Preliminary design stage

Each preliminary subsystem specification and preliminary design-to baseline should be evolved into a subsystem specification and a design-to baseline, respectively. Preliminary component specifications and build-to baselines should be defined for the components of the subsystem being developed. Final subsystem documents should include identification of recotmnended components and interfaces resolution of sub- 

The enterprise shall apply the SEP, described in Clause 6, to each subsystem for the purpose of generating subsystem fimctional and physical architectures. Specific activities to be accomplished are fisted in Table 3. 

The enterprise shall identify the assemblies of each subsystem and define the design and functional interface requirements among the assemblies and their corresponding performance requirements and design constraints. Subsystem performance requirements are allocated among the assemblies so as to assure requirements traceability from subsystems to appropriate assemblies, and from assemblies to the parent subsystem. 

The enterprise shall mitigate subsystem-level risks that were assessed to be critical to subsystem development during system definition, and shall assess and mitigate assembly risks associated with each subsystem. For critical subsystem/assembly risks, simulations, scale model tests, or prototype tests should be used to demonstrate mitigation to an acceptable risk level with respect to cost, schedule, and/or performance. The enterprise should assess component risks and prioritize critical risks based on the probability of occmrence and related consequences to cost, schedule, and/or performance. 

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The toxicity of both feeds and products must be carefully considered during the preliminary design stages (53,54) especially if the feeds or products contain known or suspected carcinogens. Special testing may even be requked prior to operation to determine the toxicity of unknown materials. 

An analysis of this type is appropriate during the preliminary design stage when process alternatives may have to be screened economically, or when it is necessary to determine a feasible design as the basis for equipment trials and/or final designs. 

The HAZOP is a very useful teclmique, which may lead to a more reliable and safer process. Whether it is applied to preliminary design stages or to tlie detailed layout of an existing plant, it can lead to a better understanding of the process and possible malfunctions. It reduces the possibility of accidents for tlie process, improves on-stream availability of the process, and provides training for the evaluation of any process. Finally, HAZOP is also a way of optimizing a process and providing a reliable and cost-effective system. 

It provides sufficient details to permit scope and cost tracking during the preliminary design stage. 

Apply high-fidelity models for equipment design Apply consistent design by leveraging the same validated thermophysical properties knowledge and models used in preliminary design stages... 

During the preliminary design stage, the enterprise should update and control all changes to established specifications. Typically for this stage in the life cycle, specifications under control include the system interface specification, subsystem interface specifications, product specifications, and the system specification. 

During the preliminary design stage, the enterprise should update and control all changes to the system baseline. 

Subsystem reviews should be completed by the enterprise for each subsystem at the completion of its preliminary design stage. The pnrpose of each review is to assure that... 

The applicant should contact the competent authority during the preliminary design stage to discuss the implementation of the relevant design principles and to estabhsh both the approval procedure and the actions which should be carried out. 

In the preliminary design stages, seismic effects (in terms of forces and undesired torsional or rocking effects) should be minimized by the appropriate selection of a structural layout applying certain general criteria, such as ... 

Basic (in some member states — preliminary) design stage ... 

At the time of this report, the preliminary design stage for optimization of the FUJI core characteristics such as fissile inventory, fuel conversion ratio (CR), average power density, core lifetime and control was underway. An example of the preliminary results of the design development (for the FUJI-233Um concept) is shown in Table XXX-1. 

For the preliminary design stage, some designers treat the upper slope on top of the flat backfill surface as another equivalent uniformly distributed surcharge. This may not satisfy soil mechanical theories but is an acceptable approach for a preliminary design stage estimate. 

If Ip is unknown at the preliminary design stage, then the soil may be regarded as a problem soil if the clay size fraction is less than 50% of the silt size fraction. 

Table 9.6 gives some typical values for travel distances that can be applied at a preliminary design stage, or where there is no controlling legislation or guidance. 

Design and regulatory status 2005 - Basic design completed - Pre-hcensing safety appraisal started - Preliminary design stage - Licensing not yet started... 

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. 

The GT-MHR for plutonium consumption is at the preliminary design stage. A schedule produced indicates that its prototype could begin full power operation nine years after completion of the preliminary design. This would include the following elements ... 

At this preliminary design stage of the BMN-170, companies and institutions, which can be involved in R D are not specifically defined, nor is the time frame of activities. 

Gerigk, M., 2004. On a risk-based method for safety assessment of a ship in critical conditions at the preliminary design stage. Polish Maritime Research, 11(1 (39)), pp. 8-13. 

These decoupling curves may be of use at a preliminary design stage, when the decision has to be taken whether to proceed with the decoupled or the coupled analysis procedure. At this stage and after the conceptual design of the structure has been concluded, modal analyses of each part of the structure can be carried out. Thus, the R , and R i ratios can be defined so that the... 

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