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Title: Nuclear fuel pin scanner

Abstract

Systems and methods for inspection of nuclear fuel pins to determine fiss loading and uniformity. The system includes infeed mechanisms which stockpile, identify and install nuclear fuel pins into an irradiator. The irradiator provides extended activation times using an approximately cylindrical arrangement of numerous fuel pins. The fuel pins can be arranged in a magazine which is rotated about a longitudinal axis of rotation. A source of activating radiation is positioned equidistant from the fuel pins along the longitudinal axis of rotation. The source of activating radiation is preferably oscillated along the axis to uniformly activate the fuel pins. A detector is provided downstream of the irradiator. The detector uses a plurality of detector elements arranged in an axial array. Each detector element inspects a segment of the fuel pin. The activated fuel pin being inspected in the detector is oscillated repeatedly over a distance equal to the spacing between adjacent detector elements, thereby multiplying the effective time available for detecting radiation emissions from the activated fuel pin.

Inventors:
 [1];  [2]
  1. (Friendswood, TX)
  2. (La Jolla, CA)
Publication Date:
Research Org.:
IRT Corporation
OSTI Identifier:
866160
Patent Number(s):
US 4647420
Application Number:
06/713,165
Assignee:
United States of America as represented by Department of Energy (Washington, DC) OSTI
DOE Contract Number:
Y6E-S44-36837
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
nuclear; fuel; scanner; systems; methods; inspection; pins; determine; fiss; loading; uniformity; infeed; mechanisms; stockpile; identify; install; irradiator; provides; extended; activation; times; approximately; cylindrical; arrangement; numerous; arranged; magazine; rotated; longitudinal; axis; rotation; source; activating; radiation; positioned; equidistant; preferably; oscillated; uniformly; activate; detector; provided; downstream; plurality; elements; axial; array; element; inspects; segment; activated; inspected; repeatedly; distance; equal; spacing; adjacent; multiplying; effective; time; available; detecting; emissions; detecting radiation; nuclear fuel; longitudinal axis; fuel pins; distance equal; detector element; elements arranged; detector elements; feed mechanism; axial array; /376/976/

Citation Formats

Bramblett, Richard L., and Preskitt, Charles A.. Nuclear fuel pin scanner. United States: N. p., 1987. Web.
Bramblett, Richard L., & Preskitt, Charles A.. Nuclear fuel pin scanner. United States.
Bramblett, Richard L., and Preskitt, Charles A.. Tue . "Nuclear fuel pin scanner". United States. doi:. https://www.osti.gov/servlets/purl/866160.
@article{osti_866160,
title = {Nuclear fuel pin scanner},
author = {Bramblett, Richard L. and Preskitt, Charles A.},
abstractNote = {Systems and methods for inspection of nuclear fuel pins to determine fiss loading and uniformity. The system includes infeed mechanisms which stockpile, identify and install nuclear fuel pins into an irradiator. The irradiator provides extended activation times using an approximately cylindrical arrangement of numerous fuel pins. The fuel pins can be arranged in a magazine which is rotated about a longitudinal axis of rotation. A source of activating radiation is positioned equidistant from the fuel pins along the longitudinal axis of rotation. The source of activating radiation is preferably oscillated along the axis to uniformly activate the fuel pins. A detector is provided downstream of the irradiator. The detector uses a plurality of detector elements arranged in an axial array. Each detector element inspects a segment of the fuel pin. The activated fuel pin being inspected in the detector is oscillated repeatedly over a distance equal to the spacing between adjacent detector elements, thereby multiplying the effective time available for detecting radiation emissions from the activated fuel pin.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Mar 03 00:00:00 EST 1987},
month = {Tue Mar 03 00:00:00 EST 1987}
}

Patent:

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  • A nuclear fuel pin scanner system is described for inspecting nuclear fuel pins at a throughput rate to determine the uniformity and amount of fissile material contained in the fuel pin, comprising: a rotary irradiator having a source of activating radiation located centrally thereof, the irradiator having a plurality of circumferentially spaced positions thereabout for supporting fuel pins in radially spaced relation to the source of activating radiation; means for feeding and discharging the fuel pins singly into and from the irradiator at the throughput rate; means for rotating the irradiator and fuel pins contained therein about the source ofmore » activating radiation whereby each fuel pin is irradiated for an extended period of time relative to the throughput rate; and detector means downstream of the irradiator comprising an array of axially spaced radiation detectors for detecting radiation from segments, respectively, of each fuel pin during oscillatory movement of the fuel pin relative to the detector means to achieve an effective total scanning time for the pin equal to a detection period times the number of segments.« less
  • Systems and methods for inspection of nuclear fuel pins to determine fissile loading and uniformity. The system includes infeed mechanisms which stockpile, identify and install nuclear fuel pins into an irradiator. The irradiator provides extended activation times using an approximately cylindrical arrangement of numerous fuel pins. The fuel pins can be arranged in a magazine which is rotated about a longitudinal axis of rotation. A source of activating radiation is positioned equidistant from the fuel pins along the longitudinal axis of rotation. The source of activating radiation is preferably oscillated along the axis to uniformly activate the fuel pins. Amore » detector is provided downstream of the irradiator. The detector uses a plurality of detector elements arranged in an axial array. Each detector element inspects a segment of the fuel pin. The activated fuel pin being inspected in the detector is oscillated repeatedly over a distance equal to the spacing between adjacent detector elements, thereby multiplying the effective time available for detecting radiation emissions from the activated pins.« less
  • A portable, hand-held apparatus is described for optically scanning indicia imprinted about a planar end face of an article having an outer wall surface, the apparatus comprising: a supporting frame; light detector means fixed to the frame for digitizing light patterns directed thereto; indexing means on the frame for engaging the planar end face and locating the end face in a preselected focal plane on the frame. The indexing means has an inner wall surface complementary to the article wall surface for disposition thereabout and terminates in an end portion beyond the planar end face. The inner wall surface hasmore » a radially inwardly extending shoulder spaced from the end portion and engageable with the planar end face; light means directed onto the preselected focal plane; optical means mounted on the frame about a central axis, the optical means being optically interposed between the indexing means and the light detector means for directing reflected light from the preselected focal plane to the light detector means and including a dove prism centrally aligned along the central axis; and means for selectively rotating the dove prism relative to the frame about the central axis to thereby rotate the image from the focal plane as transmitted to the light detector means.« less
  • An optical scanner for indicia arranged in a focal plane at a cylindrical outside surface by use of an optical system including a rotatable dove prism. The dove prism transmits a rotating image of an encircled cylindrical surface area to a stationary photodiode array.
  • An optical scanner for indicia arranged in a focal plane perpendicular to an optical system including a rotatable dove prism. The dove prism transmits a rotating image to a stationary photodiode array.