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- W2246693668 abstract "A study about the contribution of photo neutrons, produced in ({gamma}, n) -reactions of {sup 9}Be into the reactivity worth of {sup 3}He in a reactor with beryllium reflector is presented. Neutron interactions with beryllium lead to formation of {sup 3}T and strong neutron absorbers {sup 3}He and {sup 6}Li in the reflector (so called beryllium poisoning). After the reactor shut down, the concentration of helium - 3 increases in time due to tritium decay. The negative reactivity effect of neutron absorption by accumulated {sup 3}He has been considered in a few papers, concerning reactivity losses in reactors with beryllium reflector. The contributions of the photo neutrons for additional production of tritium during the reactor operation and enhanced build up of helium - 3 after the shut down have not been discussed previously. Calculations of the photonuclear reactions in beryllium are performed for the Belgian Material Testing Reactor BR2 and for a generic reactor model with beryllium reflector. The calculation analysis has shown an increase of about {approx} 20% in the reactivity worth of helium-3 by photo neutrons. The effective fraction of photo neutrons is estimated using MCNP5 with included ({gamma}, n) - reactions. (authors)" @default.
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- W2246693668 date "2006-07-01" @default.
- W2246693668 modified "2023-09-27" @default.
- W2246693668 title "Impact of photo neutrons on reactivity worth of {sup 3}He in a reactor with beryllium reflector" @default.
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