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Title: Nuclear reactor control column

Abstract

The nuclear reactor control column comprises a column disposed within the nuclear reactor core having a variable cross-section hollow channel and containing balls whose vertical location is determined by the flow of the reactor coolant through the column. The control column is divided into three basic sections wherein each of the sections has a different cross-sectional area. The uppermost section of the control column has the greatest cross-sectional area, the intermediate section of the control column has the smallest cross-sectional area, and the lowermost section of the control column has the intermediate cross-sectional area. In this manner, the area of the uppermost section can be established such that when the reactor coolant is flowing under normal conditions therethrough, the absorber balls will be lifted and suspended in a fluidized bed manner in the upper section. However, when the reactor coolant flow falls below a predetermined value, the absorber balls will fall through the intermediate section and into the lowermost section, thereby reducing the reactivity of the reactor core and shutting down the reactor.

Inventors:
 [1]
  1. (Plum Borough, PA)
Publication Date:
Research Org.:
Westinghouse Electric Corp
OSTI Identifier:
864300
Patent Number(s):
US 4343764
Assignee:
United States of America as represented by United States (Washington, DC) OSTI
DOE Contract Number:
EY-76-C-02-3045
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
nuclear; reactor; control; column; comprises; disposed; core; variable; cross-section; hollow; channel; containing; balls; vertical; location; determined; flow; coolant; divided; basic; sections; cross-sectional; uppermost; section; intermediate; lowermost; manner; established; flowing; normal; conditions; therethrough; absorber; lifted; suspended; fluidized; bed; upper; falls; below; predetermined; value; fall; reducing; reactivity; shutting; reactor control; reactor coolant; fluidized bed; nuclear reactor; reactor core; coolant flow; predetermined value; intermediate section; control column; upper section; column disposed; normal conditions; normal condition; column comprises; falls below; vertical location; hollow channel; /376/976/

Citation Formats

Bachovchin, Dennis M. Nuclear reactor control column. United States: N. p., 1982. Web.
Bachovchin, Dennis M. Nuclear reactor control column. United States.
Bachovchin, Dennis M. 1982. "Nuclear reactor control column". United States. doi:. https://www.osti.gov/servlets/purl/864300.
@article{osti_864300,
title = {Nuclear reactor control column},
author = {Bachovchin, Dennis M.},
abstractNote = {The nuclear reactor control column comprises a column disposed within the nuclear reactor core having a variable cross-section hollow channel and containing balls whose vertical location is determined by the flow of the reactor coolant through the column. The control column is divided into three basic sections wherein each of the sections has a different cross-sectional area. The uppermost section of the control column has the greatest cross-sectional area, the intermediate section of the control column has the smallest cross-sectional area, and the lowermost section of the control column has the intermediate cross-sectional area. In this manner, the area of the uppermost section can be established such that when the reactor coolant is flowing under normal conditions therethrough, the absorber balls will be lifted and suspended in a fluidized bed manner in the upper section. However, when the reactor coolant flow falls below a predetermined value, the absorber balls will fall through the intermediate section and into the lowermost section, thereby reducing the reactivity of the reactor core and shutting down the reactor.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1982,
month = 1
}

Patent:

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  • The nuclear reactor control column comprises a column disposed within the nuclear reactor core having a variable cross-section hollow channel and containing balls whose vertical location is determined by the flow of the reactor coolant through the column. The control column is divided into three basic sections wherein each of the sections has a different cross-sectional area. The uppermost section of the control column has the greatest crosssectional area, the intermediate section of the control column has the smallest cross-sectional area, and the lowermost section of the control column has the intermediate cross-sectional area. In this manner, the area ofmore » the uppermost section can be established such that when the reactor coolant is flowing under normal conditions therethrough, the absorber balls will be lifted and suspended in a fluidized bed manner in the upper section. However, when the reactor coolant flow falls below a predetermined value, the absorber balls will fall through the intermediate section and into the lowermost section, thereby reducing the reactivity of the reactor core and shutting down the reactor.« less
  • This paper describes an improved internals assembly for a nuclear reactor. It comprises: an upper support plate and an upper core plate, each of which includes apertures for conducting control rod assemblies into and out of fuel assemblies, each of the apertures of the upper support plate being aligned with one of the apertures of the upper core plate, wherein the improvement comprises at least one elongated and tubular support and guide tube member whose ends are connected between mutually aligned apertures in the support and core plates for both suspending the core plate from the support plate and formore » receiving and guiding a control rod assembly through the pair of mutually aligned apertures.« less