Results 11 to 20 of about 10,669 (261)

Study on relocation behavior of debris bed by improved bottom gas-injection experimental method

Nuclear Engineering and Technology, 2021
During the core disruptive accident (CDA) of sodium-cooled fast reactor (SFR), the molten fuel and steel are solidified into debris particles, which form debris bed in the lower plenum.
Chunming Teng, Bin Zhang, Jianqiang Shan
doaj   +1 more source

Development of a numerical simulation method for air cooling of fuel debris by JUPITER

Mechanical Engineering Journal, 2023
A detailed evaluation for air cooling of fuel debris in actual reactors will be essential in fuel debris retrieval under dry conditions. To understand the heat transfer in and around fuel debris, which is assumed as a porous medium in the primary ...
Susumu YAMASHITA, Shinichiro UESAWA, Ayako ONO, Hiroyuki YOSHIDA   +3 more
doaj   +1 more source

Study on blockage after downward discharge of the molten metallic fuel with radiographic visualization

Nuclear Engineering and Technology, 2022
The downward discharge of the molten fuel to the lower structure of the fuel assembly could increase of the pressure drop and degrade of coolability of the assembly.
Min Ho Lee, Dong Wook Jerng, In Cheol Bang   +2 more
doaj   +1 more source

The key role of sample analysis in Fukushima Dai-Ichi decommissioning, debris management, and accident progression investigation

Frontiers in Nuclear Engineering, 2023
This review is an up-to-date report of the analysis of U-bearing samples from the Fukushima Daiichi Nuclear Power Station (1F). It summarizes the experience gained after previous severe nuclear accidents in the field of fuel debris analysis and the ...
Bella Zubekhina, Anton Pshenichnikov, Yuji Nagae, Masaki Kurata, Masaki Kurata   +4 more
doaj   +1 more source

Gamma detector response simulation inside the pedestal of Fukushima Daiichi Nuclear Power Station

Mechanical Engineering Journal, 2020
Prediction of the fuel debris location and distribution inside the primary containment vessel (PCV) of the Fukushima Daiichi Nuclear Power Station is important to decide further decommissioning step and strategy.
Eka Sapta RIYANA, Keisuke OKUMURA, Kenichi TERASHIMA, Taichi MATSUMURA, Masahiro SAKAMOTO   +4 more
doaj   +1 more source

Validation of free-convective heat transfer analysis with JUPITER to evaluate air-cooling performance of fuel debris in dry method

Mechanical Engineering Journal, 2018
A dry method is one of fuel debris retrieval methods for decommissioning of TEPCO’s Fukushima Daiichi nuclear power station. However, the cooling of fuel debris must be fully maintained without water.
Shinichiro UESAWA, Susumu YAMASHITA, Mitsuhiko SHIBATA, Hiroyuki YOSHIDA   +3 more
doaj   +1 more source

Actinides and fission products in reactor graphite after loss-of-flow accident

npj Materials Degradation, 2022
Samples of irradiated graphite from a uranium-graphite reactor contaminated with fuel debris from loss-of-flow accidents, are investigated. Peculiarities of spatial distribution, speciation, and kinetics of leaching by aqueous solution of actinides and ...
Alexander O. Pavlyuk, Sergei G. Kotlyarevskii, Roman I. Kan, Anna G. Volkova, Vasiliy O. Yapaskurt, Elena V. Zakharova, Andrei A. Shiryaev   +6 more
doaj   +1 more source

Detection of Gadolinium in Surrogate Nuclear Fuel Debris Using Fiber-Optic Laser-Induced Breakdown Spectroscopy under Gamma Irradiation

Applied Sciences, 2020
Fiber-optic laser-induced breakdown spectroscopy (FO-LIBS) was applied to a qualitative and quantitative analysis of gadolinium (Gd) in mixed oxide samples, simulating nuclear fuel debris in the damaged reactors of the Fukushima Daiichi Nuclear Power ...
Ryuzo Nakanishi, Morihisa Saeki, Ikuo Wakaida, Hironori Ohba   +3 more
doaj   +1 more source

Alteration of fuel debris simulants by Bacillus subtilis

Journal of Nuclear Science and Technology, 2023
This study aims to reveal the potential bacterial alteration of nuclear fuel debris. A melt simulant composed of U0.5Zr0.5O2 and Fe(0), and three powder simulants (UO2, Fe(0), and their mixed powder) were prepared and exposed to Bacillus subtilis in a Fe-deficient medium under aerobic conditions. B. subtilis could not dissolve Zr from the melt simulant
Jiang Liu, Yuma Dotsuta, Toru Kitagaki, Noboru Aoyagi, Huiyang Mei, Masahide Takano, Naofumi Kozai   +6 more
openaire   +1 more source

Review of Studies on Joint Recovery of Macroalgae and Marine Debris by Hydrothermal Liquefaction

Applied Sciences, 2022
At the moment, macroalgae blooms in sea waters, the rotting of which causes greenhouse gas emissions and contributes to the formation of a negative ecological and economic situation in coastal zones, which has become a serious problem.
Yuliya Kulikova, Stanislav Sukhikh, Svetlana Ivanova, Olga Babich, Natalia Sliusar   +4 more
doaj   +1 more source