Development of leak detection methods using canister surface temperature change during gas leak from canister- leak evaluation using a 1/4.5-scale cask model -

Abstract

It would be useful for improving the safety of the long-term storage to install a leak detector on a canister in a concrete cask. The phenomenon that the temperature at the bottom of the canister increases and the temperature at the top of the canister decreases during the gas leak from the canister has been confirmed in the previous study. We have proposed sealing performance monitoring by using this phenomenon. To quantitatively evaluate temperature values in the actual canister, we conducted tests and test analysis. We used a 1/4.5-scale cask model designed in consideration of a similarity law of heat transfer. The temperatures obtained in the tests were converted into the actual canister temperatures by dimensional analysis. Also, three leak detection methods were evaluated by using the obtained temperature data. In addition, a computational fluid dynamics calculation for analyzing the phenomenon that the temperatures change before and after the pressure drop was performed.