NUCLEAR TECHNIQUES, Volume. 46, Issue 3, 030604(2023)
Reliability analysis and optimization of core fuel salt emergency drain system for the molten salt reactor experiment
Figures & Tables(12)
Fig. 1. Schematic diagram of MSRE core fuel salt emergency drain system (a) and schematic diagram of afterheat removal system (b)
Fig. 3. Fault tree for failure of freezing valve FV-103 to thaw on demand
Fig. 4. Fault tree for failure of afterheat removal system in fuel drain tank #1
Fig. 5. Fault tree for failure of transferring fuel salt from tank #1 to tank #2
Table 1. Component failure modes and effects analysis
View tableView in ArticleTable 1. Component failure modes and effects analysis
设备名称
Component name
失效模式
Failure modes
影响分析
Effect analysis
管段103，105或106
Piping 103, 105 or 106
破裂或泄漏
Rupture or leak
堆芯熔盐泄漏，排盐过程故障
Fuel salt leak from line 103, 105 or 106, failure of drainning
冷冻阀FV-103
Freeze valve 103
打开失效
Fail to thaw
堆芯熔盐无法依靠排出
Fuel salt can not be drained by gravity
换热元件外套管
Thimbles
破裂或泄漏
Rupture or leak
熔盐向气隙层泄漏，排盐罐储存熔盐失效
Fuel salt leak from thimbles, the tank fails to storage salt
换热元件中间管
Bayonets
破裂或泄漏
Rupture or leak
汽包中的水向气隙层泄漏，余热排出冷却水循环故障
Steam drum water leak from bayonets, circulating water fault
给水管道806阀门
Valves of line 806
打开失效
Fail to open
向汽包给水失效
Failure to supply water to steam drum
冷却水泵
Cooling water pump
运行失效
Fail to run
向冷凝器供应塔冷却水失效
Failure to supply tower cooling water to condenser
转向阀HCV-882C1
Diversion valve HCV-882C1
不能改变位置
Fail to change in
position
向冷凝器供应备用的工艺用水失效
Failure to supply process water to condenser
管段804，878，802和冷凝器换热管
Piping 804, 878, 802 and heat
exchanger tubes
破裂或泄漏
Rupture or leak
蒸汽或冷却水泄漏，余热排出冷却水循环故障
Steam drum water leak from pipes, circulating water fault
气动阀HCV-909A1，HCV-910A1及
排盐罐气体出口阀门
Pneumatic valve HCV-909A1, HCV-910A1
and outlet valves of FDT
不能保持位置
Fail to remain in
position
排盐罐加压失效，熔盐无法依靠氦气压转移
Failure to pressurize the fuel drain tank, fuel salt can not be transfered by Helium gas pressure
冷冻阀FV-108, FV-109
Freeze valve 108 and 109
打开失效
Fail to thaw
熔盐从管段108和109转移失效
Fuel salt can not be transfered through line 108 and 109
排盐罐及外套管
Fuel drain tank and thimbles
破裂或泄漏
Rupture or leak
排盐罐完整性破坏，排盐罐加压失效
The integrity of FDT fault, failure to pressurize
the fuel drain tank
排盐罐进口阀门
Valves of inlet line in FDT
打开失效
Fail to open
氦气无法进入排盐罐，排盐罐加压失效
Failure to pressurize the fuel drain tank by helium gas
Table 2. Component reliability data
View tableView in ArticleTable 2. Component reliability data
部件类型 Component types 失效代码 Failure code 失效率 Failure rate 单位 Units 误差因子 Error factor 气动阀 Pneumatic valve FC 1.20×10-3 /demand 1.62 FO 8.40×10-4 /demand 5.00 PR 1.20×10-7 /h 3.00 电磁阀 Solenoid valve FC 1.70×10-3 /demand 2.30 FO 1.00×10-3 /demand 2.66 转向阀 Diversion valve CP 3.00×10-3 /demand 2.28 变压器 Transformer FR 1.00×10-6 /h 3.00 塔冷却水泵 Tower cooling water pump FR 2.95×10-5 /h 3.70 管段 Piping section RU 1.00×10-9 /h 30.00 焊缝 Welds RU 3.00×10-9 /h 30.00 冷凝器换热管 Heat exchanger tubes RU 5.00×10-9 /h 10.00
Table 3. Piping sections and welds number
View tableView in ArticleTable 3. Piping sections and welds number
管段Piping section 管段数
Piping section number
焊缝数
Welds number
修正系数
Correction factor
总失效率
Total failure rate / h
103 5 3 3.0 4.20×10-8 105, 106 3 2 3.0 2.70×10-8 806 10 10 1.0 4.00×10-8 878, 802 2 3 1.0 1.10×10-8 单根外套管Single thimble 2 1 3.0 1.50×10-8 单根中间管Single bayonet 5 6 1.0 2.30×10-8
Table 4. Munimum cut sets of core fuel salt emergency drain system
View tableView in ArticleTable 4. Munimum cut sets of core fuel salt emergency drain system
序号
No.
概率
Probability
份额
Portion / %
基本事件
Basic event
1 2.40×10-4 42.68 FDT1-TB-RU 2 2.40×10-4 42.68 FDT2-TB-RU 3 4.08×10-5 7.26 HCV-919A2B2-ALL 4 2.88×10-5 5.12 HCV-919A1B1-ALL
Table 5. Importance of partial basic events in core fuel salt emergency drain system
View tableView in ArticleTable 5. Importance of partial basic events in core fuel salt emergency drain system
基本事件
Basic events
割集重要度
FV
风险降低因子
RDF
风险增加因子
RIF
敏感度
Sensitivity
FDT1-TB-RU 4.27×10-1 1.74 1.78×103 7.86 FDT2-TB-RU 4.27×10-1 1.74 1.78×103 7.86 HCV-919A2B2-ALL 7.26×10-2 1.08 1.78×103 1.77 HCV-919A1B1-ALL 5.12×10-2 1.05 1.78×103 1.53
Table 6. Importance of partial basic events in No.1 afterheat removal system
View tableView in ArticleTable 6. Importance of partial basic events in No.1 afterheat removal system
基本事件
Basic events
割集重要度
FV
风险降低因子
RDF
风险增加因子
RIF
敏感度
Sensitivity
FDT1-BYN-RU 9.17×10-1 12.00 2.49×103 52.90 FDT1-806-RU 4.98×10-2 1.05 2.49×103 1.52 FDT1-878-802-RU 1.37×10-2 1.01 2.49×103 1.14
Table 7. Rationality analysis of two optimization methods
View tableView in ArticleTable 7. Rationality analysis of two optimization methods
优化方法
Optimization methods
合理性
Rationality
1 在制造工艺允许的条件下，套管换热元件可减少使用焊缝数量，降低管段的复杂程度
Under the conditions allowed by the manufacturing process, reduce use welds in thimbles and bayonets, complexity of pipe can be lowered
2 采用不同类型的部件，减小共因失效对冷冻阀解冻失效的影响，同时不影响反应堆运行时冷冻阀能保持冷冻模式
Use different types of components, lower effect by common cause failure on freeze valve thawing, meanwhile do not affect the freeze valve's freeze mode when reactor is operating
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Rongjian LIANG, Liangjie SUN, Xiaowei JIAO, Chaoqun WANG, Qun YANG, Xiaohan YU. Reliability analysis and optimization of core fuel salt emergency drain system for the molten salt reactor experiment[J]. NUCLEAR TECHNIQUES, 2023, 46(3): 030604
Paper Information
Category: Research Articles
Received: Oct. 14, 2022
Accepted: --
Published Online: Apr. 17, 2023
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