Fukushima Daiichi NPP Unit-2 Suppression Chamber Bottom Earthquake Break and Its Consequence

Fumiya Tanabe

Presentation information

Oral presentation

III. Fission Energy Engineering » 304-1 Thermal Hydraulics, Energy Conversion, Energy Transfer, Energy Storage

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

Wed. Sep 13, 2017 4:05 PM - 5:25 PM Room E (B32 - B3 Block)

Chair:Tadashi Fujii (HGNE)

5:05 PM - 5:20 PM

[1E17] Fukushima Daiichi NPP Unit-2 Suppression Chamber Bottom Earthquake Break and Its Consequence

*Fumiya Tanabe¹ (1. Sociotechnical Systems Safety Research Institute)

Keywords:Fukushima Daiichi NPP accident, unit-2, S/C bottom break, S/C water level, RCIC loss of function

The earthquake on March 11^th should have broken some pipe connected to the lowest part of 1F2 suppression chamber(S/C). The S/C water level decreasing by the leak should have resulted in loss of function of the RCIC on 14^th due to the pump suction line uncovering and subsequently in turbine trip due to the discharge line uncovering to lead to the pressure decreasing.