Transplutonium isotopes are scarce and need to be produced by irradiation in high flux reactors.However,their production is inefficient,and optimization studies are necessary.This study analyzes the physical nature of...Transplutonium isotopes are scarce and need to be produced by irradiation in high flux reactors.However,their production is inefficient,and optimization studies are necessary.This study analyzes the physical nature of transplutonium isotope produc-tion using ^(252)Cf,^(244)Cm,^(242)Cm,and ^(238)Pu as examples.Traditional methods based on the Monte Carlo burnup calculation have the limitations of many calculations and cannot analyze the individual energy intervals in detail;thus,they cannot sup-port the refined evaluation,screening,and optimization of the irradiation schemes.After understanding the physical nature and simplifying the complexity of the production process,we propose a rapid diagnostic method for evaluating radiation schemes based on the concepts“single energy interval value(SEIV)”and“energy spectrum total value(ESTV)”.The rapid diagnostic method not only avoids tedious burnup calculations,but also provides a direction for optimization.The optimal irradiation schemes for producing ^(252)Cf,^(244)Cm,^(242)Cm,and ^(238)Pu are determined based on a rapid diagnostic method.Optimal irradiation schemes can significantly improve production efficiency.Compared with the initial scheme,the optimal scheme improved the production efficiency of ^(238)Pu by 7.41 times;^(242)Cm,11.98 times;^(244)Cm,65.20 times;and ^(252)Cf,15.08 times.Thus,a refined analysis of transplutonium isotope production is conducted and provides a theoretical basis for improving production efficiency.展开更多
活化-燃耗计算是反应堆分析的重要组成部分,需要耦合临界输运程序和点燃耗程序来迭代求解。LightAB(Light Activation and Burnup)是一个新的轻量化的通用活化-燃耗分析程序,可以用来处理活化-燃耗系统。LightAB采用了基于燃耗计算程序O...活化-燃耗计算是反应堆分析的重要组成部分,需要耦合临界输运程序和点燃耗程序来迭代求解。LightAB(Light Activation and Burnup)是一个新的轻量化的通用活化-燃耗分析程序,可以用来处理活化-燃耗系统。LightAB采用了基于燃耗计算程序ORIGEN-2和ORIGEN-S的燃耗数据库,并使用处理刚性燃耗系统的切比雪夫有理逼近算法(Chebyshev Rational Approximation Method,CRAM)。LightAB支持衰变模式,定通量模式和定功率模式的活化-燃耗计算。为了验证LightAB程序的正确性,计算了237Np衰变问题和锆(Zr)合金的固定通量辐照问题,结果与燃耗程序ORIGEN-2.1一致。实现了LightAB和RMC程序的耦合,并用于计算压水堆(Pressurized Water Reactor,PWR)栅元燃耗基准题、PWR组件燃耗问题、经合组织/核能机构(Organisation for Economic Co-operation and Development/Nuclear Energy Agency,OECD/NEA)快堆燃耗基准问题,计算结果与RMC的燃耗计算模块一致。在超钚同位素的辐照生产与RMC对比模拟计算中,LightAB展现出良好的应用前景。展开更多
We reported the synthesis,single crystal structure,and solid-state UV-Vis-NIR spectroscopy of a new transplutonium metal-organic framework(MOFs),Am(H_(2)O)[PO[(C6H4)COO]_(3)],denoted as AmTPO(TPO=tris(4-carboxylphenyl...We reported the synthesis,single crystal structure,and solid-state UV-Vis-NIR spectroscopy of a new transplutonium metal-organic framework(MOFs),Am(H_(2)O)[PO[(C6H4)COO]_(3)],denoted as AmTPO(TPO=tris(4-carboxylphenyl)-phosphineoxide).AmTPO forms a three-dimensional metal-organic framework structure with americium dimers as the secondary building unit.Clear 5f→5f transi-tions attributed to trivalent americium was observed in the absorption spectrum of AmTPO ranging from 300 to 1200 nm.Notably,AmTPO can maintain the crystallinity with no observable structural degradation within several months after being synthesized,re-vealing a long-term radiation resistance of this structure and the potential application of MOFs as a platform for nuclear waste dis-posal.展开更多
基金sponsored by Natural Science Foundation of Shanghai (NO.22ZR1431900)Science and Technology on Reactor System Design Technology Laboratory.
