[3E01-04] Combustion Phenomenon, Concrete Damage

10:15 AM - 10:30 AM JST(1:15 AM - 1:30 AM UTC)

[3E04] Factors of concrete damage in severe accident at Fukushima Daiichi Nuclear Power Plant

*Osamu Kontani¹, Shohei Sawada¹, Shunsuke Ishikawa¹ (1. Kajima Corporation)

Keywords:

severe accident,concrete loss,coarse and fine aggregate,melting and sofening,silicon dioxide

The cause of the disappearance of concrete at the foot of the RPV pedestal during the severe accident at the Fukushima Daiichi Nuclear Power Plant Unit 1 was investigated through a literature review. In addition, high-temperature heating tests of aggregate, which accounts for about 75% of the concrete, were conducted to study the melting and softening behavior of several types of aggregates. As a result, it was found that the melting and softening behavior differed depending on the type of aggregate.