FEMAXI-III :A computer code for the analysis of thermal and mechanical behavior of fuel rods

; Ichikawa, Michio; *; *; *; *; *; *

JAERI 1298, 90 Pages, 1985/12

JAERI-1298.pdf:3.59MB

no abstracts in English

Investigation of in-reactor cesium chemical behavior in TEPCO's Fukushima Daiichi Nuclear Power Station accident, 1; Cesium chemistry team formation and research plan

Mizokami, Shinya; Osaka, Masahiko; Ito, Kenichi*; Karasawa, Hidetoshi*; Honda, Takeshi*

no journal, , 

Overview of the activity conducted in the project (Upgrading level of grasping state inside reactor) by cesium chemistry team will be introduced as a start point of the series presentation.

Investigation of in-reactor cesium chemical behavior in TEPCO's Fukushima Daiichi Nuclear Power Station accident, 10; Phenomenological generation mechanisms of spherical cesium bearing particle

Ito, Kenichi*; Suzuki, Akihiro*; Oishi, Yuji*; Nakamori, Fumihiro*; Hikida, Shiro*; Nozaki, Kenichiro*; Honda, Takeshi*; Mizokami, Shinya

no journal, , 

The spherical cesium bearing particles (insoluble Cs particles), which were found in Fukushima and Tokyo area, are considered to be formed in RPV of Fukushima Daiichi NPS unit2 because of its composition and microstructural characteristic that needs quench from high temperature.

Investigation of in-reactor cesium chemical behavior in TEPCO's Fukushima Daiichi Nuclear Power Station accident, 12; Analysis of nuclides in samples collected from primary containment vessel of Unit 1

Morishita, Kazuki; Onishi, Takashi; Maeda, Koji; Mizokami, Masato*; Ito, Kenichi*; Mizokami, Shinya*

no journal, , 

no abstracts in English

Analysis results on samples obtained inside PCV and relatively high dose materials in Fukushima Daiichi unit 1 to 3

Mizokami, Masato*; Suzuki, Akihiro*; Maeda, Koji; Ito, Kenichi*; Sato, Ikken; Mizokami, Shinya*

no journal, , 

Some radioactive material samples were taken inside the PCV of Fukushima Daiichi Units 1-3. TEPCO is working for sample collection, transport, and detailed examinations at hot cells using SEM, TEM and ICP-MS. Uranium-bearing micro-particles were analysed using SEM and Emit was confirmed that particles derived from fuel can be categorized into two groups. One is believed to have been separated from hot corium by hydrodynamic processes, while the other showed characteristics suggesting evaporation from hot corium and condensation afterward. The former particles might have compositional features common to the major part of fuel debris. Both groups possibly cause alpha contamination (actinide behavior) in the reactor building.

Analysis of samples collected in PCV interior of Fukushima Daiichi NPP, 6; Use of analysis results of collected samples toward fuel debris retrieval

Kurata, Masaki; Madokoro, Hiroshi; Okumura, Keisuke; Sato, Ikken; Mizokami, Masato*; Ito, Kenichi*; Mizokami, Shinya*

no journal, , 

Based on the analysis of the samples collected in the PCV interior of Fukushima Daiichi NPP, potential issues regarding the fuel debris retrieval are summarized. The analytical targets, analytical method and obtainable knowledge that are necessary to evaluate each issue are discussed. Valuable information can be obtained even from small samples to understand the current situation of the plant and the accident progression. Although the amount of collectable samples is limited, we considered how to evaluate the whole fuel debris and how to utilize the analytical results for recriticality, burnup and safety issues.