Fuel assembly and upper tie plate thereof

Details Fuel assembly and upper tie plate thereof Fuel assembly and upper tie plate thereof

1991-07-01

1993-03-09

Walsh, Donald P.

Induced nuclear reactions: processes, systems, and elements

Fuel component structure

Plural fuel segments or elements

376435, 376209, 376210, G21C 706

Patent

active

051924960

ABSTRACT:
The fuel assembly has fuel arrangement of a square lattice of 10 lines by 10 rows. Four water rods having a large diameter are arranged in central region of horizontal cross section wherein arrangement of 12 fuel rods is possible. The four water rods having a large diameter are so arranged adjacently in a circle as to form an internal between each other. First coolant flow path which is extended toward axial direction is formed by surrounded with the water rods having a large diameter. The first coolant flow path leads to third coolant flow path which is formed around the fuel rods through second coolant flow path which is the interval between the water rods having a large diameter.
The fuel assembly is able to optimize the moderator to fuel atom number density ratio and to reduce the pressure loss because a portion to be an excessively moderated region is utilized as the first coolant flow path.

REFERENCES:
patent: 4292128 (1981-09-01), Takeda et al.
patent: 4652426 (1987-03-01), Boyle et al.
patent: 4876062 (1989-10-01), Aoyama et al.
patent: 4968479 (1990-11-01), Ogiya et al.
patent: 5068082 (1991-11-01), Ueda et al.

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