Title:
【発明の名称】燃料集合体及び原子炉の炉心並びに下部タイプレ―ト
Document Type and Number:
Japanese Patent JP2520181
Kind Code:
B2
Abstract:
A fuel assembly comprises a plurality of fuel rods which contain nuclear fuel material inside, a lower tie plate which holds the lower end of the fuel rods and has a path inside to lead coolant between the fuel rods, and a channel box which encloses a bundle of the fuel rods. An orifice, in which a plurality of round rods are arranged to cross the coolant flow path, is installed in a through hole at a side wall of the lower tie plate by connecting to the side wall. Orifice coefficient of the orifice becomes large at small flow rate of coolant which supplied to the fuel assembly, and becomes small at large flow rate of coolant. By using the fuel assembly described above, void fraction in a gap region between fuel assemblies can be altered during beginning and end of an operation cycle of the nuclear reactor.
Inventors:
FUJIMURA KOJI
BETSUSHO TAISUKE
ISHII YOSHIHIKO
UCHIKAWA SADAO
YOSHIMOTO JUICHIRO
NAKAJIMA JUNJIRO
BETSUSHO TAISUKE
ISHII YOSHIHIKO
UCHIKAWA SADAO
YOSHIMOTO JUICHIRO
NAKAJIMA JUNJIRO
Application Number:
JP6479490A
Publication Date:
July 31, 1996
Filing Date:
March 15, 1990
Export Citation:
Assignee:
HITACHI LTD
International Classes:
G21C3/322; G21C7/27; G21C15/02; G21C3/33; (IPC1-7): G21C3/33; G21C3/322; G21C7/27
Domestic Patent References:
| JP53120089A | ||||
| JP21587A | ||||
| JP1292290A | ||||
| JP60177293A |
Attorney, Agent or Firm:
Kasuga