The following are a few choice quotes from the most recent and lengthy IAEA Briefing on Fukushima Nuclear Accident from April 26, 2011, 18:00 UTC. By all means take a look at the entire briefing. It has sections on just about everything you would want to know. I’m only going to reproduce small parts from the sections on the plant and radiation.
On 25 April the power supply for the temporary electrical pumps that supply water to the reactor pressure vessel of Units 1, 2 and 3 was switched from the off-site power supply to temporary diesel generators to allow work to enhance the off-site supply.
White smoke continues to be emitted from Units 2, 3 and 4.
In Unit 1 fresh water is being continuously injected into the reactor pressure vessel through the feedwater line at an indicated flow rate of 6 m3/h using a temporary electric pump with off-site power.
In Unit 2 and Unit 3 fresh water is being continuously injected into the reactor pressure vessel through the fire extinguisher line at an indicated rate of 7 m3/h using temporary electric pumps with off-site power.
In Unit 4 140 tonnes of fresh water was sprayed over the spent fuel pool on 23 April and 165 tonnes of fresh water was sprayed over the spent fuel pool on 24 April using a concrete pump truck. The nuclear emergency response headquarters reported that temperature measurements showed the spent fuel pool temperature to be 83 °C before spraying and 66 °C after spraying on 23 April, and the spent fuel pool temperature to be 86 °C before spraying and 81 °C after spraying on 24 April.
Nitrogen gas is being injected into the containment vessel in Unit 1 to reduce the possibility of hydrogen combustion in the containment vessel. The pressure in the reactor pressure vessel is increasing.
There is more in this section in the link above.
2. Radiation monitoring
For the period 21-25 April deposition of I-131 was detected in eight prefectures, ranging from 2.2 to 37 Bq/m2. Deposition of Cs-137 was detected in 11 prefectures, the values reported ranging from 1.3 to 69 Bq/m2.
Gamma dose rates are measured daily in all 47 prefectures. For Fukushima prefecture gamma dose rates decreased from 1.9 μSv/h on 21 April to 1.7 μSv/h on 23 April. In Ibaraki prefecture, gamma dose rates were 0.12 μSv/h. In all other prefectures, reported gamma dose rates were below 0.1 μSv/h with similar decreasing trends.
Gamma dose rates reported specifically for the eastern part of Fukushima prefecture, for distances beyond 30 km from Fukushima Dai-ichi, showed a similar general decreasing tendency, ranging from 0.1 to 19.4 μSv/h on 25 April. The latest maximum reported value for 20 April was 24 μSv/h.
The other 45 prefectures presented gamma dose rates of below 0.1 μSv/h, falling within the local natural background range.
In drinking water, I-131 or Cs-137 is detectable, but in only a few prefectures. As of 1 April, the one remaining restriction on the consumption of drinking water relating to I-131 (at a level of 100 Bq/L) applies to only one village in the Fukushima prefecture, and the restriction applies only to infants.
It was enjoyable to read the number of times the words “decreased” or “falling” were used.
I came across this website that was posted by Noriyuki Shikata, the Deputy Cabinet Secretary for Public Relations, Director of Global Communications at Prime Minister’s Office of Japan. Tasukeai Japan –3.11 Disaster Relief Information Portal in English. This website seems to mirror my own, but have far more information and is probably a bit better in terms of organization. It lists resources for information, volunteer opportunities, and different opportunities to donate. Definitely check it out.