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Title: Self-actuating reactor shutdown system

Abstract

A control system for the automatic or self-actuated shutdown or "scram" of a nuclear reactor. The system is capable of initiating scram insertion by a signal from the plant protection system or by independent action directly sensing reactor conditions of low-flow or over-power. Self-actuation due to a loss of reactor coolant flow results from a decrease of pressure differential between the upper and lower ends of an absorber element. When the force due to this differential falls below the weight of the element, the element will fall by gravitational force to scram the reactor. Self-actuation due to high neutron flux is accomplished via a valve controlled by an electromagnet and a thermionic diode. In a reactor over-power, the diode will be heated to a change of state causing the electromagnet to be shorted thereby actuating the valve which provides the changed flow and pressure conditions required for scramming the absorber element.

Inventors:
 [1];  [2];  [3]
  1. San Jose, CA
  2. Livermore, CA
  3. Danville, CA
Publication Date:
Research Org.:
GENERAL ELECTRIC CO
OSTI Identifier:
866717
Patent Number(s):
US 4770845
Assignee:
United States of America as represented by United States (Washington, DC)
DOE Contract Number:  
AT03-76SF71032
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
self-actuating; reactor; shutdown; control; automatic; self-actuated; scram; nuclear; capable; initiating; insertion; signal; plant; protection; independent; action; directly; sensing; conditions; low-flow; over-power; self-actuation; due; loss; coolant; flow; results; decrease; pressure; differential; upper; absorber; element; force; falls; below; weight; fall; gravitational; neutron; flux; accomplished; via; valve; controlled; electromagnet; thermionic; diode; heated; change; causing; shorted; actuating; provides; changed; required; scramming; valve control; pressure conditions; reactor coolant; nuclear reactor; pressure differential; neutron flux; coolant flow; reactor shutdown; self-actuating reactor; reactor conditions; self-actuated shutdown; falls below; conditions required; gravitational force; actuated shutdown; absorber element; directly sensing; /376/310/313/337/374/976/

Citation Formats

Barrus, Donald M, Brummond, Willian A, and Peterson, Leslie F. Self-actuating reactor shutdown system. United States: N. p., 1988. Web.
Barrus, Donald M, Brummond, Willian A, & Peterson, Leslie F. Self-actuating reactor shutdown system. United States.
Barrus, Donald M, Brummond, Willian A, and Peterson, Leslie F. Fri . "Self-actuating reactor shutdown system". United States. https://www.osti.gov/servlets/purl/866717.
@article{osti_866717,
title = {Self-actuating reactor shutdown system},
author = {Barrus, Donald M and Brummond, Willian A and Peterson, Leslie F},
abstractNote = {A control system for the automatic or self-actuated shutdown or "scram" of a nuclear reactor. The system is capable of initiating scram insertion by a signal from the plant protection system or by independent action directly sensing reactor conditions of low-flow or over-power. Self-actuation due to a loss of reactor coolant flow results from a decrease of pressure differential between the upper and lower ends of an absorber element. When the force due to this differential falls below the weight of the element, the element will fall by gravitational force to scram the reactor. Self-actuation due to high neutron flux is accomplished via a valve controlled by an electromagnet and a thermionic diode. In a reactor over-power, the diode will be heated to a change of state causing the electromagnet to be shorted thereby actuating the valve which provides the changed flow and pressure conditions required for scramming the absorber element.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {1}
}

Patent:

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