2019 Fall Meeting

Presentation information

Oral presentation

IV. Nuclear Plant Technologies » 402-1 Nuclear Safety Engineering (Safety Design, Safety Assessment/Analysis, Management)

[1G01-02] Fukushima Daiichi NPP Accident

Wed. Sep 11, 2019 10:00 AM - 10:35 AM Room G (Common Education Bildg. 2F C22)

Chair:Masashi Himi(AdVanceSoft)

10:15 AM - 10:30 AM

[1G02] Discussion of Containment Depressurization Scenario of Fukushima Daiichi Unit-2 during March 15th Morning

*Seiichi Dono1, Kenichiro Nozaki2, Takeshi Honda1, Masato Mizokami1, Daisuke Yamauchi1, Shinya Mizokami1 (1. TEPCO HD, 2. TEPCO SYSTEMS CORPORATION)

Keywords:Fukushima Daiichi, Unit 2, Accident progression, Gas leakage, Condensation, Thermal stratification

The D/W pressure at Fukushima Daiichi Nuclear Power Station Unit-2 dropped from 0.73 MPa [abs] to 0.155MPa [abs] between 7:20 and 11:20 on the March 15th, 2011. We assumed gas leakage from the PCV and steam condensation in the PCV as factors of this depressurization, and examined the feasibility of the accident progression scenario based on the observation facts obtained from the site.