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Nuclear fuel rod straightness measuring system and method
| Details |
Inventors: Parker, Merle A.; Ahmed, Hassan J.;
Assignee: Westinghouse Electric Corp. (Pittsburgh, PA)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
A rod straightness measuring system and method. A rod, such as a nuclear fuel rod, is supported and rotated in such a manner that if the rod were straight, it would be rotated about its longitudinal axis and remain straight without transverse translational motion, and in such a manner that if the rod were cambered, it would remain so cambered while supported and rotated. A multiplicity of separated and fixed range finders are placed apart from and directed towards the rod so that they would be directed perpendicular to a straight rod's longitudinal axis. The range finders measure the distance to the rotating rod. Differences in maximum and minimum measurements for each range finder indicate the degree of straightness of the rod. In a preferred system and method, the range finders are placed at known distances from a straight rod, and differences in distance measurements from the known distances for each range finder indicate the degree of rod straightness. |
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DETAILED DESCRIPTION Briefly stated, the invention is directed towards a rod straightness measuring system which has a rod support mechanism, a rod rotation apparatus, multiple range finders, and a difference calculating device.
The rod support mechanism supports the rod in such a manner that a straight rod would remain straight without transverse translational movement while supported and if rotated about its longitudinal axis, and a cambered rod would remain so cambered while supported and if rotated.
The rod rotation apparatus rotates the rod in such a manner that a straight rod would be rotated about its longitudinal axis.
The range finders are fixedly-positioned and separated from each other and the rod, are pointed towards the rod, and measure the distance to the rod during the rod's rotation, all in such a manner that each range finder would be pointed perpendicular to the longitudinal axis of, and be located at a known distance from, a straight rod.
The difference calculating device calculates, for each of the range finders, the differences in its distance measurements from the known distance of that range finder to a straight rod.
These differences show the comparative straightness of the rod (or to state it inversely, the differences express the extent of the camber of the rod).
In another embodiment of the invention, the difference calculating device calculates for each of the range finders the difference between the maximum and minimum of its distance measurements as an indication of rod straightness.
In this embodiment, it is not necessary to know the distances at which the range finders are located from a straight rod.
This embodiment is otherwise identical with the one previously described in the preceding paragraph.
In a preferred rod straightness measuring system, the rod is a nuclear fuel rod which is supported from underneath in such a manner that a straight rod will be horizontally supported, and which is rotated from one of its ends.
The invention is also directed towards a method for measuring the straightness of a rod
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