Core Design Scope

The core design scope of the Super LWR can be roughly defined by the considerations of the design margins, criteria, boundary conditions, and targets. How these four items affect the Super LWR core design is explained in this section. 

Three other modifications of the standard conditions provide synthetically useful strategies for the preparation of dihydrofurans. One method, called the interrupted Feist-Benary reaction, utilizes milder reaction conditions to stop the final dehydration step. For example, Calter combined bromide 47 with dicarbonyl 48 to produce dihydrofuran 49 as a mixture of diastereomers. He examined the scope and diastereoselectivity of this process and applied this reaction toward the synthesis of the polycyclic core of the zaragozic acids. A method principally designed to yield practical syntheses of cyclic ketodiesters also furnished a dihydrofuran via a variation of the interrupted Feist-Benary reaction. ... 

Mineralization in apoferritin involves a prior oxidation of Fe(II) as it enters channels in the protein shell. The ferroxidase center seems to be composed of Glu (Gin) and His residues situated between four helices (P. M. Harrison, personal communication). There is scope for exploring the design of agents that could block the entry of iron into the core of the protein or hasten its passage out. It is possible that non-redox-active metal ions such as Ga(III), In(III), and Al(III) can act in this way. The nature of the Fe(II) complex in the cytoplasm, which acts as a donor to ferritin, is not clear yet, but perhaps it could be Fe(II) glutathione. 

Within the scope of this work, the initial spray breakup process, providing information about the dense spray core, will be investigated. The formation of fuel drops will be simulated based on first-principles and will offer detailed insight into primary atomization. The three-dimensional, transient calculation will track the interface evolution through droplet formation and breakup. Because the results will be based on conservation laws, they will be extremely general. This will lead to better models that can be used with confidence in the engine design process. 

Apart from the dimensions of the corer and cutter, it is essential to have well-designed nonreturn valves and sample retainers to minimize the resistance to penetration and prevent the loss of any sediment on recovery. In addition to the disturbance created inside the core barrel, the soil ahead of the advancing corer is subjected to stresses that influence the final core (Kallstenius, 1958). In marine sediments, there is very little scope for compaction of sediments inside the core tube because only a negligible amount of water can be forced out of the material during the short period of time required for penetration (Piggot, 1941 ... 

These targets are associated with the scope, data, methods, assumptions and criteria for core damage which are defined in Chapter 2.17. In particular they include the risks in shutdown modes which have been shown to be a significant contributor in assessments of present reactor designs. 

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