Nuclide Importance and the Steady-State Burnup Equation

Sekimoto, Hiroshi; Nemoto, Atsushi

doi:10.13182/nse00-a2127

Cited by 8 publications

(2 citation statements)

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“…Table 7 also shows a net neutron importance, a measure directly estimating neutron economy. 19) The net neutron importance can be evaluated simply by calculating the fission neutron importance minus the absorbed neutron importance. In general, this value becomes positive for fissile nuclides and opposite value for fertile ones.…”

Section: Required Uranium Enrichment and Natural Uraniummentioning

confidence: 99%

“…This fact was also mentioned in the reference. 19) Significantly, the net neutron importance of 238 U is very small, which means that most of absorption reactions of 238 U nuclide finally results in the fission reaction of its produced fissile nuclides. The absolute value of this importance for 238 U becomes smaller along the change of cases from 1 to 4.…”

Section: Required Uranium Enrichment and Natural Uraniummentioning

confidence: 99%

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Characteristics of Several Equilibrium Fuel Cycles of PWR

Waris

Sekimoto

2001

Journal of Nuclear Science and Technology

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This paper evaluated the influence of neutron spectrum on characteristics of several equilibrium fuel cycles of pressurized water reactor (PWR). In this study, five kinds of fuel cycles were investigated. Required uranium enrichment, required natural uranium amount, and toxicity of heavy metals (HMs) in spent fuel were presented for comparison. The results showed that the enrichment and the required amount of natural uranium decrease significantly with increasing number of confined heavy nuclides when uranium is discharged from the reactor. On the other hand, when uranium is totally confined, the enrichment becomes extremely high. The confinement of plutonium and minor actinides (MA) seems effective in reducing radio-toxicity of discharged wastes. By confining all heavy nuclides except uranium those three characteristics could be reduced considerably. For this fuel cycle the toxicity of HMs in spent fuel become nearly equal to or less than that of loaded uranium.

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Section: Required Uranium Enrichment and Natural Uraniummentioning

confidence: 99%

Section: Required Uranium Enrichment and Natural Uraniummentioning

confidence: 99%