The effect of system constraint on coolant injection mode of energetic fuel-coolant interactions

The effect of system constraint on FCI energetics when the coolant water jet with various temperatures ranging from 55degC to near saturation was injected into molten thermite at 2500degC (called coolant injection (CI) mode) was experimentally investigated by precisely measuring FCI energetics in the MUSE facility at JAERI. For weak system constraint, the FCI energetics increased as water jet subcooling increases. For strong system constraint, the energetics started decreasing with increasing of jet subcooling. It explains that FCI energetics are governed by the short and long time scale phenomena, enhanced mixing conditions by melt fragmentation and quenching of melt fragments, respectively. (author)