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Fabricating niobium test loops for the SP-100 space reactorThis article describes the successful fabrication, operation, and evaluation of a series of niobium-alloy (Nb-1 Zr and PWC-11) thermal convection loops designed to contain and circulate molten lithium at 1,350 K. These loops were used to establish the fabrication variables of significance for a nuclear power supply for space. Approximately 200 weldments were evaluated for their tendency to be attacked by lithium as a function of varying atmospheric contamination. No attack occurred for any weldment free of contamination, with or without heat treatment, and no welds accidentally deviated from purity. The threshold oxygen content for weldment attack was determined to be 170-200 ppm. Attack varied directly with weldment oxygen and nitrogen contents.
Document ID
19930060208
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bryhan, Anthony J.
(NASA Headquarters Washington, DC United States)
Chan, Ricky C.
(Martin Marietta Corp. San Jose, CA, United States)
Date Acquired
August 16, 2013
Publication Date
June 1, 1993
Publication Information
Publication: JOM
Volume: 45
Issue: 6
ISSN: 1047-4838
Subject Category
Metallic Materials
Accession Number
93A44205
Funding Number(s)
CONTRACT_GRANT: DE-AC03-86SF-16006
Distribution Limits
Public
Copyright
Other

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