ROD ARRANGEMENT TO FUEL BUNCHES FOR OPERATING NUCLEAR REACTORS

摘要

A rod arrangement for fuel assemblies has a supporting structure that functions to support fuel rods forming fuel assemblies, central section on bearing area confined within supporting structure, and fuel rods arranged near central section; part of fuel rods are doped with burning-out denaturant that functions to reduce initial radioactivity; bearing area 1b accommodates three rods doped with burning-out denaturant 3 and spaced in central section 1c of bearing area 1b 120 deg. (angle ) apart as viewed on bearing-area longitudinal axis 1c. Gadolinium is used as dope reducing initial radioactivity of rods with burning-out denaturant.