Preliminary Design Review

Preliminary Design Review - to establish that all risks have been resolved and development specifications produced for each sub-element of the product/service before detail design commences... 

A preliminary design review between Nuvera, Williams and Caterpillar took place May 20-21, 2002. Power module design specifications have been completed. 

Examine preliminary design Evaluate preliminary design Review economics and suitability of materials and process based on preliminary proportions Consider overall compatibility and practicality of all materials and parts in component as a system... 

Note The review of all the AND gates is best performed by someone other than the originator of the qualitative or quantitative analysis (e.g. an independent Compliance Verification Engineering or an Independent Safety Assessor). It is thus unlikely that this step can be completed before the Preliminary Design Review (PDR) and is likely to be iterative as the system architecture becomes more mature. 

Definition Preliminary design review Establish general design for specific development... 

It should be completed concurrently with design process. Various check points pertinent to DEMEA/DFMECA are depicted in Fig. IV/2.0.4-1B. All such checks are carried out during the preliminary design review meeting, critical design review meeting, etc. 

Revise preliminary design of component Evaluate preliminary design Review economics and suitability of materials and process based on preliminary proportions. Consider overall compatibility and practicality of all materials and parts in component as a system Does it meet functional and performance requirements Is it compatible with other components that may interact with it, relative to effects of expansion and contraction, structural support or movement, fire safety, etc. ... 

Supporting Assessment and Review As part of the different milestones of the systems engineering process [11], engineering artifacts (as well as the safety case) are to be reviewed and accepted before development proceeds. Simple queries on the safety argument can be used to determine whether the relevant obligations have been met. For example, during a Preliminary Design Review (PDR), we can query the safety case to establish whether or not all the identified safety requirements have been allocated. 

See Preliminary Design Review (PDR), System Requirements Review (SRR), and Systems Engineering Technical Reviews (SETR) for additional related information. 

A preliminary system safety assessment (PSSA) is essential in order to determine (and agree) the depth of assessment needed, the criteria utilised and the manner in which the safety objectives are to be accomplished. The PSSA concentrates on the functions and vulnerabiUties of the system instead of the detailed analysis, and can thus be conducted prior to the definition of the system s architecture. The PSSA remains a live document until the final SSA can be issued. By the preliminary design review (PDR), the PSSA should include functional failure consequences to the aircraft and its occupants consequences of other possible malfunctions of a system (e.g. overheating) and their effects on surrounding systems consequences to the system of failure in other systems or parts of the aircraft, identification of any possible common-mode failures or cascade failures which my need detailed investigation the identification of possible vulnerabilities to flight crew or maintenance error. 

The engineering model was to be the first full-scale demonstration of the integrated power plant system, and was to make maximum use of prototypic materials and components. The reactor module was to be based on the NRPCT conceptual design, while the spacecraft module components were to be based on the NGST preliminary design review. 

As we shall see in Chapter 5, the PHA is used in support of the Preliminary Design Review (PDR) milestone to develop the requirements for new procurements while developing the statement of work or procurement specification for new hardware for the program. Completion of the PHA is required in support of the PDR to verify that the technical safety requirements have been incorporated into the preliminary design of the item for procurement. Hazards identified in the PHA will be updated in the System Hazard Analysis (SHA) and the Subsystem Hazard Analysis (SSHA) as the life cycle progresses. 

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