The Influence of the (n,2n) and (n,/cap alpha/) Reactions of Beryllium on the Neutron Balance in a BeO or Be Moderated Reactor and Its Consequences on the Long Term Reactivity Changes; INFLUENCE DES REACTIONS (n,2n) ET (n,*cap alpha/) DU BERYLLIUM SUR LE BILAN NEUTRONIQUE D'UN REACTEUR MODERE A L'OXYDE DE BERYLLIUM OU AU BERYLLIUM. CONSEQUENCES SUR L'EVOLUTION A LONG TERME De la reactivite
Technical Report
·
OSTI ID:4276499
The reaction probabilities in an infinite and homogeneous medium of BeO or Be were calculated from neutron cross section curves. for a neutron produced with an energy distribution similar to a fission spectrum. The calculation shows that after several elastic collisions the neutron still has an appreciable probability to undergo a reaction, in spite of the energy degradation in the spectrum due to each collision. This degradation was calculated, taking irto account the anisotropy of the collisions. The gain of the reactivity in a reactor was obtained affer correcting these probabilities for the attenuation of the flux of fission neutrons due to the inelastic scattering in the uranium. Finally, the calculation shows that in a power reactor this gain of reactivity is in practice destroyed in a few years by the accumulation of poisonous nuclei such as Li/sup 6/ and He/sup 3/ following (n, alpha ) reactions. (auth)
- Research Organization:
- France. Commissariat a l'Energie Atomique, Paris
- NSA Number:
- NSA-13-009362
- OSTI ID:
- 4276499
- Report Number(s):
- CEA-826
- Country of Publication:
- France
- Language:
- English
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Journal Article
·
Wed Jan 31 23:00:00 EST 1962
· J. Nuclear Energy, Pts. A & B. Reactor Sci. and Technol.
·
OSTI ID:4783086
THE Be$sup 9$ (n,2n) Be$sup 8$ REACTION AND ITS INFLUENCE ON THE INFINITE MULTIPLICATION FACTOR FOR BERYLLIUM MODERATED HETEROGENEOUS THERMAL REACTORS
Technical Report
·
Fri Oct 30 23:00:00 EST 1959
·
OSTI ID:4256425
THE EFFECT OF THE (n,2n) AND THE (n,$alpha$) REACTIONS ON THE REACTIVITY OF MGCR BERYLLIUM OXIDE MODERATED CORES
Technical Report
·
Sun Dec 27 23:00:00 EST 1959
·
OSTI ID:4841368
Related Subjects
ALPHA PARTICLES
ANGULAR DISTRIBUTION
BERYLLIUM
BERYLLIUM MODERATOR
BERYLLIUM OXIDES
CROSS SECTIONS
DISTRIBUTION
ELASTIC SCATTERING
ENERGY
EQUATIONS
FAST NEUTRONS
FISSION
FISSION PRODUCTS
HELIUM 3
HOMOGENEOUS REACTORS
INELASTIC SCATTERING
INTERACTIONS
LITHIUM 6
MULTIPLICATION FACTORS
NEUTRON FLUX
NEUTRONS
NUCLEAR REACTIONS
POISONING
POWER PLANTS
PRODUCTION
REACTIVITY
REACTOR CORE
REACTORS
SCATTERING
SLOWDOWN
SPECTRA
STABILITY
STATISTICS
THERMAL NEUTRONS
TRANSIENTS
URANIUM
VARIATIONS
VOLUME
ANGULAR DISTRIBUTION
BERYLLIUM
BERYLLIUM MODERATOR
BERYLLIUM OXIDES
CROSS SECTIONS
DISTRIBUTION
ELASTIC SCATTERING
ENERGY
EQUATIONS
FAST NEUTRONS
FISSION
FISSION PRODUCTS
HELIUM 3
HOMOGENEOUS REACTORS
INELASTIC SCATTERING
INTERACTIONS
LITHIUM 6
MULTIPLICATION FACTORS
NEUTRON FLUX
NEUTRONS
NUCLEAR REACTIONS
POISONING
POWER PLANTS
PRODUCTION
REACTIVITY
REACTOR CORE
REACTORS
SCATTERING
SLOWDOWN
SPECTRA
STABILITY
STATISTICS
THERMAL NEUTRONS
TRANSIENTS
URANIUM
VARIATIONS
VOLUME