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Title: Neutronic reactor construction

Abstract

1. A neutronic reactor comprising a moderator including horizontal layers formed of horizontal rows of graphite blocks, alternate layers of blocks having the rows extending in one direction, the remaining alternate layers having the rows extending transversely to the said one direction, alternate rows of blocks in one set of alternate layers having longitudinal ducts, the moderator further including slotted graphite tubes positioned in the ducts, the reactor further comprising an aluminum coolant tube positioned within the slotted tube in spaced relation thereto, bodies of thermal-neutron-fissionable material, and jackets enclosing the bodies and being formed of a corrosion-resistant material having a low neutron-capture cross section, the bodies and jackets being positioned within the coolant tube so that the jackets are spaced from the coolant tube.

Inventors:
 [1]
  1. (Fullerton, CA)
Publication Date:
Research Org.:
Atomics International. Div. of North American Aviation, Inc., Canoga Park, Calif.
OSTI Identifier:
862587
Patent Number(s):
US 3968007
Assignee:
United States of America as represented by United States Energy (Washington, DC) OSTI
DOE Contract Number:
AT(11-1)-GEN-8
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
neutronic; reactor; construction; comprising; moderator; including; horizontal; layers; formed; rows; graphite; blocks; alternate; extending; direction; remaining; transversely; set; longitudinal; ducts; slotted; tubes; positioned; aluminum; coolant; tube; spaced; relation; thereto; bodies; thermal-neutron-fissionable; material; jackets; enclosing; corrosion-resistant; neutron-capture; section; reactor comprising; resistant material; spaced relation; neutronic reactor; alternate layers; fissionable material; coolant tube; layers formed; relation thereto; tube positioned; tubes positioned; alternate rows; reactor construction; graphite blocks; corrosion-resistant material; remaining alternate; extending transversely; horizontal layers; horizontal rows; thermal-neutron-fissionable material; extending transverse; /376/976/

Citation Formats

Huston, Norman E. Neutronic reactor construction. United States: N. p., 1976. Web.
Huston, Norman E. Neutronic reactor construction. United States.
Huston, Norman E. 1976. "Neutronic reactor construction". United States. doi:. https://www.osti.gov/servlets/purl/862587.
@article{osti_862587,
title = {Neutronic reactor construction},
author = {Huston, Norman E.},
abstractNote = {1. A neutronic reactor comprising a moderator including horizontal layers formed of horizontal rows of graphite blocks, alternate layers of blocks having the rows extending in one direction, the remaining alternate layers having the rows extending transversely to the said one direction, alternate rows of blocks in one set of alternate layers having longitudinal ducts, the moderator further including slotted graphite tubes positioned in the ducts, the reactor further comprising an aluminum coolant tube positioned within the slotted tube in spaced relation thereto, bodies of thermal-neutron-fissionable material, and jackets enclosing the bodies and being formed of a corrosion-resistant material having a low neutron-capture cross section, the bodies and jackets being positioned within the coolant tube so that the jackets are spaced from the coolant tube.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1976,
month = 7
}

Patent:

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  • A method is given for operating a nuclear reactor having a negative coefficient of reactivity to compensate for the change in reactor reactivity due to the burn-up of the xenon peak following start-up of the reactor. When it is desired to start up the reactor within less than 72 hours after shutdown, the temperature of the reactor is lowered prior to start-up, and then gradually raised after start-up.
  • Test-hole construction is described for a reactor which provides safe and ready access to the neutron flux region for specimen materials which are to be irradiated therein. An elongated tubular thimble adapted to be inserted in the access hole through the wall of the reactor is constructed of aluminum and is provided with a plurality of holes parallel to the axis of the thimble for conveying the test specimens into position for irradiation, and a conduit for the circulation of coolant. A laminated shield formed of alternate layers of steel and pressed wood fiber is disposed lengthwise of the thimblemore » near the outer end thereof.« less
  • Reactors of the heterogeneous, graphite moderated, fluid cooled type and shielding and spacing plugs for the coolant channels thereof are reported. In this design, the coolant passages extend horizontally through the moderator structure, accommodating the fuel elements in abutting end-to-end relationship, and have access openings through the outer shield at one face of the reactor to facilitate loading of the fuel elements. In the outer ends of the channels which extend through the shields are provided spacers and shielding plugs designed to offer minimal reslstance to coolant fluid flow while preventing emanation of harmful radiation through the access openings whenmore » closed between loadings.« less
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  • A neutronic reactor is described comprising a moderator including horizontal layers formed of horizontal rows of graphite blocks, alternate layers of blocks having the rows extending in one direction, the remaining alternate layers having the rows extending transversely to the said one direction, alternate rows of blocks in one set of alternate layers having longitudinal ducts, the moderator further including slotted graphite tubes positioned in the ducts, the reactor further comprising an aluminum coolant tube positioned within the slotted tube in spaced relation thereto, bodies of thermal-neutron-fissionable material, and jackets enclosing the bodies and being formed of a corrosion-resistant materialmore » having a low neutron-capture cross section, the bodies and jackets being positioned within the coolant tube so that the jackets are spaced from the coolant tube. 2 claims, 9 figures.« less