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Superior techniques for disposal of highly radioactive waste (HLW)

Pusch, Roland and Weston, Richard LU (2015) In Environmental Earth Sciences 73(9). p.5219-5231
Abstract
The Swedish Nuclear Fuel and Waste Management Company (SKB) has recently worked out a concept, KBS-3V, for disposal of highly radioactive waste in the form of spent reactor fuel and asked for the Government's approval and licensing. It implies blasting of tunnels at about 400 m depth and boring of large-diameter canister deposition holes extending vertically from the tunnel floor. The rock stresses will be critically high in the construction phase and lead to failure by spalling when the heat pulse from the canisters evolves. The canisters will be surrounded by dense expansive "buffer" clay for minimizing groundwater flow around and along them but the long-term performance of either of them is not adequately proven and the placement... (More)
The Swedish Nuclear Fuel and Waste Management Company (SKB) has recently worked out a concept, KBS-3V, for disposal of highly radioactive waste in the form of spent reactor fuel and asked for the Government's approval and licensing. It implies blasting of tunnels at about 400 m depth and boring of large-diameter canister deposition holes extending vertically from the tunnel floor. The rock stresses will be critically high in the construction phase and lead to failure by spalling when the heat pulse from the canisters evolves. The canisters will be surrounded by dense expansive "buffer" clay for minimizing groundwater flow around and along them but the long-term performance of either of them is not adequately proven and the placement impractical and risky. Four major changes of the concept would make it satisfactory. One involves reorientation of the deposition holes from vertical to 45 degrees inclination in two directions for reducing the risk of rock failure. A second is to prepare ready-made stiff units of "supercontainers" with highly compacted blocks of clay tightly surrounding the canisters for simpler and safer installation of clay blocks and canisters. A third is to surround the supercontainers by clay mud that provides the dense buffer with water from start and supports the surrounding rock when the thermal pulse begins to raise the rock stresses. A fourth is to replace the proposed smectite-rich buffer by clay with higher chemical stability and lower but sufficient expandability. A possible fifth change can be to manufacture homogeneous copper canisters of HIPOW type, which would radically reduce the risk of contamination of groundwater by released radionuclides. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Clay, Canisters, Disposal, Radioactive waste
in
Environmental Earth Sciences
volume
73
issue
9
pages
5219 - 5231
publisher
Springer
external identifiers
  • wos:000353803600036
  • scopus:84929061354
ISSN
1866-6280
DOI
10.1007/s12665-012-1545-y
language
English
LU publication?
yes
id
9f6ddaf8-2dd7-4c19-97e8-0825538b0473 (old id 7433123)
date added to LUP
2015-06-24 09:01:33
date last changed
2017-09-17 04:01:03
@article{9f6ddaf8-2dd7-4c19-97e8-0825538b0473,
  abstract     = {The Swedish Nuclear Fuel and Waste Management Company (SKB) has recently worked out a concept, KBS-3V, for disposal of highly radioactive waste in the form of spent reactor fuel and asked for the Government's approval and licensing. It implies blasting of tunnels at about 400 m depth and boring of large-diameter canister deposition holes extending vertically from the tunnel floor. The rock stresses will be critically high in the construction phase and lead to failure by spalling when the heat pulse from the canisters evolves. The canisters will be surrounded by dense expansive "buffer" clay for minimizing groundwater flow around and along them but the long-term performance of either of them is not adequately proven and the placement impractical and risky. Four major changes of the concept would make it satisfactory. One involves reorientation of the deposition holes from vertical to 45 degrees inclination in two directions for reducing the risk of rock failure. A second is to prepare ready-made stiff units of "supercontainers" with highly compacted blocks of clay tightly surrounding the canisters for simpler and safer installation of clay blocks and canisters. A third is to surround the supercontainers by clay mud that provides the dense buffer with water from start and supports the surrounding rock when the thermal pulse begins to raise the rock stresses. A fourth is to replace the proposed smectite-rich buffer by clay with higher chemical stability and lower but sufficient expandability. A possible fifth change can be to manufacture homogeneous copper canisters of HIPOW type, which would radically reduce the risk of contamination of groundwater by released radionuclides.},
  author       = {Pusch, Roland and Weston, Richard},
  issn         = {1866-6280},
  keyword      = {Clay,Canisters,Disposal,Radioactive waste},
  language     = {eng},
  number       = {9},
  pages        = {5219--5231},
  publisher    = {Springer},
  series       = {Environmental Earth Sciences},
  title        = {Superior techniques for disposal of highly radioactive waste (HLW)},
  url          = {http://dx.doi.org/10.1007/s12665-012-1545-y},
  volume       = {73},
  year         = {2015},
}