Evaluation of Long-Term Irradiation Field in Geological Disposal of High-Level Radioactive Wastes

Vitrified high-level radioactive waste (HLW) is subject to alpha, beta, gamma and neutron irradiation as a result of radionuclidedecay. Radiation can cause chemical and physical effects on HLW geological disposal system, in particular, engineered barrier system (EBS) which consists of vitrified wast...

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Bibliographic Details
Published inJournal of nuclear science and technology Vol. 37; no. sup1; pp. 310 - 315
Main Authors Sawamura, H, Nishimura, K, Naito, M, Ohi, T, Ishihara, Y, Neyama, A
Format Journal Article
LanguageEnglish
Published Taylor & Francis 01.03.2000
Subjects
absorbed dose
buffer material
dose rate
engineered barrier system
High level radioactive waste
host rock
irradiation dose
MCNP4A
Monte Carlo calculation
overpack
radiation transport
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Summary:Vitrified high-level radioactive waste (HLW) is subject to alpha, beta, gamma and neutron irradiation as a result of radionuclidedecay. Radiation can cause chemical and physical effects on HLW geological disposal system, in particular, engineered barrier system (EBS) which consists of vitrified waste, overpack container and surrounded buffer material. Alpha and beta radiation can be shielded completely by the overpack as long as it retains its containment function. Gamma and neutron radiation, on the other hand, will penetrate the overpack, and then enter the buffer material and the host rock. To assess radiation effects within the EBS for long time, it is essential to evaluate the evolution of irradiation field, quantitatively. Thus, radiation transport calculations were done to obtain dose rate, irradiation dose and absorbed dose in the irradiation field. In these calculations, vitrified waste, overpack, buffer and host rock were modeled with a same concentric cylinder.
ISSN:0022-3131
1881-1248
DOI:10.1080/00223131.2000.10874896