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Design Considerations in High-Temperature Devices
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Design Considerations - index
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Process Development cont'd


DOE-HDBK-1132-99
The treatment portion of the off-gas system typically consists of air scrubbers
and HEPA filtration for particulate removal plus nitrous oxide reduction
through addition of ammonia in the presence of a catalyst.
Material Considerations. The chemical make-up of the off-gas stream requires
2.14.13
special attention. Typically, resistance to the corrosive characteristics of the off-
gas will dictate the types of materials used in the system. Material selections
typically include the 300 series of stainless steels, Inconel,TM and Hastalloy.TM
2.14.14
Process Development . Vitrification development is the process by which a
recipe and protocol are developed for the manufacture of an acceptable high-
level waste product. In particular, this activity focuses on developing and
refining the process for manufacturing the vitrified high-level waste into a
glass matrix exclusive of the canister. The development process focuses
primarily on two areas:
identification and development of the final waste glass product
composition and
development of the process for achieving the final waste glass product
given the available technology.
Development of the final waste glass product composition, frequently referred
to as the "arget composition,"is driven by a number of factors, including
t
regulatory performance specifications, behavior of the target composition in
the melter, and compatibility with the melter technology.
Regulatory requirements are issued through various DOE Offices including
the Office of Civilian Radioactive Waste Management (DOE-RW) and Office
of Environmental Management (DOE-EM). Those offices, respectively,
promulgate their requirements in the Waste Acceptance System
Requirements Document and Waste Acceptance Product Specifications for
Vitrified High-Level Waste Forms. Each of these documents contains the
technical specifications that the wastes produced must meet for acceptance of
their vitrified high-level waste into the repository. As such, among other
characteristics, target compositions exhibit the characteristics necessary for
meeting these technical specifications. With respect to the glass waste form,
I-151


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