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1. (WO2017149864) FUEL ASSEMBLY AND REACTOR CORE LOADED WITH SAME

Pub. No.:    WO/2017/149864    International Application No.:    PCT/JP2016/084878
Publication Date: Sat Sep 09 01:59:59 CEST 2017 International Filing Date: Sat Nov 26 00:59:59 CET 2016
IPC: G21C 3/328
G21C 3/326
Applicants: HITACHI-GE NUCLEAR ENERGY, LTD.
日立GEニュークリア・エナジー株式会社
Inventors: ONO Michitaka
小野 道隆
MITSUYASU Takeshi
光安 岳
AOYAMA Motoo
青山 肇男
Title: FUEL ASSEMBLY AND REACTOR CORE LOADED WITH SAME
Abstract:
Provided are: a fuel assembly with which the absolute value of void coefficient can be inhibited from increasing while maintaining a desired fuel loading amount; and a reactor core loaded with the fuel assembly. The fuel assembly 1 includes first fuel rods 51 containing a burnable poison and second fuel rods (31a to 31c) containing no burnable poison, the first and second fuel rods having been bundled and housed in a channel box 4, wherein the first fuel rods 51 each have, in the upper end of the active fuel part, an active-fuel-part upper end region containing no burnable poison, the average enrichment in these active-fuel-part upper end regions, which contain no burnable poison, and the active-fuel-part upper end regions of the second fuel rods is 2.0-2.5 wt%, and the proportion of the length of each active-fuel-part upper end region to the axial-direction length of the active fuel part is 0.16-0.21.