Abstract
Analysis of postulated sodium leak events and resultant pool fire scenarios is essential in the safety evaluation of Sodium-cooled Fast Reactors (SFR). In this connection, numerical studies have been carried out to analyze the spreading characteristics of accidental liquid sodium spills on the cell floor surface under pool fire conditions in SFR systems. The dynamics of sodium pool spreading has been investigated by implementing the integral model, which is commonly employed for liquefied hydrocarbon fuel spills spreading on land or water surface by using the specific characteristics of sodium pool fire. The governing equations have been solved numerically, and the model predictions have been validated with the liquid sodium and water spreading experimental results available in the literature. The present analysis results have shown that the 1-D integral model could fairly predict the overall behaviour of sodium pool spreading, under burning conditions. The validated model has been used to evaluate liquid sodium spreading and pool formation for different leak scenarios under postulated accidental conditions in SFR. The model is useful to simulate the spreading behaviour of sodium spills with the numerical codes developed to evaluate the sodium fire safety.
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