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Background
The safe and effective
manufacturing of actinide-bearing fuels for any transmutation
strategy requires that the entire manufacturing process be contained
within a shielded hot cell environment.
To ensure that the fabrication process is feasible, the
entire process must be designed for remote operation.
The equipment must be reliable enough to perform over several
decades, and also easy to maintain or repair remotely.
The facility must also be designed to facilitate its own
decontamination and decommissioning.
In addition to these design factors, the potential viability
of any fuel fabrication process will also be impacted by a number of
variables, such as the current state of technology, potential
problem areas, deployment scaling, facility safety, and cost.
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Research
Objectives and Methods
The
goal of this research project was to provide technical support to
process designers working on the development of the fuel cycles for
transmutation applications. Detailed
process models were developed to better define the impact of fuel
choice on the transmuter fuel cycle, including relative process
losses, waste generation, and plant capital cost.
These process models provide insight regarding required plant
size and number of plants needed to mesh with the fuel recycling
line. They also
determine requirements for automation.
Manufacturing models for large-scale production in a hot
cell environment were also developed.
Combined, these two models allow the assessment of plant
layout, and provide the framework for estimation of plant capital
and operating cost estimates, and for feasibility in general.
The need for development in the areas of robotic and sensor
technology was assessed. The
manufacturing technology developed for hot cell applications was
also applicable to other, more general uses, where occupational
hazards prevent human presence near
processes. The research work was divided into several tasks and
subtasks:
Methods
and Processes – A literature
survey and detailed analysis of the research and development
pertaining to candidate processes for transmuter fuel manufacture
was performed.
Industry standards were used to refine equipment,
instrumentation, and control specifications, and assessed the
reliability and safety of operations.
Simulations
– This task modeled manufacturing processes to generate a
realistic assessment of plant layout, size, feasibility, and
technology development required for large-scale remote fabrication
of fuel. Modeling
of the candidate fuel manufacturing processes was conducted
using the MSC.visualNastran and ProEngineer simulation software
tools. The
modeling of powder-processed fuels was
completed, and the modeling of
other fuel types (metallic, TRISO etc.) was
initiated.
Process
and Equipment for Autonomous Manufacturing
– This task developed an understanding of the cost and capability
of current generation remotely operated equipment suitable for use
in radiation environments.
Monitoring of the market for equipment and components with
regard to suitability for automated manufacturing under hot cell
conditions was
conducted.
Sensors,
Controls, and Operational Safety –
This task determined the adequacy of current technology and the need
for suitable sensor technology development for deployment in hard
radiation environments.
A means to identify the precise location and spatial
orientation of all parts in the robot’s work envelope were
implemented. The
ability to position and handle materials along with trouble shooting
techniques were evaluated.
Radiation hardened vision systems appear to be promising
technologies.
The Wäelischmiller robot inserts the fuel pins in the cladding tube.

Friction
Force (N) between Second Pin and Cladding Tube vs. Time (sec) during
Insertion.
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