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首頁> 外文會議>International topical meeting on nuclear reactor thermal hydraulics >A Visual Study of Molten Metal Fuel Coolant Interactions under an Initial Phase of SFR Severe Accident using Gallium Metal vs Water or R123
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A Visual Study of Molten Metal Fuel Coolant Interactions under an Initial Phase of SFR Severe Accident using Gallium Metal vs Water or R123

機(jī)譯：使用金屬鎵與水或R123的SFR嚴(yán)重事故初期熔融金屬燃料冷卻劑相互作用的可視化研究

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In hypothetical core disruptive accident (HCDA) of a sodium-cooled fast reactor (SFR) as a severe accident, the possibility of the severe recriticality event would increase if the molten fuel forms tight blockages within the subchannel. However, the metal fuel is known to have lower potential to reach up the HCDA compared to oxide fuel. Because of particular characteristics of the metal fuel, it can be upward dispersed without blockage even in the case of pin failures. This fuel transport introduces a substantial negative reactivity, producing a shutdown effect. Therefore, it is required to verify upward dispersion of the molten metal fuel leading to the negative reactivity feedback. There are various injection conditions of the melt with radial core positions, so it is necessary to identify whether the molten fuel is dispersed well enough with structural conditions, coolant void conditions, and the boiling conditions. In the present study, a series of experiments were conducted to clarify the fundamental behavior of the melt injected into the subchannel. Molten gallium was selected as simulant material for the metal fuel. For simulant materials of the coolant, water and R123 were used. The behavior of the molten gallium in the coolant channel was observed using a high-speed camera and visually analyzed. As a result, the driving force to move upward the melt was observed with the coolant channel conditions.
機(jī)譯：在鈉冷卻快堆（SFR）的假設(shè)堆芯破壞性事故（HCDA）為嚴(yán)重事故的情況下，如果熔融燃料在子通道內(nèi)形成緊密的堵塞物，則發(fā)生嚴(yán)重的重臨界事件的可能性將會增加。然而，已知金屬燃料與氧化物燃料相比具有較低的達(dá)到HCDA的潛力。由于金屬燃料的特殊特性，即使在發(fā)生銷釘故障的情況下，它也可以向上分散而不會堵塞。這種燃料傳輸會產(chǎn)生大量的負(fù)反應(yīng)性，從而產(chǎn)生停工效應(yīng)。因此，需要驗(yàn)證導(dǎo)致負(fù)反應(yīng)性反饋的熔融金屬燃料的向上分散。存在具有徑向芯位置的熔體的各種注入條件，因此有必要確定熔融燃料是否在結(jié)構(gòu)條件，冷卻劑空隙條件和沸騰條件下充分分散。在本研究中，進(jìn)行了一系列實(shí)驗(yàn)以闡明注入子通道的熔體的基本行為。選擇熔融鎵作為金屬燃料的模擬材料。對于冷卻劑的模擬材料，使用水和R123。使用高速相機(jī)觀察冷卻液通道中熔融鎵的行為，并進(jìn)行目視分析。結(jié)果，在冷卻劑通道條件下觀察到使熔體向上移動的驅(qū)動力。

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