铅铋次临界堆XADS束流超功率事故研究  

Accident of lead-bismuth subcritical reactor XADS

作　　者：张玲 辜峙钘 戴嘉宁 欧文澜 潘麒文 龚政宇 张牧昊 ZHANG Ling;GU Zhixing;DAI Jianing;OU Wenlan;PAN Qiwen;GONG Zhengyu;ZHANG Muhao(College of Nuclear Technology and Automation Engineering,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]成都理工大学核技术与自动化工程学院,成都610059

出　　处：《核技术》2022年第10期85-90,共6页Nuclear Techniques

基　　金：国家自然科学基金(No.12005025);四川省自然科学基金(No.2022NSFSC0253)资助。

摘　　要：加速器驱动次临界系统(Accelerator Driven sub-critical System,ADS)利用加速器产生的高能强流质子束轰击重金属靶核,产生散裂中子作为外源中子来驱动和维持反应堆自身运行。质子束流的不稳定性将对此类反应堆的功率水平产生影响,进而威胁ADS的安全。加速器束流超功率是ADS系统的一种典型事故瞬态,该事故导致ADS堆芯功率骤然上升,堆芯温度骤升,可能超过材料的安全限值,威胁反应堆完整性。本文利用多物理耦合程序MPC-LBE,对加速器驱动铅铋冷却次临界堆(eXperimental Accelerator Driven System,XADS)的束流超功率事故进行模拟,并研究了这种事故下反应堆的瞬态安全特性。[Background]In accelerator driven sub-critical system(ADS),the high-energy proton beam produced by accelerator is used to strike the target nucleus,and generate spallation neutrons as external neutrons to drive and maintain its operation.The power level and the safety of ADS are susceptible to the instability of proton beam,such as beam overpower(BOP)which is treated as the typical transient accident for ADS system.In ADS core,the sudden increases of power and temperature will be caused by BOP accident,which may exceed the safety limits of materials,threatening ADS safety.[Purpose]This study aims to investigate the transient safety characteristics of the eXperimental accelerator driven system(XADS)under BOP accident.[Methods]The multi-physics coupling code MPC-LBE,in which the fuel pin heat conduction(HC)model and the point reactor kinetics(PK)model were coupled with self-developed computational fluid dynamics(CFD)code,was employed to simulate BOP accident of XADS.Firstly,the MPC-LBE simulation model of XADS was constructed and then the steady state condition was established.On this basis,the double and triple BOP accident cases were simulated,and the safety boundary of BOP accident conditions was also evaluated.[Results]For the simulation results,in the double and triple BOP cases,the reactor powers increase to only 1.88 and 2.7 times of the original ones,respectively.The maximum temperature of the cladding is about 843 K in the triple BOP case,exceeding its safety limit.[Conclusions]Conclusions can be drawn that the negative temperature feedback effect plays an important role in protecting the reactor from power sharp rise,and the double BOP case can be treated as the BOP safety boundary of BOP accident in XADS.

关 键 词：加速器驱动铅铋冷却次临界堆 束流超功率 MPC-LBE 多物理耦合 瞬态安全特性 

分 类 号：TL99[核科学技术—核技术及应用]