Plastic and nonmetallic article shaping or treating: processes – Shaping or treating radioactive material
Patent
1988-10-17
1990-10-16
Lechert, Jr., Stephen J.
Plastic and nonmetallic article shaping or treating: processes
Shaping or treating radioactive material
376411, 376414, 427 6, G21C 2100
Patent
active
049637584
ABSTRACT:
Methods for making nuclear fuel compacts containing precise amounts of nuclear fuel material which exhibit low heavy metal contamination and fewer defective coatings following compact fabrication using a hardenable binder including petroleum pitch or the like. Nuclear fuel particles having a multiple layer fission-product-retentive barrier, with a dense outer layer thereof being surrounded by a protective overcoating, e.g., pyrocarbon having a density between about 1 and 1.2 g/cm.sup.3, that is encapsulated within a thin shell of pyrocarbon from about 1.7 to about 2 g/cm.sup.3 in density, can be precisely metered to create charges containing very precise amounts of nuclear fuel material that can be pre-compacted in molds under relatively high pressures and then combined with the fluid binder which is ultimately carbonized to produce carbonaceous compacts containing very precise nuclear fuel loadings.
REFERENCES:
patent: 3992258 (1976-11-01), Tobin
patent: 4119563 (1978-10-01), Kadner et al.
patent: 4668444 (1987-05-01), Becker
Noren Robert C.
Vanek Richard P.
Bhat Nina
General Atomics
Lechert Jr. Stephen J.
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