National Technical University of Athens
School of Mechanical Engineering
Nuclear Engineering Department

Annals of Nuclear Energy Vol. 7, pp. 519 to 552

On the effect of a moderator in the central region of a hollow fuel element (Technical Note)

S.Simopoulos and D.Leonidou
Laboratory of Nuclear Engineering, National Technical University
Pattision 42, Athens(147), Greece

An experimental investigation of the effect of a short slowing down length moderator, in the central region of a hollow fuel element, is attempted in the present work. Water, paraffin and plexiglass have been used as moderator materials. The results obtained show that an increase of the flux level is observed with such a moderator positioned in the central region of the fuel element, when comparing the situation with that existing without a central moderator. The increase is found to depend at least upon the thermal to fast neutron composition of the neutron spectrum.

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