• Nuclear Engineering and Technology
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• v.34 no.1
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• pp.68-79
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• 2002

The approach for evaluating the critical heat flux (CHF) margin using the departure from nucleate boiling ratio (DNBR) concept has been widely applied to PWR core design, while DNBR in this approach does not indicate appropriately the CHF margin in terms of the attainable power margin-to-CHF against a reactor core condition. The CHF power margin must be calculated by increasing power until the minimum DNBR reaches a DNBR limit. The Critical Power Ratio (CPR), defined as the ratio of the predicted CHF power to the operating power, is considered more reasonable for indicating the CHF margin and can be calculated by a CPR orrelation based on the heat balance of a test bundle. This approach yields directly the CHF power margin, but the calculated CPR must be corrected to compensate for many local effects of the actual core, which are not considered in the CHF test and analysis. In this paper, correction of the calculated CPR is made so that it may become equal to the DNB overpower margin. Exemplary calculations showed that the correction tends to be increased as power distribution is more distorted, but are not unduly large.

• Journal of the Korean Dietetic Association
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• v.11 no.1
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• pp.21-27
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• 2005

The purpose of this study was to investigate the effects of relating factors on the nutrient intakes in elderly people aged over 85 years residing Namhae Kyungnam. The subject of this study was composed of 24 males and 76 females, the average age being 88.9±4.0 years old. The consumption of energy and most other nutrients was higher in females than males. There were significant positive correlations the education level, pocket money, self-perception of health and happiness, frequency and regularity of meal with nutrient intakes in elderly males and females. The smoking was negatively correlated with protein and niacin intakes(p<0.05). The alcohol drinking and sleeping hours were not significantly correlated with nutrient intakes.