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Title: Improved nuclear fuel assembly grid spacer

Abstract

An improved fuel assembly grid spacer and method of retaining the basic fuel rod support elements in position within the fuel assembly containment channel. The improvement involves attachment of the grids to the hexagonal channel and of forming the basic fuel rod support element into a grid structure, which provides a design which is insensitive to potential channel distortion (ballooning) at high fluence levels. In addition the improved method eliminates problems associated with component fabrication and assembly.

Inventors:
 [1];  [2]
  1. (San Jose, CA)
  2. (Los Gatos, CA)
Publication Date:
OSTI Identifier:
862827
Patent Number(s):
US 4021300
Assignee:
United States of America as represented by United States Energy (Washington, DC) OSTI
DOE Contract Number:
AT(04-3)-893
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
improved; nuclear; fuel; assembly; grid; spacer; method; retaining; basic; rod; support; elements; position; containment; channel; improvement; involves; attachment; grids; hexagonal; forming; element; structure; provides; design; insensitive; potential; distortion; ballooning; fluence; levels; addition; eliminates; associated; component; fabrication; rod support; improved method; nuclear fuel; fuel assembly; fuel rod; improved fuel; support elements; support element; grid structure; improved nuclear; improvement involves; grid spacer; assembly grid; /376/976/

Citation Formats

Marshall, John, and Kaplan, Samuel. Improved nuclear fuel assembly grid spacer. United States: N. p., 1977. Web.
Marshall, John, & Kaplan, Samuel. Improved nuclear fuel assembly grid spacer. United States.
Marshall, John, and Kaplan, Samuel. 1977. "Improved nuclear fuel assembly grid spacer". United States. doi:. https://www.osti.gov/servlets/purl/862827.
@article{osti_862827,
title = {Improved nuclear fuel assembly grid spacer},
author = {Marshall, John and Kaplan, Samuel},
abstractNote = {An improved fuel assembly grid spacer and method of retaining the basic fuel rod support elements in position within the fuel assembly containment channel. The improvement involves attachment of the grids to the hexagonal channel and of forming the basic fuel rod support element into a grid structure, which provides a design which is insensitive to potential channel distortion (ballooning) at high fluence levels. In addition the improved method eliminates problems associated with component fabrication and assembly.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1977,
month = 1
}

Patent:

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  • Disclosed is an improved fuel assembly grid spacer and method of retaining the basic fuel rod support elements in position within the fuel assembly containment channel. The improvement involves attachment of the grids to the hexagonal channel and forming the basic fuel rod support element into a grid structure, which provides a design which is insensitive to potential channel distortion (ballooning) at high fluence levels. In addition the improved method eliminates problems associated with component fabrication and assembly.
  • A grid for the spacing of fuel rods in a nuclear reactor fuel assembly is described comprising interleaved grid straps arranged in an egg-crate configuration defining cells therein for the separate enclosure of each of the fuel rods, one of the cells having a longitudinal axis and having each of its associated grid straps with at least one generally rigid protrusion projecting into the one cell for the spacing of an associated enclosed fuel rod therein. The one cell's protrusions on a pair of non-opposing associated grid straps are generally closed to longitudinal coolant flow through the one cell andmore » with the one cell's remaining protrusions on the remaining associated grid straps generally open to longitudinal coolant flow through the one cell.« less