An Aluminum alloy beam dump was used to stop the 34 kW CW proton beam during the commissioning of the superconducting demo LINAC of ADS at the beginning of 2019.It was damaged after 100 h operation with more than 30 k...An Aluminum alloy beam dump was used to stop the 34 kW CW proton beam during the commissioning of the superconducting demo LINAC of ADS at the beginning of 2019.It was damaged after 100 h operation with more than 30 kW beam power.展开更多
In an attempt to allow nuclear power to reach high resource utilization,sufficient nuclear safety,nuclear proliferation resistance and lower financial risk,the concept of accelerator-driven advanced nuclear energy sys...In an attempt to allow nuclear power to reach high resource utilization,sufficient nuclear safety,nuclear proliferation resistance and lower financial risk,the concept of accelerator-driven advanced nuclear energy system(ADANES)is proposed[1;2].ADANES consists of a burner system and a fuel recycling system.The burner system is constructed based on the existing principles of accelerator-driven system(ADS)by combining nuclear waste transmutation,nuclear fuel breeding,and safety power production.Then,the spent nuclear fuels(SNFs)obtained from the water reactor can be reprocessed in the simple high temperature dry reprocessing[3;4](HT-dry reprocessing).In this reprocessing,a part of the nuclides containing neutron poison in the SNFs can be separated and disposed,while the remaining nuclides can be reused to produce new fuel.Using this method,only a fraction of the fission products(FPs)is removed without fine partitioning.展开更多
In an attempt to allow nuclear power to reach high resource utilization,sufficient nuclear safety,nuclear proliferation resistance and lower financial risk,the concept of accelerator-driven ceramic fast reactor(ADCFR)...In an attempt to allow nuclear power to reach high resource utilization,sufficient nuclear safety,nuclear proliferation resistance and lower financial risk,the concept of accelerator-driven ceramic fast reactor(ADCFR)is proposed.The ADCFR could converted loaded nuclear fertile material to fissile fuel and burns it over a 40-year core life without fuel shuffling or supplementation.Figure.1(a)is schematic of accelerator-driven ceramic fast reactor.ADCFR consists of a high-power superconducting linear accelerator[1],a spallation target[2]and an ceramic-coolant fast reactor.This system is constructed based on the accelerator-driven system(ADS)[3]and belongs the burner system in Accelerator-Driven Advanced Nuclear Energy System(ADANES)[4,5].展开更多
The gravity driven granular flow spallation target of C-ADS[1]is designed to produce high flux neutron escape from lateral surface to transmute the long-lived radioactive nuclei of spent fuel.The detailed simulation o...The gravity driven granular flow spallation target of C-ADS[1]is designed to produce high flux neutron escape from lateral surface to transmute the long-lived radioactive nuclei of spent fuel.The detailed simulation of the neutronics performance and activation of dense tungsten granular target has been presented in our previous work[2].Here the efforts have been focus on the stability of the neutron escape from lateral surface.Figures.1 and 2.showed the laterally leaking neutron energy spectrum and laterally leaking neutron axial distribution of the granular target with different time nodes.It can be seen that laterally leaking neutron axial distribution is nearly the same at different time nodes.Therefore,it can be concluded that if the average volume fraction is fixed in the target hopper,the granular flow spallation target can afford a stable external neutron source for subcritical blanket despite that there is a slight change among granule spatial distributions at different time nodes during the flowing.Due to the fact that the granular flow velocity is negligibly small even comparing to the velocity of thermal neutrons,the neutronics of the granular flow target will be nearly the same as that of a static granular target.展开更多
The concept of gravity-driven Dense Granular Target(DGT)has been proposed and tungsten granule is one of the candidate target materials[1].With the increase of DGT diameter,the efficiency of its external neutrons is s...The concept of gravity-driven Dense Granular Target(DGT)has been proposed and tungsten granule is one of the candidate target materials[1].With the increase of DGT diameter,the efficiency of its external neutrons is significantly reduced,which is not conducive to the design of high-power.Low density porous tungsten particles are proposed as the target material of DGT instead of the natural tungsten.The results show that there is an optimal combination of tungsten granular density and target diameter to make the utmost of leakage neutrons.展开更多
The concept of gravity-driven Dense Granular Target(DGT)has been proposed and tungsten granule is one of the candidate target materials[1].With the increase of DGT diameter,the efficiency of its external neutrons is s...The concept of gravity-driven Dense Granular Target(DGT)has been proposed and tungsten granule is one of the candidate target materials[1].With the increase of DGT diameter,the efficiency of its external neutrons is significantly reduced,which is not conducive to the design of high-power.Low density porous tungsten particles are proposed as the target material of DGT instead of the natural tungsten.The results show that there is an optimal combination of tungsten granular density and target diameter to make the utmost of leakage neutrons.展开更多
文摘An Aluminum alloy beam dump was used to stop the 34 kW CW proton beam during the commissioning of the superconducting demo LINAC of ADS at the beginning of 2019.It was damaged after 100 h operation with more than 30 kW beam power.
