CAP1400安全壳内辐射场计算
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摘要
采用蒙特卡罗(MC)方法直接计算深穿透屏蔽问题并在合理的时间内得到可信的结果是非常困难的。基于离散纵标(SN)的减方差方法采用源偏倚和权窗技巧能够有效降低MC方法计算深穿透问题的计数误差。为了一次计算同时优化不同位置的计数,本文研究了基于SN的全局减方差方法,在CAP1400安全壳内辐射场分布计算中进行了应用。数值结果表明,该方法取得了良好的全局减方差效果,可用于复杂几何深穿透问题。
It is a great challenge to obtain reliable results in reasonable time by the Monte Carlo(MC) method in solving the deep-penetration shielding problem. Based on Discrete Ordinate(SN), variance reduction method uses the biased source and weight window technique to decrease MC calculation tally error for the deep-penetration problem. This paper studies global variance reduction(GVR) method based on SN to simultaneously optimize multiple individual tallies located at different positions by one calculation. The GVR method is applied to calculation of radiation field distribution at all locations within the containment of CAP1400.Numerical results show that the GVR method is effective in global variance reduction and suitable for deep-penetration problem with complex geometry.
It is a great challenge to obtain reliable results in reasonable time by the Monte Carlo(MC) method in solving the deep-penetration shielding problem. Based on Discrete Ordinate(SN), variance reduction method uses the biased source and weight window technique to decrease MC calculation tally error for the deep-penetration problem. This paper studies global variance reduction(GVR) method based on SN to simultaneously optimize multiple individual tallies located at different positions by one calculation. The GVR method is applied to calculation of radiation field distribution at all locations within the containment of CAP1400.Numerical results show that the GVR method is effective in global variance reduction and suitable for deep-penetration problem with complex geometry.
引文
[1]D.E.Peplow,T.M.Evans,J.C.Wagner.Simultaneous Optimization of Tallies in Difficult Shielding Problems[J].Nuclear Technology,2008,168:785-792.
[2]J.C.Wagner,D.E.Peplow,T.M.Evans.Automated Variance Reduction Applied to Nuclear Well-logging Problems[J].Nuclear Technology,2009,168:799-809.
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[4]Z.Zheng,Q.Mei,L.Deng.Application of a Global Variance Reduction Method to HBR-2 Benchmark[J].Nuclear Engineering and Design,2018,326:301-310.
[5]L.Deng.3-D Monte Carlo Neutron-photon Transport Code JMCT and Its Algorithms[C],PHYSOR 2014,Kyoto,Japan,2014.
[6]T.Cheng,J.Wei,H.Shen,et al.,Development of Parallel3D Discrete Ordinates Transport Program on JASMINFramework[C].7ICMSNES,Canadian Nuclear Society,2015.
[7]M.A.Cooper,E.W.Larsen.Automated Weight Windows for Global Monte Carlo Particle Transport Calculations[J].Nuclear Science and Engineering,2001,137:1-13.
[8]Y.Zhou,Z.Zheng,Q.Mei.The Preliminary Shielding Analysis of CAP1400 Based on JMCT-S Code[C].ICONE25,Shanghai,China,2017.
[9]Z.Zheng,Q.Mei,L.Deng.Study on Variance Reduction Technique Based on Adjoint Discrete Ordinate Method[J].Annals of Nuclear Energy,2018,112:374-382.
[10]郑征,丁谦学,王梦琪.一次屏蔽计算TORT源项生成程序研究[J].原子能科学技术,2017,51(10):1905-1909.
[11]W.A.Rhoades,D.B.Simpson.The TORT ThreeDimensional Discrete Ordinates Neutron/Photon Transport Code[R].Version 3,ORNL/TM-13221,Oak Ridge National Laboratory,1997.
[12]Regulatory Guide 1.190,Calculational and Dosimetry Methods for Determining Pressure Vessel Neutron Fluence[R].Nuclear Regulatory Commission,2001.
[2]J.C.Wagner,D.E.Peplow,T.M.Evans.Automated Variance Reduction Applied to Nuclear Well-logging Problems[J].Nuclear Technology,2009,168:799-809.
[3]J.C.Wagner,D.E.Peplow,S.W.Mosher.FW-CADISMethod for Global and Regional Variance Reduction of Monte Carlo Radiation Transport Calculations[J].Nuclear Science and Engineering,2014,176:37-57.
[4]Z.Zheng,Q.Mei,L.Deng.Application of a Global Variance Reduction Method to HBR-2 Benchmark[J].Nuclear Engineering and Design,2018,326:301-310.
[5]L.Deng.3-D Monte Carlo Neutron-photon Transport Code JMCT and Its Algorithms[C],PHYSOR 2014,Kyoto,Japan,2014.
[6]T.Cheng,J.Wei,H.Shen,et al.,Development of Parallel3D Discrete Ordinates Transport Program on JASMINFramework[C].7ICMSNES,Canadian Nuclear Society,2015.
[7]M.A.Cooper,E.W.Larsen.Automated Weight Windows for Global Monte Carlo Particle Transport Calculations[J].Nuclear Science and Engineering,2001,137:1-13.
[8]Y.Zhou,Z.Zheng,Q.Mei.The Preliminary Shielding Analysis of CAP1400 Based on JMCT-S Code[C].ICONE25,Shanghai,China,2017.
[9]Z.Zheng,Q.Mei,L.Deng.Study on Variance Reduction Technique Based on Adjoint Discrete Ordinate Method[J].Annals of Nuclear Energy,2018,112:374-382.
[10]郑征,丁谦学,王梦琪.一次屏蔽计算TORT源项生成程序研究[J].原子能科学技术,2017,51(10):1905-1909.
[11]W.A.Rhoades,D.B.Simpson.The TORT ThreeDimensional Discrete Ordinates Neutron/Photon Transport Code[R].Version 3,ORNL/TM-13221,Oak Ridge National Laboratory,1997.
[12]Regulatory Guide 1.190,Calculational and Dosimetry Methods for Determining Pressure Vessel Neutron Fluence[R].Nuclear Regulatory Commission,2001.