Derived Design Requirements

This section is a list of design and implementation requirements for the artificial SSR that emerged from the previous analysis and from the inferences presented so far. These requirements were only implied during the discussion so far but are now made explicit and are described in some detail. 

If each SSR machine is power-driven, then certain significant consequences arise in designing an artificial SSR  

2 Each SSR Machine is Computer-Driven and Software-Driven 

3 Each Piece of SSR Machinery Is Capable of Information Communication 

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It is important for the designer to become familiar with all the information that is available for each plastic, especially that which is pertinent to the product design requirements. Designers, who are knowledgeable of the data derived from metal tests, could have a tendency to apply the plastic data sheet information in a manner similar to that used for metals. This could be understood because there is no warning that some of the data supplied by the manufacturer are applicable only when use and test conditions are nearly the same. 

Adjusted hours are the home office hours that would be required by a large engineering contractor to perform a specific scope of work for a plant with normal sized equipment. They are derived from the base hours, adjusted to take into consideration the specific situation e.g., extent of process design required, type of process and instrumentation, special site conditions, extra retrofit work, existing facilities. Owner s participation, etc. 

These advantages gained in 160 reactor years of KLT-40C operation are derived from an advanced core design requiring uranium fuel with enrichment more than 20% U235 (HEU), and/or plutonium fuel. Some efforts, however, to reduce the enrichment to less than 20% (LEU) are being exercised, which would result an entirely new core. 

Theoretical approaches to molecular structure design require accurate estimates of physical and transport properties. These are derived commonly iiom the principles of thermodynamics and transport phenomena, and using molecular simulations. Since the literature abounds with estimation methods, reference books and handbooks are particularly useful sources. One of the most widely used. Properties of Gases and Liquids (Poling et al., 2001), provides an excellent collection of estimation methods and data for chemical mixtures in the vapor and liquid phases. For polymers. Properties of Polymers (van Krevelen, 1990) provides a collection of group-contribution methods and data for a host of polymer properties. 

The design requirements have been dedded based on our study results of the cycle efficiency calculations, etc., as described earlier and on the study results in U.S.A. l The results of these design requirements are also applicable to the cases slightly deviating from the given conditions. The specifications of the respective components derived from our conceptual design are compared with another data in Table 2. Both data are nearly identical except for the details of estimate and distribution of losses. 

Using past experience (e.g. existing hazards) and inputs from aircraft-level requirements and from the PSSA, we can derive general design requirements for the modification as shown in the following example ... 

Creating a richer model of causation. (Leveson and Dulac 2005) propose the STAMP accident model and the STPA hazard assessment approach. STAMP is based on systems-theoretic concepts of hierarchical control, internal models of the environment and a classification of control errors. STPA takes that classification as the basis for iterative integrated control system safety assessment. At each design iteration the design is assessed and constraints are derived (equivalent to derived safety requirements) and imposed on further design iterations. 

Design requirements and requirements from SSCs are derived by the following... 

For Design Basis fault conditions, as identified in the APIOOO Fault Schedule (see Chapter 5), design requirements are derived based on the SSCs maintaining the safety functions during and following fault conditions (i.e. safety measures). This process is summarised in sub-seetion 4.3.2. 

The fault schedule has been used as the basis for the derivation of the design requirements associated with design basis fault conditions as it identifies the plant failure related initiating events that are within the Design Basis of the plant. 

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