We investigate steam condensation induced water hammer (CIWH) phenomena andpresent new theoretical results. We use the WAHA3 model based on two-phase flowsix first-order partial differential equations that present one dimensional,surface averaged mass, momentum and energy balances. A second order accuratehigh-resolution shock-capturing numerical scheme was applied with differentkind of limiters in the numerical calculations. The applied two-fluid modelshows some similarities to Relap5 which is widely used in the nuclear industryto simulate nuclear power plant accidents. This model was validated withdifferent CIWH experiments which were performed in the PMK-2 facility, which isa full-pressure thermo-hydraulic model of the nuclear power plant ofVVER-440/312 type in the Energy Research Center of the Hungarian Academy ofSciences in Budapest and in the Rosa facility in Japan. In our recent study weshow the first part of a planned large database which will give us the upperand lower flooding mass flow rates for various pipe geometries where CIWH canhappen. Such a reliable database would be a great help for future reactorconstructions and scheming.
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