March 24th, 2011 – NRC received nearly all missing radiation data from March 13th – March 15th window

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From: Imboden, Andy –
Sent: Thursday, March 24, 2011 5:17 PM
To: Mazaika, Michael; PMTO1 Hoc; Brown, David
Cc: Harvey, Brad; Quinlan, Kevin; Galletta, Thomas; Harvey, Brad; Brandon, Lou
Subject: RE: Radiation data

Need to keep in mind these data are
a) Taken way too close to ground level (2 meters?)
b) Possibly influenced by buildings/obstructions

The transport over 30 km or whatever it is would have been by winds further aloft. Also, do we know any of the building heights (main admin building)? Would suspect a factor in the winds parallel the shoreline because the reactor buildings parallel the shoreline and are making a canyon at the very close to ground level.

Also, Embassy had a clarifying question during 3d shift last night, they are working on the JMA data request.

Andy Imboden
Chief, Environmental Review Branch

From: Mazaika, Michael
Sent: Thursday, March 24, 2011 11:37 AM
To: PMT01 Hoc; Brown, David
Cc: Harvey, Brad; Quinlan, Kevin; Galletta, Thomas; Imboden, Andy; Harvey, Brad; Brandon, Lou
Subject: FW: Radiation data


Don’t know if any of you have had a chance to look at the e-mails that the Japan Embassy Task Force has been forwarding lately. I selected one before the end of my shift yesterday. It appears that the file labeled as “TEPCO-Rad Data at Plant-March 20.xlsx” includes transcribed wind direction and wind speed for the site.

The data also appear to be associated with the hardcopy mobile sampling summaries that we have been receiving since about last Wed or Thurs.

My initial look was to see if these data contain measurements during the “gap” that was identified – that is (as relayed to me by Kevin):
* specifically – 13 March Hr 19 JST to 14 March Hr 06 JST, and
* generally – 13 March Hr 10 JST to 15 March Hr 02 JST

Except for only a few hours, these Met data entries appear to cover the above time periods. This particular spreadsheet includes radiation monitoring / sampling results and Met data for the period from 11 March to 20 March, 2011.

Pages From C142665-02H –7 TEPCO – Fukushima Daiichi Radiation Data From Missing Gap Period Identified

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