THEORETICAL MODEL OF PAHR PHENOMENOLOGY - STATE OF THE ART
The theoretical models developed to investigate the coolability processes of volumetric heated and liquid saturated debris are discussed with regard to preboiling and boiling up to extended dryout. The physical bases of each model and their mathematical formulation are described to point out the effect of the The model analysis is complemented by experiments to identify the limits of each approach. Conclusions are drawn and recommendations made: + The thermal properties of the subcooled portion of conductivity corrected to include free convection effects due to the overlying liquid pool. + The Lipinski dryout model appears to be a reliable analytical tool for non channelled deep beds. + Need of relevant modelling of shallow bed is identified. + Dryout models for subcooled channelled bed demonstrate the existence of a critical subcooling value. + In beds with significant radial heat transfer, a time dependent multidimensional model e.g. TORPEDO code, is necessary for analysis of the post dryout evolution.
Bibliographic Reference: EUROPEAN APPLIED RESEARCH REPORTS - NUCLEAR SCIENCE AND TECHNOLOGY SECTION, VOL. 5 (1984), NO. 5, PP. 797-916 EUR 8807 EN).
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Record Number: 1989123046400 / Last updated on: 1987-01-01
Available languages: en