固态燃料钍基熔盐实验堆燃耗补偿棒位计算
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摘要
燃耗补偿棒棒位是反应堆监测的一项重要参数,同时棒位移动会对堆芯物理参数分布造成影响。计算了固态燃料钍基熔盐实验堆(Thorium Molten Salt Reactor with Solid Fuel, TMSR-SF1)的补偿棒位变化,并分析其对功率、通量及燃耗分布的影响。在一般蒙特卡罗燃耗软件基础上耦合了调棒临界搜索功能,计算表明大部分临界搜索只需三次,验证了算法收敛的有效性。对TMSR-SF1未分组补偿棒方案进行了计算,结果表明:补偿棒位在氙平衡及寿期末时刻有较大提升幅度,其余时刻近似线性上升;补偿棒初期在总行程一半偏上位置,增加了堆芯轴向功率及中子通量分布的不均匀性,相对寿期末功率峰因子偏大17%,最大中子通量偏大12%。该变化未对总体设计参数造成显著影响,证明补偿棒未分组方案具有设计可行性。
[Background] The location of shim rods is one important monitoring parameter of nuclear reactor, and the shift of shim rods will affect the core physical parameters. [Purpose] This study aims to calculate the location of shim rods varied with burnup time in thorium molten salt reactor with solid fuel(TMSR-SF1), and analyze its effect on the spatial distribution of power density, flux and burnup. [Methods] A reactivity search by adjusting shim rods is coupled to conventional Monte Carlo burnup code. It is validly shown that 3 times are mostly required to realize reactivity convergence. The location of shim rods with one group scheme in TMSR-SF1 is calculated. [Results] Results show that shim rods are sharply moved when near to the time of xenon equilibrium and end of life, while linear changed under middle burnup time. Shim rods at the beginning are located in the upper side of half rod route, which increases the axial unevenness of power density and flux. The power peak factor and maximum flux are 17% and 12% larger than those at the end of life. [Conclusions] This change of power peak factor and maximum flux are accepted and it is feasible to use one group scheme of shim rods in TMSR-SF1.
[Background] The location of shim rods is one important monitoring parameter of nuclear reactor, and the shift of shim rods will affect the core physical parameters. [Purpose] This study aims to calculate the location of shim rods varied with burnup time in thorium molten salt reactor with solid fuel(TMSR-SF1), and analyze its effect on the spatial distribution of power density, flux and burnup. [Methods] A reactivity search by adjusting shim rods is coupled to conventional Monte Carlo burnup code. It is validly shown that 3 times are mostly required to realize reactivity convergence. The location of shim rods with one group scheme in TMSR-SF1 is calculated. [Results] Results show that shim rods are sharply moved when near to the time of xenon equilibrium and end of life, while linear changed under middle burnup time. Shim rods at the beginning are located in the upper side of half rod route, which increases the axial unevenness of power density and flux. The power peak factor and maximum flux are 17% and 12% larger than those at the end of life. [Conclusions] This change of power peak factor and maximum flux are accepted and it is feasible to use one group scheme of shim rods in TMSR-SF1.
引文
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6靖剑平,刘雅宁,贾斌,等.10 MWt固态燃料熔盐堆控制棒失控抽出事故分析[J].核技术,2016,39(10):100604.DOI:10.11889/j.0253-3219.2016.hjs.39.100604.JING Jianping,LIU Yaning,JIA Bin,et al.Accident analyses of uncontrolled rod cluster control assembly bank withdrawal for 10-MWt thorium-based molten salt reactor-solid fuel[J].Nuclear Techniques,2016,39(10):100604.DOI:10.11889/j.0253-3219.2016.hjs.39.100604.
7焦小伟,王凯,何兆忠,等.固态熔盐堆全厂断电ATWS事故工况下的堆芯安全探讨[J].核技术,2015,38(2):020604.DOI:10.11889/j.0253-3219.2015.hjs.38.020604.JIAO Xiaowei,WANG Kai,HE Zhaozhong,et al.Core safety discussion under station blackout ATWS accident of solid fuel molten salt reactor[J].Nuclear Techniques,2015,38(2):020604.DOI:10.11889/j.0253-3219.2015.hjs.38.020604.
