2022 Fall Meeting

Presentation information

Oral presentation

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

[3L01-04] Fukushima NPPs Accident

Fri. Sep 9, 2022 9:30 AM - 10:35 AM Room L (E1 Bildg.4F No.44)

Chair:Hiroyuki Yoshida(JAEA)

9:45 AM - 10:00 AM

[3L02] In-Vessel Phase MAAP Analysis Based on the Latest Findings on Fukushima Daiichi Nuclear Power Station in the JFY 2021

(2) Unit 3 Analysis Results and Use for Future Studies

*Takuya Yamashita1, Ikken Sato1, Shinji Yoshikawa1, Michal Cibula2, Shinya Mizokami2 (1. Japan Atomic Energy Agency, 2. Tokyo Electric Power Company Holdings, Inc.)

Keywords:severe accident of a nuclear reactor, decommissioning of Fukushima-Daiichi NPP, MAAP, Unit 3, lower plenum debris

MAAP analysis was carried out based on the latest knowledge obtained through the 1F plant internal survey, plant data analysis, and computer model simulations. This study provides best-estimate evaluations for the Units 2 and 3 covering the core melting, core material relocation to the lower plenum, and relocated debris cooling behavior in the lower plenum. The fuel temperature history and the metal oxidation behavior during this period are provided, as well as the estimated composition of the materials relocated to the lower plenum. In this part, the evaluated results for the Unit 3 are presented.