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Title: Apparatus and method for closed-loop control of reactor power in minimum time

Abstract

Closed-loop control law for altering the power level of nuclear reactors in a safe manner and without overshoot and in minimum time. Apparatus is provided for moving a fast-acting control element such as a control rod or a control drum for altering the nuclear reactor power level. A computer computes at short time intervals either the function: .rho.=(.beta.-.rho.).omega.-.lambda..sub.e '.rho.-.SIGMA..beta..sub.i (.lambda..sub.i -.lambda..sub.e ')+l* .omega.+l* [.omega..sup.2 +.lambda..sub.e '.omega.] or the function: .rho.=(.beta.-.rho.).omega.-.lambda..sub.e .rho.-(.lambda..sub.e /.lambda..sub.e)(.beta.-.rho.)+l* .omega.+l* [.omega..sup.2 +.lambda..sub.e .omega.-(.lambda..sub.e /.lambda..sub.e).omega.] These functions each specify the rate of change of reactivity that is necessary to achieve a specified rate of change of reactor power. The direction and speed of motion of the control element is altered so as to provide the rate of reactivity change calculated using either or both of these functions thereby resulting in the attainment of a new power level without overshoot and in minimum time. These functions are computed at intervals of approximately 0.01-1.0 seconds depending on the specific application.

Inventors:
 [1]
  1. (72 Paul Revere Rd., Needham Heights, MA 02194)
Issue Date:
OSTI Identifier:
866761
Patent Number(s):
4781881
Application Number:
07/000,472
Assignee:
Bernard, Jr., John A. (72 Paul Revere Rd., Needham Heights, MA 02194) OSTI
DOE Contract Number:  
01-2763
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
apparatus; method; closed-loop; control; reactor; power; minimum; time; law; altering; level; nuclear; reactors; safe; manner; overshoot; provided; moving; fast-acting; element; rod; drum; computer; computes; intervals; function; rho; beta; omega; lambda; sigma; functions; specify; rate; change; reactivity; achieve; specified; direction; speed; motion; altered; provide; calculated; resulting; attainment; computed; approximately; 01-1; depending; specific; application; control element; nuclear reactors; power level; control rod; nuclear reactor; time interval; specific application; time intervals; reactor power; minimum time; closed-loop control; safe manner; control law; loop control; /376/976/

Citation Formats

Bernard, Jr., John A. Apparatus and method for closed-loop control of reactor power in minimum time. United States: N. p., 1988. Web.
Bernard, Jr., John A. Apparatus and method for closed-loop control of reactor power in minimum time. United States.
Bernard, Jr., John A. Tue . "Apparatus and method for closed-loop control of reactor power in minimum time". United States. https://www.osti.gov/servlets/purl/866761.
@article{osti_866761,
title = {Apparatus and method for closed-loop control of reactor power in minimum time},
author = {Bernard, Jr., John A.},
abstractNote = {Closed-loop control law for altering the power level of nuclear reactors in a safe manner and without overshoot and in minimum time. Apparatus is provided for moving a fast-acting control element such as a control rod or a control drum for altering the nuclear reactor power level. A computer computes at short time intervals either the function: .rho.=(.beta.-.rho.).omega.-.lambda..sub.e '.rho.-.SIGMA..beta..sub.i (.lambda..sub.i -.lambda..sub.e ')+l* .omega.+l* [.omega..sup.2 +.lambda..sub.e '.omega.] or the function: .rho.=(.beta.-.rho.).omega.-.lambda..sub.e .rho.-(.lambda..sub.e /.lambda..sub.e)(.beta.-.rho.)+l* .omega.+l* [.omega..sup.2 +.lambda..sub.e .omega.-(.lambda..sub.e /.lambda..sub.e).omega.] These functions each specify the rate of change of reactivity that is necessary to achieve a specified rate of change of reactor power. The direction and speed of motion of the control element is altered so as to provide the rate of reactivity change calculated using either or both of these functions thereby resulting in the attainment of a new power level without overshoot and in minimum time. These functions are computed at intervals of approximately 0.01-1.0 seconds depending on the specific application.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {11}
}

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