It was in fact well over 100mSv/y.

In my previous post it says “The WHO report put the maximum whole-body radiation dose per person in the first four months of the crisis at 50 millisieverts” ….

http://fukushimaappeal.blogspot.co.uk/2012/12/who-downplayed-health-effects-of_27.html

This September, after one year and half, Fukushima government and Tepco finally revealed the radiation level of area near Daiichi Nuclear Power Plant at the time of the accident.  Highest point in Kamihatori area, Futaba-machi (5.6km away from Daiichi nuclear power plant) was 1590uSv per hour (=13,928mSv per year!) at 3pm before 1^st explosion at reactor 1 on March 12, 2012.  The level was so high that being there for 40 minutes would expose you to the annual radiation dosage limit. 

 Another higher point was in Shinzan area、(3.5km away north west from Daiichi) 904uSv/h at 5pm on 12/3/11.

Citizens within 10km radius of Daiichi nuclear power plant were evacuated in early morning on the day but not everybody managed to evacuate before vent was carried out before 9am.(*1)  Mr. Hirose, journalist and been a main figure of anti nuclear campaign in Japan commented in his lecture that we should review evidence of the high radiation level and the evacuation situation.  While central and Fukushima government, Tepco employees, IAEA members and possibly even Radiation Effects Research Foundation (they were there carrying measuring equipment) with protective gears were collecting samples, local people were staying in the shelter without any protections or safety information.  Also residents in Namie-machi and Iidate village weren’t told the danger of the radiation for several months although it was over 100uSv/h (=876mSv/y) in some places.  Although Namie-machi and Iidate village are about 30km away from Daiichi Nuclear Power Plant, unfortunately wind blew towards there and became heavily contaminated area. There was an article “Prometheus’ Trap” – “Men in protective cloth” on Asahi Newspapers written by one of residents in Namie-machi. These men were IAEA members. 

In this article it says that they had men in protective cloth, visiting every day, measuring the level of radiation.  They were told it was safe although the most of the area in the town was well over 100mSv/y in March and April 2011.  

(Reference) http://www.asahi.com/national/update/0922/TKY201209220154.html

Correction more information: (1*) What time  did Tepco vent at reactor 1 before 1st explosion on 12/3/11?   Simplyinfor. org reported 10:09am.  Fukushima diary reported 11am and 4pm.  I found another information which I've been thinking probably right in wikipage.org that reported that Tepco workers started to work at 10:17am but managed to vent successfully at 14.30 by one of experienced worker after difficulties   Later he was taken to a hospital because he was exposed to very high dose of ionized radiation and also felt sick and very tired. 
In recent interview by our planet TV http://www.ourplanet-tv.org/?q=node/1518, Mr. Idogawa, ex Futaba mayor commented that there were children and pregnant women living near the highest dose of ionized radiation were detected in Kamihatori area, Futaba-machi.

Also there must be lots of other citizens who were exposed to high dose of radiation before being evacuated because after several explosions, it was in the afternoon on 15/3/11 when all the residents from homes and hospitals were evacuated out of 20km area radium of Fukushima Daiichi nuclear plant, although an evacuation order was announced at 6.25pm on 12/3/11.  

http://www.sponichi.co.jp/society/news/2011/03/15/kiji/K20110315000436000.html