Speaker
Chang Hyun Noh
(NFRI)
Description
ITER Thermal shield (TS) is a thermal barrier in the ITER tokamak to minimize heat load transferred by thermal radiation from the hot components to the superconducting magnets operating at 4.2K. TS supports are designed to endure a dead weight, seismic load, electro-magnetic load and thermal loads.
In the design and analysis of the TS supports, deterministic values of the geometry or dimension of the components, load condition and material properties are used. However, the actual dimensions will be random during the manufacturing process and controlled in the form of tolerance. Mechanical properties of the material are varied due to uncertainties in the chemistry and fabrication procedures used. The loads acting on the support also have variability due to fluctuation of specific weight of the material as well as changes in the dynamic load such as seismic load and electro-magnetic load.
In the deterministic design practice, the safety factors are used to account for the variability of the system. On the other hand, probability of the failure will be specified after reliability analysis under the probability distribution of the input parameters. In this paper, design sensitivity study will be carried to see the effect of the variation of the geometry, material properties and load conditions. And reliability analysis will be performed and probability of the failure will be verified on the CTS support. Dimension, material properties and load condition are to be treated as random processes for the reliability analysis of the support.
Co-authors
Chang Hyun Noh
(NFRI, Daejeon, South Korea)
Dong Kwon Kang
(NFRI, Daejeon, South Korea)
Jongmin Lim
(KAERI, Daejeon, South Korea)
Kwanwoo Nam
(NFRI, Daejeon, South Korea)
Kyoung-O Kang
(NFRI, Daejeon, South Korea)
Wooho Chung
(NFRI, Daejeon, South Korea)