Nuclear fuel sintered pellet having excellent impact resistance

Patent metadata

Field	Value
Publication number	US-2022310277-A1
Application number	US-202217699628-A
Country	US
Kind code	A1
Filing date	Mar 21, 2022
Priority date	Jan 24, 2018
Publication date	Sep 29, 2022
Grant date	—

Abstract

Proposed is a nuclear fuel pellet manufactured with UO2 powder and being in a cylindrical shape, the nuclear fuel pellet including: a dish (10) provided in a shape of a spherical groove having a predetermined curvature and a diameter of 4.8 to 5.2 mm at a center of each of top and bottom surfaces of the nuclear fuel pellet; a shoulder (20) provided in an annular plane along a rim of the dish (10); a first chamfer (310) provided along a rim of the shoulder (20) while being adjacent to the shoulder (20); and a second chamfer (320) provided along a rim of the first chamfer (310), wherein a width (SW) of the shoulder (20) is 0.4565 mm to 0.6565 mm, an angle between the first chamfer (310) and a horizontal plane is 2.0°, and an angle between the second chamfer (320) and the horizontal plane is 18.0°.

First claim

1 . A nuclear fuel pellet manufactured with UO 2 powder and having a cylindrical shape having a height of 9 mm to 13 mm and a horizontal sectional diameter of 8 mm to 8.5 mm, the nuclear fuel pellet comprising:
a dish ( 10 ) provided in a shape of a spherical groove having a predetermined curvature and a diameter of 4.8 to 5.2 mm at a center of each of a top surface and a bottom surface of the nuclear fuel pellet; a shoulder ( 20 ) provided in an annular plane along a rim of the dish ( 10 ); a first chamfer ( 310 ) provided along a rim of the shoulder ( 20 ) while being adjacent to the shoulder ( 20 ); and a second chamfer ( 320 ) provided along a rim of the first chamfer ( 310 ), wherein a width (SW) of the shoulder ( 20 ) is 0.4565 mm to 0.6565 mm, an angle between the first chamfer ( 310 ) and a horizontal plane is 2.0°, and an angle between the second chamfer ( 320 ) and the horizontal plane is 18.0°.

2 . The nuclear fuel pellet of claim 1 , wherein the nuclear fuel pellet is manufactured using a powder in which at least one of PuO 2 powder, Gd 2 O 3 powder, and ThO 2 powder is mixed with UO 2 powder.

3 . The nuclear pellet of claim 2 , wherein the nuclear fuel pellet is a molded object comprising UO 2 powder mixed with a pore former and a lubricant and being sintered.

4 . The nuclear pellet of claim 1 , wherein the dish ( 10 ) has a center depth of 0.22 mm to 0.26 mm, and a diameter of 4.70 mm to 4.80 mm.

5 . The nuclear pellet of claim 4 , wherein the dish ( 10 ) is configured to have a shape of double concentric circles provided by a second dish ( 120 ) having a predetermined diameter and a first dish ( 110 ) provided at a center of the second dish ( 120 ) and having a diameter smaller than the second dish ( 120 ).

6 . The nuclear pellet of claim 1 , wherein the width of the shoulder ( 20 ): a width of the first chamfer ( 310 ) is

0 . 4565:0.7565 to 0.6565:0.5565.

Assignees

• Kepco Nuclear Fuel Co Ltd

Inventors

• Na Yeon-Soo
• Lim Kwang-Young
• Jung Tae Sik
• Lee Seung-Jae
• Ju Min Jae

Classifications

• G21C3/047

  Pellet-clad interaction · CPC title

• G21C3/623 Primary

  Oxide fuels · CPC title

• G21C3/048 Primary

  Shape of pellets · CPC title

• C04B2235/3224

  Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide · CPC title

• G21C3/58 Primary

  Solid reactor fuel {Pellets made of fissile material} · CPC title