Enhancement of Transmutation of Minor Actinides by Hydride Target

Konashi, Kenji; Yokoyama, Tsugio

doi:10.1007/978-4-431-55111-9_16

Cited by 2 publications

(3 citation statements)

References 2 publications

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“…FBRs provide high fast neutron flux, where the neutron reaction cross sections are small compared with that in the thermal energy region. Moderation of fast neutron by hydride materials was considered to increase the transmutation rate [2][3][4][5]. Figure 1 shows how Hf hydride enhances neutron absorption reaction.…”

Section: Enhancement Of Neutron Absorption Reaction By Hf Hydridementioning

confidence: 99%

“…Another application of the hydride material is the utilization for transmutation target of long-lived nuclear wastes [5,6]. The currently available method for final disposal of the high-level wastes is vitrified them under rigid control, to store them in monitored spots until the radiation level decays to allowable levels and to dispose them underground.…”

Section: Introductionmentioning

confidence: 99%

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Utilization Research and Development of Hydride Materials in Fast Reactors

Konashi

Itoh²,

Yokoyama

et al. 2014

Advances in Science and Technology

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Metal hydrides have high hydrogen atom density, which is equivalent to that of liquid water. An application of the hafnium hydride has been investigated as a neutron absorber in the Fast Breeder Reactors (FBRs). Fast neutrons are efficiently moderated by hydrogen in Hf hydrides and are absorbed by Hf. Since three isotopes of Hf have large cross sections, increase in the life of control rod is considered by Hf hydride. Results of design study of the core with Hf hydride control rods shows that the long lived hafnium hydride control rod is feasible in the large sodium-cooled FBR. Results of irradiation test conducted in BOR-60 has demonstrated the integrity of the capsules during irradiation. Na bonded capsule has an advantage in confinement effect of hydrogen compared with He bonded one. An application of hydride technique to transmutation target of MA was also discussed. MA hydride target is able to enhance the transmutation rate in FBR.

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Section: Enhancement Of Neutron Absorption Reaction By Hf Hydridementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Utilization Research and Development of Hydride Materials in Fast Reactors

Konashi

Itoh²,

Yokoyama

et al. 2014

Advances in Science and Technology

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show abstract

“…The other application of hydride is utilisation as a transmutation target of long lived nuclear wastes. 5 A currently available method of final disposal of high level radioactive wastes is to vitrify them under rigid control, to store them in monitored spots until the radiation level decays to allowable ones and to dispose them underground. To reduce the need of work for this type of isolation, many kinds of transmutation methods have been proposed and studied.…”

Section: Introductionmentioning

confidence: 99%

Environmentally friendly application of hydrides to nuclear reactor cores

Konashi

Yamawaki

2012

Advances in Applied Ceramics

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As new environmentally friendly techniques, hydride materials have been proposed to be introduced to fast reactor (FR) cores in this paper. Hydrogen atoms in metal hydride can efficiently moderate fast neutrons. Based on this fact, some metal hydrides have been investigated for their potential environmentally friendly application as nuclear materials to be used in FR cores. Two types of utilisation of metal hydrides in FR cores are discussed in this paper. One is the application of hafnium hydride as neutron absorber in FR cores. The core design has been carried out to examine its characteristics as well as to evaluate the cost reduction effect. Demonstration of the fabrication of hydride pins has been performed using hydride pellets and stainless steel claddings. The coating technique of the inner cladding surface has also been developed to reduce the permeation of hydrogen through the stainless steel cladding. The physical and chemical properties of the pellet have been measured for the purpose of designing a hafnium hydride pin. Irradiation test of the hydride pins has been performed in the experimental FR, JOYO, Japan Atomic Energy Agency. The other application is the utilisation as a transmutation target of long lived nuclear wastes. Hydride fuel containing 237 Np, 241 Am and 243 Am has been studied for a candidate transmutation target to be used to reduce the radioactivity of long lived nuclides contained in the nuclear wastes, which are obtained after reprocessing spent fuels.

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Enhancement of Transmutation of Minor Actinides by Hydride Target

Cited by 2 publications

References 2 publications

Utilization Research and Development of Hydride Materials in Fast Reactors

Utilization Research and Development of Hydride Materials in Fast Reactors

Environmentally friendly application of hydrides to nuclear reactor cores

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