Theoretical analysis of long-lived radioactive waste in pressurized water reactor

Fang, Ze-Xin; Yu, Meng; Huang, Yingge; Chen, Jinbei; Su, Jun; Zhu, Long

doi:10.1007/s41365-021-00911-0

Cited by 13 publications

(2 citation statements)

References 56 publications

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“…Radionuclides have been proven to be powerful tracers for soil erosion investigation [2,3,4]. Plutonium and 137 Cs (T 1/2 = 30.17 a) are artificial radionuclides mainly produced by artificial nuclear activities [5,6,7,8,9]. 239 Pu (T 1/2 = 2.411 × 10 4 a) and 240 Pu (T 1/2 = 6563 a) were the most important plutonium isotopes.…”

Section: Introductionmentioning

confidence: 99%

First application of plutonium in soil erosion research on terraces

et al. 2023

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The spatial distributions of 239+240Pu and 137Cs in soils from Longji Rice Terraces were investigated to evaluate soil erosion. The activity concentrations of 239+240Pu and 137Cs in the surface soils of the paddy fields were in the range of 0.089–0.734 and 1.80–7.88 mBq/g, respectively. The activities of 239+240Pu and 137Cs showed very similar distribution trends, first increasing and then decreasing with increasing elevation. The 240Pu/239Pu atom ratios in the surface soils ranged from 0.162 to 0.232. The activities of 239+240Pu and 137Cs in the soil cores tended to be uniformly distributed within the plowed layer and declined exponentially below this depth. The mean soil erosion rates of Longji Rice Terraces estimated by 239+240Pu and 137Cs tracer methods were 5.44 t/(ha·a) and 5.16 t/(ha·a), respectively, which demonstrated that plutonium can replace 137Cs as an ideal tracer for soil erosion research in the future. Landform features are the main factors affecting the distribution of plutonium and 137Cs as well as soil erosion in the Longji Rice Terraces.

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Section: Introductionmentioning

confidence: 99%

First application of plutonium in soil erosion research on terraces

et al. 2023

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“…This article concerns the sensitivity of the experimental determination of reactivity to its changes in a subcritical reactor. Such reactors have been proposed for the transmutation of higher actinides, removed from spent nuclear fuel [1][2][3][4][5], with the help of fast neutrons. Subcriticality provides a higher level of criticality safety than the critical fast reactors used for this purpose.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of the area method with mono isotopic fission chambers to reactivity changes in subcritical nuclear reactors

2021

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High-level waste is an important safety issue in the development of nuclear power. A proposed solution is the transmutation of waste in fast reactors. The exclusion of the risk of supercriticality by using subcritical reactors is currently under development. Controlling the subcriticality level in such reactors presents difficulties. A problem is posed by the so-called space effect observed when using in reactors many neutron detectors in different locations of the core and reflector. Reactivity obtained from measurements, for example, by the Sjöstrand method, differs by nonnegligible values. Numerical corrections can partially improve this situation. The use of a monoisotopic fission chamber set, designed for a given reactor, when each chamber is intended for a specific position in the system, can improve the situation. A question arises about the sensitivity of the results to reactivity changes. This issue is analyzed by computer simulation for possible fissionable and fissile nuclides for the total range of control rod insertion, changes in reactor fuel enrichment, and fuel temperature. The tested sensitivity was satisfactory at most levels from several dozen to several hundred pcm. A case study was conducted using the VENUS-F core model.

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Yield of long-lived fission product transmutation using proton-, deuteron-, and alpha particle-induced spallation

Jin

Yang

et al. 2021

NUCL SCI TECH

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Theoretical analysis of long-lived radioactive waste in pressurized water reactor

Cited by 13 publications

References 56 publications

First application of plutonium in soil erosion research on terraces

First application of plutonium in soil erosion research on terraces

Sensitivity of the area method with mono isotopic fission chambers to reactivity changes in subcritical nuclear reactors

Yield of long-lived fission product transmutation using proton-, deuteron-, and alpha particle-induced spallation

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