Hydraulic Performance Summary

Entrainment, fraction of liquid on tray 5. Pressure drop 0.0065 0.0048 0.0048 

Head loss under downcomer apron, in clear liquid 0.70 1,02 0.55 

Fraction of tray liquid weeping, Hsieh and McNulty correlation, % 7.3 5.3 5.3 

Fraction of tray liquid weeping, Lockett and Banik correlation (as modified by Colwell and O Bara), % 14 8.4 9.1 

Downcomer seal at turned down conditions (downcomer backup less downcomer clearance, in clear liquid) 3.8 3.0 3.1 

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In addition to the reduction of wave loads and the subsequent reduction of the required size of the concrete superstructure, a substantial improvement of the overall hydraulic performance characteristics is also achieved by using the new HMCB-concept. A summary of the improvements in comparison to the older concept (vertical impermeable superstructure) as obtained from extensive hydraulic model investigations is given in Table 12.1. 

Because the thermal performances of the concepts analyzed were equalized, the disciiminating variable between concepts was the resulting hot leg iimer diameter. Hydraulically, the concept with the largest inner diameter will have the best performance. The internally insulated concept had the largest iimer diameter as a result of having only one insulating layer. A summary of the thermal and hydraulic performance of the analyzed concepts is presented in Table 3. 

The CPT is responsible for integration and implementation of the core design and safety analyses, which includes responsibility for design specifications, verification that fuel received is within specifications, verification that core conditions lie within core design and safety analysis criteria, operating limits, physics ihd thermal-hydraulic data for operational assessment and operational data for core design and safety analyses. The CPT is also responsible for core performance analysis which includes estimated critical position predictions, shutdown reactivity predictions, control rod worth curves, operational anomaly analysis and observed performance summaries. 

Hydraulic analysis of the Aspen Plus simulator produces thermodynamic ideal minimum flow and actual flow curves for rigorous distillation column simulations. These types of calculations are performed for RADFRAC columns. Using the input summary given in problem 4.48 construct the stage-flow curves. Assess the thermodynamic performance of the column. 

In summary, the unit performance test is a strategy used to follow the changes in pounds, BTUs, and hydraulic head. 

In the following paragraphs a brief summary of some of the literamre associated with thermal-hydraulic properties and characteristics and performance, including onset of instability, in NCLs and parallel channels is given. In general, the literature on NCLs and associated physical phenomena and processes is far too enormous to be reviewed in detail here. Instead, many of the reviews already, and especially recently, given will be mentioned along with some of the earlier literature associated with nuclear power systems. 

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