Publication Laka-library:
Neutron noise in a reactor with circulating liquid fuel (1968)
| Author | J.A.H.Kersten, Kempkes |
| Date | May 1968 |
| Classification | 1.01.8.41/08 (KEMA ARNHEM - KSTR (KEMA SUSPENSIE TEST REACTOR)) |
| Front | 
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From the publication:
Neutron noise in a reactor with circulating liquid fuel. J.A.H. Kersten A. Kempkes I. Introduction The low frequency neutron flux fluctuations in the homogeneous near-critical assembly of KEMA were analysed by correlation techniques. A circulating suspension of mixed ThO2 - UO2 -particles of 5/ um diameter in light water with a volume concentration of 3% was used as a fuel, the ThO2: UO2 ratio being 85 : 15, with the uranium enriched up to 90%., The suspension was colloïd chemically unstable. With an unstable suspension the particles can flocculate. The flocs formes have a diameter which is 2-3 times the diameter of the disperged particles, so that the settling velocity is much higher. Form the results of the measurements to be described one may conclude that the low frequency neutron noise of an aqueous suspension reactor depends on the settling velocity of the particles or flocs in the reactor vessel. The settling velocity is determined by the size of the particles or flocs, and b7 the temperature of the liquid. The method of noise analysis may therefore be useful in estimating the size of the particles in a circulating suspension reactor under actual operating conditions. In general, low frequency noise analysis can be a powerful technique for the investigation and understanding of the rheology and hydrodynamics of circulating liquid fuel reactors.
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