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Title: Fission control system for nuclear reactor

Abstract

Control system for nuclear reactor comprises a first set of reactivity modifying rods fixed in a reactor core with their upper ends stepped in height across the core, and a second set of reactivity modifying rods movable vertically within the reactor core and having their lower ends stepped to correspond with the stepped arrangement of the first set of rods, pairs of the rods of the first and second sets being in coaxial alignment.

Inventors:
;
OSTI Identifier:
5445106
Application Number:
ON: DE84005909
Assignee:
EDB-84-028805
DOE Contract Number:
AC11-76PN00014
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; BREEDER REACTORS; REACTOR CONTROL SYSTEMS; DESIGN; CONTROL ELEMENTS; REACTIVITY; THORIUM OXIDES; ACTINIDE COMPOUNDS; CHALCOGENIDES; CONTROL SYSTEMS; OXIDES; OXYGEN COMPOUNDS; REACTOR COMPONENTS; REACTORS; THORIUM COMPOUNDS; 220400* - Nuclear Reactor Technology- Control Systems; 210500 - Power Reactors, Breeding

Citation Formats

Conley, G.H., and Estes, G.P. Fission control system for nuclear reactor. United States: N. p., Web.
Conley, G.H., & Estes, G.P. Fission control system for nuclear reactor. United States.
Conley, G.H., and Estes, G.P. . "Fission control system for nuclear reactor". United States. doi:.
@article{osti_5445106,
title = {Fission control system for nuclear reactor},
author = {Conley, G.H. and Estes, G.P.},
abstractNote = {Control system for nuclear reactor comprises a first set of reactivity modifying rods fixed in a reactor core with their upper ends stepped in height across the core, and a second set of reactivity modifying rods movable vertically within the reactor core and having their lower ends stepped to correspond with the stepped arrangement of the first set of rods, pairs of the rods of the first and second sets being in coaxial alignment.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {},
month = {}
}
  • A system for controlling the reactivity of a small fission reactor includes an elongated, flexible hollow tube in the general form of a helical coiled spring axially positioned around and outside of the reactor vessel in an annular space between the reactor vessel and a surrounding cylindrical-shaped neutron reflector. A neutron absorbing material is provided within the hollow tube with the rate of the reaction controlled by the extension and compression of the hollow tube, e.g., extension of the tube increases reactivity while its compression reduces reactivity, in varying the amount of neutron absorbing material disposed between the reactor vesselmore » and the neutron reflector. Conventional mechanical displacement means may be employed to control the coil density of the hollow tube as desired. In another embodiment, a plurality of flexible hollow tubes each containing a neutron absorber are positioned adjacent to one another in spaced relation around the periphery of the reactor vessel and inside the outer neutron reflector with reactivity controlled by the extension and compression of all or some of the coiled hollow tubes. Yet another embodiment of the invention envisions the neutron reflector in the form of an expandable coil spring positioned in an annular space between the reactor vessel and an outer neutron absorbing structure for controlling the neutron flux reflected back into the reactor vessel.« less
  • A system for controlling the reactivity of a small fission reactor includes an elongated, flexible hollow tube in the general form of a helical coiled spring axially positioned around and outside of the reactor vessel in an annular space between the reactor vessel and a surrounding cylindrical-shaped neutron reflector. A neutron absorbing material is provided within the hollow tube with the rate of the reaction controlled by the extension and compression of the hollow tube, e.g., extension of the tube increases reactivity while its compression reduces reactivity, in varying the amount of neutron absorbing material disposed between the reactor vesselmore » and the neutron reflector. Conventional mechanical displacement means may be employed to control the coil density of the hollow tube as desired.« less
  • This patent describes a system for controlling the reactivity of a fission reactor including a reactor core containing a liquid coolant in which fission reactions occur producing energetic neutrons which initiate and sustain the fission reactions. The system consists of: 1.) neutron reflecting means positioned around the reactor core in spaced relation so as to define a space for reflecting energetic neutrons which escape from the reactor core back into the reactor core for sustaining the fission reactions; 2.) a variable length control system positioned within the space between the reactor core and the neutron reflector for absorbing neutrons whichmore » escape from the reactor core. The control system includes at least one flexible, helically coiled control element positioned around the periphery of the reactor core; and 3.) displacement coupled to the control system for varying the length of the control system positioned between the reactor core and the neutron reflector in regulating the number of energetic neutrons absorbed and controlling the reactivity of the fission reactor.« less