Abstract Safety in a nuclear research reactor such as the Tehran Research Reactor (TRR) is a significant concern mainly after the Fukushima nuclear accident and satisfied by a continuous upgrade in the whole reactor facility and its personnel. Happening of total complete of Coolant Accident (LOCA) due to a massive rupture in the TRR primary cooling pipe is conceivable after a severe accident such as an earthquake. This accident could lead to the pool dewatering, and, finally the reactor core uncovering. Consequences of this accident are the fuel blistering, swelling, and melting depending on its severity. In this study we analyze the possibility of passively cooling the TRR reactor core by thermal radiation and conduction to the surrounding structures and natural convection to air in the complete LOCA accident. In this way, the contribution of various heat lost mechanisms are demonstrated.

中文翻译：

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德黑兰研究堆冷却剂完全丧失事故期间燃料温度的调查

摘要 德黑兰研究堆（TRR）等核研究反应堆的安全问题主要是在福岛核事故发生后，并通过整个反应堆设施及其人员的不断升级而得到满足。可以想象，在地震等严重事故后，由于 TRR 主冷却管发生大面积破裂而导致完全冷却剂事故 (LOCA) 的发生。这次事故可能导致水池脱水，最终反应堆堆芯暴露。这次事故的后果是燃料起泡、膨胀和熔化，具体取决于其严重程度。在这项研究中，我们分析了在完全 LOCA 事故中通过热辐射和传导到周围结构以及对空气的自然对流来被动冷却 TRR 反应堆堆芯的可能性。这样，