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Title: Thermal breeder fuel enrichment zoning

A method and apparatus for improving the performance of a thermal breeder reactor having regions of higher than average moderator concentration are disclosed. The fuel modules of the reactor core contain at least two different types of fuel elements, a high enrichment fuel element and a low enrichment fuel element. The two types of fuel elements are arranged in the fuel module with the low enrichment fuel elements located between the high moderator regions and the high enrichment fuel elements. Preferably, shim rods made of a fertile material are provided in selective regions for controlling the reactivity of the reactor by movement of the shim rods into and out of the reactor core. The moderation of neutrons adjacent the high enrichment fuel elements is preferably minimized as by reducing the spacing of the high enrichment fuel elements and/or using a moderator having a reduced moderating effect.
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [4]
  1. (Schenectady, NY)
  2. (Albany, NY)
  3. (Latham, NY)
  4. (Rotterdam, NY)
Publication Date:
OSTI Identifier:
868425
Report Number(s):
US 5136619
DOE Contract Number:
EY-76-C-12-0052
Resource Type:
Patent
Research Org:
Knolls Atomic Power Lab., Schenectady, NY (USA)
Country of Publication:
United States
Language:
English
Subject:
thermal; breeder; fuel; enrichment; zoning; method; apparatus; improving; performance; thermal; breeder; reactor; regions; average; moderator; concentration; disclosed; fuel; modules; reactor; core; contain; types; fuel; elements; enrichment; fuel; element; enrichment; fuel; element; types; fuel; elements; arranged; fuel; module; enrichment; fuel; elements; located; moderator; regions; enrichment; fuel; elements; preferably; shim; rods; fertile; material; provided; selective; regions; controlling; reactivity; reactor; movement; shim; rods; reactor; core; moderation; neutrons; adjacent; enrichment; fuel; elements; preferably; minimized; reducing; spacing; enrichment; fuel; elements; moderator; reduced; moderating; effect; breeder reactor; fuel elements; fuel elements; fuel elements; fuel elements; fuel elements; fuel elements; fuel element; fuel element; fuel element; fuel element; fuel element; fuel element; fuel element; fuel element; reactor core; reactor core; fertile material; shim rod; shim rod; elements located; fuel module; fuel module; fuel modules; thermal breeder; thermal breeder; breeder fuel /376/