Claims
- 1. A fuel assembly for being loaded into a reactor core wherein a control rod-side water gap width and an opposite-side water gap width are almost equal to each other, comprising:a fuel bundle having a plurality of fuel rods arranged in a square lattice pattern and at least one neutron moderator rod, each fuel rod being filled with nuclear fuel pellets; an upper tie plate and a lower tie plate holding upper end portions and lower end portions of said fuel rods respectively; and means for fixing a channel box covering said fuel bundle to one corner of said upper tie plate by a channel fastener, a center of said at least one neutron moderator rod being shifted toward said one corner, away from a cross sectional center of the fuel assembly, wherein said plurality of fuel rods include a plurality of short-length fuel rods having a shorter active fuel length than remaining fuel rods, the number of said short-length fuel rods being arranged in one diagonally divided half area opposite to said one corner is larger than that in the other diagonally divided half area.
- 2. A fuel assembly according to claim 1, wherein the fuel assembly is divided into a first region including said one corner and a second region by a diagonal line in a cross section, and an average uranium enrichment of the fuel rods in said second region is higher than that of the fuel rods in said first region.
Priority Claims (1)
Number |
Date |
Country |
Kind |
10-185912 |
Jul 1998 |
JP |
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Parent Case Info
This is a divisional application of U.S. Ser. No. 09/335,694, filed Jun. 18, 1999, now U.S. Pat. No. 6,434,210.
US Referenced Citations (10)
Foreign Referenced Citations (2)
Number |
Date |
Country |
64-31091 |
Feb 1989 |
JP |
8-285977 |
Nov 1996 |
JP |