Fuel assembly and thimble screw of the same

Details Fuel assembly and thimble screw of the same Fuel assembly and thimble screw of the same

2007-08-14

2007-08-14

Colbert, Ella (Department: 3694)

Induced nuclear reactions: processes, systems, and elements

Fuel component structure

Plural fuel segments or elements

C376S207000, C376S434000, C376S225000

Reexamination Certificate

active

10673248

ABSTRACT:
A fuel assembly includes a bottom nozzle set on a lower core plate of a nuclear reactor, a top nozzle with a hold down spring to urge the bottom nozzle against the lower core plate, guide thimbles which guide control rods, having passed through the top nozzle, toward the lower core plate, a dashpot formed on each of the guide thimbles to reduce the fall velocity of a corresponding one of the control rods, a thimble screw which connects each of the guide thimbles to the bottom nozzle, and a drain hole formed to extend through each of the thimble screw. The dashpot has a large-diameter portion with substantially the same diameter as that of each of the guide thimbles. The diameter d of the drain hole falls within a range of 0.04 D<d<0.08 D where D is an inner diameter of the large-diameter portion.

REFERENCES:
patent: 3562109 (1971-02-01), Bezold et al.
patent: 4668469 (1987-05-01), Widener
patent: 4826648 (1989-05-01), Savery
patent: 4828791 (1989-05-01), DeMario
patent: 4996021 (1991-02-01), Bryan
patent: 5068083 (1991-11-01), John, Jr. et al.
patent: 5100608 (1992-03-01), Konomura et al.
patent: 5232655 (1993-08-01), Verdier
patent: 5606583 (1997-02-01), Verdier
patent: 5663993 (1997-09-01), Danielson et al.
patent: 5852644 (1998-12-01), Brosset et al.
patent: 6226343 (2001-05-01), Frederickson et al.
patent: 6246741 (2001-06-01), Nunokawa et al.
patent: 0 895 248 (1999-02-01), None
patent: 0 971 364 (2000-01-01), None
patent: 2002-40182 (2002-02-01), None
Derwent Publications, XP-002199113, JP 61-217795, Sep. 27, 1986.
Derwent Publications, XP-002199114, JP 61-217796, Sep. 27, 1986.
Patent Abstracts of Japan, JP 08-189981, Jul. 23, 1996.
Patent Abstracts of Japan, JP 02-055994, Feb. 26, 1990.
Patent Abstracts of Japan, JP 10-123274, May 15, 1998.

Affiliated with

Also associated with

Rating

Fuel assembly and thimble screw of the same does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Fuel assembly and thimble screw of the same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fuel assembly and thimble screw of the same will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3854006