An Example of thermodynamic approach efforts to estimate concrete damage behavior in 1F Unit 1 pedestal

Ogi, Hiroshi 

Investigations inside Fukushima Dai-ichi Nuclear Power Station (1F) Unit 1 pedestal had revealed the concrete collapsing and the rebar exposure, indicative of the potential for Molten Core Concrete Interaction (MCCI) and the concrete melting under low-temperature conditions. Preliminary thermodynamic assessment using the TAF-ID database developed as OECD/NEA project suggested a solidus temperature of approximately 1050-1100 C for the SiO-based concretes. Assessment of the database through the detailed sim-concrete melting experiments is ongoing.