The Application of Visualization and Simulation in a Dismantling Process

Abstract

ÃÃThe lack of as-built drawings and information for many old nuclear facilities impedes the planning for a decommissioning. Traditional manual walkthroughs subject workers to lengthy exposure to radiological and other hazards. And also there have been a delay in the dismantling schedules and that in an increase in the amount of waste, which have caused a heavy expenditure for the decommissioning cost. In order for a 3D model to represent the real dismantling operation environment, realistic dismantling activities and scenarios were modeled. We present a dismantling digital mock-up system that can show a dismantling process through an animation and enable us to evaluate the major parameters that can directly affect the cost in a static simulation as a preview to the dismantling activities on a hypothetical dismantling environment. We carried out a prototype 3D animation and a simulation system for dismantling the thermal column in Korean Research Reactor-1(KRR-1). The results show that the modeling of a realistic scenario makes it possible to demonstrate the adequacy of the design and can provide operators with a high fidelity under the real working conditions.

Influence of porosity and aspect ratio of nanoparticles on the interface modification of glass/epoxy composites

“…Mechanical interlocking of composites is directly related to fiber and resin properties in the interface which are always affected by fiber surface properties. Therefore, tensile strength of samples containing nanostructured particles was increased compared to GP samples as a result of mechanical interlocking caused by surface roughness .…”

“…Their mechanical properties have been affected by improvement of adhesion between fiber and matrix . Structural and physical properties of interface are the major parameters for transferring load between fiber and resin in composites which determine their mechanical properties .…”

Methodology for Establishing Segmentation Strategy for Large Metal Components from Nuclear Power Plants with Consideration of Packaging into Containers

“…e constraint w H,S < d D should be applied for the vertical segmentation of a hemispherical part (see Figure 5 and equation ( 9)), while t C < d D is applied for the vertical segmentation of the cylindrical part. e depth of the segmented piece w H,S should be larger than the thickness of the object t H (� t C ), if r H (� r C ) > 0 as implied in (10). e upper limit of t H (i.e., 0.538 m) can be obtained by varying t H in ( 7), (8), and (10) and then finding the limiting value to which t H converges when w H,S approaches its upper limit (i.e., d D ).…”

“…Various experiences in segmentation of large metal components at nuclear power plants (NPPs) under decommissioning can be found in literature. For instance, the segmentation strategy using 3D modeling software (e.g., CAD-CAM), the segmentation techniques adopted for large components, and the results have been reported in various literature works including decommissioning experience reports for actual NPPs and a few technical papers [4,[6][7][8][9][10]. However, these past studies have presented neither generalized nor detailed methodologies to establish the segmentation strategy.…”