2415 デブリ冷却挙動の詳細解析プログラム

概要

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Debris coolability in the lower plenum of the reactor pressure vessel is an important factor for the evaluation of in-vessel debris retention. The debris coolability detailed-analysis program has been developed to predict more mechanistically the safety margin of the present reactor vessels in a severe accident. It calculates debris spreading and cooling through melting and solidification in combination with the temperature distribution of the vessel wall and evaluates the wall failure. It also evaluates the effect of debris coolability by CCFL phenomena or external cooling. The models were verified by comparison between calculation results and separate-effect test data with good agreement. The program provides a good tool for the prediction of the RPV safety margin in a severe accident through the analysis of debris spreading and coolability.
2000-07-31