Recent content by Sorai

It seems the robot got stuck a few hours after going into Unit 1: "The robot entered the containment vessel through piping on April 10 at 9:30 a.m. It began its journey around the netted first floor of the vessel at 11:20 a.m. to measure the temperature and radiation levels while transmitting...

Yesterday the NRA released the latest map from the airborne monitoring survey: http://radioactivity.nsr.go.jp/ja/contents/11000/10349/24/150213_9th_air.pdf It covers an 80 km radius from the plant, the values represent dose rates at 1m height, decay corrected to Nov 7, 2014. There would be an...

I don't think residents are supposed to commute and work regularly in those areas, at least on paper. You can read a definition of the three zones in this document from December 2011: http://www.meti.go.jp/english/earthquake/nuclear/roadmap/pdf/20111226_01.pdf In relation to areas between 20...

This is a list of food samples tested during August in Koriyama City, which is around 30-40 miles west of the Fukushima NPP. The samples themselves are mostly from Koriyama City, but there are others from other areas within Fukushima Prefecture, some from other Japanese Prefectures and a few for...

After scrolling through the document I see an overwhelming majority of non detections, with detection limits between 20 and 30 Bq/Kg for the most part, that is.

Probably medical waste. Iodine-131 is detected regularly in sewage sludge. Here is a paper with the concentrations detected in Tokyo between 1983 and 1994: https://www.jstage.jst.go.jp/article/jhps1966/33/2/33_2_163/_pdf The main text is in Japanese, but the abstract and a table with the...

Here you have Tepco's data on fuel consumption and purchase: There seems to be a general increase for Fuel Oil (+78%), Crude Oil (+54%), LNG (+17%) and Coal (+7%) compared to the previous fiscal year. But Kanto, region where Tepco operates, had less dependence on nuclear generation compared...

This one: http://www.tepco.co.jp/cc/press/betu11_j/images/111202g.pdf Seems to be the same info. They couldn't confirm whether or not the rupture disk was open:

We can use the data of dust monitoring from Fukushima City, but I do not know where the sampling point (Sugitsuma town) is located in relation with the fallout sampling point: Readings of dust sampling (June 1, 2011 - January 19, 2012) Radioactivity Concentration (Bq/m^3) Cs-134 Cs-137...

The ones that have been translated are here: http://radioactivity.mext.go.jp/en/monitoring_around_FukushimaNPP_MEXT_DOE_airborne_monitoring/ And then there is this one, but it's in Japanese: http://ramap.jaea.go.jp/map/map.html

Did they ever claim that there was a criticality or they just said that they couldn't discard the possibility? I know we already have the tendency to eliminate all the qualifiers from the Japanese reports, but it seems in this case both Tepco and NISA meant it when they said that "the...

Yes, that was my question. But it seems they are just reporting total releases without conversion. Cs-134 and Cs-137, according to the new version of the roadmap: http://www.tepco.co.jp/en/press/corp-com/release/betu11_e/images/111017e3.pdf [page 14]

Is this measured in I-131 equivalents or just directly cesium releases without any conversion? Sorry if this has been asked before.

The sample comes from dirt accumulated near a drain on the roof of a building. Using NSC's conversion factor for soil samples would not be accurate in this case. Actually you would have to divide by the total square meters of the roof and try to take into account how effective the drain was to...

http://www.nrc.gov/reading-rm/foia/japan-foia-info.html