Abstract
Severe accident research in Japan aims at the confirmation of the safety margin, the quantification of the associated risk, and the evaluation of the effectiveness of the accident management measures of nuclear power reactors. Japan Atomic Energy Research Institute has been conducting a wide range of severe accident research both in experiments and analyses, such as ALPHA Program for molten core/coolant interaction, VEGA Program for fission product release from irradiated fuels, WIND Program for revaporization of aerosols and integrity of the piping, and code development activities. Nuclear Power Engineering Corporation is conducting severe accident research focusing on containment integrity related to mitigative accident management measures, such as Containment Integrity Tests and IMPACT super simulator for severe accident analysis. Institute of Nuclear Safety of NUPEC is carrying out a program for developing methodology of level 2 PSA and severe accident analysis. In industries several related activities have been conducted, such as experiments on melt spreading, in-vessel melt coolability and external cooling, and analysis on the effectiveness of the accident management measures. In universities wide variety of basic research activities have been conducted, such as experiments and code developments on fuel-coolant interactions, in-vessel melt behaviors, and fission product behaviors.
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