8朱贵凤,严睿,于世和,等.动态参数直接统计方法在TMSR-SF1中的应用[J].核技术,2018,41(5):050603.DOI:10.11889/j.0253-3219.2018.hjs.41.050603.ZHU Guifeng,YAN Rui,YU Shihe,et al.An application of direct statistical method for kinetics parameters in TMSR-SF1[J].Nuclear Techniques,2018,41(5):050603.DOI:10.11889/j.0253-3219.2018.hjs.41.050603.
9 Chen X,Zhang J,Dai Y,et al.Experimental investigation of the bed structure in liquid salt cooled pebble bed reactor[J].Nuclear Engineering and Design,2017,331:24-31.DOI:10.1016/j.nucengdes.2018.02.003.
10林大富,刘峰瑞,陈兴伟,等.基于折射率匹配方法的球床三维重构[J].核技术,2017,40(10):100606.DOI:10.11889/j.0253-3219.2017.hjs.40.100606.LIN Dafu,LIU Fengrui,CHEN Xingwei,et al.A3D-reconstruction research on the visual liquid-pebble bed[J].Nuclear Techniques,2017,40(10):100606.DOI:10.11889/j.0253-3219.2017.hjs.40.100606.
11于世和,严睿,冀锐敏,等.PB-FHR的控制棒布局设计及物理效应[J].核技术,2018,41(1):010605.DOI:10.11889/j.0253-3219.2018 hjs.41.010605.YU Shihe,YAN Rui,JI Ruimin,et al.Layout design and physical effect analysis of control rod in PB-FHR[J].Nuclear Techniques,2018,41(1):010605.DOI:10.11889/j.0253-3219.2018 hjs.41.010605.
12朱贵凤.氟盐冷却球床高温堆钍利用研究[D].上海:中国科学院上海应用物理研究所,2015.ZHU Guifeng.Investigation on thorium used in pebble-bed fluoride salt-cooled high temperature reactor[D].Shanghai:Shanghai Institute of Applied Physics,Chinese Academy of Sciences,2015.
13 TMSR中心.10 MW固态燃料钍基熔盐堆堆芯核设计报告[R].上海:中国科学院上海应用物理研究所,2015.TMSR.Core nuclear design of 10 MW thorium-based molten salt experiment reactor with solid fuel[R].Shanghai:Shanghai Institute of Applied Physics,Chinese Academy of Sciences,2015.
2江绵恒,徐洪杰,戴志敏.未来先进核裂变能--TMSR核能系统[J].中国科学院院刊,2012,27(3):366-374.DOI:10.3969/j.issn.1000-3045.2012.03.016.JIANG Mianheng,XU Hongjie,DAI Zhimin.Advanced fission energy program-TMSR nuclear energy system[J].Bulletin of Chinese Academy of Sciences,2012,27(3):366-374.DOI:10.3969/j.issn.1000-3045.2012.03.016.
3冀锐敏,严睿,李晓晓,等.球形燃料元件中包覆颗粒的分布效应研究[J].核技术,2017,40(10):100604.DOI:10.11889/j.0253-3219.2017.hjs.40.100604.JI Ruimin,YAN Rui,LI Xiaoxiao,et al.Effect of TRISO-particles distributions in pebble fuel[J].Nuclear Techniques,2017,40(10):100604.DOI:10.11889/j.0253-3219.2017.hjs.40.100604.
4 Fratoni M,Greenspan E.Neutronic feasibility assessment of liquid salt-cooled pebble bed reactors[J].Nuclear Science and Engineering,2011,168(1):1-22.DOI:10.13182/NSE10-38.
