skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: THERMAL NUCLEAR REACTOR

Abstract

Nuclear reactors of the graphite moderated air cooled type in which canned slugs or rods of fissile material are employed are discussed. Such a reactor may be provided with a means for detecting dust particles in the exhausted air. The means employed are lengths of dust absorbent cord suspended in vertical holes in the shielding structure above each vertical coolant flow channel to hang in the path of the cooling air issuing from the channels, and associated spindles and drive motors for hauling the cords past detectors, such as Geiger counters, for inspecting the cords periodically. This design also enables detecting the individual channel in which a fault condition may have occurred.

Inventors:
;
Publication Date:
Research Org.:
Originating Research Org. not identified
OSTI Identifier:
4312359
Patent Number(s):
US 2807580
Assignee:
U.S. Atomic Energy Commission DTIE; NSA-12-004631
Resource Type:
Patent
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-58
Country of Publication:
United States
Language:
English
Subject:
PATENTS; ABSORPTION; AIR; COOLANTS; COUNTERS; DUSTS; FISSIONABLE MATERIALS; GEIGER-MUELLER COUNTERS; GRAPHITE MODERATOR; MOTORS; PARTICLES; PATENT; RADIATIONS; REACTORS; RODS; SHIELDING

Citation Formats

Fenning, F.W., and Jackson, R.F. THERMAL NUCLEAR REACTOR. United States: N. p., 1957. Web.
Fenning, F.W., & Jackson, R.F. THERMAL NUCLEAR REACTOR. United States.
Fenning, F.W., and Jackson, R.F. 1957. "THERMAL NUCLEAR REACTOR". United States. doi:.
@article{osti_4312359,
title = {THERMAL NUCLEAR REACTOR},
author = {Fenning, F.W. and Jackson, R.F.},
abstractNote = {Nuclear reactors of the graphite moderated air cooled type in which canned slugs or rods of fissile material are employed are discussed. Such a reactor may be provided with a means for detecting dust particles in the exhausted air. The means employed are lengths of dust absorbent cord suspended in vertical holes in the shielding structure above each vertical coolant flow channel to hang in the path of the cooling air issuing from the channels, and associated spindles and drive motors for hauling the cords past detectors, such as Geiger counters, for inspecting the cords periodically. This design also enables detecting the individual channel in which a fault condition may have occurred.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1957,
month = 9
}
  • This patent describes a method of limiting the movement of a thermal shield of a nuclear reactor. It comprises: machining at least four (4) pockets in upper portions of a thermal shield circumferentially about a core barrel of a nuclear reactor to receive key-wave inserts; tapping bolt holes in the pockets of the thermal shield to receive bolts; positioning key-wave inserts into the pockets of the thermal shield to be bolted in place with the bolt holes; machining dowel holes at least partially through the positioned key-way inserts and the thermal shield to receive dowel pins; positioning dowel pins inmore » the dowel holes in the key-way insert and thermal shield to tangentially restrain movement of the thermal shield relative to the core barrel; sliding limiter keys into the key-way inserts and bolting the limiter keys to the core barrel to tangentially restrain movement of the thermal shield relative and the core barrel while allowing radial and axial movement of the thermal shield relative to the core barrel; machining dowel holes through the limiter key and at least partially through the core barrel to receive dowel pins; positioning dowel pins in the dowel holes in the limiter key and core barrel to restrain tangential movement of the thermal shield relative to the core barrel of the nuclear reactor.« less
  • A process for controlling the reactivity of a thermal reactor consists in incorporating in the moderator a material in which the neutron capture cross section changes with the temperature and shows a resonance at a temperature higher than the reactor working temperature, so that the increase in absorption with increasing working temperature is sufficient to ensure the stability of the chain reaction in the proximity of the working temperature. Preferably the incorporated material consists of indium or rhodium in a powdery form mixed with the uranium and incorporated in the graphite moderator. According to another embodiment the indium or rhodiummore » is used in the form of a carbide. (NPO)« less