文摘In an attempt to allow nuclear power to reach high resource utilization,sufficient nuclear safety,nuclear proliferation resistance and lower financial risk,the concept of accelerator-driven advanced nuclear energy system(ADANES)is proposed[1;2].ADANES consists of a burner system and a fuel recycling system.The burner system is constructed based on the existing principles of accelerator-driven system(ADS)by combining nuclear waste transmutation,nuclear fuel breeding,and safety power production.Then,the spent nuclear fuels(SNFs)obtained from the water reactor can be reprocessed in the simple high temperature dry reprocessing[3;4](HT-dry reprocessing).In this reprocessing,a part of the nuclides containing neutron poison in the SNFs can be separated and disposed,while the remaining nuclides can be reused to produce new fuel.Using this method,only a fraction of the fission products(FPs)is removed without fine partitioning.
文摘In an attempt to allow nuclear power to reach high resource utilization,sufficient nuclear safety,nuclear proliferation resistance and lower financial risk,the concept of accelerator-driven ceramic fast reactor(ADCFR)is proposed.The ADCFR could converted loaded nuclear fertile material to fissile fuel and burns it over a 40-year core life without fuel shuffling or supplementation.Figure.1(a)is schematic of accelerator-driven ceramic fast reactor.ADCFR consists of a high-power superconducting linear accelerator[1],a spallation target[2]and an ceramic-coolant fast reactor.This system is constructed based on the accelerator-driven system(ADS)[3]and belongs the burner system in Accelerator-Driven Advanced Nuclear Energy System(ADANES)[4,5].
文摘The gravity driven granular flow spallation target of C-ADS[1]is designed to produce high flux neutron escape from lateral surface to transmute the long-lived radioactive nuclei of spent fuel.The detailed simulation of the neutronics performance and activation of dense tungsten granular target has been presented in our previous work[2].Here the efforts have been focus on the stability of the neutron escape from lateral surface.Figures.1 and 2.showed the laterally leaking neutron energy spectrum and laterally leaking neutron axial distribution of the granular target with different time nodes.It can be seen that laterally leaking neutron axial distribution is nearly the same at different time nodes.Therefore,it can be concluded that if the average volume fraction is fixed in the target hopper,the granular flow spallation target can afford a stable external neutron source for subcritical blanket despite that there is a slight change among granule spatial distributions at different time nodes during the flowing.Due to the fact that the granular flow velocity is negligibly small even comparing to the velocity of thermal neutrons,the neutronics of the granular flow target will be nearly the same as that of a static granular target.
文摘The concept of gravity-driven Dense Granular Target(DGT)has been proposed and tungsten granule is one of the candidate target materials[1].With the increase of DGT diameter,the efficiency of its external neutrons is significantly reduced,which is not conducive to the design of high-power.Low density porous tungsten particles are proposed as the target material of DGT instead of the natural tungsten.The results show that there is an optimal combination of tungsten granular density and target diameter to make the utmost of leakage neutrons.
文摘The concept of gravity-driven Dense Granular Target(DGT)has been proposed and tungsten granule is one of the candidate target materials[1].With the increase of DGT diameter,the efficiency of its external neutrons is significantly reduced,which is not conducive to the design of high-power.Low density porous tungsten particles are proposed as the target material of DGT instead of the natural tungsten.The results show that there is an optimal combination of tungsten granular density and target diameter to make the utmost of leakage neutrons.
