposure to harmful rays, they are suffering from numerous health risks such as depression, nutritional and psychological problems.
Kyodo News reported that 30 workers have been cumulatively exposed to 100 millisieverts.
Details of this report here.