Method for savings in nuclear reactors by using beryllium...

Details Method for savings in nuclear reactors by using beryllium... Method for savings in nuclear reactors by using beryllium...

G - Physics

21

G

359/17, 359/68

G21G 1/02 (2006.01)

Patent

CA 1100649

ABSTRACT OF THE DISCLOSURE: The effect of the (n,2n) reactions of beryllium when exposed to fast neutrons having energies at or above the (n,2n) threshold for beryllium is utilized to achieve reactivi- ty increases with at least one beryllium rod properly embedded in a bundle-type fuel element. The reactivity increases are obtained by positioning the beryllium rod at regions of the reactor where the neutrons are fast with the amount of inserted beryllium being such that the volume ratio of beryllium to beryllium and fuel is of about 5.3% when the reactor is moderated with heavy water or the volume ratio of beryllium to fuel is of about 8.2% when the reactor is moderated with light water. Such reactivity advantageously be employed to reduce the amount of heavy water moderator inventory in a heavy water reactor or to relax the requirement of uranium enrichment in a light water reactor.

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