Design of an experimental apparatus for the assessment of Natural convection phenomena in high-temperature pebble bed reactors

Automatic translation: One of the hypothetical air intrusion accidents in the primary circuit of an HTR module the postulated 2F rupture of the connecting pressure vessel. This incident was so far Subject of theoretical calculations, with the help of which statements about the through Natural convection adjusting air mass flow are possible. The results obtained here were the motivation for experiments in which the characteristics of the theoretical curves could be confirmed. In order to be able to make quantitative statements regarding the air mass flow, the graphite burn-off, To be able to achieve the formation of aerosols, etc., an experimental apparatus is required that corresponds to the theory of similarity. In the present work, a model of the HTR module was considered designed for physical similarity. The fill height of the model is from of crucial importance and must in order to ensure that the test results can be transferred to ensure that they correspond to the average core height of the HTR module. In order to validate the existing simulation programs, a test stand is initially planned, which reaches half the fill height of the module. For this a first draft drawing was created, in which the possibility of increasing the tipping height was taken into account from the outset. All employed in this work Considerations and investigations have been made under the premise of compliance with the carried out to allow a conversion of the results obtained later on the test apparatus.