Fukushima-Daiichi Nuclear Power Plant Accident in Japan INFORMATION BULLETIN No.13 (25 March 2011 Update as of 2:00 PM)
Details
The DOST-PNRI continues to closely monitor the situation at the Fukushima-Daiichi Nuclear Power Plant.
With AC power connected, instrumentation continues to be recovered in Units 1, 2, and 4. Workers returned after being evacuated from Units 3 and 4 on March 23, following confirmation that black smoke emissions from Unit 3 had ceased.
According to the IAEA, the overall dose rates reported on-site appeared to be trending downward from 1,930 to 210 microsieverts per hour between 21 to 23 March 2011.
Japanese authorities continue to monitor the level of radioactivity in food and water and the distribution of contaminated food has been restricted/banned for consumption.
Monitoring at 30-km offshore from Fukushima by ships of the Japanese Authorities showed, as of 24 March 2011, that surface seawater concentrations ranged from 24.9 to 76.8 becquerels per liter (Bq/l) of Iodine-131, and 11.2 to 24.1 Bq/l for Cesium-137. The maximum permissible concentrations in water are 40 Bq/l for Iodine-131 and 90 Bq/l for Cesium-137.
There are internationally agreed Codex Guideline Levels (GLs) for radionuclide levels in internationally traded food following a nuclear or radiological emergency. These GLs are published by the Joint Food and Agriculture Organization/World Health Organization Codex Alimentarius Commission. Food with radioactivity levels below these GLs is safe for people to eat. When the GLs are exceeded, national governments must decide whether and under what circumstances the food should be allowed to be distributed within their territory or jurisdiction.
For reporting of nuclear/radiological emergencies, you may contact the Radiological Impact Assessment Section/Nuclear Response Support Center of the PNRI through (632) 929-6011 to 19 local 285 or 311
