April 9th, 2011 – Summary of Naval Reactors “Warm” and “Hot” Zones around Fukushima Daiichi

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From:Call, Michel
Sent:Saturday, April 09, 2011 4:09 AM
To:Hay, Michael
Cc:Miller, Marie
Subject:Update – summary for the NR hot zone and warm zone item
Attachments: Summary of Naval Reactors Warm and Hot Zone Dose Assessment.docx

Attached is the discussion text for this item (the last one for PMT’s list). I am still waiting to hear from the HQ PMT for the first item. I am sending an additional question to Will about the zones that I may want to add to the attached text. I can pass that along if/when I do.

Let me know if you have any questions.


Summary of Naval Reactors Warm and Hot Zone Dose Assessment

The military has established a radiological warm zone and hot zone around the Fukushima Daiichi nuclear station. The hot zone extends out to 25 miles from the plant. The warm zone extends out an additional 125 miles from the plant.

The purpose of these zones is to control the dose to military personnel working as part of the humanitarian mission in the areas affected by the March 11th earthquake and tsunami.

There have been some discussions regarding the sizes of the zones and what would be needed to reduce their sizes.

One consideration for looking at the possibility of reducing the zone sizes would be to reduce the dosimetry needs for personnel; personnel entering into these zones are required to have dosimetry.

At this time, the current size of these zones will not be reduced until there is field data to support reduction of the zone footprints.

Currently, there does not appear to be any plan by the U.S. Navy to perform field measurements that could be used to support reduction of the zones’ footprints.
Pages From C142665-02E –3 Summary of Naval Reactors Warm and Hot Zone Dose Assessment

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