Once-Through Refueling in a Pebble Bed HTGR Core with Burnable Poison for Attaining Low Axial Power Peaking

Abstract

In a once-through refueling pebble bed core, fresh pebbles with large k-inf in the upper part of the core leads to an excessively high axial power peaking factor. An attempt has been done to minimize axial power peaking through controling axial k-inf distribution by adding burnable poison into the fuel pebbles.