5左嘉旭,高新力,李朝君,等.10 MW固态燃料熔盐实验堆安全分析关键技术初步研究[J].核技术,2017,40(4):040601.DOI:10.11889/j.0253-3219.2017.hjs.40.040601.ZUO Jiaxu,GAO Xinli,LI Chaojun,et al.Preliminary research of safety analysis for 10-MW thorium-based molten salt reactor-solid fuel[J].Nuclear Techniques,2017,40(4):040601.DOI:10.11889/j.0253-3219.2017.hjs.40.040601.
6靖剑平,刘雅宁,贾斌,等.10 MWt固态燃料熔盐堆控制棒失控抽出事故分析[J].核技术,2016,39(10):100604.DOI:10.11889/j.0253-3219.2016.hjs.39.100604.JING Jianping,LIU Yaning,JIA Bin,et al.Accident analyses of uncontrolled rod cluster control assembly bank withdrawal for 10-MWt thorium-based molten salt reactor-solid fuel[J].Nuclear Techniques,2016,39(10):100604.DOI:10.11889/j.0253-3219.2016.hjs.39.100604.
7焦小伟,王凯,何兆忠,等.固态熔盐堆全厂断电ATWS事故工况下的堆芯安全探讨[J].核技术,2015,38(2):020604.DOI:10.11889/j.0253-3219.2015.hjs.38.020604.JIAO Xiaowei,WANG Kai,HE Zhaozhong,et al.Core safety discussion under station blackout ATWS accident of solid fuel molten salt reactor[J].Nuclear Techniques,2015,38(2):020604.DOI:10.11889/j.0253-3219.2015.hjs.38.020604.
8朱贵凤,严睿,于世和,等.动态参数直接统计方法在TMSR-SF1中的应用[J].核技术,2018,41(5):050603.DOI:10.11889/j.0253-3219.2018.hjs.41.050603.ZHU Guifeng,YAN Rui,YU Shihe,et al.An application of direct statistical method for kinetics parameters in TMSR-SF1[J].Nuclear Techniques,2018,41(5):050603.DOI:10.11889/j.0253-3219.2018.hjs.41.050603.
9 Chen X,Zhang J,Dai Y,et al.Experimental investigation of the bed structure in liquid salt cooled pebble bed reactor[J].Nuclear Engineering and Design,2017,331:24-31.DOI:10.1016/j.nucengdes.2018.02.003.
10林大富,刘峰瑞,陈兴伟,等.基于折射率匹配方法的球床三维重构[J].核技术,2017,40(10):100606.DOI:10.11889/j.0253-3219.2017.hjs.40.100606.LIN Dafu,LIU Fengrui,CHEN Xingwei,et al.A3D-reconstruction research on the visual liquid-pebble bed[J].Nuclear Techniques,2017,40(10):100606.DOI:10.11889/j.0253-3219.2017.hjs.40.100606.
11于世和,严睿,冀锐敏,等.PB-FHR的控制棒布局设计及物理效应[J].核技术,2018,41(1):010605.DOI:10.11889/j.0253-3219.2018 hjs.41.010605.YU Shihe,YAN Rui,JI Ruimin,et al.Layout design and physical effect analysis of control rod in PB-FHR[J].Nuclear Techniques,2018,41(1):010605.DOI:10.11889/j.0253-3219.2018 hjs.41.010605.
12朱贵凤.氟盐冷却球床高温堆钍利用研究[D].上海:中国科学院上海应用物理研究所,2015.ZHU Guifeng.Investigation on thorium used in pebble-bed fluoride salt-cooled high temperature reactor[D].Shanghai:Shanghai Institute of Applied Physics,Chinese Academy of Sciences,2015.
13 TMSR中心.10 MW固态燃料钍基熔盐堆堆芯核设计报告[R].上海:中国科学院上海应用物理研究所,2015.TMSR.Core nuclear design of 10 MW thorium-based molten salt experiment reactor with solid fuel[R].Shanghai:Shanghai Institute of Applied Physics,Chinese Academy of Sciences,2015.