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Thermal Hydraulic Issues of Containment Filtered Venting System for a Long Operating Time
나영수,하광순,박래준,박종화,조송원 한국원자력학회 2014 Nuclear Engineering and Technology Vol.46 No.6
This study investigated the thermal hydraulic issues in the Containment Filtered Venting System (CFVS) for a longoperating time using the MELCOR computer code. The modeling of the CFVS, including the models for pool scrubbingand the filter, was added to the input file for the OPR-1000, and a Station Blackout (SBO) was chosen as an accidentscenario. Although depressurization in the containment building as a primary objective of the CFVS was successful, thedecontamination feature by scrubbing and filtering in the CFVS for a long operating time could fail by the continuousevaporation of the scrubbing solution. After the operation of the CFVS, the atmosphere temperature in the CFVS becameslightly above the water saturation temperature owing to the release of an amount of steam with high temperature fromthe containment building to the scrubbing solution. Reduced pipe diameters at the inlet and outlet of the CFVS vesselmitigated the evaporation of scrubbing water by controlling the amount of high-temperature steam and the water saturationtemperature.
김한철,하광순,김성중,서미로,강상호,이두용,송용만,이종성,임희정,조창석,연제원,김성일,조송원,송진호,류용호 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.8
In order to develop a domestic research roadmap for severe accidents, a special committee was establishedby the Korean Nuclear Society. One of the subcommittees discussed the characteristics and therelevant technical issues in the stages of fission product release and physical forms of radionucliderelease and transport. The group members developed a tree to identify fission product release phenomenaby tracing failures of individual defense-in-depth barriers and added possible countermeasuresagainst failure. For each elemental issue, they searched for technical problems by examining the phenomena,accident management actions, and regulatory aspects relevant to the mitigation features forcontainment, including mitigation strategies against containment bypass accidents. Regulatory concerns,including the source term and the acceptance criteria for radionuclide release, were also considered. They identified further research needs regarding important technical issues based on the degree of thecurrent knowledge level in Korea and in foreign countries, looking at the significance and urgency ofissues and the expected research period required to reach an advanced level of knowledge. As a result,the group identified the 12 most important and urgent issues, most of which were expected to requiremid-term and long-term research periods