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Proceedings of CHT-17 ICHMT International Symposium on Advances in Computational Heat Transfer
May 28 - June 1, 2017, Napoli, Italy

DOI: 10.1615/ICHMT.2017.CHT-7


ISBN Print: 9781-56700-4618

ISSN: 2578-5486

NUMERICAL STUDY ON THERMAL-HYDRAULIC CHARACTERISTIC DEPENDING ON OUTLET ORIFICE SIZE UNDER ACCIDENT CONDITION IN CFVS

pages 1879-1887
DOI: 10.1615/ICHMT.2017.CHT-7.1990
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RÉSUMÉ

The Containment Filtered Vented System (CFVS) is installed in nuclear power plant to protect the integrity of containment building against the over pressurization and to remove fission products which are in aerosol from the fuel into the containment during severe accidents. For Korea OPR-1000 pressurized water reactor NPP, the CFVS is designed with venturi scrubber's wet type and metallic fiber filter. During the venting process, mixture involved radiative nuclide is quantitatively divided to iodine and aerosol in the throats of venturi scrubber and stored in the scrubbing water pool. But scrubbing water volume is continuously reduced by evaporation due to the high temperature steam and the decay heat due to fission products. Therefore, the orifice design such as size that affects steam flow rate from containment building is important design parameter in CFVS, to maintain performance passively over 72 hours after accident. This study carefully examines the thermal hydraulic characteristic using the FLOWNEX about CFVS design criteria under accident condition according to three different orifice's size: 0.1m, 0.13m and 0.15m. Orifice sizes with 0.15m only met the design criteria because depressurization range in the containment building dropped to 50% of the design pressure within 24 hours and maximum (6m) / minimum (1.4m) water level of scrubbing solution was satisfied during 72 hours accident time.

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