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JAEA Reports

Sodium Combustion Analysis for the Deatail Design of Prototype Fast Breeder Reactor MONJU

Okabe, Ayao; Onuki, Koji; Kikuchi, H.; M.Uchihashi; Nishibayashi, Yohei; Ikeda, Makinori; Miyake, Osamu

JNC TN2400 2003-005, 62 Pages, 2004/03


Sodium combustion analyses were performed using ASSCOPS version 2.1 in order to obtain background data for evaluating validity of the mitigation system against secondary sodium leak of MONJU. The analytical results of floor temperature and hydrogen concentration were summarized in this report.In the sodium combustion analyses under the detailed design conditions, it was confirmed that the temperature rise of the floor liner was reduced In addition, as for the hydrogen concentration in sodium leak process which is formed by the reaction of sodium and moisture, it was confirmed that it is restricted under 4% of the hydrogen burn criterion. Concerning the hydrogen concentration due to the reaction with sodium and sodium hydroxide in the sodium pool after the storing, in the same way, it was confirmed that it is restricted under 4% of the criterion.

JAEA Reports

Evaluation of mechanical integrity of floor liner in secondary heat transport system cells of Monju

Imo, Kazumichi; Onuki, Koji; Kikuchi, H.; Morishita, Masaki; Igawa, Kenichi*; Nishibayashi, Yohei; Ikeda, Makinori

JNC TN2400 2003-004, 78 Pages, 2004/03


About the secondary system floor liner of Monju, the mechanical soundness of a floor liner to the thermal load conditions by combustion of leak sodium was evaluated by large displacement inelastic analysis and the partial structure model test.In large displacement inelastic analysis, it was confirmed that heat strain of a floor liner was less than the standard value of the strain for no through-wall crack. In addition, the influence evaluation by a temperature increasing rate, liner board thickness, and the existence of corrosion thinning was performed. The result, the influence on the maximum strain was small in any parameter.In the partial structure model test, even when a strain more excessive than the standard value of strain was given, it was confirmed no through-wall crack in a liner plate.In addition, this report improves the evaluation conditions of the conventional research report [1], and resummarizes them to detailed design evaluation.

Oral presentation

Equipments integrity confirmation of fast breeder prototype reactor MONJU, 6; Function test of integrated sodium leak monitoring system

Nishibayashi, Yohei; Matsuno, Hiroki; Hatori, Masakazu

no journal, , 

The cell monitor to detect it at the early stage of the sodium leakage to an integrated leakage monitoring system and overseas heat insulation that consolidated information related to the sodium leakage to offer information on the situation of the site to the driving member in the central control room promptly when the sodium of the coolant leaked, and to support the judgement and displayed it was set up. In the check test such as integrated leakage monitoring systems, the function of this monitoring system and the cell monitor was confirmed.

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