3 Dimensional temperature-stress analysis of SNR300 shield plug; INTERATOM-PNC Benchmark calculations (PNC side report)

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In order to evaluate the natural convection of Ar gas and structures interaction of the upper closure system of SNR300, the benchmark calculations were carried out at both Interatom GmbH and PNC in the same conditions. Three dimensional temperature distribution analysis of the cover gas and the shield plug, and thermal stress analysis of the shield plug were carried out in the different two cases of sodium temperature, 420C and 556C, using the Interface Program for Fluid and Structures Interaction, "FLUSH", at PNC. And following results were obtained; (1)The surface temperature on the upper plate was in the region of 106.6C176.0C. These rather high values were caused by the ECC (Emergency Cooling Circuit) in the shield plug being performed as the heat source. (2)The maximum circumferential temperature difference was 81.0C, and the maximum thermal stress on the upper plate caused by that ununiform temperature difference was 37.6N/mm. The technical information exchange meeting is going to be held in order to compare the PNC results with the SNR300 experimental data and the calculation results performed by using COMMIX/STINT code at Interaton.