Dose levels in the vicinity
μSv/h
What was this facility originally used for?
This facility was originally used to monitor and operate the reactors and turbines, and also control radiation.
It is currently not in use.
How high were radiation levels at the time of the accident?
Six workers were confirmed to have been exposed to more than 250mSv, which is the dose limit for workers responding to
an emergency.
All of these workers were either operators monitoring instruments or electricians/instrument system engineers in the
main control room.
The average annual dose at the Fukushima Daiichi NPS before the accident was 1.4mSv/yr (FY2009).