الفهرس 
LITERATURE REVIEWOnly 14 pages are availabe for public view
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Abstract
The Toroidal field coils of the International Ihennonuclear ,Experimental Reactor (ITER) constitute the most sensitive part of the whole reactor assembly, as they are made of a supercondueting material cooled at 4.5 oK. Any change in this temperature would change the perfonnance of the toroidal field coils. Therefore nuclear heating must be prevented.
’The major concern in the insertion of the blanket modules in ITER is the impact of neutrons and photons, passing through the blanket modules and streaming through the gaps, on the superconducting toroidal field coils, where the most stringent limit, is the threshold of local nuclear heating of 1 m W tcm3 in the coil conductors.
In this thesis, the impact of blanket materials and dimensions on the nuclear heating in the tcroidal field coil conductors was studied. The nuclear heating was calculated using . MCNP-4B software. The nuclear heating values at the toroidal field coil conductors were calculated for different shielding blanket thicknesses. It was found that there is an exponential relationship between the blanket thickness and the nuclear heating. All the different blanket thicknesses confonn to the nuclear heating design limitation, which is 1 mW/cm3• The nuclear heating values at the toroidal field coil conductors were also calculated for different breeding materials, and different breeder rods radii. It was found that there is a statistical variation between the breeder rods radii and the nuclear heating for any breeding material. When these variations were analyzed, it was found that there are overlapping regions between the 20 confidence intervals associated with the nuclear ’. faeating values, which indicates that there is a probability that these nuclear heating values . _ nearly equal or the difference between them is insignificant. Conclusively, we can say .- IbIt the nuclear heating value at the toroidal field coil conductors is not affected by changing the breeding rods radii. It was also found that all the different breeder rods radii for different breeding materials agree with the nuclear heating design limitation. The highest difference between the maximum values of the nuclear heating for the different breeding materials was found to be 6 % only. This means that the choice of a breeder material is not influenced by the amount of nuclear heating.