초록 ▼

A fuel assembly of the present invention comprises fuel rods which are arranged in 9 rows and 9 columns (9×9) in a channel box. The channel box has a width L between outer walls thereof and a width D between inner walls thereof, both of which satisfy the following equation: 0.12≤(P-L)/D wherein P de

A fuel assembly of the present invention comprises fuel rods which are arranged in 9 rows and 9 columns (9×9) in a channel box. The channel box has a width L between outer walls thereof and a width D between inner walls thereof, both of which satisfy the following equation: 0.12≤(P-L)/D wherein P denotes the fuel assembly pitch in a reactor core. A sufficient cold shutdown margin for a reactor core can be secured by determining the widths L and D so as to satisfy the above-described equation, even if the average enrichment of the fuel assembly is increased to 4 wt % or more.

대표청구항 ▼

A fuel assembly to be loaded in a reactor core with a pitch P from the other ones, said fuel assembly comprising: a plurality of fuel rods; a water rod disposed within said fuel rods; and a channel box surrounding the bundle of said fuel rods, said channel box having a width L between outer walls th

A fuel assembly to be loaded in a reactor core with a pitch P from the other ones, said fuel assembly comprising: a plurality of fuel rods; a water rod disposed within said fuel rods; and a channel box surrounding the bundle of said fuel rods, said channel box having a width L between outer walls thereof and a width D between inner walls thereof, both of which satisfy the following equation: 0.12≤(P-L)/D.