[1A15-20] 1F fuel debris 2

4:35 PM - 4:50 PM JST(7:35 AM - 7:50 AM UTC)

[1A16] Analysis of fuel debris obtained from inside the pedestal of Unit 2 of Fukushima Daiichi Nuclear Power Station(16) Alkaline fusion treatment and elemental and radioactivity analyses of fuel debris from the second trial retrieval

*Irvin Mardongan Banjarnahor¹, Satoshi Nakamura¹, Yoshihiro Kitatsuji¹, Toru Kitagaki¹, Masato Mizokami², Shinya Mizokami² (1. Japan Atomic Energy Agency, 2. TEPCO HD)

Keywords:

Fukushima Daiichi Nuclear Power Station accident,Fuel debris,Solution analysis,Alkaline fusion,Elemental analysis,Radioactive analysis

Analysis of fuel debris samples retrieved from the pedestal region of Fukushima Daiichi NPS (1F) Unit 2 is important for understanding fuel debris characteristics and accident progression. In this study, a fuel debris sample from the second trial retrieval was completely dissolved by sodium peroxide alkaline fusion, and the resulting solution was analyzed via ICP-AES for elemental composition and via alpha- and gamma-ray spectrometry for radionuclide composition. The result was compared with that obtained from the first trial retrieval sample to clarify similarities and differences in bulk elemental and radionuclide compositions. This work aims to provide basic data for evaluating the heterogeneity of fuel debris in the pedestal region and for integrated characterization together with solid-state analytical results.