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Title: Magnetic switch for reactor control rod. [LMFBR]

Abstract

A magnetic reed switch assembly is described 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 electro-magnetic grapple which allows the control rod to drop into the reactor core for controlling the reactivity of the core.

Inventors:
Issue Date:
OSTI Identifier:
5714499
Application Number:
ON: DE83018032
Assignee:
ERA-08-053950; EDB-83-176364
DOE Contract Number:  
AT03-76SF71032
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; LMFBR TYPE REACTORS; SCRAM RODS; SWITCHES; ENGINEERED SAFETY SYSTEMS; REACTOR CONTROL SYSTEMS; BREEDER REACTORS; CONTROL ELEMENTS; CONTROL SYSTEMS; ELECTRICAL EQUIPMENT; EPITHERMAL REACTORS; EQUIPMENT; FAST REACTORS; FBR TYPE REACTORS; LIQUID METAL COOLED REACTORS; REACTOR COMPONENTS; REACTORS; 220400* - Nuclear Reactor Technology- Control Systems; 210500 - Power Reactors, Breeding

Citation Formats

Germer, J.H. Magnetic switch for reactor control rod. [LMFBR]. United States: N. p., 1982. Web.
Germer, J.H. Magnetic switch for reactor control rod. [LMFBR]. United States.
Germer, J.H. Thu . "Magnetic switch for reactor control rod. [LMFBR]". United States.
@article{osti_5714499,
title = {Magnetic switch for reactor control rod. [LMFBR]},
author = {Germer, J.H.},
abstractNote = {A magnetic reed switch assembly is described 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 electro-magnetic 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 = {1982},
month = {9}
}