Abstract
A theoretical study with use made of the collision probability method has been undertaken on the effect of photo-reactions brought upon the effective yield β of delayed neutrons in a pressure tube type heavy water reactor loaded with 235U. It is concluded that the shielding effect of the reactor structural materials for the hard γ-rays emitted from fission products reduces the contribution of the photo-neutrons to β from the currently used value of 1.00×10−3 to 2.2×10−4.
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