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

Title: NEUTRONIC REACTOR CONTROL

Abstract

Methods of controlling reactors are presented. Specifically, a plurality of neutron absorber members are adjustably disposed in the reactor core at different distances from the center thereof. The absorber members extend into the core from opposite faces thereof and are operated by motive means coupled in a manner to simultaneously withdraw at least one of the absorber members while inserting one of the other absorber members. This feature effects fine control of the neutron reproduction ratio by varying the total volume of the reactor effective in developing the neutronic reaction.

Inventors:
Publication Date:
Research Org.:
Originating Research Org. not identified
OSTI Identifier:
4282238
Patent Number(s):
US 2856336
Assignee:
U.S. Atomic Energy Commission DTIE; NSA-13-008362
Resource Type:
Patent
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-59
Country of Publication:
United States
Language:
English
Subject:
PATENTS; ABSORPTION; CONFIGURATION; CONTROL; CONTROL SYSTEMS; COUPLING; DISTANCE; INTERACTIONS; MOTION; NEUTRONS; NUCLEAR REACTIONS; OPERATION; REACTOR CORE; REACTORS; VARIATIONS; VOLUME

Citation Formats

Metcalf, H.E.. NEUTRONIC REACTOR CONTROL. United States: N. p., 1958. Web.
Metcalf, H.E.. NEUTRONIC REACTOR CONTROL. United States.
Metcalf, H.E.. 1958. "NEUTRONIC REACTOR CONTROL". United States. doi:.
@article{osti_4282238,
title = {NEUTRONIC REACTOR CONTROL},
author = {Metcalf, H.E.},
abstractNote = {Methods of controlling reactors are presented. Specifically, a plurality of neutron absorber members are adjustably disposed in the reactor core at different distances from the center thereof. The absorber members extend into the core from opposite faces thereof and are operated by motive means coupled in a manner to simultaneously withdraw at least one of the absorber members while inserting one of the other absorber members. This feature effects fine control of the neutron reproduction ratio by varying the total volume of the reactor effective in developing the neutronic reaction.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1958,
month =
}
  • A neutronic reactor comprising an active portion containing material fissionable by neutrons of thermal energy, means to control a neutronic chain reaction within the reactor comprising a safety device and a regulating device, a safety device including means defining a vertical channel extending into the reactor from an aperture in the upper surface of the reactor, a rod containing neutron-absorbing materials slidably disposed within the channel, means for maintaining the safety rod in a withdrawn position relative to the active portion of the reactor including means for releasing said rod on actuation thereof, a hopper mounted above the active portionmore » of the reactor having a door disposed at the bottom of the hopper opening into the vertical channel, a plurality of bodies of neutron-absorbing materials disposed within the hopper, and means responsive to the failure of the safety rod on actuation thereof to enter the active portion of the reactor for opening the door in the hopper.« less
  • A reactor control rod formed from a compacted powder dispersion is patented. The rod consists of titanium sheathed with a cladding alloy. The cladding alloy contains 1.3% to 1.6% by weight of tin, 0.07% to 0.12% by weight of chromium, 0.04% to 0.08% by weight of nickel, 0.09% to 0.16% by weight of iron, carbon not exceeding 0.05%, less than 0.5% by weight of incidental impurities, and the balance zirconium.
  • A novel composite neutronic reactor control element is offered. The element comprises a multiplicity of sections arranged in end-to-end relationship, each of the sections having a markedly different neutron-reactive characteristic. For example, a three-section control element could contain absorber, moderator, and fuel sections. By moving such an element longitudinally through a reactor core, reactivity is decreased by the absorber, increased slightly by the moderator, or increased substantially by the fuel. Thus, control over a wide reactivity range is provided.
  • A device for the control of a reactor is designed which affects the neutron flux in a uniform way and does not require much space outside the core for withdrawal of the control elements. The device comprises at least one pair of control elements arranged on opposite sides of the reactor and coupled together so that on operation of the device, they move simultaneously in opposite directions. The control elements may comprise rods or an articulated series of small containers filled with a neutron absorber, and the coupling means may comprise cables or chains. (D.L.C.)
  • An apparatus is described for indicating the approach to prompt criticality of a neutronic reactor and comprises means for oscillating an absorber in the reactor, a detector for measuring neutron flux in the reactor, two channels into which the output of the detector can be directed, one of which includes a narrow band filter with band pass frequency equal to that of the oscillator, and means for indicating the ratio of the signal produced by the channel with the filter to the signal produced by the other channel, which constitutes an indication of the approach to prompt criticality.