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Title: Nuclear reactor shutdown system

An inherent shutdown system for a nuclear reactor having neutron absorbing rods affixed to an armature which is held in an upper position by a magnetic flux flowing through a Curie temperature material. The Curie temperature material is fixedly positioned about the exterior of an inner duct in an annular region through which reactor coolant flows. Elongated fuel rods extending from within the core upwardly toward the Curie temperature material are preferably disposed within the annular region. Upon abnormal conditions which result in high neutron flux and coolant temperature, the Curie material loses its magnetic permeability, breaking the magnetic flux path and allowing the armature and absorber rods to drop into the core, thus shutting down the fissioning reaction. The armature and absorber rods are retrieved by lowering the housing for the electromagnet forming coils which create a magnetic flux path which includes the inner duct wall. The coil housing then is raised, resetting the armature.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. (Niskayuna, NY)
  2. (Monroeville, PA)
  3. (Murrysville, PA)
  4. (Penn Hills, PA)
Publication Date:
OSTI Identifier:
864066
Report Number(s):
US 4304632
DOE Contract Number:
AC04-76
Resource Type:
Patent
Research Org:
Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA
Country of Publication:
United States
Language:
English
Subject:
nuclear; reactor; shutdown; inherent; shutdown; nuclear; reactor; neutron; absorbing; rods; affixed; armature; held; upper; position; magnetic; flux; flowing; curie; temperature; material; curie; temperature; material; fixedly; positioned; exterior; inner; duct; annular; region; reactor; coolant; flows; elongated; fuel; rods; extending; core; upwardly; curie; temperature; material; preferably; disposed; annular; region; abnormal; conditions; result; neutron; flux; coolant; temperature; curie; material; loses; magnetic; permeability; breaking; magnetic; flux; path; allowing; armature; absorber; rods; drop; core; shutting; fissioning; reaction; armature; absorber; rods; retrieved; lowering; housing; electromagnet; forming; coils; create; magnetic; flux; path; inner; duct; wall; coil; housing; raised; resetting; armature; rods extending; temperature material; temperature material; temperature material; coolant temperature; magnetic permeability; coolant flows; absorber rods; absorber rods; curie temperature; curie temperature; curie temperature; fuel rods; reactor coolant; magnetic flux; magnetic flux; magnetic flux; nuclear reactor; nuclear reactor; neutron flux; coolant flow; fuel rod; reactor shutdown; annular region; annular region; neutron absorbing; preferably disposed; abnormal condition; normal conditions; flux path; flux path; elongated fuel; inner duct; inner duct; inherent shutdown; normal condition; flux flow; fixedly positioned /376/976/