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Cold neutron moderator on an upgraded IBR-2 reactor: The first set of results
Authors:V D Anan’ev  A A Belyakov  M V Bulavin  A E Verkhoglyadov  S A Kulikov  K A Mukhin  E P Shabalin
Institution:1. Joint Institute for Nuclear Research, Dubna, Moscow oblast, 141980, Russia
Abstract:The first criticality of a new KZ-202 neutron moderator on the IBR-2M reactor is achieved. The moderator consists of thermal and cold units. The former is a room-temperature comb water moderator; the latter, a moderator using a mixture of aromatic hydrocarbons (mesitylene and m-xylene). The cold moderator is filled with granules of this mixture, which are supplied by a cold helium flow, and operates at 30 K. The combination of two units in one moderator makes it possible to simultaneously take the thermal and cold neutron spectra for extracted-beam spectrometers. The arrangement of the thermal and cold moderators is numerically optimized by the Monte Carlo method. The use of the cold moderator allows a 13-fold increase in the cold neutron intensity from its surface.
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