In the mid-term administration plan, Tepco decided to send all of their employees to Fukushima for decontamination from 2013.
They are sent to Fukushima for 2~3 times a year, about 100,000 people in total will go to Fukushima annually.
This is not volunteer, this is obligation.
Google translation of an excerpt from the Nikkei report:
Published: October 27th, 2012 at 5:30 pm ET