[1E13-17] Severe Accident of Fukushima Daiichi 2

[1E16] Assessment of Core Status of TEPCO's Fukushima Daiichi Nuclear Power Plants

(98)Discussion in the accident progression behavior in the early stage of the Unit 1 accident based on dose rate data

*Daisuke YAMAUCHI¹, Hiroshi SHIRAI², Tami MUKOUHARA², Masaki SAKAMOTO², Yuki KIMURA², Takeshi HONDA¹, Kenichiro NOZAKI¹, Masato MIZOKAMI¹, Shinya MIZOKAMI¹ (1. Tokyo Electric Power Company Holdings, Inc., 2. TEPCO Systems Corporation)

Keywords:Fukushima Daiichi NPS accident, Dose rate data, Accident progression

Dose rate data inside and outside the site was measured by a monitering car in the site and monitering posts around the site during the Fukushima Daiichi NPS accident. Focusing attention on direct and Sky-shine radiation from radioactive materials released to the reactor building and Cloud-shine radiation from radioactive cloud released from the building, based on the measured dose rate data, the accident progression behavior in the early stage of the Unit-1 accident was discussed.