Current Air Dose Levels in Different Areas Within #Fukushima I NPP Show Radiation Hazard for Workers

The PDF document that TEPCO released on December 11, 2013 (in Japanese only, so far) also contained information on air dose rates in different areas inside the plant compound, and how TEPCO hopes to reduce the rates for workers who have to work in the cluttered, high-radiation environment.

Areas:

Air dose levels in the above areas (in microsievert/hour), and the radiation mitigation plan:

Area I is the ocean-side (east) of the reactor buildings and turbine buildings (1 - 4). Between the turbine buildings and the open channel of the plant harbor, workers are still injecting waterglass to create in-the-ground impermeable wall to stop the groundwater from leaking into the harbor. Debris in this area is highly contaminated with fallout, and the effect of direct radiation is also significant. It is a high-radiation area (over 100 microsieverts/hour), and unless the debris are removed, the air dose levels there are not going to come down.

Area II-1 is the mountain-side (west) of the reactor buildings (1 - 4), and radiation levels are high. In the far right column "Further mitigation plan", TEPCO writes, "block direct radiation that comes from reactor buildings".

Area III may not be that high in gamma radiation but it is the area where the waste water after reverse osmosis (desalination) leaked, and it has high beta radiation contamination.

Area IV-1 and Area IV-2 are the only two areas with relatively low air dose rates. The anti-seismic building is located in Area IV-2. Area V is where the removed debris is stored.

Clear the debris first, bury them somewhere so that we can work, Mr. Michio Ishikawa of Japan Nuclear Technology Institute said in April 2011. Two years and eight months later, TEPCO's radiation mitigation plan in December 2013 is to clear the debris and sweep the roads.

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Radiation Levels Inside #Fukushima I Nuke Plant Compound Exceed 300 Microsieverts/Hr in Some Locations

TEPCO did the survey of the air radiation levels within the plant compound on May 9, 2012, using the GPS system for the first time. Unbelievable as it is, that's what the company says in the June 2012 report for the Working Group for the Decommissioning of Reactors 1 through 4 at Fukushima I Nuke Plant. The report is only available in Japanese, and it sometimes contains information that is not reported to the media in the regular press conferences.

The following map is on the page 66 of the report, in a section that discusses the various methods of decontamination of the plant compound.

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