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Title: Thermionic switched self-actuating reactor shutdown system

Abstract

A self-actuating reactor shutdown system incorporating a thermionic switched electromagnetic latch arrangement which is responsive to reactor neutron flux changes and to reactor coolant temperature changes. The system is self-actuating in that the sensing thermionic device acts directly to release (scram) the control rod (absorber) without reference or signal from the main reactor plant protective and control systems. To be responsive to both temperature and neutron flux effects, two detectors are used, one responsive to reactor coolant temperatures, and the other responsive to reactor neutron flux increase. The detectors are incorporated into a thermionic diode connected electrically with an electromagnetic mechanism which under normal reactor operating conditions holds the the control rod in its ready position (exterior of the reactor core). Upon reaching either a specified temperature or neutron flux, the thermionic diode functions to short-circuit the electromagnetic mechanism causing same to lose its holding power and release the control rod, which drops into the reactor core region under gravitational force.

Inventors:
 [1];  [1];  [2]
  1. (San Jose, CA)
  2. (Livermore, CA)
Issue Date:
Research Org.:
GENERAL ELECTRIC CO
OSTI Identifier:
867176
Patent Number(s):
4880596
Assignee:
United States of America as represented by United States (Washington, DC) OSTI
DOE Contract Number:  
AT03-76SF71032
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
thermionic; switched; self-actuating; reactor; shutdown; incorporating; electromagnetic; latch; arrangement; responsive; neutron; flux; changes; coolant; temperature; sensing; device; directly; release; scram; control; rod; absorber; reference; signal; main; plant; protective; systems; effects; detectors; temperatures; increase; incorporated; diode; connected; electrically; mechanism; normal; operating; conditions; holds; position; exterior; core; reaching; specified; functions; short-circuit; causing; lose; holding; power; drops; region; gravitational; force; reactor operating; coolant temperature; control systems; temperature change; temperature changes; reactor coolant; operating conditions; control rod; reactor core; neutron flux; reactor shutdown; specified temperature; operating condition; core region; reactor plant; normal reactor; connected electrically; self-actuating reactor; thermionic device; diode connected; thermionic switched; thermionic switch; gravitational force; magnetic latch; /376/313/337/361/374/976/

Citation Formats

Barrus, Donald M., Shires, Charles D., and Brummond, William A. Thermionic switched self-actuating reactor shutdown system. United States: N. p., 1989. Web.
Barrus, Donald M., Shires, Charles D., & Brummond, William A. Thermionic switched self-actuating reactor shutdown system. United States.
Barrus, Donald M., Shires, Charles D., and Brummond, William A. Sun . "Thermionic switched self-actuating reactor shutdown system". United States. https://www.osti.gov/servlets/purl/867176.
@article{osti_867176,
title = {Thermionic switched self-actuating reactor shutdown system},
author = {Barrus, Donald M. and Shires, Charles D. and Brummond, William A.},
abstractNote = {A self-actuating reactor shutdown system incorporating a thermionic switched electromagnetic latch arrangement which is responsive to reactor neutron flux changes and to reactor coolant temperature changes. The system is self-actuating in that the sensing thermionic device acts directly to release (scram) the control rod (absorber) without reference or signal from the main reactor plant protective and control systems. To be responsive to both temperature and neutron flux effects, two detectors are used, one responsive to reactor coolant temperatures, and the other responsive to reactor neutron flux increase. The detectors are incorporated into a thermionic diode connected electrically with an electromagnetic mechanism which under normal reactor operating conditions holds the the control rod in its ready position (exterior of the reactor core). Upon reaching either a specified temperature or neutron flux, the thermionic diode functions to short-circuit the electromagnetic mechanism causing same to lose its holding power and release the control rod, which drops into the reactor core region under gravitational force.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1989},
month = {1}
}

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