摘要
热阱丧失事故在熔盐堆事故工况中可认为是Ⅱ类工况(一般事故工况),分析该种事故工况下,熔盐堆能否达到设计安全准则的要求,对熔盐堆的设计建造具有指导性意义。本文使用RELAP/MOD4.0进行10 MW固态燃料熔盐堆热阱丧失事故包括最终热阱丧失以及二回路流量丧失的计算。最终热阱丧失事故发生后,一回路冷却剂一次侧向二次侧排热减少,冷却剂、燃料元件温度上升,非能动空气余热排出系统的投入能够有效排出堆芯衰变热,满足安全设计准则。对比最终热阱丧失,发现二回路流量丧失事故下堆芯达到产-排热相对稳定状态所需时间更长,且风机惰转时间对二回路冷却剂温度影响较大,风机惰转时间应控制在100 s之内,且惰转时间越短,二回路冷却剂温度变化越小,越不容易发生熔盐凝固现象。
It is instructive for the design and construction of the molten salt reactor to decide whether the specifications of the molten salt reactor can meet the design criteria under the loss of heat sink accident,which belongs to Class II working condition(general working condition accident).In this paper,the loss of heat sink accidents of the 10 MW solid fuel molten salt reactor are simulated with RELAP/MOD4.0 code,including the final heat sink loss accident and the loss of the second loop flow accident.From the results,under the final heat sink loss accident,the total heat transferred from the primary loop to the secondary loop is reduced,temperature of the coolant and the fuel element will rise.After several hours,the passive air residual heat removal system can effectively remove the core decay heat,which insures the reactor working condition to meet the design criteria.Compared with the final heat sink loss accident,the time required of the reactor core to reach the relative stable state of the heat production and heat removal is longer when the second-circuit flow loss accident occurs.Meanwhile,the fan coasting time has a great influence on the temperature of the secondary circuit coolant,which restricts within 100 seconds.The shorter the fan coasting time,the smaller temperature change of the secondary circuit coolant,and the molten salt solidification will be less likely to occur.
作者
薛冰
刘晓晶
何兆忠
XUE Bing;LIU Xiaojing;HE Zhaozhong(School of Nuclear Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Jiading Campus,Shanghai 201800,China)
出处
《核科学与工程》
CAS
CSCD
北大核心
2019年第6期966-974,共9页
Nuclear Science and Engineering
关键词
最终热阱丧失
二回路流量丧失
安全分析
loss of final heat sink accident
loss of the second loop flow accident
safety analysis
