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首页> 外文期刊>Annals of nuclear energy >Analysis of the cooling capability of steam generators during the loss of residual heat removal system at midloop operation with closed primary system
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Analysis of the cooling capability of steam generators during the loss of residual heat removal system at midloop operation with closed primary system

机译：闭式主系统中环运行时余热排除系统损失期间蒸汽发生器的冷却能力分析

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摘要

Loss of residual heat removal system (RHRS) at midloop operation is one of the most significant core damage risk contributor at low power and shutdown conditions. During this kind of transients the reflux-condensation is one of the cooling mechanisms anticipated in the abnormal procedure of loss of RHRS at midloop level. In this sense, several simulations of loss of the RHRS with closed primary system with the TRACE V4.160 code have been performed considering different availability of steam generators. The present study aims to analyze the thermal-hydraulic behavior after the loss of RHRS at midloop conditions with the reflux-condensation as the only cooling mechanism available and to investigate the capability of this cooling mechanism. The simulation results show that one steam generator is sufficient to remove core decay heat of 11 MW obtaining an equilibrium pressure, but the core uncovery depends on the number of steam generators operating. Finally, an analysis of the abnormal procedure and the event trees of the loss of RHRS sequences at midloop operation has been performed taking into account the results obtained in the simulation with TRACE.
机译：在低功率和停机条件下，中环运行时残留热量去除系统（RHRS）的损失是最严重的核心损坏风险因素之一。在这种瞬态过程中，回流冷凝是中环水平RHRS损失异常过程中预期的冷却机制之一。从这个意义上讲，考虑到蒸汽发生器的不同可用性，已经执行了几种采用TRACE V4.160代码的封闭主系统对RHRS的损失的模拟。本研究旨在分析中环条件下RHRS损失后的热工液压行为，其中以回流冷凝为唯一可用的冷却机理，并研究这种冷却机理的能力。仿真结果表明，一台蒸汽发生器足以去除11 MW的堆芯衰减热，从而获得平衡压力，但是堆芯的发现取决于运行的蒸汽发生器的数量。最后，考虑到在TRACE模拟中获得的结果，对中环操作时RHRS序列丢失的异常过程和事件树进行了分析。

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