COOLABILITY OF SEVERELY DEGRADED CANDU CORES
COOLABILITY OF SEVERELY DEGRADED CANDU CORES
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DOI：
10.1615/ichmt.1995.radtransfprocheatmasstransfsevnuclreactacc.240
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
J. Rogers;D. Meneley;C. Blahnik;V. Snell;S. Nijhawan
中科院分区：
文献类型：
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作者：
J. Rogers;D. Meneley;C. Blahnik;V. Snell;S. Nijhawan
分析和实验研究表明，CANDU反应堆中的分离冷却慢化器在发生失水事故(LOCA)并伴随紧急堆芯冷却系统(ECCS)完全失效的情况下提供了有效的散热器。慢化剂散热器防止燃料熔化，并保持燃料通道的完整性，因此在没有严重堆芯损坏的情况下终止了这一严重事故。然而，在这样的事故中，慢化器散热器发生故障的可能性是很小的。罗杰斯(1984)使用简化模型对如此严重的事故所做的开创性工作表明，燃料通道将失效，并在Calandria底部形成一层干燥的固体碎片，它将升温并最终融化。然而，堆芯材料的熔池将保留在Calandria容器中，由独立冷却的屏蔽罐水冷却，最终将重新结晶。因此，只要保持“屏蔽坦克”的完整性，“卡兰德里亚号”本身就是一个“堆芯捕集器”。本文回顾了在严重事故条件下CANDU堆芯损伤的后续工作，并描述了一个基于经验的这一过程的力学模型。结果表明，对于CANDU反应堆中如此严重的事故序列，堆芯解体后的最终状态是由干固体、粗碎屑组成的多孔床，与起爆事件和堆芯解体过程无关。修订后的修订者1996年1月1996年1月1995年7月1995 AECI P2251 Speakman Drive 2251，Rue Speakman 9 Mississaua，Ontario Mississuga(安大略省)
Analytical and experimental studies have shown that the separately cooled moderator in a CANDU reactor provides an effective heat sink in the event of a loss-of-coolant accident (LOCA) accompanied by total failure of the emergency core cooling system (ECCS). The moderator heat sink prevents fuel melting and maintains the integrity of the fuel channels, therefore terminating this severe accident short of severe core damage. Nevertheless, there is a probability, however low, that the moderator heat sink could fail in such an accident. The pioneering work of Rogers (1984) for such a severe accident using simplified models showed that the fuel channels would fail and a bed of dry, solid debris would be formed at the bottom of the calandria which would heat up and eventually melt. 'However, the molten pool of core material would be retained in the calandria vessel, cooled by the independently cooled shield-tank water, and would eventually resolidify. Thus, the calandria vessel would act inherently as a "core-catcher" as long as the'shield tank integrity is maintained. The present paper reviews subsequent work on the damage to a CANDU core under severe accident conditions and describes an empirically based mechanistic model of this process. It is shown that, for such severe accident sequences in a CANDU reactor, the end state following core disassembly consists of a porous bed of dry solid, coarse debris, irrespective of the initiating event and the core disassembly process. Revised Reviser 1996 January 1996 Janvier 1995 July Juillet 1995 AECI P2251 Speakman Drive 2251, rue Speakman 9 Mississauga, Ontario Mississauga (Ontario)