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:
- Issue Date:
- Research Org.:
- General Electric Co., Schenectady, NY (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 865811
- Patent Number(s):
- 4582675
- Application Number:
- 06/429,922
- Assignee:
- United States of America as represented by U.S. Department of Energy (Washington, DC)
- Patent Classifications (CPCs):
-
G - PHYSICS G21 - NUCLEAR PHYSICS G21C - NUCLEAR REACTORS
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01H - ELECTRIC SWITCHES
- DOE Contract Number:
- AT03-76SF71032
- Resource Type:
- Patent
- Resource Relation:
- Patent File Date: 1982 Sep 30
- 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}
}
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