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Title: Magnetic switch for reactor control rod

Abstract

A magnetic reed switch assembly for activating an electromagnetic grapple utilized to hold a control rod in position above a reactor core. In normal operation the magnetic field of a permanent magnet is short-circuited by a magnetic shunt, diverting the magnetic field away from the reed switch. The magnetic shunt is made of a material having a Curie-point at the desired release temperature. Above that temperature the material loses its ferromagnetic properties, and the magnetic path is diverted to the reed switch which closes and short-circuits the control circuit for the control rod electromagnetic grapple which allows the control rod to drop into the reactor core for controlling the reactivity of the core.

Inventors:
 [1]
  1. San Jose, CA
Issue Date:
Research Org.:
General Electric Co., Boston, MA (United States)
OSTI Identifier:
865811
Patent Number(s):
4582675
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Classifications (CPCs):
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02E - REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
G - PHYSICS G21 - NUCLEAR PHYSICS G21C - NUCLEAR REACTORS
DOE Contract Number:  
AT03-76SF71032
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
magnetic; switch; reactor; control; rod; reed; assembly; activating; electromagnetic; grapple; utilized; hold; position; core; normal; operation; field; permanent; magnet; short-circuited; shunt; diverting; material; curie-point; desired; release; temperature; loses; ferromagnetic; properties; path; diverted; closes; short-circuits; circuit; allows; drop; controlling; reactivity; switch assembly; reactor control; magnetic switch; control circuit; normal operation; control rod; permanent magnet; magnetic field; reactor core; magnetic properties; reed switch; magnetic reed; magnetic path; /376/335/976/

Citation Formats

Germer, John H. Magnetic switch for reactor control rod. United States: N. p., 1986. Web.
Germer, John H. Magnetic switch for reactor control rod. United States.
Germer, John H. Wed . "Magnetic switch for reactor control rod". United States. https://www.osti.gov/servlets/purl/865811.
@article{osti_865811,
title = {Magnetic switch for reactor control rod},
author = {Germer, John H},
abstractNote = {A magnetic reed switch assembly for activating an electromagnetic grapple utilized to hold a control rod in position above a reactor core. In normal operation the magnetic field of a permanent magnet is short-circuited by a magnetic shunt, diverting the magnetic field away from the reed switch. The magnetic shunt is made of a material having a Curie-point at the desired release temperature. Above that temperature the material loses its ferromagnetic properties, and the magnetic path is diverted to the reed switch which closes and short-circuits the control circuit for the control rod electromagnetic grapple which allows the control rod to drop into the reactor core for controlling the reactivity of the core.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1986},
month = {1}
}

Patent:

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