Abstract

The average neutron transmission probability is necessary in computing the control rods epithermal effectiveness and this calculation has been done for various control rods at normal temperature from the fundamental nuclear cross sections. Those for which we have computed are; 1 Materials (a) Hf, Ag, In and Ag-In-Cd alloy (80:15:5 w/o) (b) Eu2O3 in stainless steel 2 Thickness 0.125, 0.25, 0.50 and 0.75cm for (a) group 2.5, 5.0, 10.0 and 20.0 w/o with 0.50cm thickness for (b) group By comparing resultant values with those obtained experimentally by Bach and Way in Knolls Lab., for Hf, Ag and In, satisfactory agreement has been found in case we apply a modification, caused by deviation from the 1/E spectrum in the epithermal region, to the average transmission probability. We have reached to a conclusion that the modification due to the reactor spectrum is quite essential and that with applying this we can expect our results accurate enough to use.

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