文摘Transplutonium isotopes are scarce and need to be produced by irradiation in high flux reactors.However,their production is inefficient,and optimization studies are necessary.This study analyzes the physical nature of transplutonium isotope produc-tion using ^(252)Cf,^(244)Cm,^(242)Cm,and ^(238)Pu as examples.Traditional methods based on the Monte Carlo burnup calculation have the limitations of many calculations and cannot analyze the individual energy intervals in detail;thus,they cannot sup-port the refined evaluation,screening,and optimization of the irradiation schemes.After understanding the physical nature and simplifying the complexity of the production process,we propose a rapid diagnostic method for evaluating radiation schemes based on the concepts“single energy interval value(SEIV)”and“energy spectrum total value(ESTV)”.The rapid diagnostic method not only avoids tedious burnup calculations,but also provides a direction for optimization.The optimal irradiation schemes for producing ^(252)Cf,^(244)Cm,^(242)Cm,and ^(238)Pu are determined based on a rapid diagnostic method.Optimal irradiation schemes can significantly improve production efficiency.Compared with the initial scheme,the optimal scheme improved the production efficiency of ^(238)Pu by 7.41 times;^(242)Cm,11.98 times;^(244)Cm,65.20 times;and ^(252)Cf,15.08 times.Thus,a refined analysis of transplutonium isotope production is conducted and provides a theoretical basis for improving production efficiency.
文摘活化-燃耗计算是反应堆分析的重要组成部分,需要耦合临界输运程序和点燃耗程序来迭代求解。LightAB(Light Activation and Burnup)是一个新的轻量化的通用活化-燃耗分析程序,可以用来处理活化-燃耗系统。LightAB采用了基于燃耗计算程序ORIGEN-2和ORIGEN-S的燃耗数据库,并使用处理刚性燃耗系统的切比雪夫有理逼近算法(Chebyshev Rational Approximation Method,CRAM)。LightAB支持衰变模式,定通量模式和定功率模式的活化-燃耗计算。为了验证LightAB程序的正确性,计算了237Np衰变问题和锆(Zr)合金的固定通量辐照问题,结果与燃耗程序ORIGEN-2.1一致。实现了LightAB和RMC程序的耦合,并用于计算压水堆(Pressurized Water Reactor,PWR)栅元燃耗基准题、PWR组件燃耗问题、经合组织/核能机构(Organisation for Economic Co-operation and Development/Nuclear Energy Agency,OECD/NEA)快堆燃耗基准问题,计算结果与RMC的燃耗计算模块一致。在超钚同位素的辐照生产与RMC对比模拟计算中,LightAB展现出良好的应用前景。
基金supported by grants from the National Natural Science Foundation of China(21825601,21790374,21906113,21727801)a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)。
文摘We reported the synthesis,single crystal structure,and solid-state UV-Vis-NIR spectroscopy of a new transplutonium metal-organic framework(MOFs),Am(H_(2)O)[PO[(C6H4)COO]_(3)],denoted as AmTPO(TPO=tris(4-carboxylphenyl)-phosphineoxide).AmTPO forms a three-dimensional metal-organic framework structure with americium dimers as the secondary building unit.Clear 5f→5f transi-tions attributed to trivalent americium was observed in the absorption spectrum of AmTPO ranging from 300 to 1200 nm.Notably,AmTPO can maintain the crystallinity with no observable structural degradation within several months after being synthesized,re-vealing a long-term radiation resistance of this structure and the potential application of MOFs as a platform for nuclear waste dis-posal.
