IMPROVED CONTROL ASSEMBLY OF GRAY RODS Russian patent published in 2010 - IPC G21C7/00 

FIELD: power industry.

SUBSTANCE: reactor has a row of fuel assemblies, each of which consists of large number of fuel rods retained in certain order with transverse support grids, row of guides passing through support grids along fuel rods. Control assembly of gray rods includes the cross-piece which is intended for controlled introduction of assemblies of gray rods to the guides of fuel assembly for the purpose of controlling the level of reactor power. Each assembly of gray rods consists of long tubular element, the first end plug, the second end plug, neutron absorber practically from fine silver, which is distributed inside tubular element and support tube enveloping the neutron absorber inside tubular element. Support tube prevents silver swelling.

EFFECT: increasing delta power of reactor owing to minimising the surface area, counter-action to volume swelling of neutron absorber and reducing the risk of cracking of covers of absorbing rods.

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