An analysis of plant system dynamics for the MONJU sodium leak accident; Evaluation of the amount of sodium leakage by Super-COPD

Ohtaki, Akira ; not registered

In order to evaluate the pressure history at the leaked position and the amount of sodium leakage regarding the sodium leak accident of MONJU, the plant system dynamics were calculated by Super-COPD. It was estimated from the calculated results that the sodium leakage was halted around 23:28, which was 3 hours and 41 minutes after the initiation. The pressure loss coefficient of the leaked position was evaluated to be 2.16 in two kinds of the water experiments of PNC and of Toshiba-IHI. Using cofficient to the calculated pressure history, the minimum and the maximum leakage rates were evaluated to be 35.5 and 51.9g/sec respectively, and the average rate was 48.9g/sec. Therefore, the total amount of sodium leakage was estimated to be 65038kg.