Implementation of the Design

With a view to test the practical implementation of the design, a set of scenarios was devised (Table 1). We started with case B1 where the cold feed, Fi, was suppressed. All the feed flow is now supplied through F2, which explains the high value for the energy demand Q. In B2 the feed condition was changed to saturated vapor (q2 = 0) which substantially reduces the energy supplied and, consequently, the product purity. 

This important and difficult reaction was used to test the design procedure. We followed the design steps listed in Table 4 except that initially we did not use ethylene glycol but rather water as the hydrophilic liquid for the immobilized film, i.e., an SAP-type catalyst. Implementation of the design sequence began by developing... 

Once the API manufacturer has generated enough initial information for the new process, they will have several options for implementation of the design and construction of the new facility. There are various execution strategies, which include ... 

The acceptance criterion for the resolution of GSI 099 in the design of future plants is implementation of the design-related improvements recommended in GL 88-17, as summarized below. 

The Structural Domain describes the hierarchical logical implementation of the design in an abstract, technology independent fashion. For example, at the Register-Transfer Level the Structural Domain describes the design in terms of an abstract set of functional units, multiplexors, and registers needed to implement the register transfers required by the Behavioral Domain, plus a controller and control ROM. 

Other transformations have a more extensive effect, dramatically changing the implementation of the design ... 

In addition to the weaknesses in the RBMK design described above, the detailed implementation of the design also allowed greater freedom of action for the operators than would be normal in a reactor design elsewhere. For example, the operators could override reactor trip systems at the flick of a switch in Western designs, key interlock systems would have prevented this. Also it was essential for the safe operation of the plant that the control rods should never be withdrawn beyond the point at which the control rod reactivity margin became dangerously low, yet this vital aspect was left entirely to the operators, with no automatic trip system. 

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