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Titolo:
Simulation study of intentional tritium release experiments in the caissonassembly for tritium safety at the TPL/JAERI
Autore:
Iwai, Y; Hayashi, T; Kobayashi, K; Nishi, M;
Indirizzi:
Japan Atom Energy Res Inst, Dept Fus Engn Res, Tritium Engn Lab, Tokai, Ibaraki 3191195, Japan Japan Atom Energy Res Inst Tokai Ibaraki Japan 3191195 aki 3191195, Japan
Titolo Testata:
FUSION ENGINEERING AND DESIGN
fascicolo: 3-4, volume: 54, anno: 2001,
pagine: 523 - 535
SICI:
0920-3796(2001)54:3-4<523:SSOITR>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
TURBULENCE; BEHAVIOR; MODEL;
Keywords:
Caisson assembly for tritium safety study; Reynolds equation; detritiation system;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Iwai, Y Japan Atom Energy Res Inst, Dept Fus Engn Res, Tritium Engn Lab, Tokai, Ibaraki 3191195, Japan Japan Atom Energy Res Inst Tokai Ibaraki Japan 3191195 195, Japan
Citazione:
Y. Iwai et al., "Simulation study of intentional tritium release experiments in the caissonassembly for tritium safety at the TPL/JAERI", FUSION ENG, 54(3-4), 2001, pp. 523-535

Abstract

At the Tritium Process Laboratory (TPL) in Japan Atomic Energy Research Institute (JAERI), Caisson assembly for tritium safety study (CATS) with 12 m(3) of large airtight vessel (Caisson) was fabricated for confirmation and enhancement of fusion reactor safety to estimate the tritium behavior in the case, where the tritium leak accident should happen. One of the principalobjectives of the present studies is the establishment of simulation method to predict the tritium behavior after the tritium leak accident should happen in a ventilated room. As for the understanding of initial tritium behavior until the tritium concentration become steady, the precise estimation of local flow rate in a room and time-dependent release behavior from the leak point are essential to predict the tritium behavior by simulation code. The three-dimensional eddy flow model considering, tritium-related phenomena was adopted to estimate the local flow rate in the 50 m(3)/h ventilated Caisson. The time-dependent tritium release behavior from the sample container was calculated by residence time distribution function. The calculated tritium concentrations were in good agreement with the experimental observations. The primary removal tritium behavior was also investigated by another code. Tritium gas concentrations decreased logarithmically to the time byventilation. These observations were understandable by the reason that theflow in the ventilated Caisson was regarded as the perfectly mixing flow. The concentrations of tritiated water measured, and indications of tritium concentration by tritium monitors became gradually flat. This phenomena called 'tritium soaking effect' was found to be reasonably explained by considering the contribution of the exhaustion velocity by ventilation system, and the adsorption and desorption reaction rate of tritiated water on the wall material which is SUS 304. The calculated tritium concentrations were in good agreement with the experimental observations. The effectiveness of these codes was thus proved. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/04/20 alle ore 00:07:31