	US 12,112,857 B2
	Light water reactor uranium fuel assembly and operation method of nuclear fuel cycle
Kouji Hiraiwa, Chigasaki (JP); Kenichi Yoshioka, Yokohama (JP); Rei Kimura, Setagaya (JP); Satoshi Wada, Yokohama (JP); and Tsukasa Sugita, Yokohama (JP)
Assigned to KABUSHIKI KAISHA TOSHIBA, Tokyo (JP); and TOSHIBA ENERGY SYSTEMS & SOLUTIONS CORPORATION, Kawasaki (JP)
Filed by KABUSHIKI KAISHA TOSHIBA, Tokyo (JP); and TOSHIBA ENERGY SYSTEMS & SOLUTIONS CORPORATION, Kawasaki (JP)
Filed on Jan. 28, 2022, as Appl. No. 17/587,315.
Claims priority of application No. 2021-048217 (JP), filed on Mar. 23, 2021.
Prior Publication US 2022/0328204 A1, Oct. 13, 2022
Int. Cl. G21C 3/32 (2006.01); G21C 19/32 (2006.01); G21C 19/48 (2006.01); G21C 3/326 (2006.01)

CPC G21C 19/32 (2013.01) [G21C 19/48 (2013.01); G21C 3/326 (2013.01)]

1 Claim

1. A fresh fuel assembly for a light water reactor, comprising:

a plurality of fuel rods bundled together, including uranium fuel rods and poison rods,

wherein the uranium fuel rods contain fissile uranium and americium reprocessed from spent fuel and do not contain a neutron poison, and

wherein the poison rods contain both uranium and a neutron poison;

wherein each of the uranium fuel rods contains a wt. % of americium-241 that is:

smaller than −0.006e2+0.12e−0.43 when the uranium enrichment e is 5 wt. % or more, and

smaller than −0.000356e+0.00357 when the uranium enrichment is 4.2 wt. % or more and less than 5.0 wt. %.