As part of emergency precautions being taken at Fukushima Daiichi
Nuclear Power Station, we have been evaluating the internal exposure
dose of each worker*. On May 30th, 2011, we reported that we were
informed the levels of internal radioactivity (iodine 131) present in
thyroids of the two TEPCO male employees are higher than normal.

Subsequently the two TEPCO employees got a medical examination to be
administered by the National Institute of Radiological Sciences
(NIRS: Independent Administrative Corporation). NIRS gave us reports
of Evaluation Exposure Dose limits at the present time. We reported
the present status of determining exposure dose limits to Ministry of
Health, Labour and Welfare.

<Evaluation Exposure Dose limits for two TEPCO employees>
- Mr A, From 210m Sv to 580m Sv
- Mr B, From 200m Sv to 570m Sv

Continuous detailed monitoring of their internal exposure conditions
will be conducted to determine their levels of exposure dosage of each
worker at Fukushima Daiichi Nuclear Power Station.

* Determining exposure dosage levels
This work is comprised of evaluating and adding the exposure dosage
during both working hours and the time spent residing in the
Anti-earthquake Building in addition to internal exposure levels of
the committed dose (exposure spanning a 50-year period from this
juncture).