基于一体化快堆的居里点式非能动停堆装置的关键参数范围研究  

Study on Key Parameter Range for Curie Point Passive Shutdown Device Based on Integrated Fast Reactor

作　　者：李新宇 张熙司[1] 薛方元 刘一哲[1] LI Xinyu;ZHANG Xisi;XUE Fangyuan;LIU Yizhe(Department of Nuclear Engineering Design,China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]中国原子能科学研究院核工程设计研究所,北京102413

出　　处：《原子能科学技术》2025年第S1期80-88,共9页Atomic Energy Science and Technology

基　　金：中核集团集中研发项目。

摘　　要：居里点式非能动停堆装置是一种能够通过堆芯出口冷却剂温度升高触发非能动停堆的安全设备,可以应对多种无保护事故,能够保护一体化快堆的安全。本文对装置动作流程进行分析,确定影响非能动停堆装置对无保护事故缓解效果的关键参数,包括居里温度下限、响应时间、落棒时间和停堆棒价值。为确保停堆棒不误掉落,使用计算流体动力学软件计算正常运行工况下位于堆芯出口区域的温度敏感合金温度以确定居里温度下限;为确保无保护事故发生时停堆棒及时下落,使用事故分析程序计算能缓解事故后果的最长响应时间并确定对应居里温度上限。最终确定居里温度下限为576.5℃,居里温度上限为606.3℃。研究表明,现有温度敏感合金材料在该温度区间内的磁通量变化情况能够满足要求,该关键参数范围是合理的,可用以指导后续装置设计。Passive shutdown procedures can be initiated by the Curie point passive shutdown device,which is a sophisticated reactor safety mechanism that augments the coolant temperature at the core outlet to ensure safety.With this innovative approach,unprotected accidents can be effectively addressed,ensuring the robustness and safety of integrated fast reactor.Enhancing the overall safety and operational stability of the reactor system is the primary objective of this device.To gain a clearer understanding of the pivotal parameters that influence the efficacy of the Curie point passive shutdown device in mitigating the consequences of unprotected accidents,a meticulous analysis of the power plant’s operational procedures was undertaken.The thorough examination covered multiple vital aspects,such as establishing the lower threshold for Curie temperature,evaluating response time,measuring fall time of control rods,and assessing the reactivity worth of the stop rod.In order to ensure timely and effective reactor shutdown,these parameters were essential in the non-dynamic shutdown process and played a crucial role.In this paper,a advanced computational fluid dynamics(CFD)software was used to ensured that unintentional rod ejection during routine reactor operations was avoided.By using this sophisticated tool,the temperature of temperature-sensitive alloys located in the core outlet region could accurately calculated,thereby determining the precise lower boundary for Curie temperature.Furthermore,an accident analysis program was employed to ascertain the maximum allowable response time required for rod dropping in the event of an unprotected accident,which in turn facilitated the establishment of a corresponding upper limit for Curie temperature.Following an exhaustive investigation,it was unequivocally confirmed that temperature-sensitive alloy materials exhibit favorable magnetic flux variations within the prescribed temperature range.This significant finding underscores the practical feasibility and dependability of the

关 键 词：非能动停堆 无保护事故 金属燃料 计算流体动力学 

分 类 号：TL364.2[核科学技术—核技术及应用]