Development of Concrete with Excellent Radiation Shielding and
Application to Spent Fuel Storage Cask
By E. Owaki, M. Shimono, J. Shimojo and H. Taniuchi
Concrete Journal, Vol.43, No.10, Oct. 2005
- Synopsis
- Heat resistant concrete has been development to make it possible to design a new type cask that has been designed on the same concept of metal cask for use in high temperature conditions. The allowable temperature of conventional concrete is limited to less than 100 degress Celsius because most of its moisture is free water and therefore hydrogen, when is effective for neutron shielding, can be easily lost. Our newly developed concrete has chemical bonded water and as a result can be used under the high temperature exceeding 200 degress Celsius. In addition, the shielding performance of the r ray is secured because the same density as ordinary concrete is maintained in such a high temperature. By using the developed concrete, the closed type hybrid cask for spent fuel storage has been designed with the safety of a metal cask and the economy of a concrete cask. The experiment of the hybrid cask for real scale casting and for long-term heatproof have been conducted and the results has been reported.
- Keywords:
- heat resistant concrete, radiation shielding, spent fuel storage, hybrid cask, concrete cask, chemically bonded water, density
