THE DETAILED DESIGN STAGE

A typical project has several phases (illustrated below). This chapter on securing support concentrates on the conceptual design and transition to the detailed design stage. You should remember that the team will need to seeure support from different people at other stages of the project as well. 

In the detailed design stage, everything must be specified. Each phase of the preliminary design must now be done in much more detail. The flow sheets develop into piping and instrument diagrams. The duty requirements for a piece of equipment become a specification sheet. The layout drawings may be replaced by a scale model, and a construction bid or detailed cost estimate is obtained to verify the previous cost estimate. 

Also indices such as the Dow Fire and Explosion Hazard Index and the Mond Index have been suggested to measure the degree of inherent SHE of a process. Rushton et al. (1994) pointed out that these indices can be used for the assessment of existing plants or at the detailed design stages. They require detailed plant specifications such as the plot plan, equipment sizes, material inventories and flows. Checklists, interaction matrices, Hazop and other hazard identification tools are also usable for the evaluation, because all hazards must be identified and their potential consequences must be understood. E.g. Hazop can be used in different stages of process design but in restricted mode. A complete Hazop-study requires final process plans with flow sheets and PIDs. 

Many companies engage specialist Engineering, Procurement, and Construction (EPC) companies, commonly known as contractors, at the detailed design stage. 

The results of the preliminary study will enable potential problem areas to be seen ahead of the detail design stage. The results will have been obtained at a minimum cost. 

The preliminary operations of secondary loop isolation from the primary part and residual sodium draining and collection in storage tanks for treatment in the sodium treatment installation. These operations are currently either at the detailed design stage, or pending execution on site work programmed from 2002 to 2004. 

The enterprise shall prepare and control the specifications needed to guide componmt design activities of the detailed design stage of subsystem definition. 

The enterprise should update and control all changes to approved specifications during the detailed design stage. Typically for this stage in the life cycle the approved specifications may include the system, subsystem, and component interface specifications the system specification and product, subsystem, and assembly specifications. 

Component reviews should be completed by the enterprise for each component at the completion of the detailed design stage. The purpose of this review is to ensure that... 

DESIGN DESCRIPTIONS FOR REACTORS IN THE DETAILED DESIGN STAGE... 

A list of basic R D and tests to be performed at the detailed design stage has been prepared, ANNEX XIX. In addition, in order to provide a more flexible supply of energy, IPPE and Gidropress also develop a smaller version of lead-bismuth cooled reactor — the SVBR-10 of lOMW(e). 

Once the agreement with the user is reached and the technical assignment (terms of reference) is approved, it is estimated to take 5 years to finalize design development, license, construct and commission the UNITHERM NPP, provided there are no financial or organizational constraints. The detailed design stage would include qualification of the core, heat exchangers, CEDMs, etc. At present, the time schedule for these activities is not available. 

One notable exception is the Russian lead-bismuth cooled reactor SVBR-75/100, which has reached the detailed design stage and is expected to be ready for licensing soon. The reason behind this is that the SVBR-75/100 is thoroughly based on 80 reactor-years of the operation experience of its submarine prototypes. 

Of the thirteen concepts and designs of water cooled SMRs, five (SMART, CAREM-25, VBER-300, VK-300, and AHWR) are at the detailed design stage four (IRIS, MARS, CCR and RUTA-70) are at the basic (preliminary) design stage others are at the conceptual or early conceptual (KAMADO) design stages. 

For the CAREM, the progress from a basic to the detailed design stage and licensing pre-application is observed, with the projected deployment date moved from 1995 to 2006 and beyond. 

Over the past four years, the PBMR has moved from a conceptual to the detailed design stage. The timeline of readiness for demonstration plant deployment was rescheduled from 2005 to 2010. 

Advanced control and monitoring systems with the enhanced reliability, intelligence and limiting features (Level 2 in Table 4) are mentioned for all designs that have reached the basic or the detailed design stage, see Table 2. 

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