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Title: Thulium-170 heat source

Abstract

An isotopic heat source is formed using stacks of thin individual layers of a refractory isotopic fuel, preferably thulium oxide, alternating with layers of a low atomic weight diluent, preferably graphite. The graphite serves several functions: to act as a moderator during neutron irradiation, to minimize bremsstrahlung radiation, and to facilitate heat transfer. The fuel stacks are inserted into a heat block, which is encased in a sealed, insulated and shielded structural container. Heat pipes are inserted in the heat block and contain a working fluid. The heat pipe working fluid transfers heat from the heat block to a heat exchanger for power conversion. Single phase gas pressure controls the flow of the working fluid for maximum heat exchange and to provide passive cooling.

Inventors:
 [1];  [2];  [3]
  1. (Pleasanton, CA)
  2. (Livermore, CA)
  3. (Tracy, CA)
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
868139
Patent Number(s):
5082617
Assignee:
United States of America as represented by United States (Washington, DC) LLNL
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
thulium-170; heat; source; isotopic; formed; stacks; individual; layers; refractory; fuel; preferably; thulium; oxide; alternating; atomic; weight; diluent; graphite; serves; functions; moderator; neutron; irradiation; minimize; bremsstrahlung; radiation; facilitate; transfer; inserted; block; encased; sealed; insulated; shielded; structural; container; pipes; contain; fluid; pipe; transfers; exchanger; power; conversion; single; phase; gas; pressure; controls; flow; maximum; exchange; provide; passive; cooling; atomic weight; individual layers; transfers heat; neutron irradiation; power conversion; dual layer; passive cooling; heat pipe; heat exchange; heat exchanger; heat transfer; heat source; gas pressure; single phase; heat pipes; maximum heat; isotopic heat; fluid transfer; pressure control; thulium oxide; preferably graphite; /376/

Citation Formats

Walter, Carl E., Van Konynenburg, Richard, and VanSant, James H. Thulium-170 heat source. United States: N. p., 1992. Web.
Walter, Carl E., Van Konynenburg, Richard, & VanSant, James H. Thulium-170 heat source. United States.
Walter, Carl E., Van Konynenburg, Richard, and VanSant, James H. Wed . "Thulium-170 heat source". United States. https://www.osti.gov/servlets/purl/868139.
@article{osti_868139,
title = {Thulium-170 heat source},
author = {Walter, Carl E. and Van Konynenburg, Richard and VanSant, James H.},
abstractNote = {An isotopic heat source is formed using stacks of thin individual layers of a refractory isotopic fuel, preferably thulium oxide, alternating with layers of a low atomic weight diluent, preferably graphite. The graphite serves several functions: to act as a moderator during neutron irradiation, to minimize bremsstrahlung radiation, and to facilitate heat transfer. The fuel stacks are inserted into a heat block, which is encased in a sealed, insulated and shielded structural container. Heat pipes are inserted in the heat block and contain a working fluid. The heat pipe working fluid transfers heat from the heat block to a heat exchanger for power conversion. Single phase gas pressure controls the flow of the working fluid for maximum heat exchange and to provide passive cooling.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {1}
}

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