Fuel assembly for nuclear reactor

Details Fuel assembly for nuclear reactor Fuel assembly for nuclear reactor

1988-08-24

1990-11-06

Walsh, Donald P.

Induced nuclear reactions: processes, systems, and elements

Fuel component structure

Plural fuel segments or elements

376419, G21C 330

Patent

active

049684795

ABSTRACT:
A fuel assembly for a nuclear reactor includes a number of fuel rods filled with a fuel material. A water rod having a cross sectional area larger than that of each fuel rod is disposed at substantially the central portion of the fuel assembly. The fuel rods include first fuel rods having a whole effective fuel zone filled with a fuel material throughout the entire length thereof and second fuel rods each having an interposed zone in which enrichment of a fissile nuclide is significantly reduced or the fissile nuclide does not exist at all. The second fuel rods are arranged so as to surround the water rod so that the interposed zones are positioned on an axial level including a portion at which subcriticality is made small at a period in which maintenance of reactor shut-down margine is made difficult during the reactor operation period. The water rod may be provided with a lower portion having a cross sectional area smaller than that of an upper portion and short fuel rods are disposed so as to surround the lower portion of the water rod.

REFERENCES:
patent: 4280874 (1981-07-01), Kawai
patent: 4683113 (1987-07-01), Mochida
patent: 4777016 (1988-10-01), Yoshioka

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