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Title: Post-encapsulation plutonia reduction for Galileo and Ulysses GPHS modules: The module reduction and monitoring facility (MRMF)

Abstract

In heat source systems of the type C/Ir/PuO{sub 2}, ingrowth of CO and CO{sub 2} is evident. This is due to a cyclical reaction between the C and PuO{sub 2} constituents. Gas tap results show that repeated exchanges using a pure inert gas backfill reduces the CO/CO{sub 2} ingrowth rate. Also, the temperatures experienced during Radioisotope Thermoelectric Generator (RTG) processing reduces further the effect such that normal RTG storage temperatures do not result in this deleterious effect. A 36-station vacuum/inert gas manifold has been developed at Mound Facility to serve as a Module Reduction and Monitoring Facility (MRMF) for up to 68 GPHS-type heat source modules. This method of storage effectively prevented atmospheric contamination of modules while reducing the CO/CO{sub 2} ingrowth rate. This paper describes in detail the theoretical, practical, facility, and quality/reliability aspects of this processing facility that has supported the Galileo and Ulysses RTG programs.

Authors:
 [1]
  1. Lamb Associates, Inc. for EG G Mound Applied Technologies, P.O. Box 3000, Miamisburgh, Ohio (USA)
Publication Date:
OSTI Identifier:
5255346
Report Number(s):
CONF-910116-
Journal ID: ISSN 0094-243X; CODEN: APCPC; TRN: 91-027132
Resource Type:
Conference
Journal Name:
AIP Conference Proceedings (American Institute of Physics); (United States)
Additional Journal Information:
Journal Volume: 217:3; Conference: 8. symposium on space nuclear power systems, Albuquerque, NM (United States), 6-10 Jan 1991; Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
07 ISOTOPES AND RADIATION SOURCES; PLUTONIUM OXIDES; CHEMICAL REACTIONS; RADIOISOTOPE HEAT SOURCES; ENCAPSULATION; CARBON; CARBON DIOXIDE; CARBON MONOXIDE; CHEMICAL REACTION YIELD; CONTAINMENT SHELLS; IRIDIUM; RELIABILITY; SPACE VEHICLES; THERMOELECTRIC GENERATORS; ACTINIDE COMPOUNDS; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; CONTAINMENT; DIRECT ENERGY CONVERTERS; ELEMENTS; HEAT SOURCES; METALS; NONMETALS; OXIDES; OXYGEN COMPOUNDS; PLATINUM METALS; PLUTONIUM COMPOUNDS; TRANSITION ELEMENTS; TRANSURANIUM COMPOUNDS; VEHICLES; YIELDS; NESDPS Office of Nuclear Energy Space and Defense Power Systems; 070300* - Isotopic Power Supplies

Citation Formats

Johnson, E W. Post-encapsulation plutonia reduction for Galileo and Ulysses GPHS modules: The module reduction and monitoring facility (MRMF). United States: N. p., 1991. Web. doi:10.1063/1.39988.
Johnson, E W. Post-encapsulation plutonia reduction for Galileo and Ulysses GPHS modules: The module reduction and monitoring facility (MRMF). United States. https://doi.org/10.1063/1.39988
Johnson, E W. 1991. "Post-encapsulation plutonia reduction for Galileo and Ulysses GPHS modules: The module reduction and monitoring facility (MRMF)". United States. https://doi.org/10.1063/1.39988.
@article{osti_5255346,
title = {Post-encapsulation plutonia reduction for Galileo and Ulysses GPHS modules: The module reduction and monitoring facility (MRMF)},
author = {Johnson, E W},
abstractNote = {In heat source systems of the type C/Ir/PuO{sub 2}, ingrowth of CO and CO{sub 2} is evident. This is due to a cyclical reaction between the C and PuO{sub 2} constituents. Gas tap results show that repeated exchanges using a pure inert gas backfill reduces the CO/CO{sub 2} ingrowth rate. Also, the temperatures experienced during Radioisotope Thermoelectric Generator (RTG) processing reduces further the effect such that normal RTG storage temperatures do not result in this deleterious effect. A 36-station vacuum/inert gas manifold has been developed at Mound Facility to serve as a Module Reduction and Monitoring Facility (MRMF) for up to 68 GPHS-type heat source modules. This method of storage effectively prevented atmospheric contamination of modules while reducing the CO/CO{sub 2} ingrowth rate. This paper describes in detail the theoretical, practical, facility, and quality/reliability aspects of this processing facility that has supported the Galileo and Ulysses RTG programs.},
doi = {10.1063/1.39988},
url = {https://www.osti.gov/biblio/5255346}, journal = {AIP Conference Proceedings (American Institute of Physics); (United States)},
issn = {0094-243X},
number = ,
volume = 217:3,
place = {United States},
year = {1991},
month = {1}
}

Conference:
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