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Title: Yttrium and rare earth stabilized fast reactor metal fuel

Abstract

This patent describes an improved metal alloy reactor fuel consisting essentially of uranium, plutonium, and at least one element from the group consisting of yttrium, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium.

Inventors:
; ;
Publication Date:
OSTI Identifier:
6827463
Patent Number(s):
US 5112534; A
Application Number:
PPN: US 7-489296
Assignee:
Dept. of Energy, Washington, DC (United States) NOV; NOV-93-004009; EDB-93-022438
Resource Type:
Patent
Resource Relation:
Patent File Date: 5 Mar 1990
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; 36 MATERIALS SCIENCE; 22 GENERAL STUDIES OF NUCLEAR REACTORS; FAST REACTORS; NUCLEAR FUELS; CHEMICAL COMPOSITION; CERIUM; GADOLINIUM; HOLMIUM; LANTHANUM; NEODYMIUM; PLUTONIUM; PRASEODYMIUM; PROMETHIUM; RARE EARTH COMPOUNDS; URANIUM; YTTRIUM ADDITIONS; ACTINIDES; ALLOYS; ELEMENTS; ENERGY SOURCES; EPITHERMAL REACTORS; FUELS; MATERIALS; METALS; RARE EARTHS; REACTOR MATERIALS; REACTORS; TRANSURANIUM ELEMENTS; YTTRIUM ALLOYS 050700* -- Nuclear Fuels-- Fuels Production & Properties; 360202 -- Ceramics, Cermets, & Refractories-- Structure & Phase Studies; 220300 -- Nuclear Reactor Technology-- Fuel Elements

Citation Formats

Guon, J., Grantham, L.F., and Specht, E.R. Yttrium and rare earth stabilized fast reactor metal fuel. United States: N. p., 1992. Web.
Guon, J., Grantham, L.F., & Specht, E.R. Yttrium and rare earth stabilized fast reactor metal fuel. United States.
Guon, J., Grantham, L.F., and Specht, E.R. 1992. "Yttrium and rare earth stabilized fast reactor metal fuel". United States. doi:.
@article{osti_6827463,
title = {Yttrium and rare earth stabilized fast reactor metal fuel},
author = {Guon, J. and Grantham, L.F. and Specht, E.R.},
abstractNote = {This patent describes an improved metal alloy reactor fuel consisting essentially of uranium, plutonium, and at least one element from the group consisting of yttrium, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1992,
month = 5
}
  • To increase the operating temperature of a reactor, the melting point and mechanical properties of the fuel must be increased. For an actinide-rich fuel, yttrium, lanthanum and/or rare earth elements can be added, as stabilizers, to uranium and plutonium and/or a mixture of other actinides to raise the melting point of the fuel and improve its mechanical properties. Since only about 1% of the actinide fuel may be yttrium, lanthanum, or a rare earth element, the neutron penalty is low, the reactor core size can be reduced, the fuel can be burned efficiently, reprocessing requirements are reduced, and the nuclearmore » waste disposal volumes reduced. A further advantage occurs when yttrium, lanthanum, and/or other rare earth elements are exposed to radiation in a reactor, they produce only short half life radioisotopes, which reduce nuclear waste disposal problems through much shorter assured-isolation requirements.« less
  • This patent describes a process for the production of polysilanes comprising contacting a silane of the formula R{sup 1}R{sup 8}SiH{sub 2} with a compound of the formula C{sub p2}MR{sup 2}. In the formula R{sup 1} is hydrogen, saturated hydrocarbyl or aromatic hydrocarbyl; R{sup 8} is hydrogen, saturated hydrocarbyl or aromatic hydrocarbyl; C{sub p} is {eta}{sup 5}-cyclopentadienyl or {eta}{sup 5}-cyclopentadienyl substituted with hydrocarbyl, substituted hydrocarbyl or silyl; M is scandium, yttrium or a rare earth metal; and R{sub 2} is saturated or aromatic hydrocarbyl, substituted saturated hydrocarbyl, substituted aromatic hydrocarbyl, hydrogen or silyl. Also described is a process for the hydrosilationmore » of alphaolefins.« less
  • Thermistors comprising transition metal such as iron, rare earth of the lanthanide series or yttrium, and oxygen exhibit sufficient independence to variation in oxygen partial pressure over a range of exhaust gas conditions of internal combustion engines as to make them particularly suitable for temperature compensation of oxygen sensors such as those derived from titania as well as temperature sensing in other oxygen varying environments.
  • Addition of an oxygenated compound and a diesel fuel soluble form of a rare earth metal has been found to reduce particulate emissions from a diesel fueled engine. Preferred soluble rare earth metal additives include cerium carbonyls such as cerium salts of alkylcarboxylic acids and cyclic carboxylic acids.
  • Available from the Commission of European Communities, Luxembourg. As applied to a UO/sub 2/ fuel, a nuclear fuel particle according to the invention may comprise a central seed of lanthanum oxide enveloped in UO/sub 2/-powder so as to form a substantially spherical kernel. The kernel may then be coated by one or more layers of fission-product-retaining material comprising layers of pyrocarbon and preferably one layer of silicon carbide. The lanthanum oxide acts as an oxygen getter when oxygen is liberated from fissioned uranium. (EU)